Feeding interactions of the copepods Eurytemora affinis and Acartia bifilosa with the cyanobacteria Nodularia sp.

Engström, Jonna; Koski, Marja; Viitasalo, Markku; Reinikainen, Marko; Repka, Sari; Sivonen, Kaarina

doi:10.1093/plankt/22.7.1403

Cited by 88 publications

(65 citation statements)

References 21 publications

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“…Toxic secondary metabolites, which vary from one cyanobacterial strain to another, may act as speciesspecific cues for copepod feeding selection (Kurmayer and Juttner 1999;Engstrom et al 2000). The calanoid copepod Diaptomus birgei not only selected strongly against a toxic Oscillatoria and showed high feeding rates on a nontoxic one, but also positively selected dead Microcystis over Chlamydomonas and strongly selected against living Microcystis (DeMott and Moxter 1991).…”

Section: Discussionmentioning

confidence: 99%

“…For example, while some copepods reject all Nodularia strains based on a general 'Nodularia cue,' others will ingest nodularin (toxin) lacking strains, which still cause reduced survival due the ingestion of other cyanobacterial toxins (Engstrom et al 2000). Thus, strain-specific selection for cyanobacteria can cause copepod mortality if the bad taste cue does not prevent the ingestion of toxic cells (Engstrom et al 2000;Ger et al 2010b). For calanoid copepods, tolerance to cyanobacteria should be related to the efficiency of selective feeding, the effectiveness of recognition cues for toxicity, and inversely related to the ingestion of toxic cells.…”

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confidence: 99%

“…Using paired food types that combine 'good food' with cyanobacterial strains of varying toxicity but similar morphology has been an effective method to compare species-specific cues and the efficiency of feeding selection in zooplankton (Engstrom et al 2000;Lü rling 2003). Methods typically involve the use of radio-labeled alga as a direct measurement of ingestion, or indirect estimates based on the disappearance of suspended alga (Wilson et al 2006).…”

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confidence: 99%

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Consequences of acclimation to Microcystis on the selective feeding behavior of the calanoid copepod Eudiaptomus gracilis

Ger

Panosso

Lürling

2011

Limnology & Oceanography

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We tested the hypothesis that calanoid copepods would adapt to extended periods of Microcystis exposure by increasing selective feeding on alternative food. Copepod (Eudiaptomus gracilis) clearance rates were compared before and after a 5-d acclimation to Microcystis aeruginosa using paired food mixtures containing a microcystinproducing (MC+) or -lacking (MC2) strain and the green alga Chlamydomonas reinhardtii. Acclimation reduced the ingestion of Microcystis, increased ingestion of Chlamydomonas, and subsequently increased feeding selectivity. The effect of acclimation was more pronounced for food mixtures with MC+ Microcystis, suggesting that E. gracilis uses a strain-specific cue related to microcystin or microcystin itself to avoid harmful food. The results indicate that exposure to sublethal abundances of Microcystis may increase copepod tolerance to blooms, given sufficient alternative food. Zooplankton grazing behavior should, therefore, be viewed as flexible and adaptive to extended periods of cyanobacteria blooms.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Consequences of acclimation to Microcystis on the selective feeding behavior of the calanoid copepod Eudiaptomus gracilis

Ger

Panosso

Lürling

2011

Limnology & Oceanography

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“…Nevertheless, several experimental studies have shown that crustaceans are able to survive and grow on Baltic cyanobacteria (Engströ m et al 2000;Koski et al 2002). Meiofauna as well as other benthic fauna living below the photic zone are highly dependent on the inputs of organic matter from the photic zone (Ó lafsson and Elmgren 1997) and are probably food limited for most of the year (Rudnick 1989).…”

Section: Discussionmentioning

confidence: 99%

“…spumigena produces the hepatotoxin nodularin, a toxin closely related to the microcystins that can cause toxic effects in vertebrates at low levels of exposure (Sivonen and Jones 1999). Although the effects of feeding on N. spumigena and consequent exposure to nodularin have been documented for the zooplankton community (Engströ m et al 2000;Engströ m-Ö st et al 2002) and to a lesser extent in some benthic fish and bivalves (Lehtonen et al 2003;Sipiä et al 2006), their effects on benthic meiofauna are unknown, and meiofaunal feeding on N. spumigena has not yet been studied. On the other hand, even though it can produce neurotoxins in freshwater environments, Aphanizomenon sp.…”

