Genetic structure of island and mainland populations of a Neotropical bumble bee species

Francisco, Flávio de Oliveira; Santiago, Leandro Rodrigues; Mizusawa, Yuri M.; Oldroyd, Benjamin P.; Arias, Maria Cristina

doi:10.1007/s10841-016-9872-z

Cited by 19 publications

(19 citation statements)

References 82 publications

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“…Several studies have found a significant relationship between distance to the mainland and genetic diversity (Francisco et al, ; García‐Verdugo et al, ; Hill et al, ; Yamada & Maki, ). Similarly, we found a significant relationship between H o and distance to the mainland.…”

Section: Discussionmentioning

confidence: 99%

Island biogeography theory explains the genetic diversity of a fragmented rock ptarmigan (Lagopus muta) population

Costanzi

Steifetten

2019

Ecology and Evolution

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The island biogeography theory is one of the major theories in ecology, and its applicability to natural systems is well documented. The core model of the theory, the equilibrium model of island biogeography, predicts that species diversity on an island is positively related to the size of the island, but negatively related by the island's distance to the mainland. In recent years, ecologists have begun to apply this model when investigating genetic diversity, arguing that genetic and species diversity might be influenced by similar ecological processes. However, most studies have focused on oceanic islands, but knowledge on how the theory applies to islands located on the mainland (e.g., mountain islands, forest islands) is scarce. In this study, we examined how the size and degree of isolation of mountain islands would affect the genetic diversity of an alpine bird, the rock ptarmigan ( Lagopus muta ). Within our study area, we defined the largest contiguous mountain area as the mainland, while smaller mountains surrounding the mainland were defined as islands. We found that the observed heterozygosity ( H o ) was significantly higher, and the inbreeding coefficient ( F is ) significantly lower, on the mainland compared to islands. There was a positive significant relationship between the unbiased expected heterozygosity ( H n.b. ) and island size (log km 2 ), but a negative significant relationship between H o and the cost distance to the mainland. Our results are consistent with the equilibrium model of island biogeography and show that the model is well suited for investigating genetic diversity among islands, but also on islands located on the mainland.

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Section: Discussionmentioning

confidence: 99%

Island biogeography theory explains the genetic diversity of a fragmented rock ptarmigan (Lagopus muta) population

Costanzi

Steifetten

2019

Ecology and Evolution

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“…This unexpected pattern of old lineages isolated on young “land‐bridge islands” has also been observed in the islands off the Top End to the east for the ecologically similar C. amax (Potter et al., ) and the gecko Heteronotia binoei (Moritz et al., ), such that these islands constitute a hotspot of phylogeographic endemism (Rosauer et al., ). Comparisons of populations of insects (Francisco, Santiago, Mizusawa, Oldroyd, & Arias, ) and frogs (Bell, Brasileiro, Haddad, & Zamudio, ) on land‐bridge islands with nearby mainland sites in Brazil have also revealed deeper divergences than expected from recent sea‐level rise, possibly due to intensification of pre‐existing genetic differentiation by sea‐level incursions (Bell et al., ). Hawlitschek et al.…”

Section: Discussionmentioning

confidence: 99%

Tropical specialist vs. climate generalist: Diversification and demographic history of sister species of Carlia skinks from northwestern Australia

et al. 2017

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Species endemic to the tropical regions are expected to be vulnerable to future climate change due in part to their relatively narrow climatic niches. In addition, these species are more likely to have responded strongly to past climatic change, and this can be explored through phylogeographic analyses. To test the hypothesis that tropical specialists are more sensitive to climate change than climate generalists, we generated and analyse sequence data from mtDNA and ~2500 exons to compare scales of historical persistence and population fluctuation in two sister species of Australian rainbow skinks: the tropical specialist Carlia johnstonei and the climate generalist C. triacantha. We expect the tropical specialist species to have deeper and finer-scale phylogeographic structure and stronger demographic fluctuations relative to the closely related climate generalist species, which should have had more stable populations through periods of harsh climate in the late Quaternary. Within C. johnstonei, we find that some populations from the northern Kimberley islands are highly divergent from mainland populations. In C. triacantha, one major clade occurs across the deserts and into the mesic Top End, and another occurs primarily in the Kimberley with scattered records eastwards. Where their ranges overlap in the Kimberley, both mitochondrial DNA and nuclear DNA suggest stronger phylogeographic structure and range expansion within the tropical specialist, whereas the climate generalist has minimal structuring and no evidence of recent past range expansion. These results are consistent with the hypothesis that tropical specialists are more sensitive to past climatic change.

