American Naturalist最新文献_第8页

Fertilization Mode Covaries with Body Size. 受精模式与体型相关。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-31 DOI: 10.1086/725864

George C Jarvis, Dustin J Marshall

引用次数: 1

The Contribution of Mutation to Variation in Temperature-Dependent Sprint Speed in Zebrafish, Danio rerio. 突变对斑马鱼温度依赖性冲刺速度变化的贡献。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-31 DOI: 10.1086/726011

Christina L Miller, Derek Sun, Lauren H Thornton, Katrina McGuigan

{"title":"The Contribution of Mutation to Variation in Temperature-Dependent Sprint Speed in Zebrafish, Danio rerio.","authors":"Christina L Miller, Derek Sun, Lauren H Thornton, Katrina McGuigan","doi":"10.1086/726011","DOIUrl":"10.1086/726011","url":null,"abstract":"AbstractThe contribution of new mutations to phenotypic variation and the consequences of this variation for individual fitness are fundamental concepts for understanding genetic variation and adaptation. Here, we investigated how mutation influenced variation in a complex trait in zebrafish, Danio rerio. Typical of many ecologically relevant traits in ectotherms, swimming speed in fish is temperature dependent, with evidence of adaptive evolution of thermal performance. We chemically induced novel germline point mutations in males and measured sprint speed in their sons at six temperatures (between 16°C and 34°C). Heterozygous mutational effects on speed were strongly positively correlated among temperatures, resulting in statistical support for only a single axis of mutational variation, reflecting temperature-independent variation in speed (faster-slower mode). These results suggest pleiotropic effects on speed across different temperatures; however, spurious correlations arise via linkage or heterogeneity in mutation number when mutations have consistent directional effects on each trait. Here, mutation did not change mean speed, indicating no directional bias in mutational effects. The results contribute to emerging evidence that mutations may predominantly have synergistic cross-environment effects, in contrast to conditionally neutral or antagonistic effects that underpin thermal adaptation. We discuss several aspects of experimental design that may affect resolution of mutations with nonsynergistic effects.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"519-533"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41138444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Revisiting the Role of Genetic Variation in Adaptation. 重新审视遗传变异在适应中的作用。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-09-07 DOI: 10.1086/726012

Deepa Agashe, Mrudula Sane, Shivansh Singhal

{"title":"Revisiting the Role of Genetic Variation in Adaptation.","authors":"Deepa Agashe, Mrudula Sane, Shivansh Singhal","doi":"10.1086/726012","DOIUrl":"10.1086/726012","url":null,"abstract":"AbstractEvolutionary biologists have thought about the role of genetic variation during adaptation for a very long time-before we understood the organization of the genetic code, the provenance of genetic variation, and how such variation influenced the phenotypes on which natural selection acts. Half a century after the discovery of the structure of DNA and the unraveling of the genetic code, we have a rich understanding of these problems and the means to both delve deeper and widen our perspective across organisms and natural populations. The 2022 Vice Presidential Symposium of the American Society of Naturalists highlighted examples of recent insights into the role of genetic variation in adaptive processes, which are compiled in this special section. The work was conducted in different parts of the world, included theoretical and empirical studies with diverse organisms, and addressed distinct aspects of how genetic variation influences adaptation. In our introductory article to the special section, we discuss some important recent insights about the generation and maintenance of genetic variation, its impacts on phenotype and fitness, its fate in natural populations, and its role in driving adaptation. By placing the special section articles in the broader context of recent developments, we hope that this overview will also serve as a useful introduction to the field.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"486-502"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41163013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Population Regulation and Density-Dependent Demography in the Trinidadian Guppy. 特立尼达古皮的人口调节和密度相关人口学。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-15 DOI: 10.1086/725796

Joseph Travis, Ronald D Bassar, Tim Coulson, Andres Lopez-Sepulcre, David Reznick

