Seasonal vertical distribution and diel migration of zooplankton in a temperate stratified lake |
| |
Authors: | Evangelia Doulka George Kehayias |
| |
Institution: | (1) Department of Zoology, Plant Science and Environmental Research Institute, National University of Ireland Cork, Lee Maltings, Prospect Row, Cork, Ireland;(2) British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK |
| |
Abstract: | The investigation of the vertical distribution of the zooplankton community in the temperate Lake Trichonis during four seasons
in 2005, showed the existence of vertical segregation among species, ontogenetic stages and sexes within and between the major
groups. In each season, the two or three more abundant rotifer species distributed at separate depth layers, while this feature
was maintained during the entire 24 h period, since no diel vertical migrations (DVM) were performed. In contrast, the crustacean
community, comprised mainly by the calanoid copepod Eudiaptomus drieschi and the cladoceran Diaphanosoma orghidani, showed various patterns of DVM, being more pronounced in spring and summer. Females of E. drieschi distributed deeper than males, while the copepod nauplii were found mainly in the surface layer in all four seasons. Temperature
was the most important abiotic factor affecting directly and indirectly the vertical distribution and migration of various
species. During stratification, the metalimnion was the most productive layer in Lake Trichonis, having maximum values of
dissolved oxygen and low transparency due to high concentration of organic matter and phytoplankton. The DVM patterns of the
crustaceans indicate that the metalimnion acts probably as a daylight refuge against predation by Atherina boyeri, which is the dominant planktivorous fish in the lake. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|