Landscape heterogeneity predicts gene flow in a widespread polymorphic bumble bee, Bombus bifarius (Hymenoptera: Apidae)

Lozier, Jeffrey D.; Strange, James P.; Koch, Jonathan B.

doi:10.1007/s10592-013-0498-3

Cited by 53 publications

(103 citation statements)

References 69 publications

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“…Unlike a quantitative variable, measuring integument color is often subjective in nature, requiring interpretation of the degree of color change or differences in color from one specimen to another, often on a qualitative scale (Mueller & Wolf-Mueller, 1993;Ruttner, 1988). While some studies have used quantitative approaches to measure bee setal color (Lozier et al, 2013), none have experimentally investigated how sun exposure affects the integument or setal color of a bee. Quantitatively determining the effect of sun exposure on insect integument or setae will provide another metric to estimate bee age.…”

Section: Journal Of Melittologymentioning

confidence: 99%

“…We chose to analyze H, which is a component of the Hue, Saturation, and Lightness (HSL) digital color model and has been successfully quantified in a handful of insect studies (Davis et al, 2007;Lozier et al, 2013). All images were standardized to the 18% gray card using Adobe Photoshop CS2 (Adobe, San Jose, CA).…”

Section: Journal Of Melittologymentioning

confidence: 99%

“…Furthermore, qualitative measurements of setal color lightening has revealed a strong correlation with wing wear, with highly worn out wings correlated with lightened insect integument (Mueller & Wolf-Mueller, 1993). While several studies have quantified color with a digital color model (Davis et al, 2007;Lozier et al, 2013), no study has formally articulated the relationship between the quantitative measurements of color and wing wear. Our quantitative approach Figure 2.…”

Section: Journal Of Melittologymentioning

confidence: 99%

“…The addition of setal photobleaching will add another metric for investigations into the ecology and evolution of bees. Objectively measuring color with properties of the digital color model has the capacity to fuel investigations in bee evolution and ecology (Cartar, 1992;Lozier et al, 2013;Rodd et al, 1980). Our study is limited to an investigation of photobleaching of red setae on the dorsum of the mesosoma or metasoma of three bee species.…”

Section: Journal Of Melittologymentioning

confidence: 99%

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The effect of photobleaching on bee (Hymenoptera: Apoidea) setae color and its implications for studying aging and behavior

et al. 2014

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Abstract. Historically, bee age has been estimated using measurements of wing wear and integument color change. These measurements have been useful in studies of foraging ecology and plant-pollinator interactions. Wing wear is speculated to be affected by the behaviors associated with foraging, nesting, and mating activities. Setal color change may be an additional parameter used to measure bee age if it is affected by sun exposure during these same activities. The objectives of this study were to experimentally assess the effect of direct sun exposure on setal color, unicellular hair-like processes of the integument, and determine whether wing wear and integument photobleaching are correlated. To quantify photobleaching of setae, we measured changes in hue of lab-reared Bombus huntii Greene (Apidae) exposed to natural sunlight. We found that sun exposure was a significant variable in determining setal bleaching. To assess the relationship between wing wear and setal photobleaching, we scored wing wear and measured setal hue of B. huntii, Melecta pacifica fulvida Cresson (Apidae), and Osmia integra Cresson (Megachilidae) from museum specimens. Wing wear and setal hue values were positively correlated for all three species; however, the strength of the relationship varies across bee species as indicated by correlation coefficient estimates. Our results suggest that setal color change is affected by sun exposure, and is likely an accurate estimate of bee age. We suggest that future investigations of bee aging consider a suite of morphometric characteristics due to differences in natural history and sociobiology that may be confounded by the use of a single characteristic.

