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Spatial and Temporal Influences of Nearshore Hydrography on Fish Assemblages Associated with Energy Platforms in the Northern Gulf of Mexico

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Abstract

In 2013–2014, remote video and diver surveys documented fish assemblages around 150 small oil platforms in nearshore federal waters off the entire Louisiana coast (≤ 18 m depth). Results were used to evaluate ecological processes driving differences in fish abundance and assemblages associated with platforms. The nearshore zone was characterized by high spatial and temporal environmental heterogeneity. Surveys documented 55 species of platform-associated fishes. Twenty-nine species were partially or wholly represented by young-of-the-year (YOY) or age 1–2 juveniles, including red, gray, and lane snapper (Lutjanus campechanus, Lutjanus griseus, and Lutjanus synagris), greater amberjack (Seriola dumerili), and gag grouper (Mycteroperca microlepis). Assemblages were compared among three coastal regions with different hydrography due to interactions between river discharge and bathymetry. Assemblage composition near platforms varied in a region × year interaction associated with inter-annual differences in river discharge and coastal distribution of Sargassum drifts. The probability of YOY L. campechanus occurrence increased with bottom DO saturation (1.40–124.3%) from 0.15 to 0.72. The probability of YOY L. synagris and M. microlepis respectively decreased and increased with depth (5.61–16.76 m) from 0.81 to 0.05 and from 0.03 to 0.68. The results show that fish assemblages around platforms in the nearshore zone experienced substantial inter-regional and inter-annual differences that were driven by hydrographic and recruitment variability. Platforms also provided suitable reef habitat for juvenile fishes in areas that experience widespread bottom water hypoxia and large freshwater inflows, highlighting the importance of nearshore platforms as nursery locations for juvenile fishes that represent a variety of early life-history strategies.

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Acknowledgments

We would like to thank both of these organizations for making this research possible, as well as Louisiana State University, and the Louisiana Universities Marine Consortium, where the research took place. Additionally, we thank Bill Childress for his field assistance, Angela Collins for confirming our Atlantic goliath grouper identifications, Joshua Carter and Max Weber for blenny identification assistance, Dr. Kehui (Kevin) Xu for allowing us to use his sediment grain size analyzer, Dr. Carey Gelpi for keeping us briefed on coast-wide conditions throughout the study years, and Dr. Nan Walker and Alaric Haag for the assistance of the LSU Earth Scan Laboratory.

Funding

Funding for this project was provided by the Bureau of Ocean Energy Management (project no. M12AC00015) and supported by a match from the Louisiana Department of Wildlife and Fisheries for a companion project.

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Correspondence to Ryan T. Munnelly.

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Munnelly, R.T., Reeves, D.B., Chesney, E.J. et al. Spatial and Temporal Influences of Nearshore Hydrography on Fish Assemblages Associated with Energy Platforms in the Northern Gulf of Mexico. Estuaries and Coasts 44, 269–285 (2021). https://doi.org/10.1007/s12237-020-00772-7

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