TY - JOUR
T1 - Trophic Relationships between Two Gastropods and Seaweeds in Subtropical Rocky Reefs Based on Stable Isotope Analyses
AU - Piñón-Gimate, Alejandra
AU - Gómez-Valdez, Mercedes M.
AU - Mazariegos-Villarreal, Alejandra
AU - Serviere-Zaragoza, Elisa
PY - 2016/4/1
Y1 - 2016/4/1
N2 - The wavy turban snail Megastraea undosa and keyhole limpet Megathura crenulata, two gastropods with commercial importance, five macroalgae, and one seagrass were collected at Bahía Tortugas, Baja California Sur, Mexico, for analysis of stable isotope ratios. The δ13C and δ15N isotope signatures obtained from gastropod muscle tissue were different between the two gastropods. Isotope signatures of M. crenulata had more enriched δ13C (-14.35‰ ± 1.66‰) and δ15N (15.48‰ ± 0.67‰) than M. undosa isotope signatures for δ13C (-17.59‰ ± 2.43‰) and δ15N (12.42‰ ± 0.61‰). Seaweed isotope signals varied from -21.8‰ to -11.4‰ for δ13C and 9.3‰ to 10.9‰ for δ15N. The δ13C of detritus was -7.93 and of tunicates was -9.3‰ and the δ15N of detritus was 12.4 and of tunicates was 8.1‰. Mixing models showed that the greatest contribution to the diet of M. undosa was from Prionitis cornea and Gelidium robustum. For M. crenulata, it was from detritus and Macrocystis pyrifera. A higher trophic position (3.1) was observed for M. crenulata than M. undosa (2.3), which clearly reflected the differences in their feeding habits: M. undosa is a herbivore and M. crenulata is an omnivore.
AB - The wavy turban snail Megastraea undosa and keyhole limpet Megathura crenulata, two gastropods with commercial importance, five macroalgae, and one seagrass were collected at Bahía Tortugas, Baja California Sur, Mexico, for analysis of stable isotope ratios. The δ13C and δ15N isotope signatures obtained from gastropod muscle tissue were different between the two gastropods. Isotope signatures of M. crenulata had more enriched δ13C (-14.35‰ ± 1.66‰) and δ15N (15.48‰ ± 0.67‰) than M. undosa isotope signatures for δ13C (-17.59‰ ± 2.43‰) and δ15N (12.42‰ ± 0.61‰). Seaweed isotope signals varied from -21.8‰ to -11.4‰ for δ13C and 9.3‰ to 10.9‰ for δ15N. The δ13C of detritus was -7.93 and of tunicates was -9.3‰ and the δ15N of detritus was 12.4 and of tunicates was 8.1‰. Mixing models showed that the greatest contribution to the diet of M. undosa was from Prionitis cornea and Gelidium robustum. For M. crenulata, it was from detritus and Macrocystis pyrifera. A higher trophic position (3.1) was observed for M. crenulata than M. undosa (2.3), which clearly reflected the differences in their feeding habits: M. undosa is a herbivore and M. crenulata is an omnivore.
KW - Megastraea undosa
KW - Megathura crenulata
KW - gastropods
KW - macroalgae
KW - natural diet
KW - stable isotopes
UR - http://www.scopus.com/inward/record.url?scp=84970990780&partnerID=8YFLogxK
U2 - 10.2983/035.035.0120
DO - 10.2983/035.035.0120
M3 - Artículo
SN - 0730-8000
VL - 35
SP - 191
EP - 197
JO - Journal of Shellfish Research
JF - Journal of Shellfish Research
IS - 1
ER -