Patterns of Allozyme, Mitochondrial DNA, and Morphometric Variation in Four Sparrow Genera

Zink, Robert M.; Blackwell, Rachelle C.

doi:10.2307/4088935

Cited by 78 publications

(30 citation statements)

References 22 publications

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“…Initially, researchers used mitochondrial (mt) DNA markers to find that Song Sparrows represent a single monophyletic lineage that recently colonized most of its current distribution (Hare and Shields 1992, Zink and Dittmann 1993, Zink and Blackwell 1996, Fry and Zink 1998. However, a general lack of concordance between recognized subspecies and the distribution of mtDNA haplotypes suggests that subspecific differentiation in Song Sparrows arose more rapidly than mtDNA variation could track (Zink and Dittmann 1993).…”

Section: Señales Concordantes Y Discordantes Entre Datos Genéticos Y mentioning

confidence: 99%

Concordant and Discordant Signals Between Genetic Data and Described Subspecies of Pacific Coast Song Sparrows

Pruett

Arcese

Chan

et al. 2008

Condor

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Song Sparrows (Melospiza melodia) provide one of North America's best examples of geographic variation in phenotype, with approximately 26 described subspecies recognized. However, researchers have found inconsistent signals when making comparisons between subspecies and genetic markers. We examined seven microsatellite loci from 576 Song Sparrows of 23 western North American populations representing 13 recognized subspecies. We assessed the level of concordance between microsatellite genotypes and subspecies. We found that in some, but not all, instances neutral genetic structure corresponded to recognized phenotypic structure. However, some populations not currently recognized as subspecies were found to be genetically differentiated from all other populations that are considered to be the same subspecies. We suggest that a combination of phenotypic characters, behavioral traits, and multiple loci be used when assessing geographic variation in birds, and that sampling should be conducted in more than one location within broadly distributed subspecies. Abstract. Song Sparrows (Melospiza melodia) provide one of North America's best examples of geographic variation in phenotype, with approximately 26 described subspecies recognized. However, researchers have found inconsistent signals when making comparisons between subspecies and genetic markers. We examined seven microsatellite loci from 576 Song Sparrows of 23 western North American populations representing 13 recognized subspecies. We assessed the level of concordance between microsatellite genotypes and subspecies. We found that in some, but not all, instances neutral genetic structure corresponded to recognized phenotypic structure. However, some populations not currently recognized as subspecies were found to be genetically differentiated from all other populations that are considered to be the same subspecies. We suggest that a combination of phenotypic characters, behavioral traits, and multiple loci be used when assessing geographic variation in birds, and that sampling should be conducted in more than one location within broadly distributed subspecies.

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Section: Señales Concordantes Y Discordantes Entre Datos Genéticos Y mentioning

confidence: 99%

Concordant and Discordant Signals Between Genetic Data and Described Subspecies of Pacific Coast Song Sparrows

Pruett

Arcese

Chan

et al. 2008

Condor

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“…Golden-crowned sparrows and white-crowned sparrows are sister species (Carson and Spicer, 2003;Weckstein et al, 2001;Zink and Blackwell, 1996) that share sympatric breeding ranges in western North America. While there are occasional reports of hybrids (Miller, 1940), the two species are not known to maintain any hybrid zones.…”

Section: S H I Z U K a I N A N I M A L B E H A V I O U R 9 2 ( 2 mentioning

confidence: 99%

Early song discrimination by nestling sparrows in the wild

Shizuka

2014

Animal Behaviour

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“…All four congeners of Z. capensis (Zonotrichia leucophrys, Zonotrichia atricapilla, Zonotrichia albicollis and Zonotrichia querula) winter in the north temperate zone, breed at temperate, subarctic and Arctic latitudes, and spontaneously regress gonads when held on constant long days. Z. capensis has been shown by a variety of phylogenetic methods to be the most basal lineage in the genus (Zink 1982;Zink et al 1991;Zink & Blackwell 1996;Patten & Fugate 1998). Thus, the overall distribution of absolute refractoriness criterion 1 within Zonotrichia and among near out-groups (Melospiza, Junco and Spizella) suggests that this trait was lost as an adaptive specialization to breeding at low latitudes along the lineage leading directly to Z. capensis, but retained as an ancestral trait in the lineage leading to all other Zonotrichia.…”

Section: Case Study: Absolute Refractoriness In Songbirds In Generalmentioning

confidence: 99%

Adaptive specialization, conditional plasticity and phylogenetic history in the reproductive cue response systems of birds

Hahn

MacDougall‐Shackleton

2007

Phil. Trans. R. Soc. B

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Appropriately timed integration of breeding into avian annual cycles is critical to both reproductive success and survival. The mechanisms by which birds regulate timing of breeding depend on environmental cue response systems that regulate both when birds do and do not breed. Despite there being multiple possible explanations for birds' abilities to time breeding appropriately in different environments, and for the distribution of different cue response system characteristics among taxa, many studies infer that adaptive specialization of cue response systems has occurred without explicitly considering the alternatives. In this paper, we make explicit three hypotheses concerning the timing of reproduction and distribution of cue response characteristics among taxa: adaptive specialization; conditional plasticity; and phylogenetic history. We emphasize in particular that although conditional plasticity built into avian cue response systems (e.g. differing rates of gonadal development and differing latencies until onset of photorefractoriness) may lead to maladaptive annual cycles in some novel circumstances, this plasticity also can lead to what appear to be adaptively specialized cue response systems if not viewed in a comparative context. We use a comparative approach to account for the distribution of one important feature of avian reproductive cue response systems, photorefractoriness. Analysis of the distribution within songbirds of one criterion for absolute photorefractoriness, the spontaneous regression of the gonads without any decline in photoperiod, reveals that a failure to display this trait probably represents an adaptive specialization to facilitate a flexible reproductive schedule. More finely resolved analysis of both criteria for absolute photorefractoriness (the second being total lack of a reproductive response even to constant light after gonadal regression has occurred) within the cardueline finches not only provides further confirmation of this interpretation, but also indicates that these two criteria for photorefractoriness can be, and have been, uncoupled in some taxa. We suggest that careful comparative studies at different phylogenetic scales will be extremely valuable for distinguishing between adaptive specialization and non-adaptive explanations, such as phylogenetic history as explanations of cue response traits in particular taxa. We also suggest that particular focus on taxa in which individuals may breed on very different photoperiods (latitudes or times of year) in different years should be particularly valuable in identifying the range of environmental conditions across which conditionally plastic cue responses can be adaptive.

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Patterns of Allozyme, Mitochondrial DNA, and Morphometric Variation in Four Sparrow Genera

Cited by 78 publications

References 22 publications

Concordant and Discordant Signals Between Genetic Data and Described Subspecies of Pacific Coast Song Sparrows

Concordant and Discordant Signals Between Genetic Data and Described Subspecies of Pacific Coast Song Sparrows

Early song discrimination by nestling sparrows in the wild

Adaptive specialization, conditional plasticity and phylogenetic history in the reproductive cue response systems of birds

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