The North American invasive zooplanktivore Bythotrephes longimanus is less hypoxia-tolerant than the native Leptodora kindtii
The North American invasive zooplanktivore Bythotrephes longimanus is less hypoxia-tolerant than the native Leptodora kindtii
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北美入侵浮游动物 Bythotrephes longimanus 的耐缺氧能力低于本地 Leptodora kindtii
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
D. Branstrator
中科院分区：
文献类型：
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作者：
Michael Sørensen;D. Branstrator
自 20 世纪 80 年代初以来，掠食性枝角动物 Bythotrephes longimanus（刺水蚤）一直在入侵北美中部地区的湖泊并破坏食物网。为了了解其生态位以及分类学相关的本地捕食性枝角动物 Leptodora kindtii 的生态位，我们研究了在实验室中暴露于低溶解氧 (DO) 浓度 12 小时后物种的存活情况。 Bythotrephes longimanus (n = 690) 的缺氧耐受极限 (LC50) 为 1.65 mg·L−1 DO（95% 置信区间：1.59, 1.72 mg·L−1），其缺氧耐受性显着低于 L. kindtii (n = 380)，后者的 LC50 为 0.58 mg·L−1 DO (0.51, 1.72 mg·L−1)。 0.65毫克·L−1)。这些基于实验室的生理结果与景观规模的观察结果一致，即 B. longimanus 成功入侵主要是中营养和寡营养湖泊，而 L. kindtii 栖息在更广泛的湖泊中，包括富营养湖泊。整个21世纪的气候变化可能会增加这种情况的发生和严重程度...
The predatory cladoceran Bythotrephes longimanus (spiny water flea) has been invading lakes and damaging food webs across the central part of North America since the early 1980s. To understand its niche and that of the taxonomically related and native predatory cladoceran Leptodora kindtii, we investigated species survival after 12 h exposures to low dissolved oxygen (DO) concentrations in the laboratory. Bythotrephes longimanus (n = 690) exhibited a hypoxia tolerance limit (LC50) of 1.65 mg·L−1 DO (95% confidence interval: 1.59, 1.72 mg·L−1) and was significantly less tolerant of hypoxia than L. kindtii (n = 380), which exhibited an LC50 of 0.58 mg·L−1 DO (0.51, 0.65 mg·L−1). These lab-based physiological results are consistent with landscape-scale observations that B. longimanus successfully invades primarily mesotrophic and oligotrophic lakes, while L. kindtii inhabits a wider range of lakes that includes eutrophic ones. Climate change throughout the 21st century may increase the occurrence and severit...