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10 results on '"Medina-López, Marco A."'

5. Feeding habits of the horn shark Heterodontus francisci (Girard, 1855) in the northwest of Baja California Sur, Mexico.

Author

Cortés‐Fuentes, Christian, Simental‐Anguiano, María del Rosario, Galván‐Magaña, Felipe, and Medina‐López, Marco Antonio

Subjects
SEA urchins, SHARKS, HABIT, OCTOPUSES, LOBSTERS, STOMACH
Abstract

The feeding habits of the horn shark, Heterodontus francisci (Girard, 1855), were examined in the area of Bahía Tortugas, Baja California Sur, Mexico in the spring, summer and fall of 2014. A total of 78 stomachs were collected, of which 46 (59%) contained food and 32 (41%) were empty. According to the percent Index of Relative Importance (%IRI), the most important prey categories in H. francisci's diet were anomurans (66%), cephalopods (7.2%), lobsters (4.7%), fishes (4.2%) and sea urchins (2.3%). The main prey were the anomuran Blepharipoda occidentalis (65.2%), the octopus Octopus bimaculatus (5.4%), the lobster Panulirus interruptus (4.7%) and the sea urchin Echinometra vanbrunti (2.6%). According to the Levin standardized Index (Bi), the trophic niche breadth in H. francisci is low (Bi = 0.21), making it a specialist predator. The species was classified as a tertiary consumer (trophic position = 4.06). [ABSTRACT FROM AUTHOR]

Published
2020
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8. DIET OF OCTOPUS BIMACULATUS VERRIL, 1883 (CEPHALOPODA: OCTOPODIDAE) IN BAHÍA DE LOS ÁNGELES, GULF OF CALIFORNIA.

Author

ARMENDÁRIZ VILLEGAS, ELISA JEANNEHT, CEBALLOS-VÁZQUEZ, BERTHA PATRICIA, MARKAIDA, UNAI, ABITIA-CÁRDENAS, ANDRÉS, MEDINA-LÓPEZ, MARCO ANTONIO, and ARELLANO-MARTÍNEZ, MARCIAL

Abstract

Two hundred sixty-one octopuses were obtained from August 2006 to June 2007 in Bahía de Los Angeles, BC, Mexico. Sizes ranged from 58-190 mm in mantle length. Diet was determined from 3 sources: the digestive tract analysis (hard rests), accumulations of hard prey remaining in refuges, and live prey present during capture. Ripe females had the greatest fullness weight index (FWI) whereas spawning/spent females had the lowest. During the spring, female and male octopuses showed the greatest FWI, whereas in summer they showed the lowest, coinciding with the spawning/spent stage. A total of 76 prey items from 8 phyla were found, with Mollusca being the most important phylum and xanthid crabs the most important prey year-round. During autumn and winter, more bivalves were consumed, whereas more crabs were consumed in spring. Males fed mainly on crabs during all gonad development stages, but spent males fed mostly on molluscs. In contrast, females fed mostly on molluscs, except ripe females, which included more crabs in their diet. The octopus Octopus bimaculatus appears to be a specialist consumer, and this selectivity could be a consequence of different energetic demands of each sex during the gonad ripening process. [ABSTRACT FROM AUTHOR]

Published
2014
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10. Potential Morphological Contributions to a Live Stranding: Abnormal Snout and Conchoderma auritum Infestation in a Bottlenose Dolphin (Tursiops truncatus).

Author

Elorriaga-Verplancken, Fernando R., Tobar-Hurtado, Susana, Medina-López, Marco A., de la Cruz, Daniela Bárcenas, and Urbán R., Jorge

Subjects
*BOTTLENOSE dolphin, *DOLPHINS, *ABNORMALITIES in animals, *MARINE animal diseases, *WOUND healing, *HEALTH, *MAMMALS
Abstract

The article focuses on the rescue to an adult male bottlenose dolphin found at La Paz Cove, Baja California Sur, Mexico on April 19, 2014. Topics discussed include abnormalities observed with the dolphin which include barnacle infestation around oral cavity, absence of snout at the tip of the upper jaw, and traumatic injury suffered by the mammal.

Published
2015
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