Fish assemblage structure related to habitat heterogeneity in rocky reefs in the Mexican Pacific coast

Luis H. Escalera-Vázquez1 , Francisco Martínez-Servín1,2 and Daniel Arceo-Carranza3

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Abstract​


EN

One of the major paradigms in ecology is the understanding of processes and patterns related to the structure of biological communities. Reef ecosystems, with their high productivity, habitat heterogeneity, and fish diversity provide a model for studying these processes. We sampled four sites three times during the season associated with the California Current and two times associated with the North Equatorial Current using video-transects on the coast of Zihuatanejo, Guerrero, Mexico to determine the relationship between the habitat characteristics and the structure of the fish assemblage. We recorded a total of 26 families and 54 species and estimated fish richness and abundance. In addition to measuring local water variables such as temperature (°C), salinity (PPT), pH and dissolved oxygen (O2%), we determined habitat heterogeneity by processing photographs of the substrate and calculated rugosity using the tape chain. Oxygen and temperature were the variables associated to sea water conditions that differentiated the sampled sites. The fish community structure presented high correlations with temperature, salinity, and dissolved oxygen, followed by the heterogeneity components such as rugosity and substrate diversity. Our results showed that seasonal changes in water conditions and physical components in the coast of Zihuatanejo promotes changes in the fish community.

Keywords: California current, Ixtapa­-Zihuatanejo bay, North equatorial current, Physical complexity, Seasonal changes.

E

Uno de los principales paradigmas en ecología es el entendimiento de procesos y patrones relacionados con la estructura de las comunidades biológicas. Los ecosistemas de arrecifes, con su alta productividad, heterogeneidad de hábitat y diversidad de peces, proporcionan un modelo para estudiar estos procesos. Muestreamos cuatro sitios tres veces durante la temporada asociada a la Corriente de California y dos veces asociada a la Corriente Ecuatorial Norte utilizando video-transectos en la costa de Zihuatanejo, Guerrero, México para determinar la relación entre las características del hábitat y la estructura de la comunidad de peces. Registramos un total de 26 familias y 54 especies, y estimamos la riqueza y abundancia de peces. Además de medir variables locales del agua como temperatura (°C), salinidad (PPT), pH y oxígeno disuelto (O2%), determinamos la heterogeneidad del hábitat procesando fotografías del sustrato y calculamos la rugosidad usando una cadena. El oxígeno y la temperatura fueron las variables asociadas a las condiciones del agua de mar que diferenciaron los sitios muestreados. La estructura de la comunidad de peces presentó altas correlaciones con la temperatura, salinidad y oxígeno disuelto, seguido por los componentes de la heterogeneidad como rugosidad y diversidad del sustrato. Nuestros resultados mostraron que los cambios estacionales en las condiciones del agua y los componentes físicos en la costa de Zihuatanejo promueven cambios en la estructura de la comunidad de peces.

Palabras clave: Bahíade Ixtapa­-Zihuatanejo, Cambios estacionales, Complejidad física, Corriente de California, Corriente Ecuatorial del Norte.

Introduction​


In the last decades, understanding the effects of heterogeneous habitats loss on living organisms has been a key goal of conservation management to maintain ecological processes and diversity at different scales (e.g., Levey, 1988; Finch, 1989; Greenberg et al., 1995; Willig et al., 2003). Heterogeneity, defined as the relative abundance of different structural components of the habitat (e.g., different kinds and sizes of rocks, vegetation, and sedimentation) is related with species richness and abundance in biological communities, and facilitates species coexistence (MacArthur, Wilson, 1967; McCoy, Bell, 1991).

Marine ecosystems harbor high diversity and different levels of heterogeneity related with high ecological dynamics at different temporal and spatial scales (Bowen et al., 2013). Temporal variation is related to seasonal changes influenced by storms, hurricanes, dry-rain cycles, etc., which in turns modify sea water conditions (Androulidakis et al., 2015). Moreover, in marine ecosystems, reefs are defined as heterogeneous and complex structures providing different types of substrates for the establishment of algae and animals enhancing biological diversity related to productivity and energy flux (Thomson et al., 1979; Chiappa-Carrara et al., 2019). Reefs cover ~284,300 km2 worldwide (1.2% of the continental plateau and 0.09% of the oceanic area; Spalding et al., 2001; Spalding, Brown, 2015) and harbor ~25% of the total marine fauna including one third of the fish species that present specific biotic interactions (Paulay, 1997; García-Charton, Pérez-Ruzafa, 2001). Even though these habitats cover a small area, the ecological functions they provide are also related to maintaining the diversity of hot spots and processes that occur on the mainland (e.g., protection to the coastlines). Furthermore, reef areas are used to promote touristic activities and sustain local fisheries (Moberg, Folke, 1999; Calderón-Aguilera et al., 2017).