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confidence: 99%

Settling blooms of filamentous cyanobacteria as food for meiofauna assemblages

Nascimento

Karlson

Elmgren

2008

Limnology & Oceanography

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Summer blooms of filamentous nitrogen-fixing cyanobacteria in the Baltic Sea are normally dominated by Aphanizomenon sp. and the toxin-producing Nodularia spumigena. In a 2-week laboratory experiment, we followed the uptake by representative benthic meiofauna species of 14 C-labeled organic carbon from blooms, each dominated by one of these cyanobacteria. Natural bloom material was collected and labeled by incubation with NaH 14 CO 3 . Uptake of cyanobacterial carbon was recorded for the major meiofauna taxa living in the firstcentimeter layer, namely ostracods, harpacticoids, and nematodes. The uptake rates were within the range found for diatoms in other studies, indicating that cyanobacteria may be an important food resource for the meiobenthos. The uptake of cyanobacterial carbon varied significantly among species, even within the same class. The ostracod Candona neglecta showed the highest uptake values, whereas two other ostracod species took up very little of the label. There was no significant difference in utilization of carbon from Aphanizomenon sp. and N. spumigena and no reduction in the abundance of the meiofaunal taxa analyzed compared to unexposed controls, indicating that Baltic meiofaunal assemblages in general experience no mortality when exposed to settled cyanobacteria, even the hepatotoxic N. spumigena.

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Strategies of amino acid supply in mesozooplankton during cyanobacteria blooms: a stable nitrogen isotope approach

et al. 2018

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Knowledge of how zooplankton can utilize cyanobacteria to sustain their nitrogen (N) demand for essential compounds like amino acids (AAs) is a key to predicting responses of higher trophic levels in terms of production and food web structure to future enhanced water column stratification. We explored the natural abundances of bulk N and AA‐specific nitrogen isotopes (δ15N) in particulate organic matter and mesozooplankton size‐fraction samples from three vertically separated water bodies in the central Baltic Sea during two summertime cyanobacteria blooms. The combination of plankton community and isotope data together with environmental variables helped to identify a mechanism of diazotrophic AA supply (synthesized during N2 fixation) for mesozooplankton, that largely depended on the sea surface temperature which regulated the access to the diazotrophic N‐based food web in the surface water (SW). We found that in the warmer summer, thermophilic cladocerans (e.g., Bosmina spp.) benefited most from diazotrophic AAs in the SW (19.8°C), while only in the colder summer, temperate copepods (e.g., Temora longicornis) ascended from the subjacent winter water into the SW (16.2°C) and incorporated diazotrophic AAs. Trophic position estimates based on the phenylalanine and glutamic acid δ15N signatures revealed that the diazotrophic AA supply into mesozooplankton was mainly indirect via feeding on mixo‐ and heterotrophic diets. Significantly enriched δ15N signatures in phenylalanine in the deep mesozooplankton (mainly copepods of Pseudo‐ and Paracalanus spp.) from the bottom water (BW) that was a region of the suboxic zone point to a reliance on a local food web. Mesozooplankton in the BW was feeding on diets of heterotrophic origin and probably profited from the heterotrophic re‐synthesis of AAs originating from sinking organic matter, as well as from the indirect incorporation of de novo synthesized AAs that most likely originated from chemoautotrophic bacteria or archaea communities in the suboxic zone. Our findings suggest that indirect feeding on diazotrophs and chemoautotrophs will be principal ways of amino acid supply for zooplankton in future enhanced stratified aquatic systems. Only a relatively small increase in temperature may restrict temperate key species from diazotrophic N‐based food webs in the mixed layer.

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Feeding interactions of the copepods Eurytemora affinis and Acartia bifilosa with the cyanobacteria Nodularia sp.

Cited by 88 publications

References 21 publications

Consequences of acclimation to Microcystis on the selective feeding behavior of the calanoid copepod Eudiaptomus gracilis

Consequences of acclimation to Microcystis on the selective feeding behavior of the calanoid copepod Eudiaptomus gracilis

Settling blooms of filamentous cyanobacteria as food for meiofauna assemblages

Strategies of amino acid supply in mesozooplankton during cyanobacteria blooms: a stable nitrogen isotope approach

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