Artículos Científicos Campus Puerto Escondido
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Item type: Ítem , Length-Weight and Length-Length Relationships of 39 Demersal Fish Species of an Estuarine-Coastal Ecosystem from the Northwestern of the Baja California Peninsula, Mexico(Journal of Applied Ichthyology, 2024-02-29) González-Acosta, Adrián F.; Rábago-Quiroz, Carlos H.; Ruiz-Campos, Gorgonio; García-Borbón, Juan Antonio; Alejo-Plata, María del Carmen; Barrón-Barraza, Francisco J.The length-weight (LW) and length-length (LL) relationships of 39 demersal fish species belonging to 19 families were calculated. Fish samples were collected monthly during the open (September–February) and close (March–August) shrimp fishing seasons from 2014 to 2022 by the artisanal fishery in the Bahía Magdalena-Almejas lagoon system (BMA), using small boats and a shrimp bottom trawl with 16–17 m top rope and 38 mm mesh opening. Total (TL) and standard (SL) lengths and total weight (TW) were measured for all fish specimens. The b parameter of the LW relationship ranged from the minimum of 2.483 for Cynoscion parvipinnis to 3.775 as the maximum for Bagre panamensis while, for the LL relationship, the parameter b ranged from 0.685 for Balistes polylepis to 0.994 for Orthopristis cantharinus. Both LW and LL relationships were highly correlated (; . The parameter b of the LW relationship indicated that 59% of the fish species showed isometric and 41% allometric growth. Information on LW and LL relationships is updated for thirteen species, and four are reported for the first time: Citharichthys xanthostigma, Ophidion galeoides, Pleuronichthys guttulatus, and P. ritteri. This study will be useful to update the LW relationship parameters for data-poor fish species and contribute to the accuracy of fish stock assessment in the BMA fisheries.Item type: Ítem , Evaluation of CNN Models with Transfer Learning in Art Media Classification in Terms of Accuracy and Class Relationship(Computación y Sistemas, 2024) Fortuna-Cervantes, Juan Manuel; Soubervielle-Montalvo, Carlos; Puente-Montejano, Cesar Augusto; Perez-Cham, Oscar Ernesto; Pena-Gallardo, RafaelThe accuracy obtained in Art Media Classification (AMC) using CNN is lower compared to other image classification problems, where the acceptable accuracy ranges from 90 to 99%. This article presents an analysis of the performance of three different CNNs with transfer learning for AMC, to answer the question of what challenges arise in this application. We proposed the Art Media Dataset (ArtMD) to train three CNNs. ArtMD contains five classes of art: Drawing, Engraving, Iconography, Painting, and Sculpture. The analysis of the results demonstrates that all the tested CNNs exhibit similar behavior. Drawing, Engraving, and Painting had the highest relationship, showing a strong relationship between Drawing and Engraving. We implemented two more experiments, removing first Drawing and then Engraving. The best performance with 86% accuracy was achieved by removing Drawing. Analysis of the confusion matrix of the three experiments for each CNN confirms that Drawing and Painting have the lowest accuracy, showing a strong misclassification with the other classes. This analysis presents the degree of relationship between the three CNN models and details the challenges of AMC.Item type: Ítem , Avifauna diversity assessment in the Communal Natural Protected Area El Gavilán, Central Coast of Oaxaca, Mexico(Nature Conservation Research, 2023-12-08) García-Grajales, Jesús; Juárez-Santiago, Carlos D.; Buenrostro Silva, AlejandraTropical dry forest (TDF) is an ecosystem with a pronounced seasonality and high animal diversity. It is threatened by a wide variety of anthropogenic activities such as human population growth, deforestation rate, tourism development, forest fires, overhunting, and wildlife trade. One of the strategies for this biodiversity conservation is the creation of Communal Natural Protected Areas (CNPA), which are poorly explored. The aim of this study was to supply an assessment of the avian diversity in the CNPA El Gavilán on the Central Coast of Oaxaca (Mexico) during two seasons (dry and rainy). Sampling has been carried out at two localities (named as Centre and Mountain) between November 2018 and September 2019, using a point count method. At each locality, we sampled one transect varying in length, but with five-point counts separated by a minimum of 200 m. We made monthly two visits per transect. Birds were counted from a fixed raising position within a circle of 50-m radius for a specific period (10 min.) at every point. In total, 85 species were recorded, which belong to 65 genera, 24 families, and 13 orders. The most representative order was Passeriformes with 53 species. Most species (83) were considered very rare, and two species (Aratinga canicularis and Calocitta formosa) were rare. Regarding the avian diversity, 0D, the Centre locality had 74 species (19 exclusive species), while the Mountain locality had 65 species (11 exclusive species). The dry season had a higher diversity (Hʹ = 3.44) than the rainy season (Hʹ= 3.41), but there were no significant differences (Hutcheson t = 0.365, d.f. = 1, p > 0.05). Eighty-two percent (70 species) were considered residents, 15.3% (13 species) were winter migrants, 1.2% (one species) were summer migrants, and 1.2% (one species) were transient. Of the total registered taxa, 50 species were principally insectivorous, 14 species were grain-frugivorous, eight species were omnivorous, six species were carnivorous, and six species were nectarivorous. The avifauna of CNPA El Gavilán shows that a marked effect does not exist in the species composition between seasons. Due to the species richness recorded and estimated there, the study area should be considered in conservation policies, particularly because this territory is under intense pressure due to changes in land use.