The Song Sparrow, Melospiza melodia, as a ring species: Patterns of geographic variation, a revision of subspecies, and implications for speciation

@article{Patten2009TheSS,
  title={The Song Sparrow, Melospiza melodia, as a ring species: Patterns of geographic variation, a revision of subspecies, and implications for speciation},
  author={Michael A. Patten and Christin L. Pruett},
  journal={Systematics and Biodiversity},
  year={2009},
  volume={7},
  pages={33 - 62}
}
Abstract Identification and analysis of ring species are important to our understanding of evolution and speciation. We review geographic variation in the Song Sparrow (Melospiza melodia) in the context of a ring species, one of few known from the highly vagile class Aves. Although 52 subspecies have been named, our reassessment of morphological variation across the entire species reveals that 25 subspecies are diagnosable throughout the species’ range, which includes much of the North American… 

Evolution and Historical Biogeography of a Song Sparrow Ring in Western North America

TLDR
Biogeographical and morphological data support the latter, more radical interpretation, but genetic, vocal, ecological, and behavioral data are needed around the ring to determine conclusively which model is best supported.

Chapter 13: Alaska Song Sparrows (Melospiza Melodia) Demonstrate that Genetic Marker and Method of Analysis Matter in Subspecies Assessments

TLDR
Examination of genetic and morphological characteristics of the Song Sparrows of northwestern North America showed little information about these subspecies, with no reciprocal monophyly evident; however, differences in body mass and microsatellite allele frequencies supported continued recognition of subspecific units for taxonomy and conservation.

Integrative taxonomy of an arctic bumblebee species complex highlights a new cryptic species (Apidae: Bombus)

TLDR
An integrative taxonomic approach based on novel genetic and eco- eco-chemical datasets is used to resolve the taxonomic status of Bombus lapponicus and B. sylvicola and reveals a new cryptic arctic species in the B. lappicola-Pyrobombus complex.

Ring Species and Speciation

TLDR
These species are particularly helpful in understanding how microevolutionary changes can create two unique species, how speciation can occur in spite of gene flow, and how geographic speciation with or without adaptive divergence can occur.

Ring Species and Speciation

TLDR
Ring species are helpful tools that can be used to help elucidate evolutionary processes and are particularly helpful in understanding how microevolutionary changes can create two unique species, how speciation can occur in spite of gene flow, and how geographic speciation with or without adaptive divergence can occur.

Genomic differentiation and local adaptation on a microgeographic scale in a resident songbird

TLDR
The results offer evidence of microgeographic specialization in a highly polytypic bird species long discussed as a model of sympatric speciation and rapid adaptation, and they support the hypothesis that conserving locally adapted populations may be critical to the range‐wide persistence of similarly highly variable species.

Maintenance of local adaptation despite gene flow in a coastal songbird

TLDR
A phenotype under divergent selection, bill size, varied with the amount of coastal ancestry in transitional areas, but larger bill size was maintained in coastal habitats regardless of ancestry, further supporting a role for selection in the maintenance of these subspecies.

Drawbacks with the use of microsatellites in phylogeography: the song sparrow Melospiza melodia as a case study

TLDR
Reanalyzing microsatellites on the song sparrow shows that the data do not support any particular population or subspecies as being genetically or evolutionarily significant, and suggests that for testing subspecies limits, a gene tree is preferable.

Ring Species and Speciation

TLDR
The study of species with ring distributions has provided information about the processes that cause population divergence through time, and the use of new genomics and modelling tools could provide valuable insights into how geographic speciation, with or without adaptive divergence, could occur.

The evolutionary ecology of a species ring: a test of alternative models

TLDR
Song sparrows do fit some aspects of a classic ring species that formed via expansion around a barrier; however, admixture rather than complete reproductive isolation occurred when populations met at the terminus of the ring in southern California.

References

SHOWING 1-10 OF 174 REFERENCES

SUBSPECIFIC DIFFERENTIATION AND CONSERVATION OF SONG SPARROWS (MELOSPIZA MELODIA) IN THE SAN FRANCISCO BAY REGION INFERRED BY MICROSATELLITE LOCI ANALYSIS

TLDR
It is proposed that a management unit encompassing the range of M. m.

SONG VARIATION IN AN AVIAN RING SPECIES

  • D. Irwin
  • Biology, Environmental Science
    Evolution; international journal of organic evolution
  • 2000
TLDR
It is suggested that parallel south-to-north ecological gradients have caused a greater intensity ofSexual selection on song in northern populations and that the stochastic effects of sexual selection have led to divergence in song structure.

The herring gull complex is not a ring species

TLDR
Based on mitochondrial DNA variation among 21 gull taxa, it is shown that members of this complex differentiated largely in allopatry following multiple vicariance and long–distance–colonization events, not primarily through isolation by distance.

Amak Island Song Sparrows (Melospiza melodia amaka) are not evolutionarily significant

TLDR
It is proposed that the isolated, small, and endemic population of Amak Island Song Sparrows is not an evolutionarily significant unit (ESU), not a valid subspecies, not a distinct population segment (DPS), nor a diagnosable conservation unit, but rather a sink colonized by regional source populations.

GENE FLOW, REFUGIA, AND EVOLUTION OF GEOGRAPHIC VARIATION IN THE SONG SPARROW (MELOSPIZA MELODIA)

TLDR
It is suggested that postglaciation dispersal scattered mtDNA haplotypes across the continent, explaining the lack of mtDNA geographic patterns in song sparrows.

HABITAT SELECTION, ACOUSTIC ADAPTATION, AND THE EVOLUTION OF REPRODUCTIVE ISOLATION

TLDR
The association of song and plumage with the environment and in turn with assortative mating suggests a means by which reproductive isolation may evolve or be maintained in hybrid zones and suggests limited gene flow between the taxa.

EVOLUTIONARY RELATIONSHIPS WITHIN THE ENSATINA ESCHSCHOLTZII COMPLEX CONFIRM THE RING SPECIES INTERPRETATION

TLDR
Division of this complex into separate species on the basis of the observed patterns of monophyly for mitochondrial DNA is unwarranted because further sampling could reveal additional instances of paraphyly across subspecies and, more generally, because mtDNA alone should not be used to infer species boundaries.

PROBLEMS WITH SPECIES: PATTERNS AND PROCESSES OF SPECIES FORMATION IN SALAMANDERS1

  • D. Wake
  • Biology, Environmental Science
  • 2006
TLDR
Analysis of patterns of genetic differentiation in allozymes and mtDNA in relation to the geological history of California is used to generate biogeographic scenarios to help explain the contrast between Batrachoseps and Ensatina.

The effects of contemporary processes in maintaining the genetic structure of western song sparrows (Melospiza melodia)

TLDR
It is suggested that geographic isolation and limited gene flow facilitated by migratory behavior are responsible for maintaining observed levels of differentiation among Pacific coastal song sparrow populations.

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

TLDR
It is suggested 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.
...