Desynchronising male and female reproductive seasonality: dynamics of male MHC-independent olfactory attractiveness in sticklebacks

Sommerfeld, Ralf D.; Boehm, Thomas; Milinski, Manfred

doi:10.1080/08927014.2008.9522515

Cited by 9 publications

(20 citation statements)

References 54 publications

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“…As a male's nest is a reservoir of both MHC derived odor and a 'male signaling factor' that validates the MHC signal (Milinski et al 2005(Milinski et al , 2010Sommerfeld et al 2008), we took the stimulus water directly from above the nest and only from males that maintained (glued) their nest on the day of the test (see Milinski et al 2005). On one side of the flow channel, stimulus water originated from a male from the same habitat as the test female, and on the other side from a male originating from the foreign habitat (sympatric male vs. allopatric male).…”

Section: Olfactory-based Mate Choicementioning

confidence: 99%

Parasite diversity, patterns of MHC II variation and olfactory based mate choice in diverging three-spined stickleback ecotypes

et al. 2010

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Ecological speciation has been the subject of intense research in evolutionary biology but the genetic basis of the actual mechanism driving reproductive isolation has rarely been identified. The extreme polymorphism of the major histocompatibility complex (MHC), probably maintained by parasite-mediated selection, has been proposed as a potential driver of population divergence. We performed an integrative field and experimental study using three-spined stickleback river and lake ecotypes. We characterized their parasite load and variation at MHC class II loci. Fish from lakes and rivers harbor contrasting parasite communities and populations possess different MHC allele pools that could be the result of a combined action of genetic drift and parasite-mediated selection. We show that individual MHC class II diversity varies among populations and is lower in river ecotypes. Our results suggest the action of homogenizing selection within habitat type and diverging selection between habitat types. Finally, reproductive isolation was suggested by experimental evidence: in a flow channel design females preferred assortatively the odor of their sympatric male. This demonstrates the role of olfactory cues in maintaining reproductive isolation between diverging fish ecotypes

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Section: Olfactory-based Mate Choicementioning

confidence: 99%

Parasite diversity, patterns of MHC II variation and olfactory based mate choice in diverging three-spined stickleback ecotypes

et al. 2010

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“…Sixteen weeks after exposure, the G1 males (exposed and unexposed) were separated in single 16‐L aquaria with nesting material, whereas the G1 females were maintained in group aquaria (Sommerfeld et al . ). All individuals were fed ad libitum with frozen and live chironomid larvae.…”

Section: Methodsmentioning

confidence: 97%

Experimental parasite infection reveals costs and benefits of paternal effects

et al. 2014

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Forces shaping an individual's phenotype are complex and include transgenerational effects. Despite low investment into reproduction, a father's environment and phenotype can shape its offspring's phenotype. Whether and when such paternal effects are adaptive, however, remains elusive. Using three-spined sticklebacks in controlled infection experiments, we show that sperm deficiencies in exposed males compared to their unexposed brothers functionally translated into reduced reproductive success in sperm competition trials. In non-competitive fertilisations, offspring of exposed males suffered significant costs of reduced hatching success and survival but they reached a higher body condition than their counterparts from unexposed fathers after experimental infection. Interestingly, those benefits of paternal infection did not result from increased resistance but from increased tolerance to the parasite. Altogether, these results demonstrate that parasite resistance and tolerance are shaped by processes involving both genetic and non-genetic inheritance and suggest a context-dependent adaptive value of paternal effects.

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“…After 20 weeks under standardized winter-like conditions (8 h day : 16 h night; 68C) and six weeks in spring-like conditions (12 h : 12 h; 128C), fish were isolated singly into 16 l tanks under summer conditions (16 h : 8 h; 188C). There, to build a nest, males were provided with artificial nesting material [14].…”

Section: Materials and Methods (A) Study Systemmentioning

confidence: 99%

“…All males were presented with a ripe female within 24 h prior to dissection and showed active reproductive behaviour, for example, nest gluing [14]. Fish were sacrificed by an incision in the brainstem prior to dissection.…”

Section: (C) Sperm Measurements and Competition Trialsmentioning

confidence: 99%

The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks

et al. 2015

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Ecology can play a major role in species diversification. As individuals are adapting to contrasting habitats, reproductive barriers may evolve at multiple levels. While pre-mating barriers have been extensively studied, the evolution of post-mating reproductive isolation during early stages of ecological speciation remains poorly understood. In diverging three-spined stickleback ecotypes from two lakes and two rivers, we observed differences in sperm traits between lake and river males. Interestingly, these differences did not translate into ecotype-specific gamete precedence for sympatric males in competitive in vitro fertilization experiments, potentially owing to antagonistic compensatory effects. However, we observed indirect evidence for impeded development of inter-ecotype zygotes, possibly suggesting an early stage of genetic incompatibility between ecotypes. Our results show that pre-zygotic post-copulatory mechanisms play a minor role during this first stage of ecotype divergence, but suggest that genetic incompatibilities may arise at early stages of ecological speciation.

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Desynchronising male and female reproductive seasonality: dynamics of male MHC-independent olfactory attractiveness in sticklebacks

Cited by 9 publications

References 54 publications

Parasite diversity, patterns of MHC II variation and olfactory based mate choice in diverging three-spined stickleback ecotypes

Parasite diversity, patterns of MHC II variation and olfactory based mate choice in diverging three-spined stickleback ecotypes

Experimental parasite infection reveals costs and benefits of paternal effects

The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks

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