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蔗蟾大屠杀

(2011-09-03 09:06:41)
标签:

胡德良

蔗蟾

蝌蚪

化学物质

生物学快报

it

分类: 生命科学

蔗蟾大屠杀

Cane Toad Carnage

by Sarah C. P. Williams    胡德良

The biggest danger for a cane toad (Rhinella marina) egg isn't a predator of a different species; it's a cane toad tadpole. The tadpoles not only seek out and eat eggs, they also release chemicals into the water that stunt the growth of developing cane toad embryos, new research reveals. It's all part of an intense competition for resources. To study this phenomenon, scientists kept cane toad eggs with tadpoles in tanks and separated them with a mesh divider. When the eggs hatched, the new tadpoles were 11% shorter and 45% lighter than their siblings that developed in eggs that were kept alone. Additionally, the survival rate of the tadpole-exposed eggs was 40% lower, the team reports today in Biology Letters. The researchers haven't isolated the chemical responsible for dwarfing and killing the cane toads, but that's their next step. Such a compound could help control populations of cane toads in Australia, where they are considered an invasive species and threaten the diversity of native reptiles.    对于蔗蟾(Rhinella marina)产下的卵来说,最大的危险不是来自不同物种的掠食者,而是来自蔗蟾蝌蚪。新研究发现,蔗蟾蝌蚪不但找出蔗蟾卵把它们吃掉,而且往水中释放化学物质,阻碍蔗蟾胚胎的发育成长。这都是激烈竞争资源过程中的一个环节。为了研究这个现象,科学家们把蔗蟾卵和蔗蟾蝌蚪放在水箱里,利用带有网孔的隔离板隔开。今天,研究小组在《生物学快报》上报道说:当卵孵出的时候,新蝌蚪比单独存放的卵孵出的蝌蚪短11%,轻45%;此外,暴露于蝌蚪的卵存活率低40%。研究人员没有分离出使蔗蟾短小并杀死蔗蟾的化学物质,但那是他们下一步的工作。这中化学物质可能有助于控制澳大利亚蔗蟾群落的数量。在澳大利亚,蔗蟾被认为是一个进犯的物种,威胁着当地爬行动物的多样性。

  

 

译自:美国《科学》杂志网站(30 August 2011, 7:01 PM< xmlnamespace prefix ="o" ns ="urn:schemas-microsoft-com:office:office" />

原著:Sarah C. P. Williams

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