Effects of Cadmium on Somatic and Gonadal Growth of Juvenile Females of the Estuarine Crab Chasmagnathus Granulata (Brachyura: Grapsidae)

鎘處理對幼態雌性粒狀張口蟹生長與性腺發育之影響

Mariela Kogan ； Laura S. López Greco ； Luis A. Romano ； Enrique M. Rodriguez

《Zoological Studies》 39卷4期 (2000/10) Pp. 344-350

摘要

幼態雌性粒狀張口蟹，在蛻皮前50天及蛻皮期間15天以鎘處理(0.1及0.5mg/l)。其性腺經切除、固定後作組織病理檢查、並定量其背甲之鈣含量。蛻皮前之幼態雌蟹經0.5mg/l鎘處理後，多數致死，僅少數存活並蛻皮。在0.1mg/l鎘處理後，大部分螃蟹可存活並蛻皮，但其性腺比對照組呈現顯著病變，包括初級卵母細胞肥大、破裂及次級卵母細胞萎縮。經0.1mg/l鎘處理後，在蛻皮後其卵巢無明顯病變，但性成熟顯著延緩。

關鍵字

鎘 ； 卵巢 ； 甲殼類 ； 性成熟

並列摘要

Juvenile female crabs of Chasmagnathus granulata (Decapoda: Brachyura) were exposed to 0.1 and 0.5 mg/l of cadmium for at least 50 d before and 15 d after molting. The gonads were dissected and fixed for histopathological studies, while the carapaces were preserved to measur calcium content. A cadmium concentration of 0.5 mg/l was lethal for juvenile crabs. The few surviving crabs at this concentration were unable to molt. Althougth most crabs exposed to 0.1 mg/l of cadmium survived and molted, they presented a significantly higher incidence of pathologies in the ovaries than did control crabs. These pathologies were hypertrophy and cariorhexis in primary oocytes, as well as reactional atresia in secondary oocytes. Although no significant difference in the primary oocytes, as well as reactional atresia in secondary oocytes. Although no significant difference in the proportion of crabs with mature ovaries after molting was noted between the control and cadmium-exposed animals, a trend towards slower maturity was noticed due to the effect of cadmium.

並列關鍵字

Cadmium ； Ovary ； Crustaceans ； Sexual maturity