ASYMMETRIC VIABILITY OF RECIPROCAL-CROSS HYBRIDS BETWEEN CRESTED AND MARBLED NEWTS (<i>TRITURUS CRISTATUS</i>AND<i>T. MARMORATUS</i>)

Arntzen, Jan W.; Jehle, Robert; Bardakçı, Fevzi; Burke, Terry; Wallis, Graham P.

doi:10.1111/j.1558-5646.2009.00611.x

Cited by 81 publications

(102 citation statements)

References 117 publications

(139 reference statements)

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“…Asymmetries in reproductive isolation are frequently reported when interspecific hybridisation occurs [25], [26], [27], typically arising from genetic constraints or asymmetric costs for the particular species or sex [25], [28]. In our study system, a combination of asymmetry in sex-specific reproductive costs and genetic incompatibility are both plausible explanations.…”

Section: Discussionmentioning

confidence: 66%

Asymmetric Reproductive Isolation between Two Sympatric Annual Killifish with Extremely Short Lifespans

Polačik

Reichard

2011

PLoS ONE

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BackgroundInterspecific reproductive isolation is typically achieved by a combination of intrinsic and extrinsic barriers. Behavioural isolating barriers between sympatric, closely related species are often of primary importance and frequently aided by extrinsic factors causing spatial and temporal interspecific separation. Study systems with a severely limited role of extrinsic factors on reproductive isolation may provide valuable insights into how reproductive isolation between sympatric species is maintained. We used no-choice experimental set-up to study reproductive barriers between two closely related sympatric African killifish species, Nothobranchius furzeri and Nothobranchius orthonotus. These fish live in small temporary savannah pools and have complete spatial and temporal overlap in reproductive activities and share a similar ecology.Principal FindingsWe found that the two species display largely incomplete and asymmetric reproductive isolation. Mating between N. furzeri males and N. orthonotus females was absent under standard experimental conditions and eggs were not viable when fish were forced to mate in a modified experimental setup. In contrast, male N. orthonotus indiscriminately mated with N. furzeri females, the eggs were viable, and offspring successfully hatched. Most spawnings, however, were achieved by male coercion and egg production and embryo survival were low. Behavioural asymmetry was likely facilitated by mating coercion from larger males of N. orthonotus and at relatively low cost to females. Interestingly, the direction of asymmetry was positively associated with asymmetry in post-mating reproductive barriers.SignificanceWe showed that, in fish species with a promiscuous mating system and multiple matings each day, selection for strong mate preferences was relaxed. This effect was likely due to the small proportion of resources allocated to each single mating and the high potential cost to females from mating refusal. We highlight and discuss the fact that males of rarer species may often coercively mate with females of a related, more abundant species.

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Section: Discussionmentioning

confidence: 66%

Asymmetric Reproductive Isolation between Two Sympatric Annual Killifish with Extremely Short Lifespans

Polačik

Reichard

2011

PLoS ONE

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“…Given that A. zebra will normally be smaller than A. taeniatus , this may have facilitated sneaking behaviour by male A. zebra during reproduction, leading to asymmetrical hybridisation, as observed in other fish species ([66]). Asymmetrical hybridisation can also arise from differences in the relative abundance of parental species, with the less common species typically becoming the female parent [67], and from Dobzhansky-Muller incompatibilities, whereby reciprocal interspecific crosses produce different rates of fertilization and/or sterility [68].…”

Section: Discussionmentioning

confidence: 99%

DNA Barcoding and Microsatellites Help Species Delimitation and Hybrid Identification in Endangered Galaxiid Fishes

et al. 2012

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The conservation of data deficient species is often hampered by inaccurate species delimitation. The galaxiid fishes Aplochiton zebra and Aplochiton taeniatus are endemic to Patagonia (and for A. zebra the Falkland Islands), where they are threatened by invasive salmonids. Conservation of Aplochiton is complicated because species identification is hampered by the presence of resident as well as migratory ecotypes that may confound morphological discrimination. We used DNA barcoding (COI, cytochrome b) and a new developed set of microsatellite markers to investigate the relationships between A. zebra and A. taeniatus and to assess their distributions and relative abundances in Chilean Patagonia and the Falkland Islands. Results from both DNA markers were 100% congruent and revealed that phenotypic misidentification was widespread, size-dependent, and highly asymmetric. While all the genetically classified A. zebra were correctly identified as such, 74% of A. taeniatus were incorrectly identified as A. zebra, the former species being more widespread than previously thought. Our results reveal, for the first time, the presence in sympatry of both species, not only in Chilean Patagonia, but also in the Falkland Islands, where A. taeniatus had not been previously described. We also found evidence of asymmetric hybridisation between female A. taeniatus and male A. zebra in areas where invasive salmonids have become widespread. Given the potential consequences that species misidentification and hybridisation can have for the conservation of these endangered species, we advocate the use of molecular markers in order to reduce epistemic uncertainty.

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“…Disassociation of the coadapted mitochondrial and nuclear genomes, e.g. as a result of hybridization (Arntzen et al, 2009;Burton et al, 2006;Hofman and Szymura, 2007;Yanchukov et al, 2006) or experimental manipulation (James and Ballard, 2003;McKenzie et al, 2003), has the potential to decrease the fitness of the resulting progeny. In general the greater the degree of divergence between two species the higher the chances that cytonuclear incompatibility will lead to hybrid breakdown.…”

Section: Introductionmentioning

confidence: 99%

Mitochondrial genome organization and divergence in hybridizing central European waterfrogs of the Pelophylax esculentus complex (Anura, Ranidae)

Hofman

Pabijan

Dziewulska‐Szwajkowska

et al. 2012

Gene

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ASYMMETRIC VIABILITY OF RECIPROCAL-CROSS HYBRIDS BETWEEN CRESTED AND MARBLED NEWTS (TRITURUS CRISTATUSANDT. MARMORATUS)

Cited by 81 publications

References 117 publications

Asymmetric Reproductive Isolation between Two Sympatric Annual Killifish with Extremely Short Lifespans

Asymmetric Reproductive Isolation between Two Sympatric Annual Killifish with Extremely Short Lifespans

DNA Barcoding and Microsatellites Help Species Delimitation and Hybrid Identification in Endangered Galaxiid Fishes

Mitochondrial genome organization and divergence in hybridizing central European waterfrogs of the Pelophylax esculentus complex (Anura, Ranidae)

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