Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Biology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842016000200469 |
Resumo: | Abstract Catches and exports of skate Rioraja agassizii place this species as “vulnerable to extinction” on the IUCN Red List; therefore, biological and ecological knowledge becomes an important instrument for its conservation control. This study described and quantified the diet composition of R. agassizii by means of stomach analysis contents in the periods 2005-2006 and 2012-2013. We analyzed and quantified stomach contents in terms of abundance (%N), weight (%M), frequency of occurrence (% FO), and index of relative importance (IRI). The results showed differences in the food rates between the periods. However, the groups of food items were the same: Teleostei fish, decapods, and mollusks. In 2005-2006, the diet consisted mainly of shrimp, however, in 2012-2013 it consisted of fish, followed by decapods, especially shrimps. The differences in diets may be attributed to shrimp abundance, which do not characterize a change in the eating habits in 2012-2013, because, in addition to fish, shrimps were also important food sources. The presence of a certain prey is more related to its availability rather than the feeding preference of skate. The amount of ingested items is associated to biological and environmental factors, so that further studies relating diet with capture area, seasonality, depth, and other factors should be conducted. |
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Brazilian Journal of Biology |
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Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazildietfeeding ecologyfeeding preferencepreystomach contentAbstract Catches and exports of skate Rioraja agassizii place this species as “vulnerable to extinction” on the IUCN Red List; therefore, biological and ecological knowledge becomes an important instrument for its conservation control. This study described and quantified the diet composition of R. agassizii by means of stomach analysis contents in the periods 2005-2006 and 2012-2013. We analyzed and quantified stomach contents in terms of abundance (%N), weight (%M), frequency of occurrence (% FO), and index of relative importance (IRI). The results showed differences in the food rates between the periods. However, the groups of food items were the same: Teleostei fish, decapods, and mollusks. In 2005-2006, the diet consisted mainly of shrimp, however, in 2012-2013 it consisted of fish, followed by decapods, especially shrimps. The differences in diets may be attributed to shrimp abundance, which do not characterize a change in the eating habits in 2012-2013, because, in addition to fish, shrimps were also important food sources. The presence of a certain prey is more related to its availability rather than the feeding preference of skate. The amount of ingested items is associated to biological and environmental factors, so that further studies relating diet with capture area, seasonality, depth, and other factors should be conducted.Instituto Internacional de Ecologia2016-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842016000200469Brazilian Journal of Biology v.76 n.2 2016reponame:Brazilian Journal of Biologyinstname:Instituto Internacional de Ecologia (IIE)instacron:IIE10.1590/1519-6984.21414info:eu-repo/semantics/openAccessMotta,N. S.Della-Fina,N.Souza,C. C. A.Rodrigues,E. S.Amorim,A. F.eng2016-06-16T00:00:00Zoai:scielo:S1519-69842016000200469Revistahttps://www.scielo.br/j/bjb/https://old.scielo.br/oai/scielo-oai.phpbjb@bjb.com.br||bjb@bjb.com.br1678-43751519-6984opendoar:2016-06-16T00:00Brazilian Journal of Biology - Instituto Internacional de Ecologia (IIE)false |
dc.title.none.fl_str_mv |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil |
title |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil |
spellingShingle |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil Motta,N. S. diet feeding ecology feeding preference prey stomach content |
title_short |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil |
title_full |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil |
title_fullStr |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil |
title_full_unstemmed |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil |
title_sort |
Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil |
author |
Motta,N. S. |
author_facet |
Motta,N. S. Della-Fina,N. Souza,C. C. A. Rodrigues,E. S. Amorim,A. F. |
author_role |
author |
author2 |
Della-Fina,N. Souza,C. C. A. Rodrigues,E. S. Amorim,A. F. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Motta,N. S. Della-Fina,N. Souza,C. C. A. Rodrigues,E. S. Amorim,A. F. |
dc.subject.por.fl_str_mv |
diet feeding ecology feeding preference prey stomach content |
topic |
diet feeding ecology feeding preference prey stomach content |
description |
Abstract Catches and exports of skate Rioraja agassizii place this species as “vulnerable to extinction” on the IUCN Red List; therefore, biological and ecological knowledge becomes an important instrument for its conservation control. This study described and quantified the diet composition of R. agassizii by means of stomach analysis contents in the periods 2005-2006 and 2012-2013. We analyzed and quantified stomach contents in terms of abundance (%N), weight (%M), frequency of occurrence (% FO), and index of relative importance (IRI). The results showed differences in the food rates between the periods. However, the groups of food items were the same: Teleostei fish, decapods, and mollusks. In 2005-2006, the diet consisted mainly of shrimp, however, in 2012-2013 it consisted of fish, followed by decapods, especially shrimps. The differences in diets may be attributed to shrimp abundance, which do not characterize a change in the eating habits in 2012-2013, because, in addition to fish, shrimps were also important food sources. The presence of a certain prey is more related to its availability rather than the feeding preference of skate. The amount of ingested items is associated to biological and environmental factors, so that further studies relating diet with capture area, seasonality, depth, and other factors should be conducted. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842016000200469 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842016000200469 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1519-6984.21414 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Instituto Internacional de Ecologia |
publisher.none.fl_str_mv |
Instituto Internacional de Ecologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Biology v.76 n.2 2016 reponame:Brazilian Journal of Biology instname:Instituto Internacional de Ecologia (IIE) instacron:IIE |
instname_str |
Instituto Internacional de Ecologia (IIE) |
instacron_str |
IIE |
institution |
IIE |
reponame_str |
Brazilian Journal of Biology |
collection |
Brazilian Journal of Biology |
repository.name.fl_str_mv |
Brazilian Journal of Biology - Instituto Internacional de Ecologia (IIE) |
repository.mail.fl_str_mv |
bjb@bjb.com.br||bjb@bjb.com.br |
_version_ |
1752129882919272448 |