In the last two decades, reefs have undergone an increase in the rate of degradation related to overfishing, pollution, habitat modification, introduction of non-native species, and global warming, resulting directly and indirectly in the loss of coral cover and heterogeneity of these habitats (Jackson et al., 2001; Hughes et al., 2017). One important component in the reef functioning are fishes, which in most cases have a high relation and specific biological interactions within these habitats in at least one stage along their life history (Thomson et al., 1979; Arreola-Robles, Elorduy-Garay, 2002). Therefore, many factors are related to the abundance, richness, and structure of the fish assemblages in these marine habitats, such as: temporal variation, habitat heterogeneity, seasonal changes related to ocean currents, shelter availability, feeding resources, foraging areas (Allen, Robertson, 1994; Dominici-Arosemena, Wolff, 2006). Fish assemblage structure and reefs heterogeneity are highly correlated, therefore, the loss of heterogeneity results in low refuge availability and reduction of areas for foraging and reproduction, which in turns increases susceptibility to predation and fisheries (Rogers et al., 2014; Arias-Godínez et al., 2019; Lowe et al., 2019).

In the Mexican Pacific coast, fish diversity is mainly related to the habitat heterogeneityassociated with the topography and historical geology of this coastline (Glynn, Morales, 1997; López-Pérez et al., 2012). This coast is the region with the highest rate of endemism per unit area worldwide with 71% of endemic fish species (Robertson, Allen, 2015). Furthermore, the differences in the reef heterogeneityand seasonal dynamics due to the influence of currents in this area provide an excellent study model to understand and evaluate hypotheses related to habitat heterogeneitythat sustains and promotes high biodiversity.

One of the paradigms in ecology postulates that habitat heterogeneity presents a positive relation with species richness and biodiversity, which in turn triggers temporal and spatial changes in the assemblage structure, allowing coexistence through niche differentiation, and mediating competition and predation pressure by seasonal and daily dynamics (MacArthur, Levins, 1967; MacArthur, Wilson, 1967; Stubbs, Wilson, 2004; Mason et al., 2008; Morin, 2011). In this study, we investigated how the substrate diversity and rugosity as components of habitat heterogeneity, and seasonal changes of the seawater conditions due to marine currents (water temperature, salinity, dissolved oxygen) influence the structure (abundance, richness, and species composition) of the reef fish assemblages in the bays of Ixtapa and Zihuatanejo. We hypothesized that sites with greater habitat heterogeneity and higher seasonal changes in water conditions would harbor a more diverse assemblage in terms of species richness and fish abundance.

Material and methods


Location and site characteristics. The bays of Ixtapa and Zihuatanejo are located at 300 m asl in the coast of the state of Guerrero in the southwest of the Mexican Tropical Pacific coast (Carranza et al., 1975). The shores in these bays present high variation in depth and are constituted of igneous, metamorphic, volcanic and limestones. The constant influence of tropical storms and upwellings causes reef to form mainly on rocks and boulders rather than on coral structures in contrast to the Caribbean reefs (Centeno-García et al., 2008). We sampled four rocky sites: Playa las Gatas (LG; 17°37’24.0”N 101°33’13.3”W) is located south of the bays of Ixtapa and Zihuatanejo, and regarding the short distance to human settlements, presents high impact by direct sewage discharge and tourism activities since 1990. This site presents 6–7 m in depth and reef range 1–2 m high (from the bottom); Zacatoso (ZC; 17°39’16.1”N 101°37’18.4”W) is 1 km east of the shore of the bay of Ixtapa, the reef at this site is found at 5–10 m depth with heights of 4–7 m. This reef presents low degree of deterioration or anthropogenic impact even when is near to touristic resorts and a marine harbor; Caleta de Chon (CH; 17°36’55.1”N 101°33’17.8”W) is located 1.5 km south-east of the Zihuatanejo shore, the reef in this area presents heights of 2–3 m, and is composed mainly by Pocillopora spp. found at 7–8 m depth. This site presents high rates of sedimentation related to coastal erosion since 2010 and; Playa Manzanillo (MZ; 17°37’07.1”N 101°31’21.4”W) is a relatively well-conserved ~40 ha rocky reef covered of corals (1–5 m high) at 2–7 m depth, located 4 km from the bay of Zihuatanejo (Nava, Ramírez-Herrera, 2012; Nava et al., 2014; 2021) (Fig. 1).

FIGURE 1| Geographic location of the Ixtapa and Zihuatanejo bays in the Pacific Coast of Mexico and sampling sites.

