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Life cycles, breeding periods and vertical distribution of Idotea granulosa Rathke and I. pelagica Leach (Crustacea, Isopoda) on Icelandic shores
Leifsson, B.R. (1998). Life cycles, breeding periods and vertical distribution of Idotea granulosa Rathke and I. pelagica Leach (Crustacea, Isopoda) on Icelandic shores. Sarsia 83: 1-13
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827, more
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Keyword
    Marine

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  • Leifsson, B.R.

Abstract
    The life cycles, breeding periods and vertical distribution of two species of Idotea from three intertidal localities in Iceland were investigated over a period of two years. Two of the localities (Straumsvík, Háanef) were in southwestern Iceland while one (Húsavík) was in northern Iceland where sea temperatures are considerably lower. The vertical distribution was widest during the summer for both species. During summer, I. granulosa had a wider distribution at Straumsvík than at Húsavík, while the more southern I. pelagica was restricted to the lowermost part of the shore. During winter at Straumsvík I. granulosa receded to the lowermost part of the shore and disappeared altogether from the intertidal zone at Húsavík. I. pelagica at Háanef also disappeared from the shore during winter but for a considerably longer period. Oostegites started to develop on females in late winter and the juveniles were mainly released in the autumn in all cases. Females of I. granulosa and I. pelagica in the southern region released their broods when one year old and lived to a maximum age of approximately 15 months (I. pelagica) or 16-18 months (I. granulosa). Females of I. granulosa in the North, however, did not release their broods until almost two years old after which they soon disappeared. The present results fit well with observations elsewhere for Idotea spp. in that the animals seem to breed less frequently as the temperature decreases. The breeding period also becomes shorter and more confined to the summer at lower temperatures.

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