| ingestion, faecal pellet and egg production rates of calanus helgolandicus feeding coccolithophorid versus non-coccolithophorid diets. | ingestion rates, faecal pellet and egg production were obtained in laboratory experiments with females of the copepod calanus helgolandicus collected from the english channel in november 1994. five different algal monocultures were used as food: prorocentrum micans (30 µm esd), thalassiosira weissflogii (13 µm esd), dunaliella tertiolecta (7 µm esd), emiliania huxleyi (5 µm esd) and coccolithus pelagicus (14 µm esd). results obtained suggest the low ingestion efficiency of the copepod when feedi ... | 2000 | 10771305 |
| temporal transcription of two antennapedia class homeobox genes in the marine copepod calanus helgolandicus. | dna sequence information has been obtained for 2 genes implicated in playing critical roles in copepod development. the first ( cal-antp) was obtained by screening a calanus helgolandicus genomic library. it shows homology to antennapedia homeobox genes from a number of organisms including the centipede (76.8% over 250 bp) and the brine shrimp (75.5% over 220 bp). a second sequence (hox 12) was obtained through reverse transcription polymerase chain reaction (pcr) of a solid-phase cdna library c ... | 2003 | 14583812 |
| wasp-waist interactions in the north sea ecosystem. | in a "wasp-waist" ecosystem, an intermediate trophic level is expected to control the abundance of predators through a bottom-up interaction and the abundance of prey through a top-down interaction. previous studies suggest that the north sea is mainly governed by bottom-up interactions driven by climate perturbations. however, few studies have investigated the importance of the intermediate trophic level occupied by small pelagic fishes. | 2011 | 21829494 |
| a molecular and co-evolutionary context for grazer induced toxin production in alexandrium tamarense. | marine dinoflagellates of the genus alexandrium are the proximal source of neurotoxins associated with paralytic shellfish poisoning. the production of these toxins, the toxin biosynthesis and, thus, the cellular toxicity can be influenced by abiotic and biotic factors. there is, however, a lack of substantial evidence concerning the toxins' ecological function such as grazing defense. waterborne cues from copepods have been previously found to induce a species-specific increase in toxin content ... | 2010 | 21124775 |
| presence of two suctorian ciliate species of the genera acineta and pelagacineta, epibionts on marine copepod crustaceans. | acineta arcachoniensis sp. nov., a new species of protist suctorian epibiont on the copepod chiridius gracilis is described. the individuals show two well-developed actinophores, with two fascicles of capitate tentacles, an irregular nucleus, a cup-shaped lorica and a short stalk. reproduction of a. arcachoniensis is by endogenous budding. the suctorians are located on the base of the antennae, the final abdominal segments or on the last pereiopod pair of the copepod. in addition, a new registra ... | 2000 | 11086709 |