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Migration and Reproduction of the Wood-Boring Isopod, Limnoria, in Southampton Water

S. K. Eltringham and A. R. Hockley
Limnology and Oceanography
Vol. 6, No. 4 (Oct., 1961), pp. 467-482
Stable URL: http://www.jstor.org/stable/2832524
Page Count: 16
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Migration and Reproduction of the Wood-Boring Isopod, Limnoria, in Southampton Water
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Abstract

Three species of Limnoria occur together in Southampton Water. Migration began at a water temperature rising through $10^\circ C$ in L. quadripunctata and L. lignorum and through $15^\circ C$ in L. tripunctata. Migratory activity followed the water temperature in L. tripunctata but declined in L. lignorum before the highest temperatures were reached. The migratory behavior of L. quadripunctata resembled that of L. trupunctata at one site and that of L. lingnorum at another. Overcrowding as a cause of migration was not supported. Migration was confined to large, sexually mature adults, excluding gravid females. The first migrants were predominantly male, and in L. lignorum about twice as many males as females migrated. Reproduction showed a marked increase in the summer, beginning at a water temperature of $10^\circ C$ in L. quadripunctata and L. lignorum and of $12^\circ C$ in L. tripunctata. L. quadripunctata differed from other species in being the only one in which the average brood size of post-migrants was significantly greater than that of non-migrants, and in which a significant increase in brood size with body size occurred. No seasonal change in brood size was demonstrated in any species. Widely separated developmental stages were frequently found in the same brood. The duration of the egg stage was longer than that of the embryo which in turn exceeded that of the larval stage.

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