Seasonal fish community variation in headwater mangrove creeks in the southwestern Everglades: an examination of their role as dry-down refuges

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Tables

Table 2. Summary of results of nested, repeated-measures ANOVA and ANCOVAs testing the effects of season, region, creek, placement (for minnow traps only), and salinity on catch-per-unit-effort (CPUE) from electrofishing, gill nets, and minnow traps.

Table 3. Summary of ANOSIM results testing variation in fish-community structure as a function of region, season, and gear in electrofishing, gill net, and minnow trap samples.

Table 4. Summary of nested, repeated-measures ANCOVA and ANOVA analyses testing variation in the proportion of CPUE that is composed of freshwater taxa (FW in Table 1) per sample as a function of region, season, and placement (for minnow traps only) in electrofishing and minnow trap samples.

Figures

Figure 2. (A) Mean daily salinity and (B) water levels collected by the nearest four NPS monitoring stations to study headwater creeks.

Figure 3. Salinities over the three sampling seasons in the two study regions: the North and Watson rivers and Rookery Branch.

Figure 4. (A) Electrofishing and (B) gill net catch-per-unit effort (CPUE) over the three sampling seasons in the two study regions.

Figure 5. CPUE in minnow traps shown separately by trap placement: (A) top vs (B) bottom of water column) over the three sampling seasons and in the two study regions.

Figure 6. Estimates of large fish abundance (CPUE) in electrofishing samples (Log-transformed) plotted as a function of salinity.

Figure 7. Two-dimensional non-metric MDS ordinations illustrating large fish (50-750 mm SL) community structure in (A) electrofishing samples, (B) gill net samples, and (C) gill net vs electrofishing samples based on Bray-Curtis similarities of log-transformed, standardized CPUE.

Figure 8. Average proportion of (A) electrofishing and (B) minnow trap CPUE composed of freshwater species over the three sampling seasons in the two study regions.

Figure 9. Two-dimensional non-metric MDS ordinations illustrating variation in small fish community structure (< 5 cm SL): (A) among seasons and sites and (B) as a function of trap placement.