The coast of the State of Guerrero belongs to the Eastern Pacific Warm Pool (EPWP), with a continuous flow of warm water from June-December related to the North Equatorial Current (hereafter NEC). The water temperature in this period ranges from 27–30°C and decreases to 19–26°C in January-May due to the presence of the California Current (hereafter CC), which is mainly constituted of cold-water masses from north to south along the Pacific Ocean (Wang, Enfield, 2001; Fiedler, Talley, 2006; Kessler, 2006; Kamikuri et al., 2009). Based on the above mentioned, we performed the field trips to record temporal variations in fish and site characteristics. Two field trips were performed in March and April 2019, and one in February 2020, which corresponded to CC; and two field trips were performed in June and December 2019, which corresponded to NEC.

During each field trip we recorded data on fish assemblages and habitat variables using SCUBA diving techniques. In each field trip, three underwater transects (with three replications) of 30 m length each (3 m wide) were performed in each site perpendicularly to the coastline using a metric rope and an underwater compass. We performed a total of 27 transects in each site under the influence of CC (3 field trips x 3 transects x 3 replications) and 18 for each site under the influence of NEC (2 field trips x 3 transects x 3 replications). All sites had up to 7–10 m in depth, and physicochemical variables of the sea water were recorded along each transect every 10 m, and at three different depths between ~0.5–9 m using a multiparametric sonde (YSI EXO2; YSI Inc., Yellow Springs, OH, U.S.A). The variables were temperature (°C), salinity (PPT), pH and dissolved oxygen (O2%).

Rugosity of the reef bottom at each site was determined by the tape-chain method considering each 30 m transect, following Saleh (1993) and Friedman et al. (2012), where surface rugosity (SR) is the ratio obtained once the chain is placed over the undulating substrate (Dchain) and the total length of the chain (Lchain). The bottom substrate of each site was classified based on the percentage of rock, coral, sand, and rubble (pebbles and dead coral), using a 1 m2 PVC quadrant with an underwater digital camera (GoPro Hero 8 black; aspect ratio of 4:3) fixed in the center facing downward. Photographs of the substrate were taken from 1.5 m at two meters intervals, on each lateral of the 30 m transect (15 photographs on the right side and 15 on the left side). As the photographs presented a concave distortion inherent to the camera lens, image correction was performed using the software Adobe Photoshop CC 2020 (v. 21.0.3 for windows) with the distort tool, using the PVC quadrant as reference; in each image, the four squares were fixed and “distorted” until a straight squared was obtained. Once the images were corrected, we used the software ImageJ (v. 1.52a) to obtain the percentage of substrate type by 1 m2.

We recorded fish abundance and richness for each 30 m transects using the underwater video-transect technique with an underwater digital camera (GoPro Hero 8 black at 1080 p resolution). To standardize the sampling effort and enhance transect homogeneity while recording, the technic proposed by Ramos et al. (2010) and Safuan (2015) was followed. Based on preliminary dives, the recording velocity along the transect was set to ~6 m/min and the wide of the image captured ~3 m. The camera was set to a rig and an underwater compass was attached and used as spirit level to maintain a horizontal line while filming. To maintain the distance between the camera and the bottom (~1.5 m), a rope with a 0.1 kg lead weight was attached to the rig. Video recordings were reviewed five times using the software Adobe Premier Pro 2020, the mean abundance obtained from the five revisions was used in the analyses, and taxonomic and trophic guild identification was following Robertson, Allen (2015).

Data analyses. We performed Principal Component Analysis (PCA) based on correlation matrices to determine environmental gradients and similarities among sites regarding habitat variables. Prior to these analyses multiple correlations were used to identify redundant variables and avoid collinearity. This analysis simplifies multidimensional spaces avoiding loss of information related to the different variables (McCune et al., 2002). The Shannon-Wiener index (H’) was used as measure of substrate diversity (H’=∑pilog2pi; pi = proportion of each substrate type; García-Charton, Pérez-Ruzafa, 2001). Seasonal differences among abiotic variables related to the marine currents (CC vs. NEC) and among sites (CH, LG, ZC and MZ), were tested using one-way analysis of variance (ANOVA). Prior to ANOVA, data represented by proportions were arcsine transformed, continuous variables were Log10 transformed, and normality and homoscedasticity tests were performed (Shapiro-Wilk’s and Bartlett respectively; p ≤ 0.05). For variables that did not meet normality and/or homoscedasticity, non-parametric ANOVAs were considered. For variables with significant differences between seasons and among sites, paired comparisons were performed (e.g., Tukey-Kramer HSD or Wilcoxon test). This was also performed for comparisons among sites regarding the H’ index mentioned above.

