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Rastgoo, Ali Reza, Fatemi, S.M.R, Valinassab, T, Mortazavi, M.S. (1396). Feeding habits and trophic level of sharpnose stingray, Himantura gerrardi (Elasmobranchii Dasyatidae) in northern Oman Sea: effects of sex and size class. سامانه مدیریت نشریات علمی, 17(1), 137-150. doi: 10.22092/ijfs.2018.115590
Ali Reza Rastgoo; S.M.R Fatemi; T Valinassab; M.S Mortazavi. "Feeding habits and trophic level of sharpnose stingray, Himantura gerrardi (Elasmobranchii Dasyatidae) in northern Oman Sea: effects of sex and size class". سامانه مدیریت نشریات علمی, 17, 1, 1396, 137-150. doi: 10.22092/ijfs.2018.115590
Rastgoo, Ali Reza, Fatemi, S.M.R, Valinassab, T, Mortazavi, M.S. (1396). 'Feeding habits and trophic level of sharpnose stingray, Himantura gerrardi (Elasmobranchii Dasyatidae) in northern Oman Sea: effects of sex and size class', سامانه مدیریت نشریات علمی, 17(1), pp. 137-150. doi: 10.22092/ijfs.2018.115590
Rastgoo, Ali Reza, Fatemi, S.M.R, Valinassab, T, Mortazavi, M.S. Feeding habits and trophic level of sharpnose stingray, Himantura gerrardi (Elasmobranchii Dasyatidae) in northern Oman Sea: effects of sex and size class. سامانه مدیریت نشریات علمی, 1396; 17(1): 137-150. doi: 10.22092/ijfs.2018.115590

Feeding habits and trophic level of sharpnose stingray, Himantura gerrardi (Elasmobranchii Dasyatidae) in northern Oman Sea: effects of sex and size class

Iranian Journal of Fisheries Sciences
مقاله 11، دوره 17، شماره 1، فروردین 2018، صفحه 137-150    اصل مقاله (711.49 K)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22092/ijfs.2018.115590
نویسندگان
Ali Reza Rastgoo* 1؛ S.M.R Fatemi2؛ T Valinassab3؛ M.S Mortazavi4
1Department of Marine Biology, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
2Department of Marine Biology, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran.
3Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), P.O. Box: 14965/149. Tehran, Iran.
4Persian Gulf and Oman Sea Ecological Center, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), Bandar Abbas, Iran.
چکیده
The feeding habits and trophic level of Himantura gerrardi were studied according to sex and size classes utilizing 80 individuals obtained using bottom trawl between May and December 2014 from Oman Sea. Collected specimens were divided in three size classes (small 58 cm) based on disk width (DW). Preys were identified in seven main zoological categories, where crustacean and polychaetes were the dominant in diets, which indicating this species is a demersal dwelling species. No significant differences were observed between sexes, but size classes showed a significance differences in their diets. Also, results showed a decreasing of feeding overlap between size classes by increasing of DW, suggesting that intraspecific competition reduced, which allows the coexistence of different size classes. Trophic level was positively correlated with the DW, which were lower than 4.0 for both sexes and different size classes, placing it in intermediate trophic level.
کلیدواژه‌ها
Dasyatidae؛ Himantura gerrardi؛ Feeding habits؛ Trophic level؛ Oman Sea
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تعداد مشاهده مقاله: 340
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