TY - JOUR
T1 - Changes in the natural diet of green abalone haliotis fulgens during the 1997 to 1998 El Nio Event in Baja California Sur, Mexico
AU - Mazariegos-Villarreal, Alejandra
AU - Casas-Valdez, Margarita
AU - Siqueiros-Beltrones, David A.
AU - Pion-Gimate, Alejandra
AU - Serviere-Zaragoza, Elisa
PY - 2012/8
Y1 - 2012/8
N2 - A stomach content analysis was undertaken to determine the changes in the natural diet of the green abalone Haliotis fulgens as they relate to the 1997 to 1998 El Nio event at 2 sites along the central coast of the Baja California Peninsula. The index of relative importance of each identified food item was calculated, and Levin's index was used to determine the breadth of the diet. A total of 20 macroalgal species, 1 seagrass species, and 4 invertebrate species were observed from March 1997 to July 1998. The main constituents of the diet of H. fulgens before the 1997 to 1998 El Nio were Macrocystis pyrifera, Phyllospadix torreyi, and Cystoseira osmundacea. During and after, the principal items were Sargassum sp., Spatoglossum howelli, Cystoseira osmundacea, Dictyota sp., Gelidium sp., and Phyllospadix torreyi. Diet breadth of abalone diet was greater during and after El Nio 1997 to 1998 than before. Our results show that green abalone diet varies with the availability of the food source; therefore, El Nio events caused a major shift in diet related to changes in the local algal flora.
AB - A stomach content analysis was undertaken to determine the changes in the natural diet of the green abalone Haliotis fulgens as they relate to the 1997 to 1998 El Nio event at 2 sites along the central coast of the Baja California Peninsula. The index of relative importance of each identified food item was calculated, and Levin's index was used to determine the breadth of the diet. A total of 20 macroalgal species, 1 seagrass species, and 4 invertebrate species were observed from March 1997 to July 1998. The main constituents of the diet of H. fulgens before the 1997 to 1998 El Nio were Macrocystis pyrifera, Phyllospadix torreyi, and Cystoseira osmundacea. During and after, the principal items were Sargassum sp., Spatoglossum howelli, Cystoseira osmundacea, Dictyota sp., Gelidium sp., and Phyllospadix torreyi. Diet breadth of abalone diet was greater during and after El Nio 1997 to 1998 than before. Our results show that green abalone diet varies with the availability of the food source; therefore, El Nio events caused a major shift in diet related to changes in the local algal flora.
KW - ENSO
KW - Haliotis fulgens
KW - Macrocystis pyrifera
KW - green abalone
KW - kelp forest
KW - relative importance index
KW - stomach content
UR - http://www.scopus.com/inward/record.url?scp=84866686339&partnerID=8YFLogxK
U2 - 10.2983/035.031.0325
DO - 10.2983/035.031.0325
M3 - Artículo
SN - 0730-8000
VL - 31
SP - 795
EP - 800
JO - Journal of Shellfish Research
JF - Journal of Shellfish Research
IS - 3
ER -