American Naturalist最新文献_第3页

Females with Attractive Mates Gain Environmental Benefits That Increase Lifetime and Multigenerational Fitness. 有吸引力的配偶的雌性获得了环境效益，增加了寿命和多代适应度。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-03-01 Epub Date: 2025-01-24 DOI: 10.1086/733792

Douglas G Barron, Hubert Schwabl, Patrick A Carter, Daniel T Baldassarre, Willow R Lindsay, Jordan Karubian, Michael S Webster

{"title":"Females with Attractive Mates Gain Environmental Benefits That Increase Lifetime and Multigenerational Fitness.","authors":"Douglas G Barron, Hubert Schwabl, Patrick A Carter, Daniel T Baldassarre, Willow R Lindsay, Jordan Karubian, Michael S Webster","doi":"10.1086/733792","DOIUrl":"10.1086/733792","url":null,"abstract":"AbstractResolving the degree to which environmental (direct) versus genetic (indirect) benefits shape female mate choice is a long-standing challenge, particularly for socially monogamous species where male environmental and genetic contributions are difficult to disentangle. This study combines long-term population monitoring with quantitative genetic analyses in a socially monogamous but sexually promiscuous Australian songbird to demonstrate that female mating preferences are driven by nongenetic environmental benefits that increase the fitness of both the female and her offspring. Male Red-backed Fairywrens (Malurus melanocephalus) flexibly breed in either ornamented or unornamented plumage, and females consistently prefer ornamented males. Females paired with ornamented males bred earlier and allocated more to current reproduction yet experienced higher survival and lifetime fitness. Furthermore, these females produced more grand-offspring because their early-born sons were more likely to be ornamented and to breed successfully than the later-born sons of females with unornamented partners. Quantitative genetic models showed lifetime fitness was best explained by parental environment rather than genetic effects. Mating preferences in this system are maintained by a combination of primary environmental benefits that increase the lifetime fitness of choosy females and secondary environmental benefits that increase the multigenerational fitness of those females through enhanced offspring quality and performance.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 3","pages":"265-279"},"PeriodicalIF":2.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143450868","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

Fluctuation-Dependent Coexistence of Stage-Structured Species. 阶段结构物种的波动依赖共存。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-03-01 Epub Date: 2025-01-22 DOI: 10.1086/733382

Chhaya M Werner, Lauren M Hallett, Lauren G Shoemaker

{"title":"Fluctuation-Dependent Coexistence of Stage-Structured Species.","authors":"Chhaya M Werner, Lauren M Hallett, Lauren G Shoemaker","doi":"10.1086/733382","DOIUrl":"10.1086/733382","url":null,"abstract":"AbstractModern coexistence theory is a dominant framework for understanding how environmental fluctuations promote species coexistence. However, assessing fluctuation-dependent mechanisms of coexistence in empirical systems-in which species have diverse life histories and environment-competition relationships-has remained challenging for many ecologists. To help empiricists and theoreticians alike build intuition for the role of fluctuation-dependent mechanisms across systems and environments, we explore how two stage-structured life histories-perennial and seedbanking annuals-differ in competition with a nonseedbanking annual across three environmental scenarios. Our scenarios delineate how species partition resources within and among years and whether competition is most intense during favorable or unfavorable periods. We use this work to link differences in vital rates and interaction strengths to patterns and mechanisms of coexistence. Fluctuation-dependent mechanisms of coexistence can be equally important for perennial species with an adult \"storage\" stage as for seedbanking annuals. However, coexistence outcomes differentiate between these two stage-structured strategies based on whether they experience stronger or weaker competition in favorable environments. This work sets the stage for applying coexistence theory and fluctuation-dependent partitioning frameworks to perennial and mixed stage-structure communities, facilitating understanding of how environmental variation drives species dynamics across a broader range of systems.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 3","pages":"327-341"},"PeriodicalIF":2.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143450869","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

Demystifying Fundamental Theories in Ecology. 揭开生态学基本理论的神秘面纱。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-03-01 Epub Date: 2025-01-17 DOI: 10.1086/733789

Rachel Germain, Sebastian J Schreiber

引用次数: 0

Environmental Fluctuations Promote Host Reward Strategies That Maintain Partner Diversity in Multispecies Mutualisms. 环境波动促进宿主奖励策略，维持多物种互惠关系中的伴侣多样性。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-02-01 Epub Date: 2024-12-13 DOI: 10.1086/733224

