Observations on the seasonal occurrence and abundance of gelatinous zooplankton in Lough Hyne, Co. Cork, south-west Ireland

Ballard, L.; Myers, A.

Biology and Environment 100B(2): 75-83

2000


ISSN/ISBN: 0791-7945
DOI: 10.2307/20500083
Accession: 011080264

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Abstract
The seasonal distribution and abundance of medusae, siphonophores and ctenophores were investigated over a two-year period at Lough Hyne. Monthly samples of a 40m water column were taken. In total, 21 species of hydromedusae, three species of scyphomedusae and their ephyrae, one ctenophore and one siphonophore were recorded. Lough Hyne is significantly richer in gelatinous zooplankton species per unit area than other Irish inshore water bodies studied. The hydromedusa Proboscidactyla stellata (Forbes) was present in every month of the study period and showed a wide range of polymorphism. Ephyrae of the scyphomedusae occurred from January to March. All other species were most abundant from spring to autumn. In September 1994 Lizzia blondina (Forbes), an asexually reproducing medusa, reached a maximum density of 193m-3.