{"title":"Population Regulation and Density-Dependent Demography in the Trinidadian Guppy.","authors":"Joseph Travis, Ronald D Bassar, Tim Coulson, Andres Lopez-Sepulcre, David Reznick","doi":"10.1086/725796","DOIUrl":"10.1086/725796","url":null,"abstract":"AbstractClassic theory for density-dependent selection for delayed maturation requires that a population be regulated through some combination of adult fecundity and/or juvenile survival. We tested whether those demographic conditions were met in four experimental populations of Trinidadian guppies in which delayed maturation of males evolved when the densities of those populations became high. We used monthly mark-recapture data to examine population dynamics and demography in these populations. Three of the four populations displayed clear evidence of regulation. In all four populations, monthly adult survival rates were independent of biomass density or actually increased with increased biomass density. Juvenile recruitment, which is a combination of adult fecundity and juvenile survival, decreased as biomass density increased in all four populations. Demography showed marked seasonality, with greater survival and higher recruitment in the dry season than the wet season. Population regulation via juvenile recruitment supports the hypothesis that density-dependent selection was responsible for the evolution of delayed maturity in males. This body of work represents one of the few complete tests of density-dependent selection theory.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"413-432"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41162522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Front and Back Matter 正面和背面

2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 DOI: 10.1086/728073

引用次数: 0

Whole-Genome Sequencing Reveals That Regulatory and Low Pleiotropy Variants Underlie Local Adaptation to Environmental Variability in Purple Sea Urchins. 全基因组测序揭示了调节性和低倍性变异是紫海龙局部适应环境变异的基础。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-23 DOI: 10.1086/726013

Csenge Petak, Lapo Frati, Reid S Brennan, Melissa H Pespeni

{"title":"Whole-Genome Sequencing Reveals That Regulatory and Low Pleiotropy Variants Underlie Local Adaptation to Environmental Variability in Purple Sea Urchins.","authors":"Csenge Petak, Lapo Frati, Reid S Brennan, Melissa H Pespeni","doi":"10.1086/726013","DOIUrl":"10.1086/726013","url":null,"abstract":"AbstractOrganisms experience environments that vary across both space and time. Such environmental heterogeneity shapes standing genetic variation and may influence species' capacity to adapt to rapid environmental change. However, we know little about the kind of genetic variation that is involved in local adaptation to environmental variability. To address this gap, we sequenced the whole genomes of 140 purple sea urchins (Strongylocentrotus purpuratus) from seven populations that vary in their degree of pH variability. Despite no evidence of global population structure, we found a suite of single-nucleotide polymorphisms (SNPs) tightly correlated with local pH variability (outlier SNPs), which were overrepresented in regions putatively involved in gene regulation (long noncoding RNA and enhancers), supporting the idea that variation in regulatory regions is important for local adaptation to variability. In addition, outliers in genes were found to be (i) enriched for biomineralization and ion homeostasis functions related to low pH response, (ii) less central to the protein-protein interaction network, and (iii) underrepresented among genes highly expressed during early development. Taken together, these results suggest that loci that underlie local adaptation to pH variability in purple sea urchins fall in regions with potentially low pleiotropic effects (based on analyses involving regulatory regions, network centrality, and expression time) involved in low pH response (based on functional enrichment).","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"571-586"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41123267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The Past Contribution and Future Fate of Genetic Variants under Climate Change in an Island Population of Musa itinerans. 气候变化下穆萨巡回岛种群遗传变异的过去贡献和未来命运。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-24 DOI: 10.1086/726015

Ya-Ping Lin, Cheng-Yueh Lu, Cheng-Ruei Lee

{"title":"The Past Contribution and Future Fate of Genetic Variants under Climate Change in an Island Population of Musa itinerans.","authors":"Ya-Ping Lin, Cheng-Yueh Lu, Cheng-Ruei Lee","doi":"10.1086/726015","DOIUrl":"10.1086/726015","url":null,"abstract":"AbstractGenetic variation within species is crucial for sessile species to adapt to novel environments when facing dramatic climate changes. However, the debate continues whether standing ancestral variation adaptive to current environmental variability is sufficient to guarantee future suitability. Using wild banana Musa itinerans, we investigated the relative contribution of standing ancestral variation versus new mutations to environmental adaptation and inferred their future fate. On the continental island of Taiwan, local populations immigrated from the Southeast Asian continent during the ice age and have been isolated since then. This allows the classification of genetic variants into standing ancestral variation (polymorphic in Taiwan and the continent) and new mutations (polymorphic only in Taiwan). For temperature-related variables where Taiwan is mainly within the ancestral climatic range, standing ancestral variation had a slightly stronger association than new mutations. New mutations were more important for precipitation-related variables, where northeastern Taiwan had much more winter rainfall than most of continental Southeast Asia. Upon future climate change, new mutations showed higher genetic offset in regions of abrupt transition between allele frequency and local environments, suggesting their greater spatial heterogeneity of future vulnerability.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"558-570"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41136006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Shifts in Mutation Bias Promote Mutators by Altering the Distribution of Fitness Effects. 突变偏差的变化通过改变适应度效应的分布来促进突变。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-23 DOI: 10.1086/726010