Rarefaction analysis was performed (H = 0; endpoint = 1000; p = 0.05) to evaluate sampling effort related to species richness for each site and evenness was obtained based on J = H’/ H’max (Pielou, 1966). Beta diversity was calculated as an indicator of species turnover using the Whittaker index, and analysis of similarity (ANOSIM) based on Bray-Curtis distances with 999 permutations was performed to determine statistical differences (Chao, 1984; Magurran, 1988). Due to statistical differences were present in similarity/dissimilarity matrices (see results), Permutational multivariate analysis of variance (PERMANOVA) using pairwise-adonis test based on Bray-Curtis distances (999 permutations) and Bonferroni correction were performed (github.com/pmartinezarbizu/pairwiseAdonis/blob/master/pairwiseAdonis/R/pairwise.adonis.R). Non-metric multidimensional scaling (NMDS) based on ranked Bray-Curtis distance was used as an ordination procedure to illustrate differences among fish assemblages. This ordination method is not susceptible to problems associated with zero truncation. Simultaneously, the dissimilarity matrices were analyzed with a ANOSIM to determine statistical differences, and pair comparisons were performed using pairwise-adonis as mentioned, and comparisons among the number of fish species by guilds was performed by site and marine current. To elucidate segregation/aggregation patterns we used a null model of co-occurrence for CC and NEC assemblages using the algorithm SIM2 and de C-index in the EcoSimR 1.00 (Gotelli, Ellison, 2013; http://www.uvm.edu/~ngotelli/EcoSim/EcoSim.html). Simulation with SIM2 is based on fixed rows and equiprobable columns and randomizes the occurrence of each species among sites. Meanwhile, the C-index allows comparisons among tests by standardizing the effect score scaling the results in units of standard deviations. Significant differences suggest aggregation of species in the assemblage’s data, while no statistical differences suggest segregation of species (Gotelli, 2000). Finally, to determine the relationship between seawater conditions and heterogeneity components with the fish assemblages, a multiple regression analysis was performed considering the scores obtained in each site for the first three PCA axes, the variables statistically different (e.g., pH, depth, dissolved oxygen, salinity, and temperature) and the assemblage axes values obtained from NMDS. The statistical software used for all the analyses was R (v. 4.1.3, R Development Core Team, 2022), through the libraries R: Vegan, EcoSimR 1.00, iNEXT, rich and PerformanceAnalytics (Rossi, 2011; Gotelli, Ellison, 2013; Hsieh et al., 2020; Peterson, Carl, 2020; Oksanen et al., 2022).

Results​


We found a non-normal distribution for all physicochemical variables of seawater: temperature (W = 0.786, p < 0.001), pH (W = 0.860, p < 0.001), salinity (W = 0.683, p < 0.001), and dissolved oxygen (W = 0.923 p < 0.001) (Shapiro-Wilks test). We found significant differences (p <0.05) between sites considering the changes in seawater conditions related to the effect of the marine currents. In general, CC (December-May) showed significantly lower temperatures compared to NEC (June-November; x2 =335.0; g.l = 7, p < 0.001). The pH values presented small differences between currents, however, these small variations produced significant differences among sites and currents (x2 = 801.1, g.l = 7, p < 0.001). Salinity showed significantly higher values during CC in comparison to NEC (x2 = 3469.4; g.l = 7, p < 0.001). Dissolved oxygen was significantly higher in NEC for all sites, in comparison to CC (x2 = 3188.4, g.l = 7, p < 0.001; Tab. 1). The PCA explained 98% of the variation in the first component, resulting in groups differentiated by seasons related to the influence of the annual ocean currents. Regarding the ordination, the first component (PC1) showed high association with dissolved oxygen, the second component (PC2) with temperature, and the third (PC3) with salinity (Fig. 2; Tab. 2).

TABLE 1 | Sea water conditions (physicochemical variables) of reefs (mean ± standard deviation) with pair comparisons (Kruskal-Wallis p < 0.05; Wilcoxon, W), in sampling sites regarding seasonality related to the California Current (CC) and the North Equatorial Current (NEC). Caleta de chon CC (A), Caleta de Chon NEC (B), Las Gatas CC (C), Las Gatas NEC (D), Manzanillo CC (E), Manzanillo NEC (F), Zacatoso CC (G), Zacatoso NEC (H). Letters in parenthesis represent groups for paired comparisons. No significant differences are represented by letters in the Tukey-HSD column.


Physicochemical Variables of sea water

Caleta de Chon

Las Gatas

Manzanillo

Zacatoso

Tukey-HSD

CC

NEC

CC

NEC

CC

NEC

CC

NEC

(A)

(B)

(C)

(D)

(E)

(F)

(G)

(H)

Temperature (°C)

26.40±0.36

29.70±0.23

26.30±0.59

30.00±0.15

26.40±0.08

29.9±0.042

26.9±0.178

29.8±0.039

AC

pH

8.00±0.03

8.00±0.16

7.90±0.04

7.90±0.02

7.90±0.08

7.9±0.073

7.9±0.051

8±0.063

ACG, BDF

Salinity (ppm)

33.80±0.15

33.4±0.02

33.80±0.16

33.40±0.01

33.80±0.15

33.4±0.006

33.8±0.088

33.3±0.004

EG

Dissolved oxygen (%)

109.40±3.87

113.60±1.07

98.00±7.40

112.20±2.61

94.40±6.68

113.3±2.539

101.7±2.509

106.4±1.069

AF, CG, DF


FIGURE 2| Principal component analysis of (A) sea water conditions and (B) heterogeneity components in sampling sites for the California Current (CC) and North Equatorial Current (NEC). Sampled sites: Caleta de chon (CH), Las Gatas (LG), Manzanillo (MZ), and Zacatoso (ZC). Horizontal and vertical scatter bars represent 95% of confidence interval.

