Dietary shifts in the copepod Temora longicornis during spring: evidence from stable isotope signatures, fatty acid biomarkers and feeding experiments

Gentsch, Eike; Kreibich, Tobias; Hagen, Wilhelm; Niehoff, Barbara

doi:10.1093/plankt/fbn097

Cited by 50 publications

(36 citation statements)

References 61 publications

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“…Clearance rate of T. turbinata for tested prey items was highest for Thalassiosira spp. as 0.23 ± 0.08 L Temora , showing similar range reported for Temora longicornis (Gentsch et al 2009). During the first experiment, average (± standard deviation) clearance rate on Chaetoceros spp.…”

Section: Methodssupporting

confidence: 82%

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Feeding behavior of the copepod Temora turbinata: clearance rate and prey preference on the diatom and microbial food web components in coastal area

Chang

Doi²,

Nishibe³

et al. 2014

J. Ecol. Environ.

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Feeding behavior of Temora turbinata was investigated through laboratory experiments with special emphasis on its food preference and consequent clearance rate on diatom and microbial components given as common natural food assemblage of coastal area (Uchiumi, Uwa Sea, Japan). Among available prey items, T. turbinata showed the highest clearance rate for Thalassiosira spp. (0.23 ± 0.08 L Temora -1 day ). Bacterial abundances showed no response against 24-h feeding of T. turbinata. Feeding of T. turbinata on heterotrophic nanoflagellates (HNF) was apparent when clearance rates of T. turbinata on diatoms were relatively low, but T. turbinata did not consume HNF as well as ciliates with Thalassiosira spp. of which clearance rate was highest. The results suggest that HNF and ciliates are possible supplementary prey item for T. turbinata, but their contribution as food sources can be limited by the presence of other prey items such as preferable diatom species.

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Section: Methodssupporting

confidence: 82%

“…in the environments. It has been suggested that genus Temora utilizes a broad range of food sources, but Temora often shows dietary shifts from omnivorous to a more herbivorous feeding mode with increase of phytoplankton abundance (Gentsch et al 2009). …”

Section: Methodsmentioning

confidence: 99%

Feeding behavior of the copepod Temora turbinata: clearance rate and prey preference on the diatom and microbial food web components in coastal area

Chang

Doi²,

Nishibe³

et al. 2014

J. Ecol. Environ.

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“…The fast switch from labeled to non-labeled food sources by Temora longicornis after Day 4 was somewhat surprising. Such opportunistic behaviour of copepods has been found over seasonal time-scales (Gentsch et al 2009), but it is remarkable that it can also occur in short time-scale experiments such as this one.…”

Section: Allochthonous and Autochthonous Contributions To Mesozooplanmentioning

confidence: 68%

Plankton dynamics in an estuarine plume: a mesocosm 13C and 15N tracer study

Meersche¹,

Soetaert²,

Middelburg³

2011

Mar. Ecol. Prog. Ser.

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Flows of carbon and nitrogen in a natural phytoplankton assemblage from the plume of the Scheldt estuary were followed during and after a light-induced bloom by measuring changes in concentrations and stable isotope ratios in mesocosms after addition of C-bicarbonate showed a strong coupling between algal primary production and bacterial secondary production, while addition of 13 C-glucose revealed bacteria as a carbon source for eukaryotes. Tracing the 13 C into mesozooplankton, we identified selective grazing on algae during the phytoplankton bloom, transfer of carbon from bacteria to mesozooplankton and opportunistic feeding strategies after the bloom. Nitrogen labeling confirmed carbon labeling findings, identified bacteria rather than mesozooplankton as ammonium regenerators and allowed quantification of nitrification. KEY WORDS: Plankton · Isotope · EstuarineResale or republication not permitted without written consent of the publisher

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“…longicornis is known to be a selective (Koski et al 2005) and omnivorous grazer feeding on phytoplankton and microzooplankton (Kleppel et al 1991;Kleppel 1993;Gentsch et al 2009) of a wide size range in natural assemblages (O'Connors et al 1980;Tackx et al 1989Tackx et al , 1990. Furthermore, field populations of T. longicornis can have a substantial grazing impact on phytoplankton (Dam and Peterson 1993).…”

Section: Microzooplankton and T Longicornis Grazing Impact On The Phmentioning

confidence: 99%

“…Foraging strategies are fundamental to trophic ecological considerations, e.g., trophic cascade effects, and some copepod species, for example, are known to choose specific food actively related to taxonomic differences of the prey (Gentsch et al 2009), prey size (Paffenhöfer 1988), nutrient composition of the prey (Cowles et al 1988) and related to their own life stages (Mauchline 1998). There is also evidence for selective feeding by microzooplankton species (Verity 1991) regarding particle size or taxonomic differences of the prey (Fenchel 1980;Stoecker et al 1981;Jonsson 1986;Hansen 1992;Hamels et al 2004).…”

Section: Introductionmentioning

confidence: 99%

The role of ciliates, heterotrophic dinoflagellates and copepods in structuring spring plankton communities at Helgoland Roads, North Sea

et al. 2011

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Mesocosm experiments coupled with dilution grazing experiments were carried out during the phytoplankton spring bloom 2009. The interactions between phytoplankton, microzooplankton and copepods were investigated using natural plankton communities obtained from Helgoland Roads (54°11.3 0 N; 7°54.0 0 E), North Sea. In the absence of mesozooplankton grazers, the microzooplankton rapidly responded to different prey availabilities; this was most pronounced for ciliates such as strombidiids and strobilids. The occurrence of ciliates was strongly dependent on specific prey and abrupt losses in their relative importance with the disappearance of their prey were observed. Thecate and athecate dinoflagellates had a broader food spectrum and slower reaction times compared with ciliates. In general, high microzooplankton potential grazing impacts with an average consumption of 120% of the phytoplankton production (P p ) were measured. Thus, the decline in phytoplankton biomass could be mainly attributed to an intense grazing by microzooplankton. Copepods were less important phytoplankton grazers consuming on average only 47% of P p . Microzooplankton in turn contributed a substantial part to the copepods' diets especially with decreasing quality of phytoplankton food due to nutrient limitation over the course of the bloom. Copepod grazing rates exceeded microzooplankton growth, suggesting their strong top-down control potential on microzooplankton in the field.Selective grazing by microzooplankton was an important factor for stabilising a bloom of less-preferred diatom species in our mesocosms with specific species (Thalassiosira spp., Rhizosolenia spp. and Chaetoceros spp.) dominating the bloom. This study demonstrates the importance of microzooplankton grazers for structuring and controlling phytoplankton spring blooms in temperate waters and the important role of copepods as top-down regulators of microzooplankton.

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Dietary shifts in the copepod Temora longicornis during spring: evidence from stable isotope signatures, fatty acid biomarkers and feeding experiments

Cited by 50 publications

References 61 publications

Feeding behavior of the copepod Temora turbinata: clearance rate and prey preference on the diatom and microbial food web components in coastal area

Feeding behavior of the copepod Temora turbinata: clearance rate and prey preference on the diatom and microbial food web components in coastal area

Plankton dynamics in an estuarine plume: a mesocosm 13C and 15N tracer study

The role of ciliates, heterotrophic dinoflagellates and copepods in structuring spring plankton communities at Helgoland Roads, North Sea

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