Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements
Associations of tunas and dolphins in the wild are quite frequent events and the question arises how predators requiring similar diet in the same habitat share their environmental resources. As isotopic composition of an animal is related to that of its preys, stable isotope ( 13 C/ 12 C and 15 N/ 1...
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Language: | English |
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2000
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ftvliz:oai:oma.vliz.be:32423 2023-05-15T17:38:21+02:00 Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements Das, K. Lepoint, G. Loizeau, V. Debacker, V. Dauby, P. Bouquegneau, J.-M. 2000 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=32423 en eng info:eu-repo/semantics/altIdentifier/wos/000086074300014 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/S0025-326X(99)00178-2 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=32423 info:eu-repo/semantics/restrictedAccess %3Ci%3EMar.+Pollut.+Bull.+40%282%29%3C%2Fi%3E%3A+102-109.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2FS0025-326X%2899%2900178-2%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2FS0025-326X%2899%2900178-2%3C%2Fa%3E Animal nutrition Bays Bioaccumulation Carbon isotopes Ecological distribution Heavy metals Marine animals Predators Radioisotopes [mammals] Delphinus delphis Stenella coeruleoalba (Meyen 1833) [Striped dolphin] Thunnus alalunga Thunnus alalunga (Bonnaterre 1788) ANE Biscay Bay Europe France info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2000 ftvliz https://doi.org/10.1016/S0025-326X(99)00178-2 2022-05-01T08:35:43Z Associations of tunas and dolphins in the wild are quite frequent events and the question arises how predators requiring similar diet in the same habitat share their environmental resources. As isotopic composition of an animal is related to that of its preys, stable isotope ( 13 C/ 12 C and 15 N/ 14 N) analyses were performed in three predator species from the North-east Atlantic: the striped dolphin, Stenella coeruleoalba , the common dolphin Delphinus delphis and the albacore tuna, Thunnus alalunga , and compared to their previously described stomach content. Heavy metals (Cd, Zn, Cu and Fe) are mainly transferred through the diet and so, have been determined in the tissues of the animals. Tuna muscles display higher d 15 N than in common and striped dolphins (mean: 11.4‰ vs. 10.3‰ and 10.4‰, respectively) which reflects their higher trophic level nutrition. Higher d 13 C are found in common (-18.4‰) and striped dolphin (-18.1‰) muscles than in albacore tuna (-19.3‰) probably in relation with its migratory pattern. The most striking feature is the presence of two levels of cadmium concentrations in the livers of the tunas (32 mg kg -1 dry weight (DW) vs. 5 mg kg -1 DW). These two groups also differ by their iron concentrations and their d 15 N and d 13 C liver values. These results suggest that in the Biscay Bay, tunas occupy two different ecological niches probably based on different squid inputs in their diet. Article in Journal/Newspaper North East Atlantic Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Marine Pollution Bulletin 40 2 102 109 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
topic |
Animal nutrition Bays Bioaccumulation Carbon isotopes Ecological distribution Heavy metals Marine animals Predators Radioisotopes [mammals] Delphinus delphis Stenella coeruleoalba (Meyen 1833) [Striped dolphin] Thunnus alalunga Thunnus alalunga (Bonnaterre 1788) ANE Biscay Bay Europe France |
spellingShingle |
Animal nutrition Bays Bioaccumulation Carbon isotopes Ecological distribution Heavy metals Marine animals Predators Radioisotopes [mammals] Delphinus delphis Stenella coeruleoalba (Meyen 1833) [Striped dolphin] Thunnus alalunga Thunnus alalunga (Bonnaterre 1788) ANE Biscay Bay Europe France Das, K. Lepoint, G. Loizeau, V. Debacker, V. Dauby, P. Bouquegneau, J.-M. Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements |
topic_facet |
Animal nutrition Bays Bioaccumulation Carbon isotopes Ecological distribution Heavy metals Marine animals Predators Radioisotopes [mammals] Delphinus delphis Stenella coeruleoalba (Meyen 1833) [Striped dolphin] Thunnus alalunga Thunnus alalunga (Bonnaterre 1788) ANE Biscay Bay Europe France |
description |
Associations of tunas and dolphins in the wild are quite frequent events and the question arises how predators requiring similar diet in the same habitat share their environmental resources. As isotopic composition of an animal is related to that of its preys, stable isotope ( 13 C/ 12 C and 15 N/ 14 N) analyses were performed in three predator species from the North-east Atlantic: the striped dolphin, Stenella coeruleoalba , the common dolphin Delphinus delphis and the albacore tuna, Thunnus alalunga , and compared to their previously described stomach content. Heavy metals (Cd, Zn, Cu and Fe) are mainly transferred through the diet and so, have been determined in the tissues of the animals. Tuna muscles display higher d 15 N than in common and striped dolphins (mean: 11.4‰ vs. 10.3‰ and 10.4‰, respectively) which reflects their higher trophic level nutrition. Higher d 13 C are found in common (-18.4‰) and striped dolphin (-18.1‰) muscles than in albacore tuna (-19.3‰) probably in relation with its migratory pattern. The most striking feature is the presence of two levels of cadmium concentrations in the livers of the tunas (32 mg kg -1 dry weight (DW) vs. 5 mg kg -1 DW). These two groups also differ by their iron concentrations and their d 15 N and d 13 C liver values. These results suggest that in the Biscay Bay, tunas occupy two different ecological niches probably based on different squid inputs in their diet. |
format |
Article in Journal/Newspaper |
author |
Das, K. Lepoint, G. Loizeau, V. Debacker, V. Dauby, P. Bouquegneau, J.-M. |
author_facet |
Das, K. Lepoint, G. Loizeau, V. Debacker, V. Dauby, P. Bouquegneau, J.-M. |
author_sort |
Das, K. |
title |
Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements |
title_short |
Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements |
title_full |
Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements |
title_fullStr |
Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements |
title_full_unstemmed |
Tuna and dolphin associations in the North-east Atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements |
title_sort |
tuna and dolphin associations in the north-east atlantic: evidence of different ecological niches from stable isotope and heavy metal measurements |
publishDate |
2000 |
url |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=32423 |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
%3Ci%3EMar.+Pollut.+Bull.+40%282%29%3C%2Fi%3E%3A+102-109.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2FS0025-326X%2899%2900178-2%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2FS0025-326X%2899%2900178-2%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000086074300014 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/S0025-326X(99)00178-2 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=32423 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0025-326X(99)00178-2 |
container_title |
Marine Pollution Bulletin |
container_volume |
40 |
container_issue |
2 |
container_start_page |
102 |
op_container_end_page |
109 |
_version_ |
1766138769521508352 |