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Section: Journal Of Melittologymentioning

confidence: 99%

Section: Journal Of Melittologymentioning

confidence: 99%

Section: Journal Of Melittologymentioning

confidence: 99%

Section: Journal Of Melittologymentioning

confidence: 99%

See 2 more Smart Citations

The effect of photobleaching on bee (Hymenoptera: Apoidea) setae color and its implications for studying aging and behavior

et al. 2014

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“…This approach takes into account the effect of all alternative pathways between habitat patches, which is especially appropriate when the specific aim is to assess gene flow across a landscape over many generations. Several studies indicated that resistance distances may allow for better assessment of genetic isolation-by-distance than the usual Euclidean or least-cost-path distance because the metric is based on assumptions about the impact of many alternative routes in the entire landscape on the dispersal of individuals, and consequently on the chances of gene flow (McRae and Beier 2007;Schwartz et al 2009;Lozier et al 2013). Despite the theoretical superiority of isolation-by-resistance approach over distance measures assuming a single optimal path, the performance of the these approaches have rarely been evaluated with empirical data sets at finer spatial scales (Row et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Rural avenues as dispersal corridors for the vulnerable saproxylic beetle Elater ferrugineus in a fragmented agricultural landscape

et al. 2015

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Understanding factors that limit gene flow through the landscape is crucial for conservation of organisms living in fragmented habitats. We analysed patterns of gene flow in Elater ferrugineus, an endangered click beetle living in old-growth, hollow trees in a network of rural avenues surrounded by inhospitable arable land. Using amplified fragment length polymorphism (AFLP) data, we aimed to evaluate if the landscape features important for the beetle's development are also important for its dispersal. By dividing the sampling area into 30 9 30 m cells, with each cell categorised into one of four classes according to its putative permeability for dispersing beetles, and by correlating matrices of genetic and landscape resistance distances, we evaluated which of the landscape models had the best fit with the observed kinship structure. Significant correlations between genetic and Euclidean distances were detected, which indicated that restricted dispersal is the main constraint driving differentiation between populations of E. ferrugineus. Out of 81 landscape models in total, 54 models yielded significantly weaker correlation between matrices of pairwise kinship and effective distances than the null model. Regression analysis pointed to avenues as having the highest and positive impact on the concordance between matrices of kinship and landscape distances, while open arable land had the opposite effect. Our study thus shows that tree avenues can function as efficient dispersal corridors for E. ferrugineus, highlighting the importance of saving such avenues to increase the connectivity among suitable habitat patches, thereby reducing the risk of local extinctions of E. ferrugineus as well as other saproxylic organisms.

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Population genomics of divergence among extreme and intermediate color forms in a polymorphic insect

Lozier

Jackson

Dillon

et al. 2016

Ecology and Evolution

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Geographic variation in insect coloration is among the most intriguing examples of rapid phenotypic evolution and provides opportunities to study mechanisms of phenotypic change and diversification in closely related lineages. The bumble bee Bombus bifarius comprises two geographically disparate color groups characterized by red‐banded and black‐banded abdominal pigmentation, but with a range of spatially and phenotypically intermediate populations across western North America. Microsatellite analyses have revealed that B. bifarius in the USA are structured into two major groups concordant with geography and color pattern, but also suggest ongoing gene flow among regional populations. In this study, we better resolve the relationships among major color groups to better understand evolutionary mechanisms promoting and maintaining such polymorphism. We analyze >90,000 and >25,000 single‐nucleotide polymorphisms derived from transcriptome (RNAseq) and double digest restriction site associated DNA sequencing (ddRAD), respectively, in representative samples from spatial and color pattern extremes in B. bifarius as well as phenotypic and geographic intermediates. Both ddRAD and RNAseq data illustrate substantial genome‐wide differentiation of the red‐banded (eastern) color form from both black‐banded (western) and intermediate (central) phenotypes and negligible differentiation among the latter populations, with no obvious admixture among bees from the two major lineages. Results thus indicate much stronger background differentiation among B. bifarius lineages than expected, highlighting potential challenges for revealing loci underlying color polymorphism from population genetic data alone. These findings will have significance for resolving taxonomic confusion in this species and in future efforts to investigate color‐pattern evolution in B. bifarius and other polymorphic bumble bee species.

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Landscape heterogeneity predicts gene flow in a widespread polymorphic bumble bee, Bombus bifarius (Hymenoptera: Apidae)

Cited by 53 publications

References 69 publications

The effect of photobleaching on bee (Hymenoptera: Apoidea) setae color and its implications for studying aging and behavior

The effect of photobleaching on bee (Hymenoptera: Apoidea) setae color and its implications for studying aging and behavior

Rural avenues as dispersal corridors for the vulnerable saproxylic beetle Elater ferrugineus in a fragmented agricultural landscape

Population genomics of divergence among extreme and intermediate color forms in a polymorphic insect

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