Helenius, Laura; Saiz, Enric (2017): Experimental ingestion and clearance rates for copepod Paracartia grani nauplii on microalgal prey in unialgal and bialgal suspensions [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.872504, Supplement to: Helenius, L; Saiz, E (2017): Feeding behaviour of the nauplii of the marine calanoid copepod Paracartia grani Sars: Functional response, prey size spectrum, and effects of the presence of alternative prey. PLoS ONE, 12(3), e0172902, https://doi.org/10.1371/journal.pone.0172902
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Abstract:
Laboratory feeding experiments were conducted to study the functional response and prey size spectrum of the young naupliar stages of the calanoid copepod Paracartia grani Sars. Experiments were conducted on a range of microalgal prey of varying sizes and motility patterns. Significant feeding was found in all prey of a size range of 4.5-19.8 µm, with Holling type III functional responses observed for most prey types. The highest clearance rates occurred when nauplii fed on the dinoflagellate Heterocapsa sp. and the diatom Thalassiosira weissflogii (respectively, 0.61 and 0.70 mL/ind/d), suggesting an optimal prey:predator ratio of 0.09. Additional experiments were conducted to examine the effects of the presence of alternative prey (either Heterocapsa sp. or Gymnodinium litoralis) on the functional response to the haptophyte Isochrysis galbana. In the bialgal mixtures, clearance and ingestion rates of I. galbana along the range of the functional response were significantly reduced as a result of selectivity towards the larger, alternative prey. Paradoxically, relatively large prey trigger a perception response in the nauplii, but most likely such prey cannot be completely ingested and a certain degree of sloppy feeding may occur. Our results are further evidence of the complex prey-specific feeding interactions that are likely to occur in natural assemblages with several available prey types.
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Datasets listed in this publication series
- Helenius, L; Saiz, E (2017): Experimental ingestion and clearance rates for copepod Paracartia grani nauplii on microalgal prey in bialgal (Gymnodinium litoralis, Isochrysis galbana) suspensions. https://doi.org/10.1594/PANGAEA.872501
- Helenius, L; Saiz, E (2017): Experimental ingestion and clearance rates for copepod Paracartia grani nauplii on microalgal prey in bialgal (Heterocapsa sp., Isochrysis galbana) suspensions. https://doi.org/10.1594/PANGAEA.872502
- Helenius, L; Saiz, E (2017): Experimental ingestion and clearance rates for copepod Paracartia grani nauplii on microalgal prey in unialgal suspensions. https://doi.org/10.1594/PANGAEA.872503