Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown
The pelagic nekton community was sampled with the RMT 25 opening/closing net and a neuston net at two stations in the Scotia Sea south of the Antarctic Polar Front in the open ocean (Station 1) and on the South Georgia northwestern slope (Station 2). Downward oblique tows were made with the RMT 25 t...
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Language: | English |
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1995
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Online Access: | https://oceanrep.geomar.de/id/eprint/30953/ https://oceanrep.geomar.de/id/eprint/30953/1/art_10.1007_BF00349152.pdf https://doi.org/10.1007/BF00349152 |
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ftoceanrep:oai:oceanrep.geomar.de:30953 2023-05-15T14:08:30+02:00 Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown Rodhouse, P. G. Piatkowski, Uwe 1995-11 text https://oceanrep.geomar.de/id/eprint/30953/ https://oceanrep.geomar.de/id/eprint/30953/1/art_10.1007_BF00349152.pdf https://doi.org/10.1007/BF00349152 en eng Springer https://oceanrep.geomar.de/id/eprint/30953/1/art_10.1007_BF00349152.pdf Rodhouse, P. G. and Piatkowski, U. (1995) Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown. Open Access Marine Biology, 124 (1). pp. 111-117. DOI 10.1007/BF00349152 <https://doi.org/10.1007/BF00349152>. doi:10.1007/BF00349152 info:eu-repo/semantics/openAccess Article PeerReviewed 1995 ftoceanrep https://doi.org/10.1007/BF00349152 2023-04-07T15:22:54Z The pelagic nekton community was sampled with the RMT 25 opening/closing net and a neuston net at two stations in the Scotia Sea south of the Antarctic Polar Front in the open ocean (Station 1) and on the South Georgia northwestern slope (Station 2). Downward oblique tows were made with the RMT 25 through discrete 200 m layers to 1000 m in daylight and darkness. A total of 119 cephalopods representing nine species were removed from the samples, and mantle and arm lengths were measured to the nearest 0.1 mm. The most abundant species at each station was an undescribed Brachioteuthis sp. (B. ?picta). Galiteuthis glacialis and Alluroteuthis antarcticus were caught at both stations. Histioteuthis eltaninae, Bathyteuthis abyssicola and Psychroteuthis glacialis were caught at Station 1. Mastigoteuthis psychrophila and a Chiroteuthis sp. were caught at Station 2. B. ?picta was present throughout the water column to 1000 m at both stations, with little evidence of ontogenetic descent. There was evidence for ontogenetic descent in G. glacialis. This species was absent from the Antarctic Surface Water (ASW) at Station 1, where it was concentrated in the Circumpolar Deep Water (CDW). At Station 2 it was present throughout the water column to 1000 m. The other species were all caught in the core of the CDW (>400 m). In juvenile B. ?picta, G. glacialis and A. antarcticus, growth of the brachial crown is positively allometric with respect to mantle length. Recent data on biomass spectra in high-latitude pelagic systems show that they are characterised by the presence of peaks of biomass separated by biomass minima. Positive allometric growth in the brachial crown of these antarctic oceanic squid is suggested to have evolved as an adaptation to the peaked, or domed, structure of the pelagic biomass spectrum which must be spanned by these predators as their optimum prey size increases with growth. Interspecific differences in the allometry of tentacle growth are probably related to differences in strategies for stalking and ... Article in Journal/Newspaper Antarc* Antarctic antarcticus Scotia Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Scotia Sea The Antarctic Marine Biology 124 1 111 117 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The pelagic nekton community was sampled with the RMT 25 opening/closing net and a neuston net at two stations in the Scotia Sea south of the Antarctic Polar Front in the open ocean (Station 1) and on the South Georgia northwestern slope (Station 2). Downward oblique tows were made with the RMT 25 through discrete 200 m layers to 1000 m in daylight and darkness. A total of 119 cephalopods representing nine species were removed from the samples, and mantle and arm lengths were measured to the nearest 0.1 mm. The most abundant species at each station was an undescribed Brachioteuthis sp. (B. ?picta). Galiteuthis glacialis and Alluroteuthis antarcticus were caught at both stations. Histioteuthis eltaninae, Bathyteuthis abyssicola and Psychroteuthis glacialis were caught at Station 1. Mastigoteuthis psychrophila and a Chiroteuthis sp. were caught at Station 2. B. ?picta was present throughout the water column to 1000 m at both stations, with little evidence of ontogenetic descent. There was evidence for ontogenetic descent in G. glacialis. This species was absent from the Antarctic Surface Water (ASW) at Station 1, where it was concentrated in the Circumpolar Deep Water (CDW). At Station 2 it was present throughout the water column to 1000 m. The other species were all caught in the core of the CDW (>400 m). In juvenile B. ?picta, G. glacialis and A. antarcticus, growth of the brachial crown is positively allometric with respect to mantle length. Recent data on biomass spectra in high-latitude pelagic systems show that they are characterised by the presence of peaks of biomass separated by biomass minima. Positive allometric growth in the brachial crown of these antarctic oceanic squid is suggested to have evolved as an adaptation to the peaked, or domed, structure of the pelagic biomass spectrum which must be spanned by these predators as their optimum prey size increases with growth. Interspecific differences in the allometry of tentacle growth are probably related to differences in strategies for stalking and ... |
format |
Article in Journal/Newspaper |
author |
Rodhouse, P. G. Piatkowski, Uwe |
spellingShingle |
Rodhouse, P. G. Piatkowski, Uwe Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown |
author_facet |
Rodhouse, P. G. Piatkowski, Uwe |
author_sort |
Rodhouse, P. G. |
title |
Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown |
title_short |
Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown |
title_full |
Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown |
title_fullStr |
Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown |
title_full_unstemmed |
Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown |
title_sort |
fine-scale distribution of juvenile cephalopods in the scotia sea and adaptive allometry of the brachial crown |
publisher |
Springer |
publishDate |
1995 |
url |
https://oceanrep.geomar.de/id/eprint/30953/ https://oceanrep.geomar.de/id/eprint/30953/1/art_10.1007_BF00349152.pdf https://doi.org/10.1007/BF00349152 |
geographic |
Antarctic Scotia Sea The Antarctic |
geographic_facet |
Antarctic Scotia Sea The Antarctic |
genre |
Antarc* Antarctic antarcticus Scotia Sea |
genre_facet |
Antarc* Antarctic antarcticus Scotia Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/30953/1/art_10.1007_BF00349152.pdf Rodhouse, P. G. and Piatkowski, U. (1995) Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown. Open Access Marine Biology, 124 (1). pp. 111-117. DOI 10.1007/BF00349152 <https://doi.org/10.1007/BF00349152>. doi:10.1007/BF00349152 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/BF00349152 |
container_title |
Marine Biology |
container_volume |
124 |
container_issue |
1 |
container_start_page |
111 |
op_container_end_page |
117 |
_version_ |
1766280528621731840 |