2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 2:30 PM - 2:45 PM | THE ECOLOGICAL ROLE OF AMPHIDROMOUS FISH RECRUITMENT IN CARIBBEAN FRESHWATER–MARINE ECOTONES | 306C
THE ECOLOGICAL ROLE OF AMPHIDROMOUS FISH RECRUITMENT IN CARIBBEAN FRESHWATER–MARINE ECOTONES
Amphidromous fishes are ubiquitous, ecologically important, and culturally significant components of tropical stream communities. In amphidromy, eggs are spawned in freshwater streams, and larvae drift to the ocean. After an oceanic pelagic larval phase, they transition to postlarvae, migrate back into and ascend rivers where they grow to adults and spawn. Postlarval recruitment (i.e., river ingress) of several Caribbean amphidromous fish species occurs as synchronous pulses that are periodic at annual and lunar scales. These mass recruitment events may be a subsidy to freshwater–marine ecotones as they could be a pathway for the transfer of biomass from the ocean to freshwater and estuarine ecosystems. In this study we quantify seasonal and lunar periodicity of recruit abundances to river mouths in Puerto Rico and determine the trophic role of amphidromous mass recruitment events with diet analysis of estuarine and riverine predatory fishes. We also identify the role of amphidromous fish recruitment in nutrient and pollutant dynamics across the freshwater–marine ecotone with stable isotope and contaminant analyses. Our results and conclusions are useful for understanding Caribbean fisheries and aquatic ecosystems.
- C29 Life Histories
- C25 Food Webs
- C02 Fish and Other Aquatic Vertebrates
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Presenters/Authors
Augustin Engman
(), University of Tennessee, gusengman@gmail.com;
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Thomas Kwak
(), U.S. Geological Survey, North Carolina State University, tkwak@ncsu.edu ;
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Jesse Fischer
(), North Carolina State University, jessefischer@gmail.com;
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Greg Cope
(), North Carolina State University, gcope@ncsu.edu;
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