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首页> 外文期刊>Harmful Algae >A bloom of Lyngbya majuscula in Shoalwater Bay, Queensland, Australia: An important feeding ground for the green turtle (Chelonia mydas)
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A bloom of Lyngbya majuscula in Shoalwater Bay, Queensland, Australia: An important feeding ground for the green turtle (Chelonia mydas)

机译：澳大利亚昆士兰浅滩湾的Lyngbya majuscula盛开：绿海龟（Chelonia mydas）的重要觅食地

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摘要

Lyngbya majuscula, a toxic cyanobacterium, was observed blooming during June-July (winter) 2002 in Shoalwater Bay, Queensland, Australia, an important feeding area for a large population of green turtles (Chelonia mydas). The bloom was mapped and extensive mats of L. majuscula were observed overgrowing seagrass beds along at least 18 km of coast, and covering a surface area of more than 11 km~2. Higher than average rainfall preceded the bloom and high water temperatures in the preceding summer may have contributed to the bloom. In bloom samples, lyngbyatoxin A (LA) was found to be present in low concentration (26 μg kg~(-1)_((dry weight))), but debromoaplysiatoxin (DAT) was not detected. The diet of 46 green turtles was assessed during the bloom and L. majuscula was found in 51% of the samples, however, overall it contributed only 2% of the animals' diets. L. majuscula contribution to turtle diet was found to increase as the availability of the cyanobacterium increased. The bloom appeared to have no immediate impact on turtle body condition, however, the presence of a greater proportion of damaged seagrass leaves in diet in conjunction with decreases in plasma concentrations of sodium and glucose could suggest that the turtles may have been exposed to a substandard diet as a result of the bloom. This is the first confirmed report of L. majuscula blooming in winter in Shoalwater Bay, Queensland, Australia and demonstrates that turtles consume the toxic cyanobacterium in the wild, and that they are potentially exposed to tumour promoting compounds produced by this organism.
机译：2002年6月至7月（冬季），澳大利亚昆士兰的Shoalwater湾发现了有毒的蓝细菌Lyngbya majuscula盛开，那里是大量绿海龟（Chelonia mydas）的重要觅食区。绘制了水华，并观察到至少在沿海18 km处海藻床层上生长着巨大的金合欢席，覆盖面积超过11 km〜2。花开之前降雨量高于平均水平，并且前一个夏季的高温水可能导致了花开。在盛开的样品中，发现lyngbyatoxin A（LA）的浓度很低（26μgkg〜（-1）_（（干重））），但未检出溴代解磷毒素（DAT）。在开花过程中评估了46只绿海龟的饮食，在51％的样品中发现了金刚鹦鹉，但总体而言，它只占动物饮食的2％。随着蓝藻的可利用性的增加，发现金龟草对乌龟饮食的贡献增加。水华似乎对乌龟的身体状况没有立即的影响，但是，饮食中存在更大比例的受损海草叶以及血浆钠和葡萄糖的浓度降低可能表明乌龟可能暴露于不合格的环境中。因花开而节食。这是澳大利亚冬季昆士兰Shoalwater湾盛产的猕猴桃的第一个确证报告，表明乌龟在野外消耗有毒的蓝细菌，而且它们可能与这种生物体产生的促肿瘤化合物接触。

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