Regional variation in seagrass complexity drives blue crab Callinectes sapidus mortality and growth across the northern Gulf of Mexico

Abstract

Seagrass meadows provide greater predator refuge and resource availability than unvegetated habitats and generally improve the survival and growth rates of associated animals. Few studies, however, have examined how these relationships might vary at a region-wide spatial scale. The blue crab Callinectes sapidus is a commercially important species that uses turtlegrass Thalassia testudinum habitats, but it is unclear if blue crab use of seagrass habitats varies across the northern Gulf of Mexico (GOM), USA. We conducted synoptic predation and growth experiments at 6 turtlegrass-dominated estuaries in the northern GOM to evaluate the role of seagrass structural complexity on juvenile (9.7-44 mm carapace width) blue crab mortality due to predation and growth. Relationships of blue crab predation and growth rate with seagrass shoot density, canopy height, temperature, and seagrass leaf area index (LAI) were evaluated using linear and generalized linear mixed effects models. Mortality rates due to predation (50 ± 9.6% [mean ± SD] crabs eaten, n = 286) showed negative relationships with LAI across the northern GOM. Conversely, mean crab growth rate (0.513 ± 0.317 mm d-1) varied across the northern GOM but was independent of seagrass shoot density or canopy height. We found that: (1) turtlegrass-dominated beds with a greater seagrass LAI provided more effective cover for juvenile blue crabs across the northern GOM, (2) blue crabs across multiple GOM estuaries responded similarly to changes in LAI, and (3) blue crab growth varied across the northern GOM and was likely dependent on regional factors unrelated to structural complexity. This study illustrates the value of conducting synchronous field-based experiments across broad spatial scales to identify regional patterns and the influence of regional versus local drivers.

Crabs ride the tide: incoming tides promote foraging of Giant Mud Crab (Scylla serrata)

“…Our analysis suggests that Giant Mud Crab may be highly adaptable in this regard, since they did not exhibit a clear preference for foraging in a particular habitat. However, overall productivity of the system must also be considered (e.g., [ 90 , 98 ]), and specific habitats (e.g., seagrass) may confer other benefits (e.g., enhanced survival of juveniles) that are not considered in our analysis [ 99 ].…”

Coastal greening of grey infrastructure: an update on the state-of-the-art

“…For example, crevices incorporated into artificial structures can promote oyster recruitment (Strain et al 2018b), with pits and narrow spaces under overhangs, aiding coral recruitment (Strain et al 2018a;Burt and Bartholomew 2019). For fish, increased structural complexity and provision of diversity of refugia can alter biological interactions (predation and competition), leading to greater fish recruitment and survival rates on more complex artificial structures (Morris et al, 2018a;Burt and Bartholomew, 2019;Bartholomew et al, 2022;Komyakova and Swearer, 2019;Komyakova et al, 2021;Hayes et al, 2022). Understanding the extent to which each of these factors drives biodiversityhabitat complexity relationships is critical to understanding the range of environmental conditions across which habitat complexity enhancement will provide biological benefit (e.g.,…”