Bethany L F Stevens, Kristen Howard, Laura M Bogar, Holly V Moeller

{"title":"Environmental Fluctuations Promote Host Reward Strategies That Maintain Partner Diversity in Multispecies Mutualisms.","authors":"Bethany L F Stevens, Kristen Howard, Laura M Bogar, Holly V Moeller","doi":"10.1086/733224","DOIUrl":"10.1086/733224","url":null,"abstract":"AbstractIn multispecies mutualisms, hosts might be expected to reward only the highest-quality partner in order to maximize benefits and prevent the proliferation of cheaters. In a fluctuating environment, however, partner quality is likely to vary over time, and the maintenance of low-quality partners has been shown to be beneficial in some environmental regimes. Here, we present a model of a simple tree-fungal mutualism with two distinct environmental conditions and a host that can employ reward strategies with varying degrees of preference for higher-quality fungi. We find that in many environmental regimes, the most successful strategy for the host is one that actively maintains equal densities of the two fungal partners, in spite of their immediate differences in quality. This conservative bet-hedging strategy leads to reduced variance in the tree's carbon resources and high resilience to environmental perturbation. An alternative reward strategy, which supports only the highest-quality partner at a time, is most successful under some conditions when fluctuations in the environment are infrequent. Longer periods of environmental stasis thus increase the risk to the tree of losing fungal partner diversity. This theoretical work identifies a mechanism by which biodiversity may be actively maintained in multispecies mutualisms but that may be disrupted as environmental conditions change.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 2","pages":"137-148"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143366687","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

Effects of Phylogeny on Coexistence in Model Communities. 系统发育对模式群落共存的影响。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-02-01 Epub Date: 2024-12-12 DOI: 10.1086/733415

Carlos A Serván, José A Capitán, Zachary R Miller, Stefano Allesina

{"title":"Effects of Phylogeny on Coexistence in Model Communities.","authors":"Carlos A Serván, José A Capitán, Zachary R Miller, Stefano Allesina","doi":"10.1086/733415","DOIUrl":"10.1086/733415","url":null,"abstract":"AbstractSpecies' interactions are shaped by their traits. Thus, we expect traits-in particular, trait (dis)similarity-to play a central role in determining whether a particular set of species coexists. Traits are, in turn, the outcome of an eco-evolutionary process summarized by a phylogenetic tree. Therefore, the phylogenetic tree associated with a set of species should carry information about the dynamics and assembly properties of the community. Many studies have highlighted the potentially complex ways in which this phylogenetic information is translated into species' ecological properties. However, much less emphasis has been placed on developing clear, quantitative expectations for community properties under a particular hypothesis. To address this gap, we couple a simple model of trait evolution on a phylogenetic tree with Lotka-Volterra community dynamics. This allows us to derive properties of a community of coexisting species as a function of the number of traits, tree topology, and the size of the species pool. Our analysis highlights how phylogenies, through traits, affect the coexistence of a set of species. Together, these results provide much-needed baseline expectations for the ways in which evolutionary history, summarized by phylogeny, is reflected in the size and structure of ecological communities.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 2","pages":"E34-E48"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143366684","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

The Evolution of Using Shed Snake Skin in Bird Nests. 蛇皮在鸟巢中的应用演变。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-02-01 Epub Date: 2024-12-18 DOI: 10.1086/733208

Vanya G Rohwer, Jennifer L Houtz, Maren N Vitousek, Robyn L Bailey, Eliot T Miller

{"title":"The Evolution of Using Shed Snake Skin in Bird Nests.","authors":"Vanya G Rohwer, Jennifer L Houtz, Maren N Vitousek, Robyn L Bailey, Eliot T Miller","doi":"10.1086/733208","DOIUrl":"10.1086/733208","url":null,"abstract":"AbstractMany species of birds use shed snake skin in nest construction, but this behavior remains poorly understood. Ecological context is likely key for understanding how this unusual, but widespread, behavior evolved. We use comparative and experimental approaches to suggest that the evolution of this behavior is mediated by nest morphology and predator communities. First, we reviewed the literature and found that 78 species from 22 families have been reported to use shed snake skin in nest construction. All but one of these species are passerines and, using comparative analyses, we show that this behavior is disproportionately observed in cavity-nesting species. Second, we examined a subsample of North American species, all of which are reported to use snake skin in nest construction, to see whether the proportion of nests with snake skin differs between cavity- and open cup-nesting species. This analysis suggested that the proportion of nests with snake skin is roughly 6.5 times higher in cavity- than in open cup-nesting species. Finally, we used a series of experiments and comparisons to test four hypotheses whereby snake skin could award fitness benefits (nest predation, nest microbiotas, nest ectoparasites, social signaling) and found support for the predation hypothesis. Snake skin reduced nest predation in cavity, but not open cup, nests. These unequal fitness benefits highlight different ecological conditions between nest morphologies and likely explains why, across species, cavity-nesting birds show this behavior more frequently than open cup-nesting birds.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 2","pages":"170-183"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143366754","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

Fight Not Flight: Parasites Drive the Bacterial Evolution of Resistance, Not Escape. 战斗而不是逃跑：寄生虫驱使细菌进化抵抗，而不是逃跑。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-02-01 Epub Date: 2024-12-16 DOI: 10.1086/733414

