{"title":"Niche overlap with an exotic competitor mediates the abundant niche-centre relationship for a native lady beetle","authors":"Matthew J. Petersen, John E. Losey","doi":"10.1111/ddi.13825","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Aim</h3>\n \n <p>The abundant niche-centre hypothesis has been used to describe patterns of species abundance relative to position in ecological niche space. Such relationships, however, are inconsistently recovered and may be obscured due to non-equilibrium distributions, such as those caused novel interactions with exotic species. Here, we explore patterns of fitness for the nine-spotted lady (<i>Coccinella novemnotata</i>) following the introduction of an exotic competitor, the seven-spotted lady beetle (<i>C. septempunctata</i>). We examine how niche overlap between species may be causing a range reduction for <i>C. novemnotata</i> through a modified abundant niche-centre relationship.</p>\n </section>\n \n <section>\n \n <h3> Location</h3>\n \n <p>North America.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>We applied a time-oriented view of the abundant niche-centre relationship for <i>C. novemnotata</i>, both before and after the introduction of <i>C. septempunctata</i>. We tested for both niche overlap and correlation between <i>C. novemnotata</i> body size (i.e. fitness) and the distance from its niche centroid relative to the invasion status of <i>C. septempunctata</i>.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>The current niche space currently occupied by <i>C. novemnotata</i> is equivalent to its historic niche but has shifted to avoid overlap with <i>C. septempunctata</i>. A historic abundant niche-centre relationship with larger individuals closer to the niche centroid was observed for <i>C. novemnotata</i>. However, this pattern changed to have smaller beetles near the niche centroid when the current distribution was considered.</p>\n </section>\n \n <section>\n \n <h3> Main Conclusions</h3>\n \n <p>Fitness patterns displayed by <i>C. novemnotata</i> are effectively described by the abundant niche-centre hypothesis. However, this relationship was modified with the introduction of <i>C. septempunctata</i>. <i>Coccinella novemnotata</i> is not excluded from previously suitable areas that correspond to niche space nearest to its niche centroid. Abundant niche-centre relationships may provide strong predictions of species' fitness across a species geographic range; however, these relationships may be obscured by novel pressures resulting in non-equilibrium states.</p>\n </section>\n </div>","PeriodicalId":51018,"journal":{"name":"Diversity and Distributions","volume":"30 5","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ddi.13825","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Diversity and Distributions","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/ddi.13825","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"BIODIVERSITY CONSERVATION","Score":null,"Total":0}
引用次数: 0
Abstract
Aim
The abundant niche-centre hypothesis has been used to describe patterns of species abundance relative to position in ecological niche space. Such relationships, however, are inconsistently recovered and may be obscured due to non-equilibrium distributions, such as those caused novel interactions with exotic species. Here, we explore patterns of fitness for the nine-spotted lady (Coccinella novemnotata) following the introduction of an exotic competitor, the seven-spotted lady beetle (C. septempunctata). We examine how niche overlap between species may be causing a range reduction for C. novemnotata through a modified abundant niche-centre relationship.
Location
North America.
Methods
We applied a time-oriented view of the abundant niche-centre relationship for C. novemnotata, both before and after the introduction of C. septempunctata. We tested for both niche overlap and correlation between C. novemnotata body size (i.e. fitness) and the distance from its niche centroid relative to the invasion status of C. septempunctata.
Results
The current niche space currently occupied by C. novemnotata is equivalent to its historic niche but has shifted to avoid overlap with C. septempunctata. A historic abundant niche-centre relationship with larger individuals closer to the niche centroid was observed for C. novemnotata. However, this pattern changed to have smaller beetles near the niche centroid when the current distribution was considered.
Main Conclusions
Fitness patterns displayed by C. novemnotata are effectively described by the abundant niche-centre hypothesis. However, this relationship was modified with the introduction of C. septempunctata. Coccinella novemnotata is not excluded from previously suitable areas that correspond to niche space nearest to its niche centroid. Abundant niche-centre relationships may provide strong predictions of species' fitness across a species geographic range; however, these relationships may be obscured by novel pressures resulting in non-equilibrium states.
目的丰富生态位中心假说被用来描述物种丰度与生态位空间位置的相对关系。然而,这种关系的恢复并不一致,而且可能由于非平衡分布(如与外来物种的新型相互作用)而被掩盖。在此,我们探讨了九斑瓢虫(Coccinella novemnotata)在引入外来竞争者七斑瓢虫(C. septempunctata)后的适应性模式。我们研究了物种间的生态位重叠是如何通过改变丰富的生态位-中心关系而导致九斑瓢虫的分布范围缩小的。方法我们在引入七斑瓢虫之前和之后,对九斑瓢虫丰富的生态位-中心关系采用了以时间为导向的观点。我们检测了新栉水母的生态位重叠以及新栉水母的体型(即适应性)与其生态位中心点的距离与七带栉水母入侵状况之间的相关性。结果新栉水母目前占据的生态位空间与其历史生态位空间相当,但已发生变化,以避免与七带栉水母重叠。在 C. novemnotata 的生态位-中心关系中,观察到了历史上较大个体更靠近生态位中心的丰富生态位-中心关系。主要结论C. novemnotata的适生模式可以有效地用丰富的生态位中心假说来描述。然而,这种关系在引入 C. septempunctata 后有所改变。新月豚并没有被排除在与其生态位中心点最接近的生态位空间相对应的先前适宜区域之外。丰富的生态位-中心关系可以有力地预测物种在整个地理范围内的适应性;然而,这些关系可能会被导致非平衡状态的新压力所掩盖。
期刊介绍:
Diversity and Distributions is a journal of conservation biogeography. We publish papers that deal with the application of biogeographical principles, theories, and analyses (being those concerned with the distributional dynamics of taxa and assemblages) to problems concerning the conservation of biodiversity. We no longer consider papers the sole aim of which is to describe or analyze patterns of biodiversity or to elucidate processes that generate biodiversity.