A comparison of the macrozooplankton faunas in two newfoundland fjords differing in physical oceanography

Abstract

HAEDRICH 1991 0710. A comparison of the macrozooplankton faunas in two Newfoundland fjords differing in physical oceanography. -Sarsia 76:41-52. Bergen. ISSN 0036-4827.The macrozooplankton faunas were compared between two Newfoundland fjords containing predominantly different deep-water masses; Bay d'Espoir contains warm, saline, Modified Slope Water while Fortune Bay contains cold, low-salinity, Labrador Current Water. Samples were collected in May 1982 and June 1983 using a 3-m Isaacs-Kidd Midwater Trawl. Data are presented on the species composition, relative abundance and vertical distribution of macrozooplankton. The fauna in both fjords consisted largely of the euphausiids Thysanoessa raschii, Thysanoessa inermis, Meganyctiphanes norvegica and the chaetognath Sagitta elegans. Eleven species occurred only in Fortune Bay while nine species occured only in Bay d'Espoir. Twenty species were common to the fjord faunas although eight of these occurred in low numbers. Catch rates were significantly different between fjords for eight species, but not for four species including T. raschii the most abundant species in both fjords. Differences in species composition and relative abundance could be attributed, in part, to the differing deep-water properties of the fjords. However, bottom depth and substrate type appeared to be important for some species.

Plankton of Southern Chilean fjords: trends and linkages

“…Similar results were obtained by Richard and Haedrich (1991) in a shallow Newfoundland fjord, where nine out of the eleven species of the pelagial of this fjord were gammarids, amphipods, mysids or semi-demersal shrimps, all suprabenthic species normally found in association with the substrate.…”

“…For instance, cold or deep living oceanic species occurred in a cold and deep Norwegian fjord, whereas migratory suprabenthic animals characterized the water column of another nearby fjord (Richard and Haedrich, 1991). Elsewhere, abrupt changes in bottom topography associated with seamounts, slope and shelf may affect the distribution of zooplankton to such an extent that zooplankton is accumulated in shallower areas or probably stranded near the bottom (Isaacs and Schwartzlose, 1965;Hobson and Chess, 1986;Simmard et al, 1986).…”

Chlorophyll and zooplankton in microbasins along the Strait of Magellan - Beagle Channel passage

“…;Wooldridge and Erasmus, 1980). On the other hand, differences in species composition and relative abundance of zooplankters in nearby fjords could be attributed to differing water properties, and also to bottom depth and substrate type (Richard and Haedrich, 1991). Topographic and hydrographic complexities of this fjord region (Pickard, 1971) support such possibilities, although detailed information on the fjords adjacent to the main passage studied is unavailable.…”

On the trophic fate of Phaeocystis pouchetii. VII. Sterols and fatty acids reveal sedimentation of P. pouchetii-derived organic matter via krill

“…could be important in the distribution areas of Thysanoessa raschii, T. inermis (e.g. Mauchline & Fisher 1969, Richard & Haedrich 1991, Hunt et al 1996 and P. pouchetii (Baumann et al 1994b), which co-occur in parts of the Arctic Ocean and the adjacent seas, but also in large areas of the Antarctic Ocean, where blooms of P. antarctica (e.g. di Tullio & Smith 1993, Smith et al 1995 could be a food reservoir for extensive swarms of Euphausia superba (Siegel & Loeb 1995) or E. crystallorophias (Makarov et al 1991).…”