Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction
Beaks of 133 specimens of Todarodes sagittatus caught in the central East Atlantic were studied. Relationships between several measurements of the upper and lower beaks and dorsal mantle length (DML) and total mass were calculated. The darkening process or pigmentation of both beaks was investigated...
Published in: | South African Journal of Marine Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Taylor & Francis
1998
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Online Access: | https://oceanrep.geomar.de/id/eprint/5094/ https://oceanrep.geomar.de/id/eprint/5094/1/1998%20HernandezGarcia_etal_SAfrJMarSci20.pdf https://doi.org/10.2989/025776198784126485 |
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ftoceanrep:oai:oceanrep.geomar.de:5094 2023-05-15T16:01:35+02:00 Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction Hernandez-García, V. Piatkowski, Uwe Clarke, M. R. 1998 text https://oceanrep.geomar.de/id/eprint/5094/ https://oceanrep.geomar.de/id/eprint/5094/1/1998%20HernandezGarcia_etal_SAfrJMarSci20.pdf https://doi.org/10.2989/025776198784126485 en eng Taylor & Francis https://oceanrep.geomar.de/id/eprint/5094/1/1998%20HernandezGarcia_etal_SAfrJMarSci20.pdf Hernandez-García, V., Piatkowski, U. and Clarke, M. R. (1998) Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction. Open Access South African Journal of Marine Science, 20 . pp. 363-373. DOI 10.2989/025776198784126485 <https://doi.org/10.2989/025776198784126485>. doi:10.2989/025776198784126485 cc_by_3.0 info:eu-repo/semantics/openAccess Article PeerReviewed 1998 ftoceanrep https://doi.org/10.2989/025776198784126485 2023-04-07T14:50:36Z Beaks of 133 specimens of Todarodes sagittatus caught in the central East Atlantic were studied. Relationships between several measurements of the upper and lower beaks and dorsal mantle length (DML) and total mass were calculated. The darkening process or pigmentation of both beaks was investigated and a qualitative scale of eight degrees of pigmentation developed. Except for the hood of the lower beak, the growth of both beaks was allometrically negative in relation to DML in males, whereas the growth of several parts of both beaks of females was allometrically positive. The hood grew faster than all other parts of the male beak and faster than all parts of the lower beak of females. Regression coefficients calculated for the growth of the beaks revealed differences between the growth patterns of females and males (p < 0.05). The results relating to darkening and the maturing process suggest that they are related and that they take place over a very short period in the life of the squid. Article in Journal/Newspaper DML OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) South African Journal of Marine Science 20 1 363 373 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Beaks of 133 specimens of Todarodes sagittatus caught in the central East Atlantic were studied. Relationships between several measurements of the upper and lower beaks and dorsal mantle length (DML) and total mass were calculated. The darkening process or pigmentation of both beaks was investigated and a qualitative scale of eight degrees of pigmentation developed. Except for the hood of the lower beak, the growth of both beaks was allometrically negative in relation to DML in males, whereas the growth of several parts of both beaks of females was allometrically positive. The hood grew faster than all other parts of the male beak and faster than all parts of the lower beak of females. Regression coefficients calculated for the growth of the beaks revealed differences between the growth patterns of females and males (p < 0.05). The results relating to darkening and the maturing process suggest that they are related and that they take place over a very short period in the life of the squid. |
format |
Article in Journal/Newspaper |
author |
Hernandez-García, V. Piatkowski, Uwe Clarke, M. R. |
spellingShingle |
Hernandez-García, V. Piatkowski, Uwe Clarke, M. R. Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction |
author_facet |
Hernandez-García, V. Piatkowski, Uwe Clarke, M. R. |
author_sort |
Hernandez-García, V. |
title |
Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction |
title_short |
Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction |
title_full |
Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction |
title_fullStr |
Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction |
title_full_unstemmed |
Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction |
title_sort |
development of the darkening of the todarodes sagittatus beaks and its relation to growth and reproduction |
publisher |
Taylor & Francis |
publishDate |
1998 |
url |
https://oceanrep.geomar.de/id/eprint/5094/ https://oceanrep.geomar.de/id/eprint/5094/1/1998%20HernandezGarcia_etal_SAfrJMarSci20.pdf https://doi.org/10.2989/025776198784126485 |
genre |
DML |
genre_facet |
DML |
op_relation |
https://oceanrep.geomar.de/id/eprint/5094/1/1998%20HernandezGarcia_etal_SAfrJMarSci20.pdf Hernandez-García, V., Piatkowski, U. and Clarke, M. R. (1998) Development of the darkening of the Todarodes sagittatus beaks and its relation to growth and reproduction. Open Access South African Journal of Marine Science, 20 . pp. 363-373. DOI 10.2989/025776198784126485 <https://doi.org/10.2989/025776198784126485>. doi:10.2989/025776198784126485 |
op_rights |
cc_by_3.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.2989/025776198784126485 |
container_title |
South African Journal of Marine Science |
container_volume |
20 |
container_issue |
1 |
container_start_page |
363 |
op_container_end_page |
373 |
_version_ |
1766397375778127872 |