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首页> 外文期刊>Journal of Biogeography >Disequilibrial island turnover dynamics: a 17-year record of Bahamian ants
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Disequilibrial island turnover dynamics: a 17-year record of Bahamian ants

机译：不平衡的岛屿周转动态：巴哈马蚂蚁的17年记录

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To document long-term rates of immigration, extinction and turnover in insular ant faunas and evaluate the relative impacts of recent hurricane activity and climate change. Small islands in the Exuma Cays, Andros and Abaco archipelagos of the Bahamas. I surveyed the ant faunas of > 140 small islands in three archipelagos of the Bahamas over several multi-year periods, spanning up to 17 years, by recording species attracted to baits. Immigrations, extinctions and species turnover were documented, as were the relative abundances of species. Four major hurricanes affected the study archipelagos in the second decade of this study. Rates of ant turnover were generally low among archipelagos and time periods. Immigrations outnumbered extinctions in the first decade of this study, although this pattern was reversed in the second decade. General physical characteristics of the islands were not significant predictors of the occurrence of extinctions. The relative abundance (based on proportion of baits occupied) of persistent populations of the two most common species both declined in the second decade, indicating, along with higher extinction rates, a generalized decline in these insular ant faunas. The available evidence suggests that hurricanes were not directly responsible for the observed declines in the ant faunas. Regional changes in insular ant species richness, however, are correlated with generalized North Atlantic hurricane activity over the last half century. Indirect effects of hurricanes on the vegetation of these islands, such as increased herbivory and possible decreased nutrient availability, along with a long-term (quarter century) increase in temperature and decline in rainfall, are possible contributing factors to the changing ant turnover dynamics.
机译：记录离岛蚂蚁动物的长期迁徙，灭绝和周转率，并评估近期飓风活动和气候变化的相对影响。巴哈马群岛埃克苏马岛，安德罗斯岛和阿巴科群岛的小岛。我通过记录被诱饵吸引的物种，调查了长达数年（长达17年）的巴哈马群岛三个群岛中140多个小岛的蚂蚁动物区系。记录了移民，物种灭绝和物种更新，以及物种的相对丰富度。在本研究的第二个十年中，四个主要飓风影响了该群岛。在各群岛和各时期，蚂蚁周转率普遍较低。在本研究的第一个十年中，移民数量超过了灭绝物种数量，尽管在第二个十年中这种情况得到了扭转。岛屿的一般物理特征并不是灭绝发生的重要预测指标。两个最常见物种的持久种群的相对丰度（基于所占诱饵的比例）在第二个十年都下降了，这表明，随着更高的灭绝率，这些孤立的蚂蚁动物群也普遍下降。现有证据表明，飓风与观察到的蚂蚁动物群减少没有直接关系。然而，在过去的半个世纪中，岛屿蚂蚁物种丰富度的区域变化与北大西洋飓风的普遍活动有关。飓风对这些岛屿植被的间接影响，例如草食动物的增加和可能的养分利用率的降低，以及长期（四分之一世纪）温度的升高和降雨的减少，可能是导致蚂蚁周转动态变化的因素。

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