Medeiros E L, Fernandes G V, Henry-Silva G G
Departamento de Ciências Animais, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil.
Laboratório de Limnologia e Qualidade de Água, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil.
Braz J Biol. 2015 Nov;75(4):914-22. doi: 10.1590/1519-6984.02714. Epub 2015 Nov 10.
This study evaluated the spatial and temporal distribution and density of the bivalve Donax striatus, at beaches close to the Apodi/Mossoró River estuary, through, six semiannual sampling campaigns were performed between April/2009 and October/2011. The sampled area was delimited by 20 transects that were laid perpendicular to the beach line and extended over 300 m in the intertidal zone. Seven sampling points were established in each transect, organisms and sediment were collected, and water temperature and salinity were recorded. The highest D. striatus average density (103 individuals.m-2) was observed in April/2009 and the lowest (18 individuals.m-2) in October/2010. The highest D. striatus densities occurred in beaches further from the estuarine region as demonstrated by a significant positive correlation (r2 = 0.67 and p = 0.0007). The D. striatus densities presented significant negative correlations with the percentages of organic matter in the water. This species demonstrated an aggregated distribution in the studied area.
本研究评估了靠近阿波迪/莫索罗河河口的海滩上双壳贝类条纹多纳克斯的空间和时间分布及密度，在2009年4月至2011年10月期间进行了六次半年一次的采样活动。采样区域由20条垂直于海滩线设置并在潮间带延伸300米的样带划定。每条样带设置七个采样点，采集生物和沉积物，并记录水温与盐度。条纹多纳克斯的平均密度最高值（103个个体/平方米）出现在2009年4月，最低值（18个个体/平方米）出现在2010年10月。条纹多纳克斯的最高密度出现在离河口区域较远的海滩，这表现为显著的正相关（r2 = 0.67，p = 0.0007）。条纹多纳克斯的密度与水中有机物百分比呈显著负相关。该物种在研究区域呈现聚集分布。
