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:: دوره 14، شماره 3 - ( 1394 ) ::
جلد 14 شماره 3 صفحات 767-785 برگشت به فهرست نسخه ها
Diet and trophic level of scalloped hammerhead shark (Sphyrna lewini) from the Gulf of California and Gulf of Tehuantepec, Mexico
چکیده:   (6366 مشاهده)
We examined the diet and trophic level of Sphyrna lewini in the Gulf of California (GC) during 2001 and in the Gulf of Tehuantepec (GT) during 2005 using data from stomach content and stable isotope analysis of δ15N and δ13C. S. lewini diet was represented by pelagic and benthic prey species where the most important in weight was Scomber japonicus (27.70±4.54%) in GC, while in GT it was Auxis spp. (26.19±4.14%). There were differences for δ15N and δ13C between group sizes, showing a difference in the use of area and resources, while the differences for δ15N and δ13C between areas were related to changes in the isotopic signal from the base of the food web in each region. Based on δ13C and δ15N variability, diversity values (GC=3.69 GT=3.17) and diet breadth (GC=0.006 GT=0.002), we propose that S. lewini is an opportunistic predator. The trophic level of S. lewini was above four in all categories, which indicates that S. lewini is a tertiary consumer. We may conclude that S. lewini plays an important functional role as top predator within areas of Mexico.
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نوع مطالعه: پژوهشي | موضوع مقاله: Ecology
دریافت: 1391/9/24 | پذیرش: 1393/2/21 | انتشار: 1394/6/14
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Torres Rojas Y, Paez Osuna F, Camalich J, Galvan Magaña F. Diet and trophic level of scalloped hammerhead shark (Sphyrna lewini) from the Gulf of California and Gulf of Tehuantepec, Mexico . IJFS. 2015; 14 (3) :767-785
URL: http://jifro.ir/article-1-792-fa.html

Diet and trophic level of scalloped hammerhead shark (Sphyrna lewini) from the Gulf of California and Gulf of Tehuantepec, Mexico . مجله علوم شیلاتی ایران. 1394; 14 (3) :767-785

URL: http://jifro.ir/article-1-792-fa.html



دوره 14، شماره 3 - ( 1394 ) برگشت به فهرست نسخه ها
Iranian Journal of Fisheries Sciences Iranian Journal of Fisheries Sciences
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