TABLE 2 | Principal component (PC) analysis of variables of reefs in sampling sites. Bold values represent variables highly related with the PC.


Variables

PC1

PC2

PC3

Cumulative variance (%)

0.983

0.998

1

Temperature

0.162

-0.966

0.203

pH

0.003

0.028

0.125

Salinity

-0.028

0.2

0.971

Dissolved Oxygen (%)

0.986

0.164

-0.006

Cumulative variance (%)

0.625

0.842

0.907

Depth

0.018

0.012

-0.147

Percentage of Sand

-0.003

-0.087

0.317

Precentage of Coral

0.085

-0.639

-0.55

Percentage of Rock

-0.753

0.453

-0.351

Percentage of Rubble

0.651

0.608

-0.298

Rugosity

-0.052

-0.057

-0.053


We found normal distribution for depth (W = 0.976, p < 0.268), while the other physical variables and the substrate diversity did not fit the model of normality (rugosity W = 0.964, p = 0.011; sand W = 0.49, p < 0.001; coral W = 0.555, p < 0.001; rock W = 0.804, p < 0.001; rubble W = 0.755, p < 0.001; substrate diversity W = 0.94, p < 0.001). On the other hand, depth, substrate diversity and rugosity showed homoscedasticity (df = 3, p < 0.529; df = 3, p = 0.18; p = 0.101, respectively) unlike sand (df = 3, p < 0.001), coral (df = 3, p < 0.001), rock (df = 3, p < 0.001), and rubble coverage (df = 3, p < 0.001). CH and ZC are significantly different from LG and MZ (df = 3, F = 14.45, p < 0.001) in depth. On the other hand, LG had higher rugosity (x2 = 34.094; df = 3; p <0.001) and less substrate diversity (x2 = 29.494, df = 3; p < 0.001) compared to all other sites. In addition, we found differences between sites: sand (x2 = 17.90, df = 3, p = 0.0004), coral (x2 = 35.09, df = 3, p < 0.001), rock (x2 = 67.82, df = 3, p < 0.001) and rubble (x2 = 32.04, df = 3, p < 0.001; Tab. 3) (Kruskal-Wallis test). PCA results explained 62% of the variation in the first component (PC1), which is highly associated with rock and rubble, the second component (PC2) explains 21% corresponding to coral (Tab. 2). It is worth mentioning that, in the PCA, LG is the most different site related to lower values in variables such as rugosity, sand, coral, rubble and depth, and the highest value of rock percentage (Tab. 3). Additionally, the variation in terms of standard deviations suggests that LG site was the most seasonally stable in most of the variables in comparison to all other sites (Tabs. 1–3; Fig. 2). Rarefaction analysis suggests that based on the sampling technique (video transects), the sites with the highest species richness were LG and ZC in both seasons with CC and NEC, although in the season with CC, the probability of unrecorded species in these sites is high, since rarefaction curves did not reach the asymptote (Fig. 3).

TABLE 3 | Heterogeneity components of reefs (mean ± standard deviation) with pair comparisons (Kruskal-Wallis p < 0.05; Wilcoxon, W), in sampling sites. Letters in parenthesis represent groups for paired comparisons. No significant differences are represented by letters in the Tukey-HSD column.


Heterogeneity components

Caleta de Chon (A)

Las Gatas (B)

Manzanillo (C)

Zacatoso (D)

Wilcoxon-W

Sand %

9.00±0.155

2.90±0.04

17.70±0.203

9.1±0.174

ABC, BD

Coral %

10.40±0.20

0.70±0.01

19.00±0.262

10.5±0.218

AB, AD

Rock %

44.90±0.39

92.70±0.10

25.90±0.312

46±0.406

AC, AD

Rubble %

26.80±0.37

0.00±0.00

30.90±0.366

27.7±0.382

ACD

Rugosity

1.28±0.16

1.50±0.15

1.26±0.10

1.25±0.16

ACD

Depth (m)

8.80±1.51

6.60±2.45

7.10±1.97

10.3±1.788

AD, CB

Substrate diversity (H’)

0.55±0.08

0.49±0.07

0.60±0.063

0.56±0.080

AD, CD


FIGURE 3| Rarefaction curves of species richness for the California Current (CC) and North Equatorial Current (NEC) in the sampled sites: Caleta de chon (CH), Las Gatas (LG), Manzanillo (MZ), and Zacatoso (ZC). Shaded area represents 95% confidence interval.

