As the raven flies: using genetic data to infer the history of invasive common raven (<i>Corvus corax</i>) populations in the Mojave Desert

Fleischer, Robert C.; Boarman, William I.; González, Elena; Godinez, Alvaro; Omland, Kevin E.; Young, Shane; Helgen, Lauren E.; Syed, Gracia; McIntosh, Carl

doi:10.1111/j.1365-294x.2007.03532.x

Cited by 20 publications

(29 citation statements)

References 49 publications

(89 reference statements)

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“…F ST values for highly variable markers, such as microsatellites, tend to be lower than estimates for other types of markers (see Hedrick 1999), so an F ST of 0.026 for microsatellites suggests a sizable degree of genetic structuring. In fact, this F ST value at local population level is only slightly lower than that reported for congeneric ravens Corvus corax at landscape scale (0.032), covering the states of California and Nevada (Fleischer et al 2007), providing some indication of effect size. The 'pocket' of dry forest-assigned crows in farmland habitat (site F2) is intriguing and deserves further investigation in future work.…”

Section: Discussionmentioning

confidence: 81%

“…'Introduction' section). Previous genetic studies of other corvids have largely attributed finescale structuring to short dispersal distances, strong philopatry and use of patchy habitats (common ravens, F ST 0 0.032, Fleischer et al 2007; Florida scrub jays Aphelocoma coerulescens, F ST 00.074, Coulon et al 2008; see also Haas et al 2009;Tarr and Fleischer 1999). Cooperative breeding, in which young delay dispersal and assist their parents to raise subsequent broods, is one possible mechanism by which genetic differences could accumulate over small geographic scales (McDonald et al 1999).…”

Section: Discussionmentioning

confidence: 99%

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Restricted gene flow and fine-scale population structuring in tool using New Caledonian crows

Rutz

Ryder

Fleischer

2012

Naturwissenschaften

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New Caledonian crows Corvus moneduloides are the most prolific avian tool users. It has been suggested that some aspects of their complex tool use behaviour are under the influence of cultural processes, involving the social transmission-and perhaps even progressive refinement-of tool designs. Using microsatellite and mt-haplotype profiling of crows from three distinct habitats (dry forest, farmland and beachside habitat), we show that New Caledonian crow populations can exhibit significant fine-scale genetic structuring. Our finding that some sites of <10 km apart were highly differentiated demonstrates considerable potential for genetic and/or cultural isolation of crow groups. Restricted movement of birds between local populations at such small spatial scales, especially across habitat boundaries, illustrates how specific tool designs could be preserved over time, and how tool technologies of different crow groups could diverge due to drift and local selection pressures. Young New Caledonian crows have an unusually long juvenile dependency period, during which they acquire complex tool-related foraging skills. We suggest that the resulting delayed natal dispersal drives population-divergence patterns in this species. Our work provides essential context for future studies that examine the genetic makeup of crow populations across larger geographic areas, including localities with suspected cultural differences in crow tool technologies.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Restricted gene flow and fine-scale population structuring in tool using New Caledonian crows

Rutz

Ryder

Fleischer

2012

Naturwissenschaften

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“…This, along with the high effective sample size and low autocorrelation estimate, suggested the Markov chains reached convergence after a sufficiently long burn-in period and were sampled from the appropriate likelihood space. A generation time of 1 year [26] and a mutation rate of 10 -5 to 10 -4 per generation for birds [84-89] were used to convert divergence time into calendar years. Given the uncertainty in mutation rates, the resultant estimates should be interpreted with caution.…”

Section: Methodsmentioning

confidence: 99%

Lineage diversification and historical demography of a montane bird Garrulax elliotii - implications for the Pleistocene evolutionary history of the eastern Himalayas

