Clinal variation in a brown lemur (<i>Eulemur</i>spp.) hybrid zone: Combining morphological, genetic and climatic data to examine stability

Delmore, Kira E.; Brenneman, Rick A.; Lei, Runhua; Bailey, Carolyn A.; Brelsford, Alan; Louis, Edward E.; Johnson, Steig E.

doi:10.1111/jeb.12178

Cited by 9 publications

(12 citation statements)

References 80 publications

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“…0.3–0.6 Mya, and there has probably been no exchange of migrants between them (Fooden, ; Chu et al ., ). This timescale is sufficient to differentiate allele frequencies for primates, and it often results in hybrid heterosis in some trophic traits, for example cranial dimensions (Cheverud et al ., ; Schillaci et al ., ; Ackermann et al ., , ; Delmore et al ., ). Our analyses detected deviations from an additive model in some craniofacial dimensions and shape, which included both heterosis and dysgenesis.…”

Section: Discussionmentioning

confidence: 97%

Maxillary sinus variation in hybrid macaques: implications for the genetic basis of craniofacial pneumatization

Ito

Kawamoto

Hamada

et al. 2015

Biol J Linn Soc Lond

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There has been a long‐standing debate regarding the diversification of paranasal sinuses, namely pneumatized spaces in the face. Functional adaptation and structural constraints have generally been suggested to explain sinus diversification in vertebrates. Here we investigated variation in the maxillary sinus and the external facial cranium in hybrid Taiwanese–Japanese macaques to estimate the genetic basis of phenotypic differences. The Taiwanese macaques have a large sinus, whereas the Japanese macaques have a small sinus; they are also significantly different in their external craniofacial morphology. Variations in the hybrids' external craniofacial morphology can be mostly explained by a simple additive model. In contrast, their sinus morphology significantly deviates from the value expected under this additive model, wherein most hybrids have a large sinus, similar to that in Taiwanese macaques, regardless of the degree of hybridization. When the whole structure is considered, a novel phenotype can be seen in the hybrids. Our results suggest that the sinus and face are independent of each other, both genetically and developmentally, and that the small sinus is mainly caused by intrinsic genetic factors, rather than being structurally constrained by the craniofacial architecture. Such genetic factors may have contributed to the enigmatic diversity of craniofacial pneumatization. © 2015 The Linnean Society of London, Biological Journal of the Linnean Society, 2015, 115, 333–347.

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Section: Discussionmentioning

confidence: 97%

Maxillary sinus variation in hybrid macaques: implications for the genetic basis of craniofacial pneumatization

Ito

Kawamoto

Hamada

et al. 2015

Biol J Linn Soc Lond

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“…Importantly, both intrinsic and extrinsic sources of selection may act simultaneously in natural hybrid zones, and therefore, some zones may share characteristics of multiple of these described models (e.g., Bert and Arnold 1995; Delmore et al. 2013). In such cases, interactions between biotic and abiotic factors may be responsible for determining range limits.…”

Section: Introductionmentioning

confidence: 99%

Differential effects of climate and species interactions on range limits at a hybrid zone: potential direct and indirect impacts of climate change

McQuillan

Rice

2015

Ecology and Evolution

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The relative contributions of climate versus interspecific interactions in shaping species distributions have important implications for closely related species at contact zones. When hybridization occurs within a contact zone, these factors regulate hybrid zone location and movement. While a hybrid zone's position may depend on both climate and interactions between the hybridizing species, little is known about how these factors interact to affect hybrid zone dynamics. Here, we utilize SDM (species distribution modeling) both to characterize the factors affecting the current location of a moving North American avian hybrid zone and to predict potential direct and indirect effects of climate change on future distributions. We focus on two passerine species that hybridize where their ranges meet, the Black‐capped (Poecile atricapillus) and Carolina (P. carolinensis) chickadee. Our contemporary climate models predict the occurrence of climatically suitable habitat extending beyond the hybrid zone for P. atricapillus only, suggesting that interspecific interactions primarily regulate this range boundary in P. atricapillus, while climatic factors regulate P. carolinensis. Year 2050 climate models predict a drastic northward shift in suitable habitat for P. carolinensis. Because of the greater importance of interspecific interactions for regulating the southern range limit of P. atricapillus, these climate‐mediated shifts in the distribution of P. carolinensis may indirectly lead to a range retraction in P. atricapillus. Together, our results highlight the ways climate change can both directly and indirectly affect species distributions and hybrid zone location. In addition, our study lends support to the longstanding hypothesis that abiotic factors regulate species' poleward range limits, while biotic factors shape equatorial range limits.

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“…Without comparative and comprehensive datasets, the interpretation of delimitation analyses can pose more of a problem than the species criteria, which normally receive most of the criticism. 29,30 Conservative interpretation of the species delimitation method is always warranted; however, conservation management decisions are influenced depending on whether they are presented from one side of the debate or the other (that is, delimited species or taxonomic inflation). Within the next decade, targeted enrichment technologies can be used to generate millions of bases of DNA sequence of orthologous coding regions from nuclear genomes and complete mitogenomes.…”

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confidence: 99%

Defining species in an advanced technological landscape

Louis¹,

Lei²

2014

Evolutionary Anthropology

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The answer to the proffered question, "What is a species?" is considered one of the fundamental issues of biological science, as well as one of the most polarizing and sometimes acrimonious problems. Dozens of species concepts have been defined, but none are universal for implementation across all taxa. Within the past thirty years, the ability to analyze DNA data has progressed to the point that multiple methodologies can be simultaneously applied to the same evolutionary questions. The use of restriction fragment length polymorphisms, microsatellites, and mitochondrial (mtDNA) and nuclear DNA (nucDNA) sequence data has unarguably changed how we look at diversity and intensified the concept debate through the proliferation of species descriptions. Over the past two decades, Madagascar's biodiversity has gone through a tremendous taxonomic expansion by the elevation of subspecies to species and through novel descriptions, especially within the nocturnal lemurs. With the tremendous continuous loss of habitat, exponential human population growth, and stochastic changes predicted over coming decades, elucidating the earth's biodiversity will never be more important than now. Here, we examine species concepts and their attendant criteria. We predict how technological advances will alter, improve and, we hope, fully consolidate the unity of thoughts related to this central topic of evolutionary biology and its numerous interconnected disciplines.

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Clinal variation in a brown lemur (Eulemurspp.) hybrid zone: Combining morphological, genetic and climatic data to examine stability

Cited by 9 publications

References 80 publications

Maxillary sinus variation in hybrid macaques: implications for the genetic basis of craniofacial pneumatization

Maxillary sinus variation in hybrid macaques: implications for the genetic basis of craniofacial pneumatization

Differential effects of climate and species interactions on range limits at a hybrid zone: potential direct and indirect impacts of climate change

Defining species in an advanced technological landscape

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