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- W187231627 abstract "The spatial variations of zooplankton communities (i.e. dispersion and retention) betweenan inshore embayment and an adjacent offshore coastal site were investigated. Waterenters the bay by its northern shore and circulates through it in a clockwise directionduring an outgoing tide and an anticlockwise direction during an incoming tide.Distribution of some species, such as Calanus australis, Temora turbinata, Noctilucascintillans, Podon sp, Penilia sp., showed a retention time in the bay of around 4 to 6weeks. Although there is clear evidence that mixing occurred between the bay and thechannel via a complex combination of winds and tides, and no barrier or gradient couldbe identified, some species were found only in the bay: examples are Oikopleura sp.,crustacean larvae, Clausocalanus ingens, and Oithona sp., which were retained in the bayprobably through a combination of behavioural strategies e.g. vertical migration orselective predation. Some oceanic species even maintained their position outside the bay(Labidocera cervi), and were not found inshore.Temporal and spatial variations of the surface zooplanktonic and neustoniccommunities of the south east coastal waters of Tasmania were studied. Data on theneuston in Australia are scarce and distribution atld life history of most of these speciesare poorly known. Pontella novaezelandiae (Pontellidae, Copepoda) (Farran 1929) wasrecorded for the first time in Tasmanian waters. Fifteen specimens were encounteredduring summer 2000-01, whereas the previous records in the region were mostly inautumn-winter off the North Island, New Zealand. In vitro observations of anotherneustonic species, Labidocera cervi (Pontellidae, Copepoda) (Kramer, 1895), revealedsome diel migration patterns. Adults live within the surface 10 em layer during daylight11and spread throughout the water column just after dusk, and juveniles spend most of theirtime at the surface, day or night. Some observations on the life history and ecology ofthese two neustonic species are described.The data obtained during 2000-01 sampling season were compared with earlierdata from 1971-73 sampled in nearby coastal waters. At the same site, using the samemethodology, two distinct communities were obtained in 1971-73 and 2000-01. Theimportance of Antarctic and subantarctic species is greatly reduced compared to 1971-73and the abundance of subtropical species has increased. These observations are supportedby changes in sea surface temperature and salinity off this coast during the last 45 years.Changes in the zooplankton community cannot be explained by the ENSO cycle. Thesechanges are consistent with a regime shift that has been described in the North Pacific." @default.
- W187231627 created "2016-06-24" @default.
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- W187231627 date "2004-06-01" @default.
- W187231627 modified "2023-09-27" @default.
- W187231627 title "Coastal zooplankton communities of south eastern Tasmania" @default.
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