Genetic and biometric variation across the fragmented range of Jerdon’s Babbler, Chrysomma altirostre, a threatened Oriental grassland specialist

Sadanandan, Keren R.; Olsson, Urban; Tizard, Robert; Khan, Aleem Ahmed; Naing, Thet Zaw; Lin, Naing; Pwint, Nila; Rheindt, Frank E.

doi:10.1007/s10336-018-1530-7

Cited by 3 publications

(1 citation statement)

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“…These mountains are a known barrier to dispersal across multiple vertebrate lineages, with recent demonstrations of deep, species‐level divergence in bats (Puechmaille et al., 2011) and bulbuls (Garg et al., 2016). In contrast, the genomic proximity of contra and superciliaris suggests that the Indo‐Burmese mountain range (Arakan mountains, Chin Hills, Naga Hills) is not an effective barrier to gene flow in these starlings (Figure 2), corroborating results from studies on other lowland vertebrates (e.g., Iyengar et al., 2005; Sadanandan et al., 2018).…”

Section: Discussionsupporting

confidence: 83%

Using historical genome‐wide DNA to unravel the confused taxonomy in a songbird lineage that is extinct in the wild

Baveja

Garg

Chattopadhyay

et al. 2020

Evolutionary Applications

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Conservation action is ideally based on adequate scientific data (Rose et al., 2019). A lack of clarity over species boundaries may often lead to failed conservation action (Ely et al., 2017). Critically endangered taxa, or those extinct in the wild, pose a particular dilemma, as surviving individuals are often inaccessible to taxonomists and susceptible to genetic admixture, making historical museum material the only reliable source of taxonomic information (Payne & Sorenson, 2002). With the emergence and continuous advancement of next-generation sequencing and related bioanalytical pipe

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Section: Discussionsupporting

confidence: 83%

Using historical genome‐wide DNA to unravel the confused taxonomy in a songbird lineage that is extinct in the wild

Baveja

Garg

Chattopadhyay

et al. 2020

Evolutionary Applications

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A review of Gloger's rule, an ecogeographical rule of colour: definitions, interpretations and evidence

2019

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Gloger's rule is an ecogeographical rule that links animal colouration with climatic variation. This rule is named after C.W.L. Gloger who was one of the first to summarise the associations between climatic variation and animal colouration, noting in particular that birds and mammals seemed more pigmented in tropical regions. The term 'Gloger's rule' was coined by B. Rensch in 1929 and included different patterns of variation from those described by Gloger. Rensch defined the rule in two ways: a simple version stating that endothermic animals are predicted to be darker in warmer and humid areas due to the increased deposition of melanin pigments; and a complex version that includes the differential effects of humidity and temperature on both main types of melanin pigments -eu-and phaeo-melanin. The blackish eu-melanins are predicted to increase with humidity, and decrease only at extreme low temperatures, while the brown-yellowish phaeomelanins prevail in dry and warm regions and decrease rapidly with lower temperatures. A survey of the literature indicates that there is considerable variation/confusion in the way Gloger's rule is understood (based on 271 studies that define the rule). Whereas the complex version is hardly mentioned, only a quarter of the definitions are consistent with the simple version of Gloger's rule (darker where warm and wet), and most definitions mention only the effects of humidity (darker where wet). A smaller subset of studies define the rule based on other correlated climatic and environmental variables such as vegetation, latitude, altitude, solar radiation, etc., and a few even contradict the original definition (darker where cold). Based on the literature survey, I synthesised the qualitative (N = 124 studies) and quantitative (meta-analytically, N = 38 studies, 241 effects) evidence testing the simple version of Gloger's rule (I found no tests of the complex version). Both lines of evidence supported the predicted effects of humidity (and closely linked variables) on colour variation, but not the effects of temperature. Moreover, humidity effects are not restricted to birds and mammals, as the data indicate that these effects also apply to insects. This suggests that the simple version of Gloger's rule as originally defined may not be valid, and possibly that the rule should be re-formulated in terms of humidity effects only. I suggest, however, that more data are needed before such a reformulation, due to potential publication biases. In conclusion, I recommend that authors cite Rensch when referring to Gloger's rule and that they make clear which version they are referring to. Future research should concentrate on rigorously testing the validity and generality of both versions of Gloger's rule and establishing the mechanism(s) responsible for the patterns it describes. Since humidity seems to be the core climatic variable behind Gloger's rule, I suggest that the two most plausible mechanisms are camouflage and protection against parasites/pathogens, the latter possibly through p...

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Jerdon's Babbler (Chrysomma altirostre)

Krishnan

2023

Birds of the World

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Genetic and biometric variation across the fragmented range of Jerdon’s Babbler, Chrysomma altirostre, a threatened Oriental grassland specialist

Cited by 3 publications

References 11 publications

Using historical genome‐wide DNA to unravel the confused taxonomy in a songbird lineage that is extinct in the wild

Using historical genome‐wide DNA to unravel the confused taxonomy in a songbird lineage that is extinct in the wild

A review of Gloger's rule, an ecogeographical rule of colour: definitions, interpretations and evidence

Jerdon's Babbler (Chrysomma altirostre)

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