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Vertical variability in the diversity and abundance of fish larvae in a shallow tropical estuary in southern Gulf of Mexico

Coutiño Sánchez, Violeta Yasmín [autora] | Mendoza Carranza, Manuel [autor] | Arévalo Frías, Wendi del Carmen [autora] | Pech Pool, Daniel Guadalupe [autor].
Tipo de material: Artículo en línea Artículo en línea Tipo de contenido: Texto Tipo de medio: Computadora Tipo de portador: Recurso en líneaTema(s): Larvas de peces | Abundancia relativa | Hábitat (Ecología) | Peces de estuariosTema(s) en inglés: Fish larvae | Relative abundance | Habitat (Ecology) | Estuarine fishesDescriptor(es) geográficos: Río San Pedro (Tabasco, México) | Río San Pablo (Tabasco, México) | Reserva de la Biosfera Pantanos de Centla (Tabasco, México) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Regional Studies in Marine Science. Volumen 66, 103179 (December 2023), páginas 1-11. --ISSN: 2352-4855Número de sistema: 61155Resumen:
Inglés

Vertical migration in ichthyoplankton is relevant for its survive and it has been documented in estuaries with more than 10 m depth. In shallow estuaries this process is unknow or not supposed since no environmental stratification is assumed. The objective of this research is to investigate the vertical variability of fish larvae assemblages in shallow tropical estuarine zones. The model study site was the estuarine area of the San Pedro y San Pablo River located east of the Centla Wetland Biosphere Reserve in the Gulf of Mexico. The experimental design includes depth (bottom-surface), habitat type (coast-low complexity and mangrove-high complexity), circadian cycle (sunrise–midday– sunset–night), and season (dry-rainy). The ichthyoplankton were collected using a supporting net (150 cm in length, 50 cm mouth diameter, 400 μm mesh size) device for simultaneous collection on the surface and bottom. Circular tows (2.7–4 km/h) were carried out for 5 min. A total of 40,968 fish larvae were collected, belonging to 13 orders, 26 families, and 38 species. The highest larval abundance expressed as mean density (693 ± 916 ind/m³), richness (4.57 ± 3.46), Shannon-Wiener diversity (1.05 ± 48.48), and Pielou evenness (0.88 ± 0.3) were recorded in the bottom. The variance component analysis indicated that the most important factors to explain the larval abundance was the depth (15.55%), the period of the day (11.20 %) and the interaction between all factors (10.51 %). Fish larvae species as Achirus lineatus, Trinectes maculatus, Etropus crossotus, and Symphurus civitatium occupied only the bottom. Despite the low depth, a vertical stratification was observed in the physicochemical parameters, especially in the salinity, being greater in the bottom than in the surface during the two seasons and habitat type and it was related with higher values of abundance, richness, and diversity of ichthyoplankton.

Recurso en línea: https://doi.org/10.1016/j.rsma.2023.103179
Lista(s) en las que aparece este ítem: GANADERIA SUSTENTABLE Y CAMBIO CLIMATICO
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Disponible para usuarios de ECOSUR con su clave de acceso

Vertical migration in ichthyoplankton is relevant for its survive and it has been documented in estuaries with more than 10 m depth. In shallow estuaries this process is unknow or not supposed since no environmental stratification is assumed. The objective of this research is to investigate the vertical variability of fish larvae assemblages in shallow tropical estuarine zones. The model study site was the estuarine area of the San Pedro y San Pablo River located east of the Centla Wetland Biosphere Reserve in the Gulf of Mexico. The experimental design includes depth (bottom-surface), habitat type (coast-low complexity and mangrove-high complexity), circadian cycle (sunrise–midday– sunset–night), and season (dry-rainy). The ichthyoplankton were collected using a supporting net (150 cm in length, 50 cm mouth diameter, 400 μm mesh size) device for simultaneous collection on the surface and bottom. Circular tows (2.7–4 km/h) were carried out for 5 min. A total of 40,968 fish larvae were collected, belonging to 13 orders, 26 families, and 38 species. The highest larval abundance expressed as mean density (693 ± 916 ind/m³), richness (4.57 ± 3.46), Shannon-Wiener diversity (1.05 ± 48.48), and Pielou evenness (0.88 ± 0.3) were recorded in the bottom. The variance component analysis indicated that the most important factors to explain the larval abundance was the depth (15.55%), the period of the day (11.20 %) and the interaction between all factors (10.51 %). Fish larvae species as Achirus lineatus, Trinectes maculatus, Etropus crossotus, and Symphurus civitatium occupied only the bottom. Despite the low depth, a vertical stratification was observed in the physicochemical parameters, especially in the salinity, being greater in the bottom than in the surface during the two seasons and habitat type and it was related with higher values of abundance, richness, and diversity of ichthyoplankton. eng

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