Trends in the distribution, population dynamics and reproductive biology of the estuarine cirolanid isopod, Cirolana fluviatilis, were investigated over a 12-month period in the warm–temperate Gamtoos River Estuary, by means of baited traps. Tolerance of adult isopods to combinations of salinity and temperature, and sediment preference, were investigated in the laboratory. Isopods were captured in highest numbers in the lower to middle reaches of the estuary, which appears to be related to a preference by C. fluviatilis for sediment with high mud content. Size-frequency distributions tended to be unimodal, becoming slightly bimodal only after manca release, which occurred predominantly during the warm summer months (December–March). Female C. fluviatilis reached sexual maturity at a length of about 6.0 mm, and males at about 5.2 mm. Fecundity was positively correlated to female body length. Brooding females remained inactive, leading to temporal variations in the male to female ratio.
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.