Feeding ecology of Apocyclops procerus (Copepoda, Cyclopoida) under experimental conditions

in Crustaceana
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Copepods are key links between primary producers and higher pelagics. We investigated, for the first time, under laboratory conditions, some aspects of the reproductive behaviour and feeding preferences of Apocyclops procerus (Copepoda: Cyclopoida) under different conditions of salinity and food supply. This is also its first record for Pernambuco (NE Brazil). The females carry their eggs until their eclosion and present several cycles of egg production without being further fecundated. Egg production and adult life span were not affected by differences in salinity or food supply. Offspring predation was also observed. From the three microalgae species offered to A. procerus individuals, Thalassiosira weissflogii, Chaetoceros muelleri (Ochrophyta) and Isochrysis galbana (Haptophyta), the small round-shaped I. galbana was preferred over the large and spiny diatoms, in spite of its lower nutritional value. The high salinity tolerance and apparently omnivorous feeding habits of A. procerus may enable it to predominate in estuarine waters.


International Journal of Crustacean Research



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  • Map of the study area where the Apocyclops procerus (Herbst, 1955) specimens were collected. The asterisk marks the sampling point.

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  • Duration of Apocyclops procerus (Herbst, 1955) egg production cycles (white bars) and inter-production cycles (black bars) for each female observed (without further fecundation) at both salinities (26 and 36).

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  • Densities (ind./ml) of the microalgae species used in the grazing experiments during the sampled intervals (0, 30, 60 and 120 min) at both salinities (26 and 36) in the absence (control) and presence (treatment) of grazers (Apocyclops procerus (Herbst, 1955)): a-b, Thalassiosira weissflogii (Grunow) G. Fryxell & Hasle, 1977 at both salinities; c-d, Chaetoceros muelleri Lemmermann, 1898 at both salinities; e, Isochrysis galbana Parke, 1949 at S=26. Asterisks indicate significant differences between control and treatment at each sampling period: p<0.05, ∗∗p<0.01 and ∗∗∗p<0.001.

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