BIOTIC Species Information for Metridium senile
|Researched by||Dr Keith Hiscock & Emily Wilson||Data supplied by||MarLIN|
|Refereed by||This information is not refereed.|
|Reproductive Season||August to September||Reproductive Location||Water column|
|Reproductive frequency||Insufficient information||Regeneration potential||No|
|Life span||11-20 years||Age at reproductive maturity||Insufficient information|
|Generation time||Insufficient information||Fecundity||Insufficient information|
|Egg/propagule size||Insufficient information||Fertilization type||External|
|Reproduction Preferences Additional Information||The Plymouth Marine Fauna (Marine Biological Association, 1957) reports that ova and sperm are produced in August and September at Plymouth. Bull (1939b) records that ova and sperm are given off at intervals throughout the year in north-east England. An account of reproductive cycles in Californian Metridium senile, where spawning occurred in September and October, is given in Bucklin (1982).
Sebens (1985) suggests that the larva is lecithotrophic but has a 'pre-metamorphosis' period of months, a dispersal potential of >10,000m and a colonization rate of 5-10 years.
Metridium senile colonizes areas aggressively. In studies of succession in rock wall communities in the Gulf of Maine, USA, Sebens (1985), the anemone was a late colonizer but grew over earlier colonizers and used specialized 'catch-tentacles' to damage other anemones and soft corals. The presence of such 'catch-tentacles' is also reported for Metridium senile in Britain (Williamson, 1975).
Growth is rapid. Bucklin (1985), working in Britain, found that for Metridium senile f. dianthus fragments and for Metridium senile f. pallidum newly settled individuals, a growth rate of up to 0.6 mm and 0.8 mm in pedal diameter per day occurred respectively. Bucklin (1987a) found that, for Metridium senile from California, individuals showed rapid growth to large sizes when fed at frequent intervals. Mean size grew steadily during the first eight months then levelled off. An increase from 5 cm² pedal disk area to 45 cm² occurred within 12 months. No information on longevity has been found although it would be expected that individuals are long-lived (10 years +).
|Reproduction References||MBA, 1957, Bull, 1939b, Bucklin, 1982, Williams, 1975, Bucklin, 1985, Bucklin, 1987b,|