Population structure of Uca spp. In a modified mangrove in Venezuela.

MARÍA F. HERNÁNDEZ GUERRA

LAP Lambert Academic Publishing

Lugar: Beau bassin; Año: 2020 p. 61

978-620-2-92120-6

The populations of Uca spp. in two areas associated with an anthropogenic modification in the mangrove swamp of Punta de Palmas, Zulia state, Venezuela. For this, 2 transects of 60 m were established in two areas of the mangrove divided by the breakwater in three sampling points, the organisms were collected by means of nucleators and by means of capture per unit of effort (CPUE), while measuring the temperature and salinity of the water, the granulometry and organic matter of the sediments. A total of 99 individuals were collected between both areas, 95 using the CPUE technique and 4 using the nucleator. The results obtained show the presence of three populations: Uca vocator, Uca rapax and Uca thayeri. No significant differences (p> 0.05) were found in the total abundance of Uca spp. Between the zones, however, if there was a difference in the populations of U. vocator and U. thayeri. Likewise, U. vocator was shown almost entirely towards the north and being the first most abundant with 72.9%, presenting a Shell Width (SW) of 23.3 mm, which represented the largest size for the area in particular. On the other hand, U. thayeri leaned towards the southern zone, with 22.2 mm (SW) representing the largest size for this zone. A higher proportion of males was evidenced with respect to all species. The two mangrove zones present characteristics among the studied physicochemical variables, such as salinity, organic matter and sediment (silt and clay), which are used according to the needs of these species, creating a margin of restriction between these populations. U. vocator was shown almost in its entirety towards the north zone and being the first most abundant with 72.9%, presenting a Shell Width (SW) of 23.3 mm that represented the largest size for the particular zone. On the other hand, U. thayeri leaned towards the southern zone, with 22.2 mm (SW) representing the largest size for this zone. A higher proportion of males was evidenced with respect to all species. The two mangrove zones present characteristics among the studied physicochemical variables, such as salinity, organic matter and sediment (silt and clay), which are used according to the needs of these species, creating a margin of restriction between these populations. U. vocator was shown almost in its entirety towards the north zone and being the first most abundant with 72.9%, presenting a Shell Width (SW) of 23.3 mm that represented the largest size for the particular zone. On the other hand, U. thayeri leaned towards the southern zone, with 22.2 mm (SW) representing the largest size for this zone. A higher proportion of males was evidenced with respect to all species. The two mangrove zones present characteristics among the studied physicochemical variables, such as salinity, organic matter and sediment (silt and clay), which are used according to the needs of these species, creating a margin of restriction between these populations. 3 mm which represented the largest size for the particular area. On the other hand, U. thayeri leaned towards the southern zone, with 22.2 mm (SW) representing the largest size for this zone. A higher proportion of males was evidenced with respect to all species. The two mangrove zones present characteristics among the studied physicochemical variables, such as salinity, organic matter and sediment (silt and clay), which are used according to the needs of these species, creating a margin of restriction between these populations.