Manta rays inhabit tropical, subtropical and temperate waters. Aggregation sites of manta rays ha... more Manta rays inhabit tropical, subtropical and temperate waters. Aggregation sites of manta rays have been recognized worldwide, but the reasons for this behavior are still poorly understood. This study describes environmental factors influencing aggregation sites of the giant manta ray (Manta birostris) off the northeastern coast of the Yucatan Peninsula. Observations of manta rays were obtained from scientific surveys conducted during 2006–2011. Environmental data were obtained from satellite imagery. The maximum entropy (Maxent) method for habitat modeling was used to determine the effects of environmental conditions on the species and predict suitable habitat for manta rays in this region. Primary productivity and distance to the coast were the most influential variables, suggesting that aggregation occurs in highly productive coastal waters. The distribution of manta rays predicted by the Maxent model showed that the most suitable habitat within the study area is located off the northeastern coast of the Yucatán Peninsula, more precisely, northeast of Isla Holbox and northwest of Isla Contoy. Seasonal patterns of distribution suggest that the most suitable conditions are present from July through September
Background: This report represents the first record of the sharpnose sevengill shark Heptranchias... more Background: This report represents the first record of the sharpnose sevengill shark Heptranchias perlo in Guatemala's Caribbean Sea. Methods: Two H. perlo specimens were captured by artisanal fishermen of the coastal community, El Quetzalito. All specimens were captured with a trammel net, in waters of 200 m depth
Background: The present study represents the first record of Scyliorhinus hesperius in Guatemala'... more Background: The present study represents the first record of Scyliorhinus hesperius in Guatemala's Caribbean Sea.
The first report of two smalltooth sand tiger sharks, Odontaspis ferox (Risso, 1810), off the con... more The first report of two smalltooth sand tiger sharks, Odontaspis ferox (Risso, 1810), off the continental Ecuador is presented herewith. The specimens were captured by the Ecuadorian fishing fleet and landed in Manta and Puerto López Canton, Ecuador. The juvenile female specimen was registered in November 2008 and the adult male in July 2009. Both of the specimens recorded extend the geographic range of distribution of O. ferox in the tropical eastern Pacific Ocean.
Manta rays inhabit tropical, subtropical and temperate waters. Aggregation sites of manta rays ha... more Manta rays inhabit tropical, subtropical and temperate waters. Aggregation sites of manta rays have been recognized worldwide, but the reasons for this behavior are still poorly understood. This study describes environmental factors influencing aggregation sites of the giant manta ray (Manta birostris) off the northeastern coast of the Yucatan Peninsula. Observations of manta rays were obtained from scientific surveys conducted during 2006–2011. Environmental data were obtained from satellite imagery. The maximum entropy (Maxent) method for habitat modeling was used to determine the effects of environmental conditions on the species and predict suitable habitat for manta rays in this region. Primary productivity and distance to the coast were the most influential variables, suggesting that aggregation occurs in highly productive coastal waters. The distribution of manta rays predicted by the Maxent model showed that the most suitable habitat within the study area is located off the northeastern coast of the Yucatán Peninsula, more precisely, northeast of Isla Holbox and northwest of Isla Contoy. Seasonal patterns of distribution suggest that the most suitable conditions are present from July through September
Background: This report represents the first record of the sharpnose sevengill shark Heptranchias... more Background: This report represents the first record of the sharpnose sevengill shark Heptranchias perlo in Guatemala's Caribbean Sea. Methods: Two H. perlo specimens were captured by artisanal fishermen of the coastal community, El Quetzalito. All specimens were captured with a trammel net, in waters of 200 m depth
Background: The present study represents the first record of Scyliorhinus hesperius in Guatemala'... more Background: The present study represents the first record of Scyliorhinus hesperius in Guatemala's Caribbean Sea.
The first report of two smalltooth sand tiger sharks, Odontaspis ferox (Risso, 1810), off the con... more The first report of two smalltooth sand tiger sharks, Odontaspis ferox (Risso, 1810), off the continental Ecuador is presented herewith. The specimens were captured by the Ecuadorian fishing fleet and landed in Manta and Puerto López Canton, Ecuador. The juvenile female specimen was registered in November 2008 and the adult male in July 2009. Both of the specimens recorded extend the geographic range of distribution of O. ferox in the tropical eastern Pacific Ocean.
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Papers by Ana Hacohen Domene