Predation by invasive Platydemus manokwari flatworms: a laboratory study

Q3 Agricultural and Biological Sciences Biological Letters Pub Date : 2019-06-01 DOI:10.2478/biolet-2019-0005
J. Gerlach
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引用次数: 8

Abstract

Abstract Platydemus manokwari de Beauchamp, 1963 is an invasive flatworm found on islands in the tropics, especially in the Pacific Ocean. It has been implicated in the decline of several snail populations, including the extinction of some Partula species. Its predatory behaviour was investigated to quantify predation rates and elucidate climatic influences. This laboratory study of the invasive flatworm confirms earlier reports that P. manokwari is a generalist predator of snails. It prefers small prey and avoids species defended by copious mucus, chemical defences or a tough integument. Prey are found by following damp mucus trails up to 15 h old. Flatworm activity is limited by temperature and humidity, with peak feeding at 24–30°C and 85–95% humidity. This determines the geographical spread of the species and probably also the effectiveness of arboreal predation. Aboveground air circulation leads to drying, reducing the ability of the flatworms to locate trails and remain active high off the ground. Local climatic factors may dictate how significantly P. manokwari affects snail populations.
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侵袭性马诺夸里扁虫的捕食:一项实验室研究
摘要Platydemus manokwari de Beauchamp,1963是一种入侵性扁虫,发现于热带岛屿,尤其是太平洋。它与一些蜗牛种群的减少有关,包括一些Partula物种的灭绝。对其捕食行为进行了调查,以量化捕食率并阐明气候影响。这项对入侵性扁虫的实验室研究证实了早期的报道,即曼诺夸里是一种多面手的蜗牛捕食者。它喜欢小型猎物,避免被大量粘液、化学防御或坚韧的表皮保护的物种。猎物是通过追踪15小时前潮湿的粘液踪迹而发现的。扁虫的活动受到温度和湿度的限制,高峰进食温度为24-30°C,湿度为85-95%。这决定了物种的地理分布,也可能决定了树栖捕食的有效性。地上空气循环导致干燥,降低了扁虫定位踪迹和在地面高处保持活跃的能力。当地气候因素可能决定了P.manokwari对蜗牛种群的影响有多大。
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Biological Letters
Biological Letters Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)
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期刊介绍: It covers a wide spectrum of biological disciplines, including animal science and zoology, general biochemistry, botany, and ecology. We also encourage submission of manuscripts related to conservation biology and wildlife management.
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