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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Metamorphosis of mangrove crab megalopae, Ucides cordatus (Ocypodidae): Effects of interspecific versus intraspecifc settlement cues
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Metamorphosis of mangrove crab megalopae, Ucides cordatus (Ocypodidae): Effects of interspecific versus intraspecifc settlement cues

机译：红树林蟹巨蟹Ucides cordatus（Ocypodidae）的变态：种间和种内定居线索的影响

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It has recently been shown that metamorphosis of Ucides cordatus megalopae is triggered by substrata from the mangrove forest habitat, and, in particular, adult conspecific odours. Here we demonstrate that the gender of the odour-emitting crabs is insignificant for the metamorphic response in this species. We further investigate whether other estuarine crabs (Goniopsis cruentata, Uca spp., and Callinectes danae) also induce settlement and metamorphosis of U. cordatus megalopae. This is of special interest for population recovery in areas hit by lethargic crab disease (LCD), a fungus that selectively kills U. cordatus but not co-occurring species. Ucides megalopae were reared in four treatments with interspecific-conditioned seawater and tested against the effects of conspecific-conditioned seawater (positive control) and pure seawater (negative control). All megalopae in the positive control metamorphosed successfully, while only one (2%) moulted in the negative control, with a delay of 10 days compared with the latest metamorphosis in the former treatment. In seawater conditioned with U. maracoani and C. danae, which occur on sediment banks and in tidal creeks respectively, all larvae died before reaching the juvenile stage. In the treatments with odours of species that share the same mangrove forest microhabitat as U. cordatus, i.e. C. cruentata and a group of five fiddler crab species (mixed-odour treatment), 20 and 10% respectively of the megalopae moulted with a delay of up to 11 days. No specimens metamorphosed after day 39, but megalopae lived up to 93 days. Since only the conspecific- and coexisting-species treatments stimulated development, we hypothesize that Ucides megalopae are able to precisely identify species-habitat-specific settlement cues. This will be investigated in more detail in future studies, which will also test the effects of the odours of the five forest fiddler crab species separately. The impact of the interspecific odour treatments was much smaller than that of the conspecific odours, nevertheless elevated moulting rates of up to 18% relative to seawater may still significantly accelerate the repopulation of U. cordatus in areas lacking conspecifics, e.g. after massive crab mortalities or at first colonization.
机译：最近已显示，巨型红松伞菌的变态是由来自红树林栖息地的基质，尤其是成年同种异味触发的。在这里，我们证明了散发臭味的螃蟹的性别对于该物种的变态反应而言微不足道。我们进一步调查其他河口螃蟹（Goniopsis cruentata，Uca spp。和Callinectes danae）是否也诱导了巨型U. cordatus的沉降和变态。这对于嗜睡性蟹病（LCD）所致地区的人口恢复特别感兴趣，该病是一种真菌，它选择性地杀死脐带美丝藻而不是共生物种。用种间条件的海水在四种处理中饲养了巨节节藻，并测试了对种间条件的海水（阳性对照）和纯海水（阴性对照）的影响。阳性对照中的所有巨变均已成功变态，而阴性对照中仅有一个蜕变（2％），与前一种治疗中的最新变态相比，延迟了10天。在分别以U. maracoani和C. danae为条件的海水中，分别发生在沉积物库和潮汐小河上，所有幼虫在到达幼年期之前就死亡了。在具有与脐带藻相同的红树林微生境的物种的臭味处理中，即C. cruentata和一组五种招潮蟹物种（混合气味处理），分别有20％和10％的扇贝蜕变成延迟最多11天。第39天后没有变态的标本，但巨lop活到93天。由于只有特定物种和共存物种刺激了发育，因此我们假设巨型旋毛虫能够准确地识别特定物种栖息地的定居线索。将在以后的研究中对此进行更详细的研究，这还将分别测试5种森林提琴蟹物种的气味的影响。种间气味处理的影响比同种异味的影响要小得多，尽管如此，相对于海水而言，蜕皮率提高至18％仍可显着加速无形体区域如美国线虫的繁殖。在大量的螃蟹死亡或第一次定居之后。

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