Limited Migration From Physiological Refugia Constrains the Rescue of Native Gastropods Facing an Invasive Predator

IF 3.5 2区 生物学 Q1 EVOLUTIONARY BIOLOGY
Mathilde Salamon, Louis Astorg, Antoine Paccard, Frederic Chain, Andrew P. Hendry, Alison M. Derry, Rowan D. H. Barrett
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Abstract

Biological invasions have caused the loss of freshwater biodiversity worldwide. The interplay between adaptive responses and demographic characteristics of populations impacted by invasions is expected to be important for their resilience, but the interaction between these factors is poorly understood. The freshwater gastropod Amnicola limosus is native to the Upper St. Lawrence River and distributed along a water calcium concentration gradient within which high-calcium habitats are impacted by an invasive predator fish (Neogobius melanostomus, round goby), whereas low-calcium habitats provide refuges for the gastropods from the invasive predator. Our objectives were to (1) test for adaptation of A. limosus to the invasive predator and the low-calcium habitats, and (2) investigate if migrant gastropods could move from refuge populations to declining invaded populations (i.e., demographic rescue), which could also help maintain genetic diversity through gene flow (i.e., genetic rescue). We conducted a laboratory reciprocal transplant of wild F0 A. limosus sourced from the two habitat types (high calcium/invaded and low calcium/refuge) to measure adult survival and fecundity in home and transplant treatments of water calcium concentration (low/high) and round goby cue (present/absent). We then applied pooled whole-genome sequencing of 12 gastropod populations from across the calcium/invasion gradient. We identified patterns of life-history traits and genetic differentiation across the habitats that are consistent with local adaptation to low-calcium concentrations in refuge populations and to round goby predation in invaded populations. We also detected restricted gene flow from the low-calcium refugia towards high-calcium invaded populations, implying that the potential for demographic and genetic rescue is limited by natural dispersal. Our study highlights the importance of considering the potentially conflicting effects of local adaptation and gene flow for the resilience of populations coping with invasive predators.

Abstract Image

从生理避难所的有限迁移限制了本地腹足类面对入侵捕食者时的救援。
生物入侵造成了全球淡水生物多样性的丧失。受入侵影响的种群的适应性反应和人口特征之间的相互作用对其恢复能力很重要,但人们对这些因素之间的相互作用知之甚少。淡水腹足类动物 Amnicola limosus 原产于圣劳伦斯河上游,沿水钙浓度梯度分布,其中高钙栖息地受到入侵捕食鱼类(Neogobius melanostomus,圆鰕虎鱼)的影响,而低钙栖息地则为腹足类动物提供了躲避入侵捕食鱼类的庇护所。我们的目标是:(1)测试腹足类对入侵捕食者和低钙栖息地的适应性;(2)研究迁徙腹足类是否能从避难所种群迁移到衰退的入侵种群(即人口救援),这也有助于通过基因流维持遗传多样性(即遗传救援)。我们对来自两种生境类型(高钙/入侵和低钙/避难所)的野生F0.A. limosus进行了实验室对等移植,以测量在水钙浓度(低/高)和圆虾虎鱼线索(存在/不存在)的原生境和移植处理中成鱼的存活率和繁殖率。然后,我们对来自钙/入侵梯度的 12 个腹足类种群进行了集合全基因组测序。我们发现了不同栖息地的生活史特征和遗传分化模式,这些模式与避难所种群对低钙浓度的局部适应以及入侵种群对圆虾虎鱼捕食的适应是一致的。我们还发现,从低钙避难所向高钙入侵种群的基因流动受到限制,这意味着人口和基因拯救的潜力受到自然扩散的限制。我们的研究强调了考虑当地适应性和基因流对种群应对入侵捕食者的恢复能力的潜在冲突影响的重要性。
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来源期刊
Evolutionary Applications
Evolutionary Applications 生物-进化生物学
CiteScore
8.50
自引率
7.30%
发文量
175
审稿时长
6 months
期刊介绍: Evolutionary Applications is a fully peer reviewed open access journal. It publishes papers that utilize concepts from evolutionary biology to address biological questions of health, social and economic relevance. Papers are expected to employ evolutionary concepts or methods to make contributions to areas such as (but not limited to): medicine, agriculture, forestry, exploitation and management (fisheries and wildlife), aquaculture, conservation biology, environmental sciences (including climate change and invasion biology), microbiology, and toxicology. All taxonomic groups are covered from microbes, fungi, plants and animals. In order to better serve the community, we also now strongly encourage submissions of papers making use of modern molecular and genetic methods (population and functional genomics, transcriptomics, proteomics, epigenetics, quantitative genetics, association and linkage mapping) to address important questions in any of these disciplines and in an applied evolutionary framework. Theoretical, empirical, synthesis or perspective papers are welcome.
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