Morphological and biochemical differentiation in Antarctic krill
During the February 1981 cruise FIBEX MD-25 between 30-50 degrees E and 61-64 degrees S, hydrography showed the presence of two gyres, confirmed by the geostrophic circulation relative to 1000 m from Levitus climatology, at the borders of these gyres concentrations of highly morphologically differen...
Published in: | Journal of Marine Systems |
---|---|
Main Authors: | , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2009
|
Subjects: | |
Online Access: | https://hal.science/hal-03505000 https://doi.org/10.1016/j.jmarsys.2008.12.022 |
id |
ftinsu:oai:HAL:hal-03505000v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-03505000v1 2024-02-11T09:57:39+01:00 Morphological and biochemical differentiation in Antarctic krill Faerber-Lorda, Jaime Beier, Emilio Mayzaud, Patrick CICESE Unidad La Paz Centro de Investigacion Cientifica y de Education Superior de Ensenada Mexico (CICESE) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2009 https://hal.science/hal-03505000 https://doi.org/10.1016/j.jmarsys.2008.12.022 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2008.12.022 hal-03505000 https://hal.science/hal-03505000 doi:10.1016/j.jmarsys.2008.12.022 ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-03505000 Journal of Marine Systems, 2009, 78 (4, SI), pp.525-535. ⟨10.1016/j.jmarsys.2008.12.022⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2009 ftinsu https://doi.org/10.1016/j.jmarsys.2008.12.022 2024-01-24T17:30:19Z During the February 1981 cruise FIBEX MD-25 between 30-50 degrees E and 61-64 degrees S, hydrography showed the presence of two gyres, confirmed by the geostrophic circulation relative to 1000 m from Levitus climatology, at the borders of these gyres concentrations of highly morphologically differentiated krill were found. Gaussian component analysis of krill samples, pooled by sectors, showed three cohorts of Euphausia superba in the western sector and one in the eastern sector. Across the sampling area, Thysanoessa mactura and E. superba occurred at separate stations. Analysis of cohorts in T macrura separated two size groups in both the western and the eastern sectors. The use of a Differentiation Index (D.I.) [Farber-Lorda, J., 1990. Somatic length relationships and ontogenetic morphometric differentiation of Euphausia superba and Thysanoessa macrura of the southwest Indian Ocean during summer (February 1981). Deep-Sea Res. 37,1135-1143.], based on somatic lengths, allows studying certain morphological differences within the populations sampled. Morphologically different and bigger males 11 (D.I. from 2.8 to 3.5) were present only in the southern transect while smaller males I (D.I. from 3.5 to 5.0) were present over the entire area. Biochemical composition of both species showed significant differences among stations for protein, lipids, and carbohydrates. A significant difference in lipid content was found between males I, and males II. For T macrura, percentage of lipid content in mature animals was much higher than that in E. superba. The D.I. size distribution showed that when populations of E. superba were highly differentiated (corresponding to mature animals) in morphology, lipid content was high, and they were located near a gyre. Differences in morphometry can influence distribution of the species, because different developing stages have different swimming capacities. It is shown that, together with hydrography and trophic conditions, lipid content and morphometry of krill populations, are ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Thysanoessa macrura Institut national des sciences de l'Univers: HAL-INSU Antarctic Indian Journal of Marine Systems 78 4 525 535 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Faerber-Lorda, Jaime Beier, Emilio Mayzaud, Patrick Morphological and biochemical differentiation in Antarctic krill |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
During the February 1981 cruise FIBEX MD-25 between 30-50 degrees E and 61-64 degrees S, hydrography showed the presence of two gyres, confirmed by the geostrophic circulation relative to 1000 m from Levitus climatology, at the borders of these gyres concentrations of highly morphologically differentiated krill were found. Gaussian component analysis of krill samples, pooled by sectors, showed three cohorts of Euphausia superba in the western sector and one in the eastern sector. Across the sampling area, Thysanoessa mactura and E. superba occurred at separate stations. Analysis of cohorts in T macrura separated two size groups in both the western and the eastern sectors. The use of a Differentiation Index (D.I.) [Farber-Lorda, J., 1990. Somatic length relationships and ontogenetic morphometric differentiation of Euphausia superba and Thysanoessa macrura of the southwest Indian Ocean during summer (February 1981). Deep-Sea Res. 37,1135-1143.], based on somatic lengths, allows studying certain morphological differences within the populations sampled. Morphologically different and bigger males 11 (D.I. from 2.8 to 3.5) were present only in the southern transect while smaller males I (D.I. from 3.5 to 5.0) were present over the entire area. Biochemical composition of both species showed significant differences among stations for protein, lipids, and carbohydrates. A significant difference in lipid content was found between males I, and males II. For T macrura, percentage of lipid content in mature animals was much higher than that in E. superba. The D.I. size distribution showed that when populations of E. superba were highly differentiated (corresponding to mature animals) in morphology, lipid content was high, and they were located near a gyre. Differences in morphometry can influence distribution of the species, because different developing stages have different swimming capacities. It is shown that, together with hydrography and trophic conditions, lipid content and morphometry of krill populations, are ... |
author2 |
CICESE Unidad La Paz Centro de Investigacion Cientifica y de Education Superior de Ensenada Mexico (CICESE) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Faerber-Lorda, Jaime Beier, Emilio Mayzaud, Patrick |
author_facet |
Faerber-Lorda, Jaime Beier, Emilio Mayzaud, Patrick |
author_sort |
Faerber-Lorda, Jaime |
title |
Morphological and biochemical differentiation in Antarctic krill |
title_short |
Morphological and biochemical differentiation in Antarctic krill |
title_full |
Morphological and biochemical differentiation in Antarctic krill |
title_fullStr |
Morphological and biochemical differentiation in Antarctic krill |
title_full_unstemmed |
Morphological and biochemical differentiation in Antarctic krill |
title_sort |
morphological and biochemical differentiation in antarctic krill |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-03505000 https://doi.org/10.1016/j.jmarsys.2008.12.022 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Thysanoessa macrura |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Thysanoessa macrura |
op_source |
ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-03505000 Journal of Marine Systems, 2009, 78 (4, SI), pp.525-535. ⟨10.1016/j.jmarsys.2008.12.022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2008.12.022 hal-03505000 https://hal.science/hal-03505000 doi:10.1016/j.jmarsys.2008.12.022 |
op_doi |
https://doi.org/10.1016/j.jmarsys.2008.12.022 |
container_title |
Journal of Marine Systems |
container_volume |
78 |
container_issue |
4 |
container_start_page |
525 |
op_container_end_page |
535 |
_version_ |
1790593196874530816 |