Manzoor Syed Amir, Griffiths Geoffrey, Obiakara Maxwell C, Esparza-Estrada Citlalli Edith, Lukac Martin
School of Agriculture, Policy and Development University of Reading Reading UK.
Department of Forestry & Range Management FAS&T Bahauddin Zakariya University Multan Multan Pakistan.
Ecol Evol. 2020 Feb 11;10(4):2040-2050. doi: 10.1002/ece3.6036. eCollection 2020 Feb.
Biological invasions threaten global biodiversity and natural resources. Anticipating future invasions is central to strategies for combating the spread of invasive species. Ecological niche models are thus increasingly used to predict potential distribution of invasive species. In this study, we compare ecological niches of in its native (Iberian Peninsula) and invasive (Britain) ranges. Here, we test the conservation of ecological niche between invasive and native populations of using principal component analysis, niche dynamics analysis, and MaxEnt-based reciprocal niche modeling. We show that niche overlap between native and invasive populations is very low, leading us to the conclusion that the two niches are not equivalent and are dissimilar. We conclude that occupies novel environmental conditions in Britain. However, the evidence of niche shift presented in this study should be treated with caution because of nonanalogue climatic conditions between native and invasive ranges and a small population size in the native range. We then frame our results in the context of contradicting genetic evidence on possible hybridization of this invasive species in Britain. We argue that the existing contradictory studies on whether hybridization caused niche shift in are not sufficient to prove or disprove this hypothesis. However, we present a series of theoretical arguments which indicate that hybridization is a likely cause of the observed niche expansion of in Britain.
生物入侵威胁着全球生物多样性和自然资源。预测未来的入侵是应对入侵物种扩散策略的核心。因此，生态位模型越来越多地用于预测入侵物种的潜在分布。在本研究中，我们比较了[物种名称]在其原生范围（伊比利亚半岛）和入侵范围（英国）的生态位。在这里，我们使用主成分分析、生态位动态分析和基于最大熵的相互生态位建模，测试入侵种群和原生种群之间生态位的保守性。我们发现原生种群和入侵种群之间的生态位重叠非常低，由此得出结论，这两个生态位并不等同且存在差异。我们得出结论，[物种名称]在英国占据了新的环境条件。然而，由于原生范围和入侵范围之间的气候条件不相似，以及原生范围内的种群规模较小，本研究中提出的生态位转移证据应谨慎对待。然后，我们将研究结果置于与该入侵物种在英国可能杂交的遗传证据相矛盾的背景下进行阐述。我们认为，目前关于杂交是否导致[物种名称]生态位转移的相互矛盾的研究，不足以证明或反驳这一假设。然而，我们提出了一系列理论观点，表明杂交可能是观察到的[物种名称]在英国生态位扩张的原因。
