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Mesozooplankton biomass and grazing in the Costa Rica Dome

Title: Mesozooplankton biomass and grazing in the Costa Rica Dome: amplifying variability through the plankton food web.
Name(s): Décima, Moira, author
Landry, Michael R, author
Stukel, Michael R, author
Lopez-Lopez, Lucia, author
Krause, Jeffrey W, author
Type of Resource: text
Genre: Journal Article
Date Issued: 2016-03-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We investigated standing stocks and grazing rates of mesozooplankton assemblages in the Costa Rica Dome (CRD), an open-ocean upwelling ecosystem in the eastern tropical Pacific. While phytoplankton biomass in the CRD is dominated by picophytoplankton (<2-µm cells) with especially high concentrations of spp, we found high mesozooplankton biomass (∼5 g dry weight m) and grazing impact (12-50% integrated water column chlorophyll ), indicative of efficient food web transfer from primary producers to higher levels. In contrast to the relative uniformity in water-column chlorophyll and mesozooplankton biomass, variability in herbivory was substantial, with lower rates in the central dome region and higher rates in areas offset from the dome center. While grazing rates were unrelated to total phytoplankton, correlations with cyanobacteria (negative) and biogenic SiO production (positive) suggest that partitioning of primary production among phytoplankton sizes contributes to the variability observed in mesozooplankton metrics. We propose that advection of upwelled waters away from the dome center is accompanied by changes in mesozooplankton composition and grazing rates, reflecting small changes within the primary producers. Small changes within the phytoplankton community resulting in large changes in the mesozooplankton suggest that the variability in lower trophic level dynamics was effectively amplified through the food web.
Identifier: FSU_pmch_27275033 (IID), 10.1093/plankt/fbv091 (DOI), PMC4889985 (PMCID), 27275033 (RID), 27275033 (EID), fbv091 (PII)
Keywords: OMZ, Efficiency, Food chain, Secondary production, Trophic transfer
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at
Persistent Link to This Record:
Owner Institution: FSU
Is Part Of: Journal of plankton research.
Issue: iss. 2, vol. 38

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Décima, M., Landry, M. R., Stukel, M. R., Lopez-Lopez, L., & Krause, J. W. (2016). Mesozooplankton biomass and grazing in the Costa Rica Dome: amplifying variability through the plankton food web. Journal Of Plankton Research. Retrieved from