caa a22 4500 605509484 CHVBK 20210128100641.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10452-015-9517-4 doi (NATIONALLICENCE)springer-10.1007/s10452-015-9517-4 Stable isotope analysis versus TROPH: a comparison of methods for estimating fish trophic positions in a subtropical estuarine system [Elektronische Daten] [Felipe Amezcua, Víctor Muro-Torres, Martín Soto-Jiménez] Ecosystem-based fishery management programs require a reliable estimate of the trophic positions of aquatic resources. Both stable isotope analysis (SIA) and stomach content analysis (SCA) have been used to estimate the trophic positions (TP) of aquatic systems, but few studies have compared results from both methods. To determine whether the two methods produced similar results, we used SIA (δ15N and δ13C), SCA (estimated with the TROPH routine) and data from FishBase to estimate the TP of 66 fish species in a subtropical estuarine system of the Gulf of California. SIA values ranged from 2.6 to 5.6, with 56% of the species having a SIA value above 4.5, and 14% of the species having a SIA value below 4. The SCA values ranged from 2.6 to 4.8, with 76% of the species having a SCA value of 3-4. Overall, SCA results underestimated TP (including FishBase data), while SIA yielded better results, particularly if both δ15N and δ13C are used. The TROPH routine has oversimplified assumptions such as the same TP for all organisms in the same taxon, but if SIA is unavailable, SCA could be used, accompanied by knowledge of the TP of the most important prey items. Springer Science+Business Media Dordrecht, 2015 Fish trophic levels nationallicence δ15N and δ13C nationallicence Stomach contents analysis nationallicence Subtropical estuarine ecosystem nationallicence Amezcua Felipe Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Joel Montes Camarena s/n, 82040, Mazatlán, Sinaloa, Mexico aut Muro-Torres Víctor Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autonoma de Mexico, Unidad Academica Mazatlan, Mazatlán, México aut Soto-Jiménez Martín Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Joel Montes Camarena s/n, 82040, Mazatlán, Sinaloa, Mexico aut Aquatic Ecology Springer Netherlands 49/2(2015-06-01), 235-250 1386-2588 49:2<235 2015 49 10452 https://doi.org/10.1007/s10452-015-9517-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10452-015-9517-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Amezcua Felipe Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Joel Montes Camarena s/n, 82040, Mazatlán, Sinaloa, Mexico aut NATIONALLICENCE 700 1- Muro-Torres Víctor Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autonoma de Mexico, Unidad Academica Mazatlan, Mazatlán, México aut NATIONALLICENCE 700 1- Soto-Jiménez Martín Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Joel Montes Camarena s/n, 82040, Mazatlán, Sinaloa, Mexico aut NATIONALLICENCE 773 0- Aquatic Ecology Springer Netherlands 49/2(2015-06-01), 235-250 1386-2588 49:2<235 2015 49 10452