American Naturalist最新文献_第8页

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

Acquired Phototrophy as an Evolutionary Path to Mixotrophy. 获得光营养作为混合营养的进化途径。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-29 DOI: 10.1086/725918

Alexandra L Brown, Grace A Casarez, Holly V Moeller

引用次数: 0

Seasonality in Environment and Population Processes Alters Population Spatial Synchrony. 环境和人口过程的季节性改变了人口的空间同步性。

IF 2.9 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-31 DOI: 10.1086/725804

Jonathan A Walter, Daniel C Reuman, Kimberly R Hall, Herman H Shugart, Lauren G Shoemaker

{"title":"Seasonality in Environment and Population Processes Alters Population Spatial Synchrony.","authors":"Jonathan A Walter, Daniel C Reuman, Kimberly R Hall, Herman H Shugart, Lauren G Shoemaker","doi":"10.1086/725804","DOIUrl":"10.1086/725804","url":null,"abstract":"AbstractPopulation spatial synchrony-the tendency for temporal population fluctuations to be correlated across locations-is common and important to metapopulation stability and persistence. One common cause of spatial synchrony, termed the Moran effect, occurs when populations respond to environmental fluctuations, such as weather, that are correlated over space. Although the degree of spatial synchrony in environmental fluctuations can differ between seasons and different population processes occur in different seasons, the impact on population spatial synchrony is uncertain because prior work has largely assumed that the spatial synchrony of environmental fluctuations and their effect on populations are consistent over annual sampling intervals. We used theoretical models to examine how seasonality in population processes and the spatial synchrony of environmental drivers affect population spatial synchrony. We found that population spatial synchrony can depend not only on the spatial synchrony of environmental drivers but also on the degree to which environmental fluctuations are correlated across seasons, locally, and across space. Moreover, measurements of synchrony from \"snapshot\" population censuses may not accurately reflect synchrony during other parts of the year. Together, these results show that neglecting seasonality in environmental conditions and population processes is consequential for understanding population spatial synchrony and its driving mechanisms.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"399-412"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41154869","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

Five Decades of Data Yield No Support for Adaptive Biasing of Offspring Sex Ratio in Wild Baboons (Papio cynocephalus). 五十年的数据不支持野生狒狒后代性别比的适应性偏差。

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: 10.1086/725886

Matthew N Zipple, Elizabeth A Archie, Jenny Tung, Raphael S Mututua, J Kinyua Warutere, I Long'ida Siodi, Jeanne Altmann, Susan C Alberts

{"title":"Five Decades of Data Yield No Support for Adaptive Biasing of Offspring Sex Ratio in Wild Baboons (Papio cynocephalus).","authors":"Matthew N Zipple, Elizabeth A Archie, Jenny Tung, Raphael S Mututua, J Kinyua Warutere, I Long'ida Siodi, Jeanne Altmann, Susan C Alberts","doi":"10.1086/725886","DOIUrl":"10.1086/725886","url":null,"abstract":"AbstractOver the past 50 years, a wealth of testable, often conflicting hypotheses have been generated about the evolution of offspring sex ratio manipulation by mothers. Several of these hypotheses have received support in studies of invertebrates and some vertebrate taxa. However, their success in explaining sex ratios in mammalian taxa-especially in primates-has been mixed. Here, we assess the predictions of four different hypotheses about the evolution of biased offspring sex ratios in the baboons of the Amboseli basin in Kenya: the Trivers-Willard, female rank enhancement, local resource competition, and local resource enhancement hypotheses. Using the largest sample size ever analyzed in a primate population (<math><mrow><mi>n</mi><mo>=</mo><mn>1,372</mn></mrow></math> offspring), we test the predictions of each hypothesis. Overall, we find no support for adaptive biasing of sex ratios. Offspring sex is not consistently related to maternal dominance rank or biased toward the dispersing sex, nor is it predicted by group size, population growth rates, or their interaction with maternal rank. Because our sample size confers power to detect even subtle biases in sex ratio, including modulation by environmental heterogeneity, these results suggest that adaptive biasing of offspring sex does not occur in this population.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"383-398"},"PeriodicalIF":2.9,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10998069/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41167179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Disentangling Positive Selection from Relaxed Selection in Animal Mitochondrial Genomes. 动物线粒体基因组中阳性选择与松弛选择的分离。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2023-10-01 Epub Date: 2023-08-31 DOI: 10.1086/725805

Kendra D Zwonitzer, Erik N K Iverson, Jess E Sterling, Ryan J Weaver, Bradley A Maclaine, Justin C Havird

{"title":"Disentangling Positive Selection from Relaxed Selection in Animal Mitochondrial Genomes.","authors":"Kendra D Zwonitzer, Erik N K Iverson, Jess E Sterling, Ryan J Weaver, Bradley A Maclaine, Justin C Havird","doi":"10.1086/725805","DOIUrl":"10.1086/725805","url":null,"abstract":"AbstractDisentangling different types of selection is a common goal in molecular evolution. Elevated dN/dS ratios (the ratio of nonsynonymous to synonymous substitution rates) in focal lineages are often interpreted as signs of positive selection. Paradoxically, relaxed purifying selection can also result in elevated dN/dS ratios, but tests to distinguish these two causes are seldomly implemented. Here, we reevaluated seven case studies describing elevated dN/dS ratios in animal mitochondrial DNA (mtDNA) and their accompanying hypotheses regarding selection. They included flightless lineages versus flighted lineages in birds, bats, and insects and physiological adaptations in snakes, two groups of electric fishes, and primates. We found that elevated dN/dS ratios were often not caused by the predicted mechanism, and we sometimes found strong support for the opposite mechanism. We discuss reasons why energetic hypotheses may be confounded by other selective forces acting on mtDNA and caution against overinterpreting singular molecular signals, including elevated dN/dS ratios.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"202 4","pages":"E121-E129"},"PeriodicalIF":2.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10955554/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41154868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anisogamy does not always promote the evolution of mating competition traits in males 异偶婚并不总是促进雄性交配竞争特征的进化

2区环境科学与生态学

American Naturalist Pub Date : 2023-09-29 DOI: 10.1086/727968

Mattias Siljestam, Ivain Martinossi-Allibert

引用次数: 1

Effects of parental care on the magnitude of inbreeding depression: a meta-analysis in fishes 亲代抚育对近交抑郁程度的影响:鱼类荟萃分析

2区环境科学与生态学

American Naturalist Pub Date : 2023-09-29 DOI: 10.1086/728001

Charlotte Patterson, Natalie Pilakouta

引用次数: 0

Plant phenotypes as distributions: Johannsen's beans revisited 植物表型作为分布:约翰森豆重访