Life-cycle of the free-living nematode Pontonema vulgare in the White Sea

Malakhov, V.V.

Vestnik Moskovskogo Universiteta, Seriya VI, Biologiya, Pochvovedenie 1: 10-14


Accession: 000129409

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Pontonema vulgare from the White Sea lays its eggs in December, and the development of the 1st and 2nd larval stages takes place at temperatures below zero. At the beginning of the summer the larvae reach the 3rd stage and develop rapidly, the males reaching the 5th stage in September, when the females have only reached the 4th stage. Development is again slowed down by winter conditions. Copulation takes place in June to July. The life-cycle is completed after 2 years, when after a long diapause the eggs are laid in December. This prolonged life-cycle is compared with the shorter one of morphologically similar species from warmer seas and is presumed to be an adaptation of P. vulgare to the severe climate of its habitat. The cytology of P. vulgare ova was also studied and is described. The diploid chromosome number is 32.