Based on video transects, a total of 36,282 individuals of seven orders, 26 families, 41 genera and 54 fish species were recorded. The families with the highest number of species were Labridae (9), Pomacentridae (6), and Haemulidae (4). The richness and abundance of the most recorded species was different between season; the most abundant species were Thalassoma lucasanum (Gill, 1862), and Stegastes acapulcoensis (Fowler, 1944) (Tab. S1). In general, the season with CC presented higher richness (54 species) and relative abundance in comparison to NEC (36 species). The current with the highest values of evenness was CC (MZ =1; LG = 0.97; ZC = 0.93, and CH = 0.81) in comparison with NEC (MZ = 0.72; LG = 0.66; ZC = 0.66, and CH = 0.79). Regarding Beta diversity, a turnover of species during both seasons was present, and higher values in CC (CC, R = 0.51, p = 0.001; NEC, R = 0.41, p = 0.001).

The NMDS of the fish assemblages suggested differences between the two seasons: CC presented differences in the composition among sites, since ZC and LG did not present shared species. The fish assemblage obtained in NEC, showed greater variation in LG and ZC (Fig. 4). The similarity analysis (ANOSIM) confirmed statistical differences in the fish assemblages (R = 0.47; p = 0.001), and the paired comparisons obtained from the PERMANOVA showed differences among all assemblages by site and season (p > 0.001). Null model tests indicated segregate patterns of species co-occurrence for CC (C-score = 418.72; p = 0.996), and an aggregate pattern for NEC (C-score = 133.77; p < 0.005). The number of species by guilds showed that the number of carnivorous species were greater in all sites in comparison with herbivores, planktivorous and omnivorous (Fig. S2). Finally, for the relationship between physicochemical variables of sea water in reefs and fish assemblage structure, the results showed that NMDS1 was correlated with depth, NMDS2 with the percentage of rock cover, and NMDS3 presented the highest correlation values with temperature, dissolved oxygen, and salinity (Tab. 4).

FIGURE 4| Non-metric multidimensional scaling for fish assemblage data for the California Current (CC) and North Equatorial Current (NEC) in the sample sites: Caleta de chon (CH), Las Gatas (LG), Manzanillo (MZ), and Zacatoso (ZC). Horizontal and vertical scatter bars represent 95% confidence interval.

TABLE 4 | Pearson correlation coefficients (r values) of variables of reefs, PC scores (CPx-SW = Sea water conditions; CPx-HC = Heterogeneity components of reefs) with NMDS axis.


Variables

MSD1

MDS2

MDS3

Temperature

-0.334

-0.119

-0.608

pH

0.024

-0.128

-0.073

Salinity

0.291

0.101

0.593

Oxígeno disuelto (%)

-0.342

-0.249

-0.523

CP1-SW

-0.343

-0.246

-0.529

CP2-SW

0.059

-0.169

0.257

CP3-SW

-0.334

-0.077

-0.553

Depth

-0.489

-0.038

0.055

Percentage of Sand

0.170

0.194

0.007

Percentage of Coral

0.099

0.265

0.033

Percentage of Rock

0.047

-0.465

-0.040

Percentage of Rubble

-0.129

0.182

-0.003

Rugosity

0.221

-0.264

-0.068

CP1-HC

-0.091

0.383

0.024

CP2-HC

-0.113

-0.286

-0.046

CP3-HC

0.126

0.056

-0.012

Substrate diversity (H’)

-0.026

0.299

0.050


Discussion​


Since habitat heterogeneity has been proposed as an important factor structuring biological communities, in this study we evaluated fish assemblages in four sites exhibiting different habitat characteristics as components of heterogeneity. According to our hypothesis, the results indicated that fish assemblages were more diverse (species richness and abundance) in sites with greater substrate rugosity and higher variation in seawater conditions. Specifically, we found that substrates such as coral and rock were the most important components related to fish assemblage in the bays of Ixtapa-Zihuatanejo, and seawater conditions presented changes influenced by marine currents (CC and NEC) causing seasonal variations in the studied sites, which in turn were related to fish diversity. For instance, the values of evenness and species richness were higher in CC for all sites in comparison with NEC.

