Fecundity of the exotic applesnail, Pomacea insularum
Fecundity of the exotic applesnail, Pomacea insularum
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DOI：
10.1899/08-013.1
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发表时间：
2008-09-01
影响因子：
--
通讯作者：
Hand, Jennifer J.
中科院分区：
文献类型：
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作者：
Barnes, Matthew A.;Fordham, Rebecca K.;Hand, Jennifer J.
国际贸易经常使软体动物在全球范围内移动，从而增加了它们造成生态和经济破坏的机会。最近的遗传研究已经证实了美国东南部的南美苹果指甲（Pomacea insularum）的身份，但关于该物种的文献有限。了解繁殖力可以直接了解软体动物的入侵潜力。我们的研究记录了P. insularum在德克萨斯州的繁殖力，并与密切相关的全球入侵者P. canaliculata进行了比较。我们量化了岛螺的孵化和孵化的物理特征，并检查了野外和实验室的孵化成功率。每窝含有数千个蛋（平均为2064个蛋），而且每窝的大小在繁殖季节有增加的趋势。野外和实验室的平均孵化率（孵化数/总卵数）分别接近70%和30%。值得注意的是，在野外，有几窝蛋的孵化率为80%或更高。外来的岛叶瓢虫比外来的管状瓢虫产卵量更多，但我们还不知道它们的季节孵化效率如何。然而，即使保守估计只有1%到10%的成活率，平均每窝岛螺也能产出14到144个新苹果钉。在美国东南部，由于成年雌性在一个延长的生长季节中可以贡献100多窝/周，因此岛蕨的高繁殖力转化为相当大的生态影响。随着在脆弱的佛罗里达大沼泽地中出现的岛草种群，研究的需求增加了。我们提倡像我们这样的生活史研究，以帮助了解苹果指甲和其他入侵软体动物的入侵潜力。
International trade frequently moves mollusks around the globe, thereby increasing their opportunity to Cause ecological and economic damage. Recent genetic studies have confirmed the identity of South American applesnails (Pomacea insularum) in the southeastern US, but limited literature exists on this species. Understanding fecundity provides direct insight into the invasive potential of mollusks. Our study documents P. insularum fecundity in Texas and offers comparisons with the closely related global invader P. canaliculata. We quantified P. insularum clutch and hatchling physical characteristics and examined field and laboratory hatching success. Clutches contained thousands of eggs (mean = 2064 eggs), and clutch size tended to increase over the reproductive season. Clutches exhibited average field and laboratory hatching efficiencics (number of hatchlings/total number of eggs) near 70 and 30%, respectively. Notably, several clutches hatched at 80% or higher in the field. Exotic P. insularum deposit more eggs/clutch than the related invader P. canaliculata, but we do not yet know how seasonal hatching efficiencies compare. However, even with a conservative estimate of 1 to 10% survival to adulthood, the average P. insularum clutch yields 14 to 144 new applesnails. The high fecundity of P. insularum translates into considerable ecological impact because adult females can contribute >1 clutch/wk over an extended growing season in the southeastern US. The need for research has increased with the emergence of P. insularum populations in the fragile Florida Everglades. We advocate life-history studies like ours to help understand the invasion potential of applesnails and other invasive mollusks.