Island isolation reduces genetic diversity and connectivity but does not significantly elevate diploid male production in a neotropical orchid bee

Boff, Samuel; Soro, Antonella; Paxton, Robert J.; Alves-dos-Santos, Isabel

doi:10.1007/s10592-014-0605-0

Cited by 46 publications

(47 citation statements)

References 71 publications

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“…a probability of the molecular marker to detect a diploid individual as heterozygous, was performed according to Souza et al (2010). However, putative null alleles can cause difficulties in microsatellites scoring and can lead to an overestimation of P het (Souza et al 2010;Boff et al 2014). Like these authors, to account for putative null alleles we assumed that a male lacking an allele at a locus was caused by a null allele.…”

Section: Discussionmentioning

confidence: 99%

“…Like these authors, to account for putative null alleles we assumed that a male lacking an allele at a locus was caused by a null allele. Thus, we performed the calculation of P het-null applying the formula of Boff et al (2014). In Table S2 we show the number of samples that failed to amplify for different loci surveyed for the different species and populations.…”

Section: Discussionmentioning

confidence: 99%

“…The binomial 95 % confidence interval of the proportion of diploid males was calculated according to Souza et al (2010) and Boff et al (2014) (on-line tool at http://statpages.org/confint.html).…”

Section: Discussionmentioning

confidence: 99%

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Orchid bees: a new assessment on the rarity of diploid males in populations of this group of Neotropical pollinators

et al. 2015

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-The incidence of diploid males among 1457 individuals of different populations of six euglossine bee species (Eufriesea violacea , Eulaema cingulata , Euglossa annectans , Euglossa iopoecila , Euglossa pleosticta and Euglossa truncata ) was investigated with microsatellite markers. Bees were surveyed in Atlantic Forest fragments showing different sizes and degrees of human interference. Our analyses revealed that, although the frequencies of diploid males remained below 10 % for five out of six species studied, the frequencies of these males in three populations of Eg. annectans were above 15.0 %. For this species, while the average estimate of diploid males was around 11.0 %, the highest percentage (27 %) of such males was found for the population from an island. Our findings indicate that the frequency of diploid males can vary substantially among species and this fact should be taking into consideration in studies and conservation actions involving different euglossine bees. microsatellites / Euglossini / euglossine bees / Euglossa annectans / forest fragments

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Orchid bees: a new assessment on the rarity of diploid males in populations of this group of Neotropical pollinators

et al. 2015

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“…It is thus pertinent that this issue includes studies from such a wide range of organisms. From some of the largest and completely immobile; tropical tree species, standing some 40 m in height (Ismail et al 2014b); to small yet surprisingly, highly mobile insects (Boff et al 2014). …”

Section: Introductionmentioning

confidence: 99%

“…Bees are strong fliers and are thought to be highly mobile, yet their sensitivity to the habitat matrix can vary greatly among species. Boff et al (2014) take advantage of an island study system off the north coast of Brazil, to explore isolation and its impact on genetic diversity, connectivity and inbreeding in the orchid bee, Euglossa cordata. Haplodiploid insects are predicted to exhibit an increase in the frequency of inviable sterile diploid males as a result of reduced genetic diversity at the sex determining locus.…”

Section: Introductionmentioning

confidence: 99%

Fragmentation genetics in tropical ecosystems: from fragmentation genetics to fragmentation genomics

Kettle

2014

Conserv Genet

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Tropical regions are experiencing unprecedented economic and population growth. This goes hand in hand with increase habitat fragmentation of tropical ecosystems. Understanding the genetic consequences of these spatial and temporal changes across landscapes is critical to conservation of the vast majority of global biodiversity. This virtual issue of Conservation Genetics, presents six empirical and one review paper showcasing fascinating and important findings with regard to how habitat fragmentation impacts on genetic diversity in rare or endangered tropical species. The message from these papers is clear, fragmentation has a number of serious genetic consequences, which can contribute to undermining the viability of species in fragmented landscapes. Conservation genetics provides a powerful tool to inform both conservation and management of species and genetic resources. But, careful consideration is needed to ensure studies apply appropriate sampling designs and genetic analysis to better test hypothesis. Next generation genomics offers great opportunities to provide even more answers and greater resolution of the consequences for adaptive genetic variation, to ensure future tropical landscapes are resilient.

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Diploid male production correlates with genetic diversity in the parasitoid wasp Venturia canescens: a genetic approach with new microsatellite markers

Collet

Vayssade

Auguste

et al. 2016

Ecology and Evolution

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Sex determination is ruled by haplodiploidy in Hymenoptera, with haploid males arising from unfertilized eggs and diploid females from fertilized eggs. However, diploid males with null fitness are produced under complementary sex determination (CSD), when individuals are homozygous for this locus. Diploid males are expected to be more frequent in genetically eroded populations (such as islands and captive populations), as genetic diversity at the csd locus should be low. However, only a few studies have focused on the relation between population size, genetic diversity, and the proportion of diploid males in the field. Here, we developed new microsatellite markers in order to assess and compare genetic diversity and diploid male proportion (DMP) in populations from three distinct habitat types – mainland, island, or captive –, in the parasitoid wasp Venturia canescens. Eroded genetic diversity and higher DMP were found in island and captive populations, and habitat type had large effect on genetic diversity. Therefore, DMP reflects the decreasing genetic diversity in small and isolated populations. Thus, Hymenopteran populations can be at high extinction risk due to habitat destruction or fragmentation.

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Island isolation reduces genetic diversity and connectivity but does not significantly elevate diploid male production in a neotropical orchid bee

Cited by 46 publications

References 71 publications

Orchid bees: a new assessment on the rarity of diploid males in populations of this group of Neotropical pollinators

Orchid bees: a new assessment on the rarity of diploid males in populations of this group of Neotropical pollinators

Fragmentation genetics in tropical ecosystems: from fragmentation genetics to fragmentation genomics

Diploid male production correlates with genetic diversity in the parasitoid wasp Venturia canescens: a genetic approach with new microsatellite markers

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