Relationship between water conditions and the structure of fish assemblages is reported for marine and freshwater environments (e.g., Brind’Amour et al., 2005; Santos et al., 2017). The seasonal changes we found in fish assemblage were mostly related to temperature, salinity, and dissolved oxygen. In this sense, the Guerrero State presents constant but lower temperatures (~27°C) in CC related to a cold mass of water that converges and is displaced by Trade Winds (Alvarez-Filip et al., 2006; Barjau et al., 2012). In addition, the influence of the CC in the sampled sites also produced an increase in salinity (~34 ppt), primarily related to the mix of the water column with deeper waters during summer and fall; meanwhile pH is reported in ranges of 7.88–8.37, which in most cases are inversely related to the quantity of carbon dioxide (CO2), suggesting that if pH values drop below 7.0, the presence and abundance of low tolerant species will decrease (Fiedler, Talley, 2006; Kessler, 2006; Pérez-Moreno et al., 2016; Portela et al., 2016). The values of dissolved oxygen in CC were lower than those for NEC. This could be attributed to an increase in the primary productivity due to marine upwelling and the trade winds throughout the CC, which produces higher diel variation in the consumption of dissolved oxygen by primary producers reducing oxygen concentration at local scale (Fiedler, Talley, 2006; Chiappa-Carrara et al., 2019; Maske et al., 2019).

We also found differences in fish assemblages among sites. Species richness was greater in ZC, followed by LG, CH and MZ in CC season (Fig. 3). This pattern was similar in NEC season, but in this case MZ species richness was higher than CH. LG was the site with the highest rugosity and percentage of rocks, while ZC was the most heterogeneous site based on percentage of rocks (Tab. 3). In marine ecosystems, habitat heterogeneity presents a positive relationship with fish richness and abundance, promoting biotic interactions such as density-dependent processes (Caley et al., 1996; Hixon, Carr, 1997; Ault, Johnson, 1998; Jones, Syms, 1998; Folpp et al., 2020). For example, the number and size of holes on different substrata are most related to abundance in reefs of the Red Sea (Roberts, Ormond, 1987). Moreover, LG is in a cove, while ZC was deepest site. It has been reported that deep reefs provide refuges for numerous shallow water fishes including many species endemic to these habitats (Lindfield et al., 2016), whereas coves can give protection from strong winds and waves promoting habitat stability at local scale (Bejarano et al., 2017; Graham et al., 1997; Karkarey et al., 2020), which might be important for reproduction and foraging sites. Thus, depth and site exposure to winds and waves might be additional habitat factors contributing to the species richness found in ZC and LG sites.

We recorded 54 species in total by using a video-transect technique, of which 32 were registered in both seasons. Previous studies in the bays of Ixtapa-Zihuatanejo based on visual records reported ~50 conspicuous and 108 cryptic species, including pelagic, residents and transient species of soft bottoms (Valencia-Méndez et al., 2021), while for other sites of the coast of the State of Guerrero (e.g., Bay of Acapulco), 114 species are reported with no mention of whether these were cryptic, conspicuous, or both (Palacios-Salgado et al., 2014). Nevertheless, these studies were conducted over 18 years and along a coastline of ~800 km, respectively.

The video-transects sampling technique is used to obtain data on richness and abundance of different taxonomic groups related to reefs (e.g., benthos: Ramos et al., 2010; fishes: Wartenberg, Booth, 2014), and is considered precise for monitoring conspicuous fishes in terms of richness and abundance, highlighting the implementation in the same sampling area and the experience of the diver (or subaquatic drone operators) to continuously trace the transect with the video-camera in a homogenous manner (Peters, 1991; Rogers, Miller, 2001; Hill, Wilkinson, 2004; Ramos et al., 2010; Wartenberg, Booth, 2015). Based on this and in the number of conspicuous species reported for the bays of Ixtapa-Zihuatanejo, we were able to have a good approximation of most conspicuous species using the video-transect technique, which is supported by the rarefaction results obtained for the sampled sites-currents, for which the asymptote was obtained for most of the sites-currents. We must highlight that differences in the fish species richness reported in different regions of the Mexican-Pacific is related not only with the sampling effort, but also to anomalies occurring every 4–5 years due to El Niño Southern Oscillation (ENSO), which can be a veil to elucidate patterns of changes in species richness at local or regional scale (Fiedler, Talley, 2006; Valencia-Méndez et al., 2021).

The most abundant species for both seasons and sites were T. lucasanum, S. acapulcoensis, Microspathodon dorsalis (Gill, 1862),and Abudefduf troschelii (Gill, 1862). However, our results showed changes in abundance between seasons and among all sites. These species are important biotic components, contributing more than 60% of the total fish biomass in coastal sites for the Tropical Eastern Pacific (Arias­-Godínez et al., 2019). In the Pacific coasts, these species are associated with rocky reefs and have ecological relevance. For example, T. lucasanum feds on eggs and embryos of the other three species mentioned, acting as a density-dependent factor where seasonal changes promote this interaction (Foster, 1987; González-Mendoza et al., 2023). On the other hand, most of the sites (excluding CH) presented lower differences in water conditions in NEC, which suggests a more stable season for reproduction of most of the species recorded in this season (e.g., Mulloidichthys dentatus (Gill, 1862), Epinephelus labriformis (Jenyns, 1840), Caranx caballus Günther, 1868) (Green, McCormick, 2005; Mair et al., 2012; Lucano-Ramírez et al., 2019; Ruiz-Ramírez et al., 2019).

