Cryptic species as a window on diversity and conservation

Bickford, David; Lohman, David J.; Sodhi, Navjot S.; Ng, Peter K. L.; Meier, Rudolf; Winker, Kevin; Ingram, Krista K.; Das, Indraneil

doi:10.1016/j.tree.2006.11.004

Cited by 2,885 publications

(2,709 citation statements)

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“…These four new species were separated based on fixed sequence polymorphisms located within up to five gene regions and appear to have undergone morphologically static cladogenesis i.e. speciation without morphological differentiation (Bickford et al, 2007), in fact morphological characters overlap between the six species of the N. parvum-N. ribis complex, supporting their classification as a species complex.…”

Section: Introductionmentioning

confidence: 93%

Use of the Genealogical Sorting Index (GSI) to delineate species boundaries in the Neofusicoccum parvum–Neofusicoccum ribis species complex

Sakalidis

Hardy

Burgess

2011

Molecular Phylogenetics and Evolution

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Section: Introductionmentioning

confidence: 93%

Use of the Genealogical Sorting Index (GSI) to delineate species boundaries in the Neofusicoccum parvum–Neofusicoccum ribis species complex

Sakalidis

Hardy

Burgess

2011

Molecular Phylogenetics and Evolution

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“…Many animal taxa likely harbor cryptic species (Bickford et al. 2007), leaving assessments of the efficacy of COX1 barcoding uncertain in many taxa.…”

Section: Introductionmentioning

confidence: 99%

Mitonuclear coevolution as the genesis of speciation and the mitochondrial DNA barcode gap

Hill

2016

Ecology and Evolution

142

178

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Mitochondrial genes are widely used in taxonomy and systematics because high mutation rates lead to rapid sequence divergence and because such changes have long been assumed to be neutral with respect to function. In particular, the nucleotide sequence of the mitochondrial gene cytochrome c oxidase subunit 1 has been established as a highly effective DNA barcode for diagnosing the species boundaries of animals. Rarely considered in discussions of mitochondrial evolution in the context of systematics, speciation, or DNA barcodes, however, is the genomic architecture of the eukaryotes: Mitochondrial and nuclear genes must function in tight coordination to produce the complexes of the electron transport chain and enable cellular respiration. Coadaptation of these interacting gene products is essential for organism function. I extend the hypothesis that mitonuclear interactions are integral to the process of speciation. To maintain mitonuclear coadaptation, nuclear genes, which code for proteins in mitochondria that cofunction with the products of mitochondrial genes, must coevolve with rapidly changing mitochondrial genes. Mitonuclear coevolution in isolated populations leads to speciation because population‐specific mitonuclear coadaptations create between‐population mitonuclear incompatibilities and hence barriers to gene flow between populations. In addition, selection for adaptive divergence of products of mitochondrial genes, particularly in response to climate or altitude, can lead to rapid fixation of novel mitochondrial genotypes between populations and consequently to disruption in gene flow between populations as the initiating step in animal speciation. By this model, the defining characteristic of a metazoan species is a coadapted mitonuclear genotype that is incompatible with the coadapted mitochondrial and nuclear genotype of any other population.

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“…The number of uncovered complexes of cryptic lineages-in various habitats-has substantially increased over the past decades as a result of relatively cheap and fast DNA sequencing methods (Bickford et al 2007). The benthic environment in freshwater ecosystems, which provides conditions leading to strong selective constraints on morphological evolution, is a habitat encouraging the development of cryptic lineage complexes (Sturmbauer et al 1999).…”

Section: Referencesmentioning

confidence: 99%

“…Resulting genetic differentiations among cryptic lineages can reach levels similar to those between nominal species (Feckler et al 2012). Deviations regarding behavioral and physiological characteristics within cryptic complexes are conceivable (Bickford et al 2007). …”

Section: Referencesmentioning

confidence: 99%

“…Ecotoxicology assumes that traits of species, like sensitivity toward chemical stressors, only vary around one mean value. However, the concept of cryptic lineage complexes, which has been considered a taxonomic challenge for nearly 300 years (Bickford et al 2007), is largely ignored in ecotoxicology. These complexes are defined as 2 or more distinct lineages with at least a superficially morphological equality that are misleadingly merged as one nominal species but still, however, exhibiting meaningful genetic differentiations.…”

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confidence: 99%

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