BIOTIC Species Information for Corophium volutator
|Researched by||Ken Neal & Penny Avant||Data supplied by||MarLIN|
|Refereed by||This information is not refereed.|
||Developmental mechanism||Direct Development
|Reproductive Season||See additional information||Reproductive Location||Adult burrow|
|Reproductive frequency||Annual episodic||Regeneration potential||No|
|Life span||<1 year||Age at reproductive maturity||<1 year|
|Generation time||<1 year||Fecundity||To ca 50|
|Egg/propagule size||Insufficient information||Fertilization type||Internal|
|Reproduction Preferences Additional Information||Reproductive season
Corophium volutator lives for a maximum of one year (Hughes, 1988) and females can have 2-4 broods in a lifetime (Conradi & Depledge, 1999). Populations in southerly areas such as the Dovey Estuary, Wales or Starrs Point, Nova Scotia have two reproductive episodes per year. Those populations in colder, more northerly areas such as the Ythan Estuary, Scotland or in the Baltic Sea only have one (Wilson & Parker, 1996; Table 1). Gravid females first appear in March with peak numbers occurring in May. These females, having successfully over-wintered and reproduced, die out during June. The juveniles born in May undergo rapid growth and maturation to reproduce from July to September and generate the next over wintering population (Fish & Mills, 1979).
Female Corophium volutator require the presence of a male to mate and must moult to become ovigerous (McCurdy et al., 2000). Males search for females over the mud at low tide on spring tides (Fish & Mills, 1979) and enter burrows of mature females. Fertilization is internal by copulation and the female has to moult before the male can copulate, often leading to males guarding and fighting over females (Forbes et al., 1996). Fertilized eggs are deposited in a ventral thoracic brood pouch where the embryos develop over the following 14 days and are released as juveniles on the spring tide (Fish & Mills, 1979). Brood sizes are 20 -52 embryos (Fish & Mills, 1979; Jensen & Kristensen, 1990).
Populations worldwide generally have a 1:1 sex ratio, but in the Bay of Fundy, the sex ratio was highly skewed towards females. Only 16 - 36% were male and this was not due to higher predation pressure on males by wading birds (Schneider et al., 1994).
|Reproduction References||Hughes, 1988, Jensen & Kristensen, 1990, Schneider et al., 1994, Wilson & Parker, 1996, Forbes et al., 1996, Fish & Mills, 1979, Conradi & Depeledge, 1999, McCurdy et al., 2000, Jones and Frid, 2009,|