Michael Blazanin, Jeremy Moore, Sydney Olsen, Michael Travisano

{"title":"Fight Not Flight: Parasites Drive the Bacterial Evolution of Resistance, Not Escape.","authors":"Michael Blazanin, Jeremy Moore, Sydney Olsen, Michael Travisano","doi":"10.1086/733414","DOIUrl":"10.1086/733414","url":null,"abstract":"AbstractIn the face of ubiquitous threats from parasites, hosts can evolve strategies to resist infection or to altogether avoid parasitism, for instance by avoiding behavior that could expose them to parasites or by dispersing away from local parasite threats. At the microbial scale, bacteria frequently encounter viral parasites, bacteriophages. While bacteria are known to utilize a number of strategies to resist infection by phages and can have the capacity to avoid moving toward phage-infected cells, it is unknown whether bacteria can evolve dispersal to escape from phages. To answer this question, we combined experimental evolution and mathematical modeling. Experimental evolution of the bacterium Pseudomonas fluorescens in environments with differing spatial distributions of the phage Phi2 revealed that the host bacteria evolved resistance depending on parasite distribution but did not evolve dispersal to escape parasite infection. Simulations using parameterized mathematical models of bacterial growth and swimming motility showed that this is a general finding: while increased dispersal is adaptive in the absence of parasites, in the presence of parasites that fitness benefit disappears and resistance becomes adaptive, regardless of the spatial distribution of parasites. Together, these experiments suggest that parasites should rarely, if ever, drive the evolution of bacterial escape via dispersal.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 2","pages":"125-136"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143366694","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

The Genetic Consequences of Range Expansion and Its Influence on Diploidization in Polyploids. 范围扩大的遗传后果及其对多倍体二倍体的影响。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-02-01 Epub Date: 2024-12-06 DOI: 10.1086/733334

William W Booker, Daniel R Schrider

{"title":"The Genetic Consequences of Range Expansion and Its Influence on Diploidization in Polyploids.","authors":"William W Booker, Daniel R Schrider","doi":"10.1086/733334","DOIUrl":"10.1086/733334","url":null,"abstract":"AbstractDespite newly formed polyploids being subjected to myriad fitness consequences, the relative prevalence of polyploidy, both contemporarily and in ancestral branches of the tree of life, suggests alternative advantages that outweigh these consequences. One proposed advantage is that polyploids may more easily colonize novel habitats, such as deglaciated areas. However, previous research conducted in diploids suggests that range expansion comes with a fitness cost, as deleterious mutations may fix rapidly on the expansion front. Here, we interrogate the potential consequences of expansion in polyploids by conducting spatially explicit forward-in-time simulations to investigate how ploidy and inheritance patterns impact the relative ability of polyploids to expand their range. We show that under realistic dominance models, autopolyploids suffer greater fitness reductions than diploids as a result of range expansion due to the fixation of increased mutational load that is masked in the range core. Alternatively, the disomic inheritance of allopolyploids provides a shield to this fixation, resulting in minimal fitness consequences. In light of this advantage provided by disomy, we investigate how range expansion may influence cytogenetic diploidization through the reversion to disomy in autotetraploids. We show that under a wide range of parameters investigated for two models of diploidization, disomy frequently evolves more rapidly on the expansion front than in the range core, and that this dynamic inheritance model has additional effects on fitness. Together our results point to a complex interaction among dominance, ploidy, inheritance, and recombination on fitness as a population spreads across a geographic range.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 2","pages":"203-223"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143366756","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

A Life History Perspective on the Evolutionary Interplay of Sex Ratios and Parental Sex Roles. 从生活史的角度看性别比例和父母性别角色的进化相互作用。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-02-01 Epub Date: 2024-12-04 DOI: 10.1086/733457

Xiaoyan Long, Tamas Székely, Jan Komdeur, Franz J Weissing

{"title":"A Life History Perspective on the Evolutionary Interplay of Sex Ratios and Parental Sex Roles.","authors":"Xiaoyan Long, Tamas Székely, Jan Komdeur, Franz J Weissing","doi":"10.1086/733457","DOIUrl":"10.1086/733457","url":null,"abstract":"AbstractThe parental roles of males and females differ remarkably across the tree of life, and several studies suggest that parental sex roles are associated with biased sex ratios. However, there is considerable debate on the causal relationship between sex roles and sex ratios and on the relative importance of the operational sex ratio (OSR), the adult sex ratio (ASR), and the maturation sex ratio (MSR). Here, we use individual-based evolutionary simulations to investigate the joint evolution of sex-specific parental behavior and the various sex ratios in several life history scenarios. We show that typically, but not always, the sex with lower mortality or faster maturity tends to provide most of the care. The association of parental sex roles with the various sex ratios is more intricate. At equilibrium, the OSR is typically biased toward the less caring sex, but the direction and strength of OSR biases may change considerably during evolution. When the MSR or ASR is biased, a broad spectrum of parental care patterns can evolve, although the overrepresented sex generally does most of the caring. We conclude that none of the sex ratios is a driver of parental sex roles; they rather coevolve with care biases in a subtle manner.","PeriodicalId":50800,"journal":{"name":"American Naturalist","volume":"205 2","pages":"E49-E65"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143366680","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

Female Embryos Are More Likely to Die Than Males in a Wild Mammal. 野生哺乳动物的雌性胚胎比雄性胚胎更容易死亡。

IF 2.4 2区环境科学与生态学

American Naturalist Pub Date : 2025-02-01 Epub Date: 2024-11-27 DOI: 10.1086/733425

Mathieu Douhard, Eric Baubet, Marlène Gamelon

引用次数: 0