SEXUAL DIMORPHISM, ALLOMETRY, AND SIZE AT FIRST MATURITY OF THE CARIBBEAN KING CRAB, MITHRAX SPINOSISSIMUS, IN THE FLORIDA KEYS
SEXUAL DIMORPHISM, ALLOMETRY, AND SIZE AT FIRST MATURITY OF THE CARIBBEAN KING CRAB, MITHRAX SPINOSISSIMUS, IN THE FLORIDA KEYS
复制标题
DOI：
10.2983/035.031.0401
复制
发表时间：
2012-12-01
影响因子：
1.3
通讯作者：
Behringer, Donald C.
中科院分区：
文献类型：
--
作者：
Antonio Baeza, J.;Anderson, Joshua R.;Behringer, Donald C.
加勒比帝王蟹mithrrax spinosissimus是在西大西洋发现的最大的短尾蟹，它支持整个加勒比海和墨西哥湾的自给自足和小型商业渔业。由于其幼虫期短，生长迅速，被认为是水产养殖的良好候选者。本研究首次记录了来自美国佛罗里达州佛罗里达群岛的雄性和雌性棘骨鼠某些第二性征的性成熟大小、两性二态性和相对于甲壳宽度的异速生长。通过主成分分析、k均值聚类分析和判别分析，我们确定了该物种幼虫后底栖生活的两个主要生长阶段（幼年或青春期前和成年或青春期）。大型蟹的典型生长模式包括第三个中期生长阶段，而棘蟹则没有。雄性的主螯大于雌性，成熟后呈正异速生长，成熟后异速生长水平下降。雌性两足动物在个体发育过程中均表现出正异速生长。在整个个体发育过程中，雄性的腹部宽度呈负异速生长，而雌性的腹部在生殖成熟之前呈正异速生长，此时腹部宽度变为等长。Logistic回归结果表明，雄、雌初成熟时甲壳宽度分别为45.2 mm和69.7 mm。如果要可持续地管理这一渔业，在评估种群和制定捕捞条例时应考虑到这一新的资料。
The Caribbean King crab Mithrax spinosissimus is the largest brachyuran found in the western Atlantic and it supports subsistence and small commercial fisheries throughout the Caribbean and Gulf of Mexico. Because of its short larval duration and rapid growth, M. spinosissimus is considered a good candidate for aquaculture. Out study documents for the first time the size at sexual maturity, sexual dimorphism, and allometric growth relative to carapace width for certain secondary sexual characters in male and female M. spinosissimus from the Florida Keys, Florida. Using principal component analysis, K-means cluster analysis, and discriminant analysis, we identified 2 major growth phases in the postlarval benthic life of this species (juvenile or prepubertal and adult or pubertal). The typical growth pattern for majoid crabs includes a third, intermediate growth phase that appears absent in M. spinosissimus. The major cheliped of males was larger than that of females and exhibited positive allometric growth to maturity, after which the level of allometry decreased. In females, both chelipeds exhibited positive allometry throughout ontogeny. Abdominal width was negatively allometric throughout ontogeny in males, whereas in females the abdomen exhibited positive allometric growth until reproductive maturity, at which point it became isometric. Logistic regression indicated that the carapace width at first maturity was 45.2 mm in males and 69.7 mm in females. This new information should be taken into account when assessing stocks and setting harvest regulations if this fishery is to be managed sustainably.