TEMPERATURE-BASED EXTRINSIC REPRODUCTIVE ISOLATION IN TWO SPECIES OF<i>DROSOPHILA</i>

Matute, Daniel R.; Novak, Caroline J.; Coyne, Jerry A.

doi:10.1111/j.1558-5646.2008.00588.x

Cited by 79 publications

(109 citation statements)

References 53 publications

(70 reference statements)

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“…Two other Drosophila species, D. yakuba and D. santomea , have non-conservative changes in the TAGteam sites (Figure S6F). D. yakuba is found throughout sub-Saharan Africa, while its sister species D. santomea is endemic to the island of São Tomé [25–27]. Consistent with the changes in TAGteam sequences, the only detectable zen expression in early Stage 5 embryos of D. yakuba and D. santomea is a faint anterior dorsal band (Figures 4C and 4E).…”

Section: Resultssupporting

confidence: 56%

A Genetic Network Conferring Canalization to a Bistable Patterning System in Drosophila

et al. 2013

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SUMMARY To achieve the “constancy of the wild type,” the developing organism must be buffered against stochastic fluctuations and environmental perturbations [1]. This phenotypic buffering has been theorized to arise from a variety of genetic mechanisms [2] and is widely thought to be adaptive and essential for viability. In the Drosophila blastoderm embryo, staining with antibodies against the active, phosphorylated form of the Bone Morphogenetic Protein (BMP) signal transducer Mad, pMad [3, 4], or visualization of the spatial pattern of BMP-receptor interactions [5] reveals a spatially bistable pattern of BMP signaling centered on the dorsal midline. This signaling event is essential for the specification of dorsal cell fates, including the extraembryonic amnioserosa [5–7]. BMP signaling is initiated by facilitated extracellular diffusion [4, 8] that localizes BMP ligands dorsally. BMP signaling then activates an intracellular positive feedback circuit that promotes future BMP-receptor interactions [5, 6]. Here, we identify a genetic network comprising three genes that canalizes this BMP signaling event. The BMP target eiger (egr) acts in the positive feedback circuit to promote signaling, while the BMP binding protein encoded by crossveinless-2 (cv-2) antagonizes signaling. Expression of both genes requires the early activity of the homeobox gene zerknüllt (zen). Two Drosophila species lacking early zen expression have high variability in BMP signaling. These data both detail a new mechanism that generates developmental canalization and identify an example of a species with non-canalized axial patterning.

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Section: Resultssupporting

confidence: 56%

A Genetic Network Conferring Canalization to a Bistable Patterning System in Drosophila

et al. 2013

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“…During ecological speciation, prezygotic isolation may arise when immigrants from foreign, ecologically divergent habitats are selected against [85, 86]. This may occur through natural selection, if immigrants (or hybrids) have reduced viability (extrinsic reproductive isolation; e.g., [5, 6, 87]), or by sexual selection, if maladapted individuals are discriminated against during mate choice (e.g., [88]).…”

Section: Discussionmentioning

confidence: 99%

Divergent Evolution of Male Aggressive Behaviour: Another Reproductive Isolation Barrier in Extremophile Poeciliid Fishes?

Bierbach

Klein

Sassmannshausen

et al. 2012

International Journal of Evolutionary Biology

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Reproductive isolation among locally adapted populations may arise when immigrants from foreign habitats are selected against via natural or (inter-)sexual selection (female mate choice). We asked whether also intrasexual selection through male-male competition could promote reproductive isolation among populations of poeciliid fishes that are locally adapted to extreme environmental conditions [i.e., darkness in caves and/or toxic hydrogen sulphide (H2S)]. We found strongly reduced aggressiveness in extremophile P. oecilia mexicana, and darkness was the best predictor for the evolutionary reduction of aggressiveness, especially when combined with presence of H2S. We demonstrate that reduced aggression directly translates into migrant males being inferior when paired with males from non-sulphidic surface habitats. By contrast, the phylogenetically old sulphur endemic P. sulphuraria from another sulphide spring area showed no overall reduced aggressiveness, possibly indicating evolved mechanisms to better cope with H2S.

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“…These two species form a hybrid zone in São Tomé (Lachaise et al 2000;Llopart et al 2005). Multiple reproductive-barrier mechanisms have been reported for these sibling species, including premating mate discrimination (Coyne et al 2002;Moehring et al 2006), differences in temperature tolerance/preference (Matute et al 2009), conspecific sperm precedence (Chang 2004), hybrid sterility, inviability, and increased development time (Lachaise et al 2000;Coyne et al 2002;Chang 2004;Moehring et al 2006;Matute and Coyne 2010). These two species are very similar in their morphologies (excepting body coloration) and can be distinguished based only on slight differences in male and female genital morphologies (Lachaise et al 2000;Kamimura and Mitsumoto 2012).…”

Section: Introductionmentioning

confidence: 95%

Correlated evolutionary changes in Drosophila female genitalia reduce the possible infection risk caused by male copulatory wounding

Kamimura

2012

Behav Ecol Sociobiol

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Male and female genitalia often show corresponding morphologies indicating coevolutionary processes, but ongoing debate exists as to the driving mechanisms of such coevolution between the sexes. Using interspecific matings between Drosophila santomea and Drosophila yakuba, this study provides evidence that micron-scale differences in male and female genital morphology and resultant mismatches between them during copulation cause wounding and infection risk to females. Male D. yakuba possesses a pair of sclerotized spikes (ventral branches of the basal processes) on the aedeagus, while these projections are much more rounded in D. santomea. D. yakuba females possess a pair of cavities with sclerotized platelets that receive the male genital spikes during copulation, whereas D. santomea females lack these cavities. The pointed genital spikes cause wounding in almost all females of D. santomea mating with male D. yakuba. Furthermore, when fluorescent-labeled microbeads were applied to male genitalia, they invaded the female hemocoel through the copulatory wounds significantly more frequently in heterospecific matings. Although the sclerotized platelets in the genital cavities prevented precise quantification of the extent of wounding in D. yakuba females, a similarly enhanced risk of microbial invasion was detected for the reciprocal heterospecific cross. All beads detected in the female hemocoel were immobilized by hemolymph clotting, indicating an effective immune response. The observed enhanced mating costs due to genital mismatch support the view that corresponding morphologies in female genitalia represent counteradaptations to harmful male behaviors, instead of being evolutionary adaptations to discriminate the species or genetic quality of male mates.

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TEMPERATURE-BASED EXTRINSIC REPRODUCTIVE ISOLATION IN TWO SPECIES OFDROSOPHILA

Abstract: analysis of the interspecific difference in egg hatchability and larval survival showed that these differences are due largely to cytoplasmic effects and to autosomal genes, with sex chromosomes playing little or no role.

Cited by 79 publications

References 53 publications

A Genetic Network Conferring Canalization to a Bistable Patterning System in Drosophila

A Genetic Network Conferring Canalization to a Bistable Patterning System in Drosophila

Divergent Evolution of Male Aggressive Behaviour: Another Reproductive Isolation Barrier in Extremophile Poeciliid Fishes?

Correlated evolutionary changes in Drosophila female genitalia reduce the possible infection risk caused by male copulatory wounding

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