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Temperature but not nutrient addition affects abundance and assemblage structure of colonizing aquatic insects
Ecology ( IF 4.4 ) Pub Date : 2020-11-04 , DOI: 10.1002/ecy.3209
Sarah C McNamara 1 , Matthew R Pintar 1 , William J Resetarits 1
Affiliation  

Abiotic conditions are important considerations in the species sorting process, which ultimately determines the distribution and abundance of species. Freshwater ecosystems will be impacted by ongoing temperature rise and other anthropogenically-induced changes, such as nutrient enrichment and eutrophication. Changing characteristics of freshwater habitats will likely impact organisms in numerous ways, including through effects on colonization dynamics. Species are expected to colonize habitat patches where fitness will be the highest for themselves and their offspring, and how habitat selection interacts with changing environments remains an important question. We conducted a warming experiment to test the habitat selection preferences of aquatic beetles and hemipterans between habitat patches (mesocosms) of varying temperatures (via heaters), nutrient addition, and their interaction. Overall, insect abundance and richness were higher in unheated patches, with taxon-specific variation in response to heating. Although nutrients had limited effects on environmental conditions in mesocosms, their addition had no significant effects on insects. Insect assemblages had unique structures across heating treatments, with lower beta diversity and higher effective numbers of species in the warmest mesocosms. Our data support the importance of spatial variation in abiotic factors during the habitat selection process, and in determining species distributions and abundances as shallow lentic ecosystems are impacted by rising global temperatures.

中文翻译:

温度而不是营养添加会影响定殖水生昆虫的丰度和组合结构

非生物条件是物种分类过程中的重要考虑因素,最终决定了物种的分布和丰度。淡水生态系统将受到持续的温度升高和其他人为引起的变化的影响,例如养分富集和富营养化。淡水栖息地特征的变化可能会以多种方式影响生物体,包括通过对殖民动态的影响。预计物种将在栖息地斑块上定居,那里的适应度对它们自己和它们的后代来说是最高的,栖息地选择如何与不断变化的环境相互作用仍然是一个重要的问题。我们进行了一项变暖实验,以测试水生甲虫和半翅目在不同温度(通过加热器)的栖息地斑块(中宇宙)之间的栖息地选择偏好,营养添加,以及它们的相互作用。总体而言,未加热的斑块中昆虫的丰度和丰富度较高,并且对加热有特定的分类变化。尽管营养物质对中宇宙环境条件的影响有限,但它们的添加对昆虫没有显着影响。昆虫组合在加热处理中具有独特的结构,在最温暖的中宇宙中具有较低的 β 多样性和较高的有效物种数量。我们的数据支持在栖息地选择过程中非生物因素的空间变化的重要性,以及在确定物种分布和丰度方面的重要性,因为浅层静息生态系统受到全球气温上升的影响。具有响应加热的特定分类群的变化。尽管营养物质对中宇宙环境条件的影响有限,但它们的添加对昆虫没有显着影响。昆虫组合在加热处理中具有独特的结构,在最温暖的中宇宙中具有较低的 β 多样性和较高的有效物种数量。我们的数据支持在栖息地选择过程中非生物因素的空间变化的重要性,以及在确定物种分布和丰度方面的重要性,因为浅层静息生态系统受到全球气温上升的影响。具有响应加热的特定分类群的变化。尽管营养物质对中宇宙环境条件的影响有限,但它们的添加对昆虫没有显着影响。昆虫组合在加热处理中具有独特的结构,在最温暖的中宇宙中具有较低的 β 多样性和较高的有效物种数量。我们的数据支持在栖息地选择过程中非生物因素的空间变化的重要性,以及在确定物种分布和丰度方面的重要性,因为浅层静息生态系统受到全球气温上升的影响。在最温暖的中宇宙中具有较低的β多样性和较高的有效物种数量。我们的数据支持在栖息地选择过程中非生物因素的空间变化的重要性,以及在确定物种分布和丰度方面的重要性,因为浅层静息生态系统受到全球气温上升的影响。在最温暖的中宇宙中具有较低的β多样性和较高的有效物种数量。我们的数据支持在栖息地选择过程中非生物因素的空间变化的重要性,以及在确定物种分布和丰度方面的重要性,因为浅层静息生态系统受到全球气温上升的影响。
更新日期:2020-11-04
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