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:: Volume 14, Issue 3 (7-2015) ::
IJFS 2015, 14 Back to browse issues page
Diet and trophic level of scalloped hammerhead shark (Sphyrna lewini) from the Gulf of California and Gulf of Tehuantepec, Mexico
Y.E Torres Rojas * , F Paez Osuna , J Camalich , F Galvan Magaña
, yassirtorres@gmail.com
Abstract:   (3508 Views)
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.
Keywords: Shark, Sphyrna lewini, Gulf of Tehuantepec, Mexico, Stomach content analysis, Stable isotopes.
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Type of Study: Orginal research papers | Subject: Ecology
Received: 2012/12/14 | Accepted: 2014/05/11 | Published: 2015/09/5
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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-en.html


Volume 14, Issue 3 (7-2015) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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