Luo

Zhang

et al. 2011

BMC Evol Biol

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BackgroundPleistocene climate fluctuations have shaped the patterns of genetic diversity observed in many extant species. In montane habitats, species' ranges may have expanded and contracted along an altitudinal gradient in response to environmental fluctuations leading to alternating periods of genetic isolation and connectivity. Because species' responses to climate change are influenced by interactions between species-specific characteristics and local topography, diversification pattern differs between species and locations. The eastern Himalayas is one of the world's most prominent mountain ranges. Its complex topography and environmental heterogeneity present an ideal system in which to study how climatic changes during Pleistocene have influenced species distributions, genetic diversification, and demography. The Elliot's laughing thrush (Garrulax elliotii) is largely restricted to high-elevation shrublands in eastern Himalayas. We used mitochondrial DNA and microsatellites to investigate how genetic diversity in this species was affected by Pleistocene glaciations.ResultsMitochondrial data detected two partially sympatric north-eastern and southern lineages. Microsatellite data, however, identified three distinct lineages congruent with the geographically separated southern, northern and eastern eco-subregions of the eastern Himalayas. Geographic breaks occur in steep mountains and deep valleys of the Kangding-Muli-Baoxin Divide. Divergence time estimates and coalescent simulations indicate that lineage diversification occurred on two different geographic and temporal scales; recent divergence, associated with geographic isolation into individual subregions, and historical divergence, associated with displacement into multiple refugia. Despite long-term isolation, genetic admixture among these subregional populations was observed, indicating historic periods of connectivity. The demographic history of Garrulax elliotii shows continuous population growth since late Pleistocene (about 0.125 mya).ConclusionWhile altitude-associated isolation is typical of many species in other montane regions, our results suggest that eco-subregions in the eastern Himalayas exhibiting island-like characteristics appear to have determined the diversification of Garrulax elliotii. During the Pleistocene, these populations became isolated on subregions during interglacial periods but were connected when these expanded to low altitude during cooler periods. The resultant genetic admixture of lineages might obscure pattern of genetic variation. Our results provide new insights into sky island diversification in a previously unstudied region, and further demonstrate that Pleistocene climatic changes can have profound effects on lineage diversification and demography in montane species.

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“…A number of landscape-scale studies have revealed patterns of genetic structure in expanding invasive populations [15], [20]. However, fine-scale patterns are especially likely to differ from larger scale patterns in invasive populations because large-scale patterns may reflect mass (human-mediated) dispersal, while finer scale patterns may reflect natural dispersal [16], [17], [18], [21].…”

Section: Introductionmentioning

confidence: 99%

Fine-Scale Genetic Structure Arises during Range Expansion of an Invasive Gecko

Short

Petren

2011

PLoS ONE

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Processes of range expansion are increasingly important in light of current concerns about invasive species and range shifts due to climate change. Theoretical studies suggest that genetic structuring may occur during range expansion. Ephemeral genetic structure can have important evolutionary implications, such as propagating genetic changes along the wave front of expansion, yet few studies have shown evidence of such structure. We tested the hypothesis that genetic structure arises during range expansion in Hemidactylus mabouia, a nocturnal African gecko recently introduced to Florida, USA. Twelve highly variable microsatellite loci were used to screen 418 individuals collected from 43 locations from four sampling sites across Florida, representing a gradient from earlier (∼1990s) to very recent colonization. We found earlier colonized locations had little detectable genetic structure and higher allelic richness than more recently colonized locations. Genetic structuring was pronounced among locations at spatial scales of tens to hundreds of meters near the leading edge of range expansion. Despite the rapid pace of range expansion in this introduced gecko, dispersal is limited among many suitable habitat patches. Fine-scale genetic structure is likely the result of founder effects during colonization of suitable habitat patches. It may be obscured over time and by scale-dependent modes of dispersal. Further studies are needed to determine if such genetic structure affects adaptation and trait evolution in range expansions and range shifts.

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As the raven flies: using genetic data to infer the history of invasive common raven (Corvus corax) populations in the Mojave Desert

Cited by 20 publications

References 49 publications

Restricted gene flow and fine-scale population structuring in tool using New Caledonian crows

Restricted gene flow and fine-scale population structuring in tool using New Caledonian crows

Lineage diversification and historical demography of a montane bird Garrulax elliotii - implications for the Pleistocene evolutionary history of the eastern Himalayas

Fine-Scale Genetic Structure Arises during Range Expansion of an Invasive Gecko

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