Biological characteristics of Uphausia superba dan in acoustically detected aggregations near Elephant Island, Antarctica /
acoustic transponder. Discrete samples were collected at
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | acoustic transponder. Discrete samples were collected at affected by the degree of water stratification, which in turn aggregations and to determine the influence of physical and and adult krill >45 mm associated with Transition Type 11 Antarctic Surface Water (AASW). On the spatial mesoscale, Antarctica. Four areas of high krill concentrations were biological factors on Euphausia superba distributions. The degree of water stratification. These data suggest vertical developmental stages between the thermocline and mixed layer developmental stages were observed in the mixed layer of diel migration by Euphausia superba which may have been distances of 127-225 meters. However, some nets which fished during the austral summer 1991-92 Antarctic Marine Living Euphausia superba aggregations were sampled with a Multiple Euphausia superba distributions showed a distinct separation Euphausia superba length distribution and the proportion of fine-scale, vertical stratification of krill with identified with a towed l2OkHz single frequency spift-beam individuals with the same developmental swimming skills. No juveniles <30mm associated with WSC in shallower shelf waters marking the mixing of Weddell Scotia Confluence (WSC) and may influence phytoplankton population growth. On a spatial MOCNESS study area included a major hydrographic front Multiple Range Analysis which implies that horizontal observed in nets which collected at one depth over horizontal of length and developmental stages by water mass, with Opening/Closing Net and Environmental Sensor System (MOCNESS) patchy phytoplankton distributions or schooling with other Resources (AMLR) survey in the vicinity of Elephant Island, responses may be affecting krill distribution on this finer scale. For example, Euphausia superba may be responding to significant differences in Euphausia superba mean length were significantly different mean lengths and proportions of stage variability vertically and horizontally within stratified layers of Euphausia superba were observed from the surface to 20 meters depth. These data suggest behavioral that varied with the diel period of the samples and the user-designated depths to examine length and developmental variability exists on spatial scales <125 meters. water and the presence of Circumpolar Deep Water (CDW) on the weakly and strongly stratified water. As many as four west shelf and slope. There were significant differences in within a restricted stratum grouped separately in Duncan's |
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| Item Description: | "Major subject: Oceanography". Vita. |
| Physical Description: | xiii, 111 leaves : illustrations, maps ; 28 cm. Also available online. |
| Bibliography: | Includes bibliographical references. |