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“…Other populations are known for which host records do not exist, but these represent the majority of sites. (Francisco et al 2016) prior to the populations IVIT and TSAM being removed in the top figure (a) and after their removal below (b). (Marí-Mena et al 2016) in the top figure (a), and for Rosalia alpina (Drag et al 2015) below (b).…”

Section: Declaration By Authormentioning

confidence: 99%

“…In some cases, such as with the IBD plot for Bombus morio (Francisco et al 2016), the linear IBD relationship does not at all match the scatter of the IBD plot ( Figure S6.1). In cases such as this it is easy to justify removing the outliers, as including them confounds any attempt to meaningfully assess the IBD relationship.…”

Section: Host Breadth Host Distribution and Genetic Differentiationmentioning

confidence: 99%

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The interaction between diet breadth, geography and gene flow in herbivorous insects

Brookes¹

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The geographical distribution and life history of insects and their host plants determines when, and if, they will interact. The vast majority of herbivorous insects are host-plant specialists and their narrow host range limits their distribution and may also restrict gene flow between their populations. Generalist insect herbivores, by contrast, might be expected to have much higher gene flow across populations because the distribution of multiple host plant species is likely to be much more contiguous. Species distributions shift continually, so with enough time the populations of a specialist insect species should experience more events that fracture their distribution because of the changing distribution of their relatively fewer hosts. The changing distribution of insects and their host plants is thus important for mediating host-plant interactions and will also influence how and when adaptation to a host plant, or subset of host plants, occurs.To investigate the influence of geography and host breadth on gene flow, and thus speciation, I explore the evolutionary history and population genetic structure of two herbivorous insects with different host plant relationships, the generalist bug Nezara viridula (Pentatomidae, Hemiptera), a global pest species, and the specialist thrips Cycadothrips chadwicki (Aeolothripidae, Thysanoptera), the pollinator in a brood-site mutualism with Macrozamia cycads. The results from these systems were then integrated with other similar data sets from phytophagous insects to understand better how gene flow and host specificity relate to one another, and to examine the role each has played (and may still play) in the evolution of insect-plant interactions more generally.The pest bug N. viridula has two globally distributed mitochondrial lineages, the Asian (mtDNA lineage A) and the European (mtDNA lineage E), and the species status of these lineages has not been resolved. In Australia, I found that both of these N. viridula mitochondrial lineages were present.Microsatellite data show two genetically and geographically distinct populations, but these did not correspond directly to the two mitochondrial lineages. Together, mtDNA and microsatellite data shown that secondary contact has occurred in eastern Australia between the two lineages and has resulted in introgression of mtDNA lineage A into predominantly mtDNA lineage E populations in a narrow area, but without widespread introgression across the nuclear genome. Past research on this insect suggested that these lineages represented a single species because these mtDNA haplotypes were found together in single populations. The evidence presented here indicates that mating between lineages can occur, but that an analysis of mtDNA alone is not enough to understand the evolutionary history of these Conference abstracts for both of the above references can be found in Appendix 2. Publications included in thesis Contributor Statement of contribution Dean BrookesDesigned the study (50%), developed molecular tools (60%), cond...

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Genetic structure of island and mainland populations of a Neotropical bumble bee species

Cited by 19 publications

References 82 publications

Island biogeography theory explains the genetic diversity of a fragmented rock ptarmigan (Lagopus muta) population

Island biogeography theory explains the genetic diversity of a fragmented rock ptarmigan (Lagopus muta) population

Tropical specialist vs. climate generalist: Diversification and demographic history of sister species of Carlia skinks from northwestern Australia

The interaction between diet breadth, geography and gene flow in herbivorous insects

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