Distribution and delivery of meroplanktonic larvae in the Bay of Todos Santos: the role of internal tidal waves
Marine invertebrate larvae accumulate at different distances from the coast due to their behavior, ontogenic stage, habitat and the variability of physical mechanisms on the shelf. This study represents one of the first efforts to understand the role of internal tidal waves along the last part of th...
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| Tipo de documento: | tese |
| Estado: | Versão publicada |
| Data de publicação: | 2019 |
| País: | México |
| Recursos: | Centro de Investigación Científica y de Educación Superior de Ensenada |
| Repositório: | Repositorio Institucional CICESE |
| Idioma: | inglês |
| OAI Identifier: | oai:cicese.repositorioinstitucional.mx:1007/2989 |
| Acesso em linha: | http://cicese.repositorioinstitucional.mx/jspui/handle/1007/2989 |
| Access Level: | Acceso aberto |
| Palavra-chave: | info:eu-repo/classification/Autor/zooplankton, larval supply, internal tidal bore, onshore winds, rocky shore info:eu-repo/classification/Autor/zooplancton, aporte larval, macareo interno de marea, vientos hacia costa, costa rocosa info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/25 info:eu-repo/classification/cti/2510 info:eu-repo/classification/cti/251001 |
| Resumo: | Marine invertebrate larvae accumulate at different distances from the coast due to their behavior, ontogenic stage, habitat and the variability of physical mechanisms on the shelf. This study represents one of the first efforts to understand the role of internal tidal waves along the last part of the journey that larvae must undergo to arrive at their settlement site, focusing on the 2 km just before reaching the shore. We evaluated high-frequency changes (hourly) in the abundance and vertical variability of target meroplankters (gastropods, oysters, barnacles, and bryozoans) using a cross-shore array of three stations in the coastal ocean (2 km, 1.3 km and 10 m from shore) during a period of strong internal tidal forcing in summer, when many larvae settle and recruit in this area. Concurrent measurements of temperature, currents, and winds helped to identify the mechanisms occurring while meroplankton abundance was measured. Semidiurnal internal waves dominated the temperature and current fields, especially from the midwater to the bottom, and were most likely responsible for aggregating organisms at different sites depending on their habitat preferences. Cyphonautes were concentrated at depth during the warm phase of the internal tide only at 2 km from shore, where they were most abundant. At 1.3 km from shore, gastropods were more concentrated at depth during the cold phase of the internal tidal bore, where they were most abundant. Gastropods appeared to be delivered to coast by an interaction between changes in temperature related to breaking internal tidal waves and onshore winds, showing for the first time an interaction between both forcing factors as a mechanism of delivery. Barnacle cyprids were found only at the subtidal site and peaks in abundance were related to breaking internal tidal waves at the shore. The results of this thesis further emphasize the complicated impact that internal waves might have on structuring intertidal communities. |
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