Distribution of microplankton and fish larvae related to sharp clines in a Patagonian fjord

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Abstract

Vertical distribution of microzooplankton and fish larvae was studied in a Patagonian fjord from Chile. Zooplankton collection, including larvae of the sprat Sprattus fuegensis (Clupeidae) and the lightfish Maurolicus parvipinnis (Sternoptychidae) were collected during a 25 h period inside Steffen fjord (47°S) during November 2008, using stratified sampling of zooplankton, prey field, and CTD casts. Most copepod nauplii, copepodites of Acartia tonsa and large M. parvipinnis larvae were collected in the vicinity of the pycnocline, while larval S. fuegensis did not show a spatial pattern. Therefore, some larval fish species may utilize stable water parcels to increase predator-prey encounter rates.

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Most cited references 37

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Swimming against the flow: a mechanism of zooplankton aggregation.

Peter Franks, Amatzia Genin, Ruth Reef … (2005)

Zooplankton reside in a constantly flowing environment. However, information about their response to ambient flow has remained elusive, because of the difficulties of following the individual motions of these minute, nearly transparent animals in the ocean. Using a three-dimensional acoustic imaging system, we tracked >375,000 zooplankters at two coastal sites in the Red Sea. Resolution of their motion from that of the water showed that the animals effectively maintained their depth by swimming against upwelling and downwelling currents moving at rates of up to tens of body lengths per second, causing their accumulation at frontal zones. This mechanism explains how oceanic fronts become major feeding grounds for predators and targets for fishermen.

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Plankton distribution and ocean dispersal.

Margaret McManus, Lee Woodson (2012)

Plankton are small organisms that dwell in oceans, seas and bodies of fresh water. In this review, we discuss life in the plankton, which involves a balance between the behavioral capabilities of the organism and the characteristics and movement of the water that surrounds it. In order to consider this balance, we discuss how plankton interact with their environment across a range of scales - from the smallest viruses and bacteria to larger phytoplankton and zooplankton. We find that the larger scale distributions of plankton, observed in coastal waters, along continental shelves and in ocean basins, are highly dependent upon the smaller scale interactions between the individual organism and its environment. Further, we discuss how larger scale organism distributions may affect the transport and/or retention of plankton in the ocean environment. The research reviewed here provides a mechanistic understanding of how organism behavior in response to the physical environment produces planktonic aggregations, which has a direct impact on the way marine ecosystems function.

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Foraging behavior can influence dispersal of marine organisms

M. A. McManus, C. B. Woodson (2007)

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Author and article information

Journal

Journal ID (publisher-id): revbiolmar

Title: Revista de biología marina y oceanografía

Abbreviated Title: Rev. biol. mar. oceanogr.

Publisher: Universidad de Valparaíso. Facultad de Ciencias del Mar (Valparaíso, , Chile )

ISSN (Electronic): 0718-1957

Publication date (Print and electronic): August 2013

Volume: 48

Issue: 2

Pages: 401-407

Affiliations

[03] Coquimbo orgnameUniversidad Católica del Norte orgdiv1Facultad de Ciencias del Mar orgdiv2Programa Doctorado en Acuicultura Chile

[04] Concepción orgnameUniversidad de Concepción orgdiv1Facultad de Ciencias Naturales y Oceanográficas orgdiv2Centro FONDAP-COPAS y Departamento de Oceanografía Chile

[01] Viña del Mar orgnameUniversidad de Valparaíso orgdiv1Facultad de Ciencias del Mar y de Recursos Naturales orgdiv2Laboratorio de Ictioplancton (LABITI) Chile mauricio.landaeta@ 123456uv.cl

[02] Barcelona orgnameInstitut de Ciències del Mar (CSIC) Spain