Differential grazing on protozoan microplankton by developmental stages of the calanoid copepod Eurytemora affinis Poppe

Merrell, Jeffrey R.; Stoecker, Diane K.

doi:10.1093/plankt/20.2.289

Cited by 74 publications

(46 citation statements)

References 51 publications

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“…If we assume a linear carbon flow from the added glucose (770 mg C L 21 d 21 ) through bacteria, heterotrophic nanoflagellates, and ciliates, ending up in copepod productivity (2 mg C L 21 d 21 ), the average gross growth efficiency would be 23% assuming 100% copepod productivity from added C, or 22% if we assume that 85% of the copepod productivity was based on this pathway. The copepod species E. affinis, which dominated the mesozooplankton assemblage in our experiment, feeds well on both heterotrophic and autotrophic nanoplankton and microplankton (Gasparini and Castel 1997;Merrell and Stoecker 1998;Finlay and Roff 2004). The copepod may even prefer feeding on heterotrophic organisms.…”

Section: Discussionmentioning

confidence: 72%

Efficiency of a phytoplankton‐based and a bacterial‐based food web in a pelagic marine system

Berglund

Müren

Båmstedt

et al. 2007

Limnology & Oceanography

151

138

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The food web efficiency in two contrasting food webs, one phytoplankton based and one bacteria based, was studied in a mesocosm experiment using seawater from the northern Baltic Sea. Organisms included in the experiment were bacteria, phytoplankton, protozoa, and mesozooplankton (copepods). A phytoplankton-based food web was generated by incubating at a high light level with the addition of nitrogen and phosphorus (NP). A bacteria-based food web was created by adding carbon, nitrogen, and phosphorus (CNP) and incubating at a lower light level. In the CNP treatment bacteria dominated the productivity (91%), while in the NP treatment phytoplankton were dominant producers (74%). The phytoplankton community in the NP treatment was dominated by autotrophic nanoflagellates. The food web efficiency, defined as mesozooplankton productivity per basal productivity (phytoplankton + bacteria), was 22% in the phytoplankton-based food web and 2% in the bacteria-based food web. This discrepancy could be explained by 1-2 extra trophic levels in the bacteria-based food web where carbon passed through flagellates and ciliates before reaching mesozooplankton, while in the phytoplankton-based food web there was a direct pathway from phytoplankton to mesozooplankton. The results were supported by stable isotope analysis of mesozooplankton. We propose that climate change, with increased precipitation and river runoff in the Baltic Sea, might favor a bacteria-based food web and thereby reduce pelagic productivity at higher trophic levels.

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Section: Discussionmentioning

confidence: 72%

Efficiency of a phytoplankton‐based and a bacterial‐based food web in a pelagic marine system

Berglund

Müren

Båmstedt

et al. 2007

Limnology & Oceanography

151

138

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“…In San Francisco Bay, Acartia consumed a diverse diet but appeared highly selective for motile prey, especially ciliates and nanoflagellates (Bollens and Penry 2003). Also, developmental stages of E. affinis have exerted higher clearance rates on microzooplankton than on phytoplankton (Merrell and Stoecker 1998). However, Ederington et al (1995) studied the transfer of bacterially derived branched fatty acids to mesozooplankton via ciliates and observed that these compounds can be transferred up the food web without modification.…”

Section: Discussionmentioning

confidence: 99%

Autochthonous and allochthonous contributions to mesozooplankton diet in a tidal river and estuary: Integrating carbon isotope and fatty acid constraints

et al. 2009

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We examined the carbon sources used by bacteria and mesozooplankton in the Scheldt River and estuary (Belgium, The Netherlands) using a combined stable isotope and fatty acid composition approach. Water samples were collected monthly at six stations during 1 yr and analyzed for 13 C of dissolved inorganic carbon, dissolved organic carbon (DOC), and particulate organic carbon (POC). Mesozooplankton was determined up to family, genus, or species level and analyzed for 13 C and fatty acid content. Suspended particles were analyzed for phospholipid fatty acids and their 13 C contents to estimate isotope ratios of phytoplankton groups and heterotrophic bacteria. The carbon isotope signatures of DOC, POC, and bacterial biomass were similar and significantly enriched relative to those of diatoms and green algae, pointing to allochthonous subsidies as an important carbon source for bacteria. The contribution of algae to zooplankton diets as estimated from isotope ratios and fatty acid profiles averaged 41% and 75% respectively, and did not differ significantly among stations, taxa, or age categories. Mesozooplankton relies primarily on grazing on phytoplankton and direct consumption of particulate organic matter. Mesozooplankton appears to receive little of its carbon from DOC via bacteria.

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“…(Gasparini and Castel 1997;Merrell and Stoecker 1998;Gasparini et al 1999;Islam et al 2005). Zooplankton have a small effect on the pool of detritus.…”

Section: Diagram 4-detrital Organic Carbon and Microzooplankton Supplmentioning

confidence: 99%

A Conceptual Model of the Aquatic Food Web of the Upper San Francisco Estuary

Durand¹

2015

SFEWS

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Differential grazing on protozoan microplankton by developmental stages of the calanoid copepod Eurytemora affinis Poppe

Cited by 74 publications

References 51 publications

Efficiency of a phytoplankton‐based and a bacterial‐based food web in a pelagic marine system

Efficiency of a phytoplankton‐based and a bacterial‐based food web in a pelagic marine system

Autochthonous and allochthonous contributions to mesozooplankton diet in a tidal river and estuary: Integrating carbon isotope and fatty acid constraints

A Conceptual Model of the Aquatic Food Web of the Upper San Francisco Estuary

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