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Vertical distribution of pelagic larvae of some marine gastropod species at desalination and temperature rise on the surface of water column

Byulleten' Dal'nevostochnogo Malakologicheskogo Obshchestva 10: 88-101
Vertical distribution of pelagic larvae of some marine gastropod species at desalination and temperature rise on the surface of water column
Vertical distribution of pelagic larvae of some marine gastropod species at the change of temperature and salinity on the surface of water column was investigated. It was shown that in stratified by tempera water column larval veligers, retaining the ability for active movement up and down, do not distribute throughout the entire water column, but concentrate in water layers with certain temperature conditions. Investigation of temperature effect on embryos development in layings, coming out of layings, subsequent survival and growth of larvae showed that temperatures, optimal for these developmental stages, and temperatures, typical for water layers, in which larvae concentrate in stratified waters coincide. Moving towards the surface in stratified water column, larval veligers reached layers with certain salinity and either did not enter these layers, or having entered them, did not stay too long in them and left for the lower layers with higher salinity. We showed that larvae left those layers which salinity produced an oppressive effect on their development and growth. The work provides a general conclusion that gastropod larvae, getting out of layings to the environments, have the ability to choose water layers with optimal temperature and salinity.

Accession: 024111331

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