Based on the feeding habits reported in literature for the recorded fish species, the number of carnivorous species was higher in CC in comparison to NEC in all sites. These seasonal changes can be explained by the relation in temperature and marine upwellings in CC, with an increase in primary productivity and prey abundance (Fulton et al., 2005; Dornelas et al., 2006; Tian et al., 2014; Varela et al., 2018). By the other hand, the absence of planktivorous fish species in MZ could be associated to the presence of carnivorous fish species in sites where coral is the dominant substrate, changing the foraging behavior of planktivorous fish (Beukers, Jones, 1998; Bullard, Hay, 2002; Motro et al., 2005). Furthermore, the species co-occurrence model indicated a segregated pattern of species in CC, while an aggregate pattern for NEC. This is explained by changes in abundance and presence of 17 different species exclusive for this season (Alvarez-Filip et al., 2006; Valencia-Méndez et al., 2021). Besides, the beta diversity index showed higher values for CC, indicating high turnover species across sites. This suggests that the fish assemblage can be related with dispersion factors in CC and niche factors in NEC (Fiedler, Philbrick, 1991; Gotelli, 2000; Escalera-Vázquez, Zambrano, 2010).

Our results showed higher abundances of fish associated to changes in water conditions (e.g., increase in temperature), which resulted in low differences in the ordination comparing the same sites in different seasons (Fig. 4). The fish species that changed abundance between season were Halichoeres dispilus (Günther, 1864), Thalassoma lucasanum, Chromis atrilobata (Gill, 1862), and S. acapulcoensis. These species are reported to increase in abundance with temperature, and they can coexist at high abundances by differences in feeding behavior (Dominici-Arosemena, Wolff, 2006; Sánchez-Caballero et al., 2019).

These results provide evidence of the importance of maintaining sites with different substrate composition, depth, and exposure to wind and waves will allow the conservation of fish assemblages dynamics inhabiting seasonal environments in the bays of Ixtapa-Zihuatanejo. The conservation of these sites in the Mexican Tropical Pacific coast lies on the importance as part of a biological corridor, where increasing anthropogenic activities threaten the marine fish diversity.

Acknowledgments​


FMS thanks to Consejo Nacional de Ciencia y Tecnología (CONACyT) for the scholarship number 732692, and the Posgrado Institucional de Maestría en Ciencias Biológicas, Universidad Michoacana de San Nicolás de Hidalgo. We thank Omar Domínguez, Omar Chassin, Luis F. Mendoza and Nancy Calderón for the valuable comments to the manuscript. In accordance with the technique used to obtained species data, individuals were not harmed, collected, or preserved, therefore no special permissions were needed.

References​


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Authors


Luis H. Escalera-Vázquez1 , Francisco Martínez-Servín1,2 and Daniel Arceo-Carranza3

[1]    Laboratorio de Biología Acuática, Facultad de Biología, Universidad Michoacana de San Nicolás de Hidalgo, Santiago Tapia 403, Centro, 58000, Morelia, Michoacán, Mexico. (LHEV) humberto.vazquez@umich.mx (corresponding author), (FMS) francisco.servin@umich.mx.

[2]    Programa Institucional de Maestría en Ciencias Biológicas. Universidad Michoacana de San Nicolás de Hidalgo, Santiago Tapia 403, Centro, 58000, Morelia, Michoacán, Mexico.

[3]    Laboratorio de Ecología, Unidad Multidisciplinaria de Docencia e Investigación Sisal, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de Abrigo s/n, UNAM, 97355 Sisal, Mérida, Yucatán, Mexico. (DAC) darceo@ciencias.unam.mx.

Authors’ Contribution


Luis H. Escalera-Vázquez: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Supervision, Validation, Visualization, Writing-original draft, Writing-review and editing.

Francisco Martínez-Servín: Conceptualization, Data curation, Investigation, Methodology, Project administration, Resources, Writing-original draft.

Daniel Arceo-Carranza: Conceptualization, Methodology, Writing-original draft.

Ethical Statement​


Not applicable.

Competing Interests


The author declares no competing interests.

How to cite this article


Escalera-Vázquez LH, Martínez-Servín F, Arceo-Carranza D. Fish assemblage structure related to habitat heterogeneity in rocky reefs in the Mexican Pacific coast. Neotrop Ichthyol. 2024; 22(2):e230040. https://doi.org/10.1590/1982-0224-2023-0040


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© 2024 The Authors.

Diversity and Distributions Published by SBI

Accepted March 5, 2023 by Fernando Gibran

Submitted April 11, 2023

Epub May 24, 2024