Luz J R, Boehs G
Programa de Pós-Graduação em Zoologia, Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz – UESC, Rod. Ilhéus-Itabuna, Km 16, CEP 45650-900, Ilhéus, BA, Brazil.
Braz J Biol. 2011 Aug;71(3):679-86. doi: 10.1590/s1519-69842011000400012.
The aim of this study was to characterize the reproductive cycle of Anomalocardia brasiliana, typical of the estuarine region of the Cachoeira River, Ilhéus, Bahia, Brazil. For this purpose, 20 specimens were collected biweekly between August 2005 and August 2006 on an intertidal bank (14º 48' 23" S and 39º 02' 47" W). The animals were measured on the anteroposterior axis (length), examined macroscopically and removed from the shell and fixed in Davidson's solution. Subsequently, the tissues were impregnated in paraffin, cut into 7 mm sections and stained with Harris hematoxylin and eosin (HE). The slides were examined under a light microscope. The water temperature at the site ranged from 24 to 30.5 ºC (mean: 27.4 ºC; SD ± 1.9), salinity from zero to 23 (mean: 13.7; SD ± 7.5) and rainfall from 28.3 mm to 248.8 mm monthly (yearly mean: 130 mm). The sample (n = 478) showed a sex ratio (M: F) of 1: 1.2 (p < 0.05) and no cases of hermaphroditism. There was no sexual dimorphism. Males and females showed reproductive synchrony. The reproductive cycle was continuous, with releases of gametes mainly in spring, summer and autumn. These results are similar to those found in other regions, but there was no reproductive rest period as reported for populations in higher latitudes.
本研究的目的是描述巴西巴伊亚州伊列乌斯市卡舒埃拉河河口地区典型的巴西偏顶蛤的繁殖周期。为此，于2005年8月至2006年8月期间每两周在潮间带滩涂（南纬14º 48' 23"，西经39º 02' 47"）采集20个样本。对动物的前后轴（长度）进行测量，进行宏观检查，然后从壳中取出并固定在戴维森溶液中。随后，将组织浸入石蜡中，切成7毫米的切片，并用苏木精-伊红（HE）染色。在光学显微镜下检查玻片。该地点的水温范围为24至30.5 ºC（平均：27.4 ºC；标准差±1.9），盐度范围为0至23（平均：13.7；标准差±7.5），月降雨量范围为28.3毫米至248.8毫米（年平均：共130毫米）。样本（n = 478）的性别比（雄：雌）为1:1.2（p < .05），未发现雌雄同体现象。不存在性别二态性。雄性和雌性表现出繁殖同步性。繁殖周期是连续的，配子主要在春季、夏季和秋季释放。这些结果与其他地区的结果相似，但没有像高纬度地区种群那样的繁殖休止期。
