We investigated the sex differences in the spatiotemporal distribution, body length, and gut contents of adult Neocervinia itoi, the most abundant cerviniid harpacticoid in Sagami Bay, Japan. Two other cerviniid species, Cerviniopsis sp. A and Cervinia bradyi, were also examined for comparison. The density of N. itoi tended to be higher at stations in or below sea bights with steep slopes in the bay, although there was no correlation between their distribution and chloroplastic pigment equivalent (CPE) in the sediment. In general, the sex ratio was strongly biased toward females in this species; the overall mean percentage of males was approximately 23% of adults. The sex ratio seemed to fluctuate temporally, even at the same site, although this fluctuation was not statistically significant. Comparisons of body size and sex ratio between the three species suggest that sampling bias was not the only cause for the observed skewed sex ratio. Distinct sex differences were observed in gut contents of N. itoi. Detritus-like gut contents were clearly observed in the urosomes of almost all females, whereas few males had gut contents. This result suggests that males do not forage during the adult stage. This non-feeding habit of males may result in a shorter lifespan than that of females and may be one cause of the skewed sex ratio. It remains unknown, however, whether this is a general trend among cerviniid species.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.