Does recent habitat fragmentation affect the population genetics of a heathland specialist, Andrena fuscipes (Hymenoptera: Andrenidae)?

Exeler, Nina; Hochkirch, Axel

doi:10.1007/s10592-010-0060-5

Cited by 24 publications

(22 citation statements)

References 57 publications

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“…Exeler et al (2008) found low differentiation among groups of the solitary bee Andrena vaga from patches of habitat in northern Germany that were \20 km apart but strong IBD over hundreds of kilometers. However, Exeler et al (2010) found low differentiation over more than a hundred kilometers among groups of a related solitary bee, A. fuscipes. Thus, it seems that levels of genetic differentiation among groups seem to vary among species both within the orchid bees and for other bee groups.…”

Section: Discussionmentioning

confidence: 88%

Population genetics of orchid bees in a fragmented tropical landscape

Suni

Brosi

2011

Conserv Genet

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The prospects for persistence of bees living in fragmented landscapes is a topic of considerable interest due to bees' importance as pollinators of agricultural crops and wild plants, coupled with the ubiquity of native habitat loss and evidence that bees may be declining worldwide. Population persistence in fragmented areas depends on dispersal potential and maintenance of gene flow among fragments of habitat. Here we used population genetic techniques to characterize, for two equally abundant orchid bee species that differ in their physiology and ecology, levels of genetic differentiation among fragments of tropical forest in southeastern Costa Rica in a *200 km 2 landscape. We measured population differentiation with / PT (an analogue to the traditional summary statistic Fst), as well as two measures that may more accurately reflect the level of differentiation when highly variable loci are used: G'st and D est . We also calculated pairwise genetic distances among individuals and conducted Mantel tests to test the correlation of genetic and geographic distance, for each species. We found strong differences in genetic structure between the species. Contrary to our expectations, each measure of genetic structure revealed that the largerbodied species, Eulaema bombiformis, had higher levels of differentiation than the smaller species, Euglossa championi. Furthermore, for Eulaema bombiformis there was a significant positive correlation of genetic and geographic distance while for Euglossa championi there was no significant positive correlation. Our results demonstrate that bee species can have strikingly different levels of gene flow in fragmented habitats, and that body size may not always act as a useful proxy for dispersal, even in closely related taxa.

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Section: Discussionmentioning

confidence: 88%

Population genetics of orchid bees in a fragmented tropical landscape

Suni

Brosi

2011

Conserv Genet

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“…Much of the previous research on interpopulation structure of bee populations has focused on foraging specialist or species of special conservation concern (Danforth et al 2003;Zayed & Packer 2007;Exeler et al 2010;Lozier et al 2011;Suni & Brosi 2011;Cern a et al 2013;Dellicour et al 2014;L opez-Uribe et al 2016). This is the first study to examine the influence of nesting resource specialization on population structure.…”

Section: Discussionmentioning

confidence: 99%

“…As a result, specialist bee populations should have lower population sizes and should exhibit higher levels of population differentiation (F ST ) between populations than generalist bees (Packer & Owen 2001;Packer et al 2005). However, there is increasing evidence that specialists do not necessarily live in fragmentary populations, as some exhibit much lower levels of population differentiation than expected (Exeler et al 2008(Exeler et al , 2010Cern a et al 2013;Dellicour et al 2014). Thus, population structure likely depends not on foraging specialization per se, but on the spatial distribution of specialized food resources.…”

Section: Introductionmentioning

confidence: 99%

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Nesting habits influence population genetic structure of a bee living in anthropogenic disturbance

Vickruck

Richards

2017

Molecular Ecology

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While most organisms are negatively affected by anthropogenic disturbance, a few species thrive in landscapes altered by humans. Typically, native bees are negatively impacted by anthropogenic environmental change, including habitat alteration and climate change. Here, we investigate the population structure of the eastern carpenter bee Xylocopa virginica, a generalist pollinator with a broad geographic range spanning eastern North America. Eastern carpenter bees now nest almost exclusively in artificial wooden structures, linking their geographic distribution and population structure to human activities and disturbance. To investigate the population structure of these bees, we sampled females from 16 different populations from across their range. Nine species-specific microsatellite loci showed that almost all populations are genetically distinct, but with high levels of genetic diversity and low levels of inbreeding overall. Broadly speaking, populations clustered into three distinct genetic groups: a northern group, a western group and a core group. The northern group had low effective population sizes, decreased genetic variability and the highest levels of inbreeding in the data set, suggesting that carpenter bees may be expanding their range northward. The western group was genetically distinct, but lacked signals of a recent range expansion. Climatic data showed that summer and winter temperatures explained a significant amount of the genetic differentiation seen among populations, while precipitation did not. Our results indicate that X. virginica may be one of the rare 'anthrophilic' species that thrive in the face of anthropogenic disturbance.

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“…Johannesen et al (1999) found a high gene flow between populations of the grasshopper Stenobothrus lineatus despite a low mobility measured in a mark-recapture study. This suggests that either dispersal is under-estimated in field studies as the probability to find individuals decreases exponentially with the distance (Hochkirch and Damerau 2009) or that the genetic structure of populations is stronger influenced by historical events than by ongoing gene flow (Exeler et al 2010). However, based upon the existing data it seems likely that populations of C. montanus are strongly fragmented as has been shown in other flightless Orthoptera species (Witzenberger and Hochkirch 2008).…”

Section: Conservation Implicationsmentioning

confidence: 99%

Mobility and microhabitat utilization in a flightless wetland grasshopper, Chorthippus montanus (Charpentier, 1825)

2011

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Wetlands are among the most threatened habitat types on our planet. Their decline will probably even intensify under climate change. Many biota are strongly dependent on wetlands, including a large number of invertebrate species. The populations of such hygrophilous species become increasingly disconnected due to the ongoing fragmentation of their habitats. This is particularly true for species with reduced dispersal capacities, such as flightless insects. We studied mobility, population size and microhabitat utilization in a population of an endangered grasshopper species, the Water-meadow Grasshopper, Chorthippus montanus. Our mark-recapture study revealed that the cumulative movement distance of the adults was on average 23.5 m with a maximum of 104 m. The microhabitat analysis showed that both sexes of C. montanus preferred warmer patches with greater radiation than measured at control sites. Niche overlap among sexes was stronger than expected by chance, while niche overlap between insects and controls showed the opposite pattern. Our results suggest that C. montanus is strongly restricted to its habitat and is probably not able to cross larger distances through unsuitable vegetation. Hence, we assume that the populations of this flightless insect species are strongly isolated. However, the effect of the rare macropterous morph of C. montanus on gene flow remains unknown. Wetland restoration is crucial to reconnect the existing wetland patches in Central Europe and thereby reduce the negative effects of habitat fragmentation on wetland species.

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Does recent habitat fragmentation affect the population genetics of a heathland specialist, Andrena fuscipes (Hymenoptera: Andrenidae)?

Cited by 24 publications

References 57 publications

Population genetics of orchid bees in a fragmented tropical landscape

Population genetics of orchid bees in a fragmented tropical landscape

Nesting habits influence population genetic structure of a bee living in anthropogenic disturbance

Mobility and microhabitat utilization in a flightless wetland grasshopper, Chorthippus montanus (Charpentier, 1825)

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