Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands
The seasonal dietary composition and estimates of daily consumption rate of Lepidonotothen larseni and Gobionotothen marionensis juveniles were obtained for the first time using fish collected near sub-Antarctic Prince Edward Islands during April 1999–2003. The diet of L. larseni consisted mainly of...
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ftrhodesunivcory:vital:6948 2024-09-15T17:42:54+00:00 Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands Bushula, T Pakhomov, Evgeny A Kaehler, Sven Davis, S Kalin, R M 2005 14 p pdf http://hdl.handle.net/10962/d1011977 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6948 English eng vital:6948 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6948 http://hdl.handle.net/10962/d1011977 Article 2005 ftrhodesunivcory 2024-07-10T23:32:50Z The seasonal dietary composition and estimates of daily consumption rate of Lepidonotothen larseni and Gobionotothen marionensis juveniles were obtained for the first time using fish collected near sub-Antarctic Prince Edward Islands during April 1999–2003. The diet of L. larseni consisted mainly of pelagic prey, with copepods and arrow worms making up the most significant prey groups and accounting for 46% and 40% of prey mass, respectively. The diet of G. marionensis was more diverse than that of L. larseni and was composed mainly of benthic prey, including bottom-dwelling decapods (Nauticaris marionis) and sedentary polychaetes, which accounted for 54% and 30% of prey mass, respectively. During the present study, dietary overlap between juveniles of L. larseni and G. marionensis was very low (<5%) indicating that competition for food resources between them was negligible. They not only relied on different prey species, both also exhibited different diel feeding regimes. Daily consumption rate of L. larseni and G. marionensis juveniles was estimated to be 4.5% and 5.2% of body dry mass, respectively. Stomach contents and stable isotope analyses suggested, that both L. larseni and G. marionensis occupy the forth-trophic level of the sub-Antarctic food web but depend mainly on allochthonous and autochthonous (kelp derived) organic matter, respectively. Article in Journal/Newspaper Antarc* Antarctic Prince Edward Islands Copepods Rhodes University Cory: Repository |
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description |
The seasonal dietary composition and estimates of daily consumption rate of Lepidonotothen larseni and Gobionotothen marionensis juveniles were obtained for the first time using fish collected near sub-Antarctic Prince Edward Islands during April 1999–2003. The diet of L. larseni consisted mainly of pelagic prey, with copepods and arrow worms making up the most significant prey groups and accounting for 46% and 40% of prey mass, respectively. The diet of G. marionensis was more diverse than that of L. larseni and was composed mainly of benthic prey, including bottom-dwelling decapods (Nauticaris marionis) and sedentary polychaetes, which accounted for 54% and 30% of prey mass, respectively. During the present study, dietary overlap between juveniles of L. larseni and G. marionensis was very low (<5%) indicating that competition for food resources between them was negligible. They not only relied on different prey species, both also exhibited different diel feeding regimes. Daily consumption rate of L. larseni and G. marionensis juveniles was estimated to be 4.5% and 5.2% of body dry mass, respectively. Stomach contents and stable isotope analyses suggested, that both L. larseni and G. marionensis occupy the forth-trophic level of the sub-Antarctic food web but depend mainly on allochthonous and autochthonous (kelp derived) organic matter, respectively. |
format |
Article in Journal/Newspaper |
author |
Bushula, T Pakhomov, Evgeny A Kaehler, Sven Davis, S Kalin, R M |
spellingShingle |
Bushula, T Pakhomov, Evgeny A Kaehler, Sven Davis, S Kalin, R M Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands |
author_facet |
Bushula, T Pakhomov, Evgeny A Kaehler, Sven Davis, S Kalin, R M |
author_sort |
Bushula, T |
title |
Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands |
title_short |
Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands |
title_full |
Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands |
title_fullStr |
Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands |
title_full_unstemmed |
Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands |
title_sort |
diet and daily ration of two nototheniid fish on the shelf of the sub-antarctic prince edward islands |
publishDate |
2005 |
url |
http://hdl.handle.net/10962/d1011977 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6948 |
genre |
Antarc* Antarctic Prince Edward Islands Copepods |
genre_facet |
Antarc* Antarctic Prince Edward Islands Copepods |
op_relation |
vital:6948 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6948 http://hdl.handle.net/10962/d1011977 |
_version_ |
1810489714799542272 |