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11 results on '"ROJAS-HERRERA, AGUSTIN"'

8. Richness and Species Composition of Helminth Communities in Yellowfin Snook (Centropomus robalito) (Centropomidae) from Coastal Lagoons in Guerrero, Mexico.

Author

VIOLANTE-GONZÁLEZ, JUAN, MONKS, SCOTT, ROJAS-HERRERA, AGUSTIN, and GUERRERO, SALVADOR GIL

Subjects
HELMINTHS, SPECIES, MONOGENEA, DIGENEA, ACANTHOCEPHALA, NEMATODES, LAGOONS
Abstract

The article evaluates the consistency of the species composition and richness of the helminth communities of adult yellowfin snook collected from Coastal Lagoons in Guerrero, Mexico. Monogenea, Digenea, Acanthocephala, and Nematoda are the species of helminth that were identified. A table showing the infection parameters for helminths, with different measurements of prevalence and abundance is presented. Characteristics of the component communities and infracommunities are discussed.

Published
2011
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9. Dinámica de las comunidades de parásitos del pámpano Parapsettus Panamensis en las costas del Pacífico Mexicano

Author

Villalba Vasquez, Princessa Jhossabeth, Violante Gonzalez, Juan, Garcia Ibañez, Sergio, Flores Garza, Rafael, Rosas Guerrero, Victor Manuel, and Rojas Herrera, Agustin Aucencio

Subjects
CIENCIAS AGRARIAS::PECES Y FAUNA SILVESTRE [CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA]
Abstract

Las comunidades de parásitos metazoarios pueden presentar cambios estructurales tanto espaciales como temporales, relacionados con variaciones estacionales y/o locales de algunos factores bióticos y abióticos. The metazoan parasite communities can present both spatial and temporal changes, related to seasonal and/or local variations of some biotic and abiotic factors.

Published
2018

10. Abundancia y diversidad de la comunidad Fito planctónica, en relación con factores ambientales de la bahía de Acapulco, guerrero. México

Author

Moreno Díaz, Giovanni, Rojas Herrera, Agustin Aucencio, and González González, Justiniano

Subjects
Tesauro de la UNESCO /Fitoplancton marino, DEMOGRAFÍA [CIENCIAS SOCIALES], Tesauro de la UNESCO /Composición de especies
Abstract

El plancton, es un término colectivo utilizado para denominar a una serie de organismos marinos y dulceacuícolas que van a la deriva o que flotan en la superficie del agua. Este se divide en fitoplancton y zooplancton. El fitoplancton se puede encontrar tanto en el medio marino como en dulceacuícola. En el mar, los grupos más sobresalientes son las diatomeas y los dinoflagelados, responsables de la productividad primaria, por lo cual son los iniciadores de la cadena trófica en ese medio (Acleto, 1998) Phytoplankton community species composition and abundance over time in Acapulco Bay, Mexico, were quantified from September 2009- April 2010, JanuaryApril and September 2011 to April-July and October and November 2012. Phytoplankton was taken at 2 stations, morro San Lorenzo and casa Díaz Ordaz. A total of 99 species were identified: 50 dinoflagellates, 40 diatoms, 4 cyanobacterias, 2 silicoflagellates, 2 chlorophytas and 1 charophyta. The dinoflagellate dominated during the rainy season and the diatoms dominated during the dry season. At least 7 potentially toxic dinoflagellate species were recorded which could generate harmful algal blooms (HABs) if bay environmental conditions are altered. In April 2012 an AB of Neoceratium balechii nontoxic species was recorded. The phytoplankton community proved to be a good indicator of environmental change in the Bay of Acapulco and its continuous monitoring is recommended as a way to detect changes in environmental quality of the bay

Published
2015

11. [Feeding habits of the fishes Lutjanus peru and Lutjanus guttatus (Pisces: Lutjanidae) of Guerrero, México].

Author

Rojas-Herrera AA, Mascaró M, and Chiappa-Carrara X

Subjects
Animals, Gastrointestinal Contents chemistry, Mexico, Pacific Ocean, Predatory Behavior physiology, Seasons, Competitive Behavior physiology, Feeding Behavior physiology, Perciformes physiology, Seawater
Abstract

Diet composition of the Pacific snapper (Lutjanus peru) 130-684 mm fork length (FL) and the spotted snapper (Lugjanus guttatus) 120-550 mm FL, was analyzed. Monthly samples were obtained from commercial landings in three regions off the coast of Guerrero, Mexico. Percentage by number (%N), percentage by weight (%W), and percentage of occurrence (%O) were calculated for each prey and summarized as the index of relative importance. Both species are polyphagous predators feeding on a variety of prey: Sixty-eight prey items, mainly fish (%W = 50.9), crustaceans (%W = 35.6), and mollusks (%W = 7.2), were found in the stomach contents of L. peru, while 88 components were identified in the diet of L. guttatus, the most important prey being fish (%W = 50.8) and crustaceans (%W = 43.4). Diet overlap between species is not significant (p<0.05), indicating that competition for food is unlikely. Based on published values of the relative importance index, the diets of these Lutjanidae were analyzed considering different regions of the Pacific coast of Mexico and Costa Rica, and similarities among sites and species were discussed. The cluster analysis showed that similarities among species inhabiting in the same area are more important than within organisms of the same species living in different zones. Results suggest that prey availability rather than food selectivity, conditions the feeding behavior of these fish species.

Published
2004

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