182.
The microhabitat of
Symbion pandora (Cycliophora) was described by recording the prevalence and distribution of two life cycle stages, namely feeding individuals
and chordoid cysts on the mouth appendages of 65 Norway lobsters. The commensals infested lobsters with a carapace length
>35 mm, while the intensity of the commensals increased with host size up to more than 1,100 feeding individuals and 173 chordoid
cysts. Feeding individuals and chordoid cysts were found on all six pairs of mouth appendages, but were rare on Mxp3. A Kruskal–Wallis
analysis of variance showed that the distribution of the two stages over individual segments deviated significantly from random
expectations (
P<0.001). Feeding individuals densely aggregated on a few medial segments, generally those that are pervaded by suspended food
particles during host feeding. Chordoid cysts, which arise from non-feeding females occurred in low numbers and were more
evenly distributed over the segments, often aggregating on the lateral parts and in the articulations of the segments. Based
on these findings we suggest that the feeding activity of
S. pandora is synchronized with that of the host.
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