Marwa Z Tuffaha, Saranya Varakunan, David Castellano, Ryan N Gutenkunst, Lindi M Wahl

引用次数: 0

Mutation and Selection Induce Correlations between Selection Coefficients and Mutation Rates. 突变和选择诱导选择系数和突变率之间的相关性。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-25 DOI: 10.1086/726014

Bryan L Gitschlag, Alejandro V Cano, Joshua L Payne, David M McCandlish, Arlin Stoltzfus

{"title":"Mutation and Selection Induce Correlations between Selection Coefficients and Mutation Rates.","authors":"Bryan L Gitschlag, Alejandro V Cano, Joshua L Payne, David M McCandlish, Arlin Stoltzfus","doi":"10.1086/726014","DOIUrl":"10.1086/726014","url":null,"abstract":"AbstractThe joint distribution of selection coefficients and mutation rates is a key determinant of the genetic architecture of molecular adaptation. Three different distributions are of immediate interest: (1) the \"nominal\" distribution of possible changes, prior to mutation or selection; (2) the \"de novo\" distribution of realized mutations; and (3) the \"fixed\" distribution of selectively established mutations. Here, we formally characterize the relationships between these joint distributions under the strong-selection/weak-mutation (SSWM) regime. The de novo distribution is enriched relative to the nominal distribution for the highest rate mutations, and the fixed distribution is further enriched for the most highly beneficial mutations. Whereas mutation rates and selection coefficients are often assumed to be uncorrelated, we show that even with no correlation in the nominal distribution, the resulting de novo and fixed distributions can have correlations with any combination of signs. Nonetheless, we suggest that natural systems with a finite number of beneficial mutations will frequently have the kind of nominal distribution that induces negative correlations in the fixed distribution. We apply our mathematical framework, along with population simulations, to explore joint distributions of selection coefficients and mutation rates from deep mutational scanning and cancer informatics. Finally, we consider the evolutionary implications of these joint distributions together with two additional joint distributions relevant to parallelism and the rate of adaptation.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"534-557"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41162768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Temporal Variation in Selection Influences Microgeographic Local Adaptation. 选择的时间变化影响微观地理局部适应。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-09-12 DOI: 10.1086/725865

Emily L Dittmar, Douglas W Schemske

{"title":"Temporal Variation in Selection Influences Microgeographic Local Adaptation.","authors":"Emily L Dittmar, Douglas W Schemske","doi":"10.1086/725865","DOIUrl":"10.1086/725865","url":null,"abstract":"AbstractEcological heterogeneity can lead to local adaptation when populations exhibit fitness trade-offs among habitats. However, the degree to which local adaptation is affected by the spatial and temporal scale of environmental variation is poorly understood. A multiyear reciprocal transplant experiment was performed with populations of the annual plant Leptosiphon parviflorus living on adjacent serpentine and nonserpentine soil. Local adaptation over this small geographic scale was observed, but there were differences in the temporal variability of selection across habitats. On serpentine soil, the local population had a consistently large survival advantage, presumably as a result of the temporal stability in selection imposed by soil cation content. In contrast, a fecundity advantage was observed for the sandstone population on its native soil type but only in the two study years with the highest rainfall. A manipulative greenhouse experiment demonstrated that the fitness advantage of the sandstone population in its native soil type depends critically on water availability. The temporal variability in local adaptation driven by variation in precipitation suggests that continued drought conditions have the potential to erode local adaptation in these populations. These results show how different selective factors can influence spatial and temporal patterns of variation in fitness trade-offs.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"471-485"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41173239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0