Conspecific Sperm Precedence in Two Species of Tropical Sea Urchins

Geyer, Laura; Palumbi, Stephen R.

doi:10.1111/j.0014-3820.2005.tb00897.x

Cited by 62 publications

(64 citation statements)

References 78 publications

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“…We were, however, surprised at the complete hybrid compatibility at the gametic level-especially in a situation of sperm competition with another species. Unlike our results, previous studies have shown a conspecific sire advantage (Bella et al, 1992;Rieseberg et al, 1995;Geyer and Palumbi, 2005). Previous work on amphibian cross-fertilization has also shown wide among-species compatibility at the fertilization level.…”

Section: Trial Number Proportion Offspring Siredcontrasting

confidence: 89%

“…show similar results with poorer motility of heterospecific sperm stored in the spermathecae of females, resulting in lower fertilization success compared with conspecific males (Gregory and Howard, 1994). Work by and shows very similar conspecific dominance in siring success in Tribolium beetles, as do marine organisms (for example, sea urchins Geyer and Palumbi, 2005) and some plants (for example, Rieseberg et al, 1995), although the underlying mechanisms differ (reviewed in Arnold, 1997Arnold, , 2006.…”

Section: Introductionmentioning

confidence: 81%

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Sperm competition and offspring viability at hybridization in Australian tree frogs, Litoria peronii and L. tyleri

2009

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Hybridization between closely related species often leads to reduced viability or fertility of offspring. Complete failure of hybrid offspring (post-zygotic hybrid incompatibilities) may have an important role in maintaining the integrity of reproductive barriers between closely related species. We show elsewhere that in Peron's tree frog, Litoria peronii, males more closely related to a female sire more offspring in sperm competition with a less related rival male. Observations of rare 'phenotypic intermediate' males between L. peronii and the closely related L. tyleri made us suggest that these relatedness effects on siring success may be because of selection arising from risks of costly hybridization between the two species. Here, we test this hypothesis in an extensive sperm competition experiment, which shows that there is no effect of species identity on probability of fertilization in sperm competition trials controlling for sperm concentration and sperm viability. Instead, there was a close agreement between a male's siring success in isolation with a female and his siring success with the same female in competition with a rival male regardless of species identity. Offspring viability and survival, however, were strongly influenced by species identity. Over a 14-day period, hybrid offspring suffered increasing mortality and developed more malformations and an obvious inability to swim and right themselves, leading to compromised probability of survival. Thus, hybridization in these sympatric tree frogs does not compromise fertilization but has a strong impact on offspring viability and opportunity for reinforcement selection on mate choice for conspecific partners.

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Section: Trial Number Proportion Offspring Siredcontrasting

confidence: 89%

Section: Introductionmentioning

confidence: 81%

Sperm competition and offspring viability at hybridization in Australian tree frogs, Litoria peronii and L. tyleri

2009

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“…C. are given sperm from either species in no choice experiments, interspecific fertilization rate is high. However, when sperm from the two species are mixed in equal proportions, eggs are 2.5-4 times more likely to be fertilized by conspecific sperm, showing that conspecific sperm precedence is strong in these sympatric species (Geyer and Palumbi, 2005).…”

Section: Process and Patterns Of Evolution At Gamete Recognition Locimentioning

confidence: 98%

“…But when sperm of the two species are mixed, eggs of E. sp. C are fertilized by conspecific sperm at much higher rates (Geyer and Palumbi, 2005). Such conspecific sperm precedence ( Figure 1) is a common feature of internally fertilizing insects and mammals (Howard, 1999;Howard et al, 2008), but has rarely been tested for explicitly among broadcast spawners.…”

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confidence: 99%

Speciation and the evolution of gamete recognition genes: pattern and process

2008

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Proteins on gamete surfaces are major determinants of fertilization success, particularly in free-spawning animals. Molecular analyses of these simple genetic systems show rapid evolution, positive selection, accelerated coalescence and, sometimes, extensive polymorphism. Careful analysis of the behavior of sperm produced by males with different gamete alleles shows that these alleles can deliver significant functional differences. Three forms of allele-specific fertilization advantage have been shown: assortative mating based on gamete type, rare allele advantage and heterozygote superiority. Models suggest that sperm and egg proteins may be coevolutionary partners that can alternate between directional selection for high fertilization ability and cyclic adaptation of eggs and sperm driven by sexual conflict. These processes act within allopatric populations and may accelerate their divergence if gamete adaptations in separate demes reduce cross-fertilization. Reproductive character displacement by reinforcement may play a diversifying role when previously allopatric populations rejoin. In circumstance that might prove to be common, divergence in sympatry can be driven by sexual conflict or by association of mating types with ecological differences. The ecology of fertilization, especially the degree of sperm competition and egg death via polyspermy, are important determinants of the strength and direction of selection on gametes. Freespawning animals allow careful analysis of gamete recognition -from the behavior of adults and interactions of gametes, to molecular patterns of allele divergence. Future research efforts on the evolutionary consequences of fertilization ecology, and the interaction between extensive variation in egg surface proteins and sperm fertilization ability, are particularly needed.

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“…In both studies, no-choice (single male) fertilization trials (in contrast to our paired-male trials) were performed, which might lead to a different male fertilization success (Geyer and Palumbi, 2005). Furthermore, different results of the role of MHC class II in CFC might reflect different adaptations to the species-specific life cycles and environments: for example, whitefish populations inhibit a lake and have been shown to have a high MHC class II diversity (Binz et al, 2001), while Chinook salmon populations migrate to sea and return to their natal stream to spawn.…”

Section: The Mhc and Fertilization Successmentioning

confidence: 99%

Sexual selection for genetic compatibility: the role of the major histocompatibility complex on cryptic female choice in Chinook salmon (Oncorhynchus tshawytscha)

et al. 2017

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Cryptic female choice (CFC), a form of sexual selection during or post mating, describes processes of differential sperm utilization by females to bias fertilization outcomes towards certain males. In Chinook salmon (Oncorhynchus tshawytscha) the ovarian fluid surrounding the ova of a given female differently enhances the sperm velocity of males. Sperm velocity is a key ejaculate trait that determines fertilization success in externally fertilizing fishes, thus the differential effect on sperm velocity might bias male fertilization outcomes and represent a mechanism of CFC. Once sperm reach the oocyte, CFC could potentially be further facilitated by sperm-egg interactions, which are well understood in externally fertilizing marine invertebrates. Here, we explored the potential genetic basis of both possible mechanisms of CFC by examining whether the genotypic combinations of mates (amino-acid divergence, number of shared alleles) at the major histocompatibility complex (MHC) class I and II explain the variation in sperm velocity and/or male fertilization success that is not explained by sperm velocity, which might indicate MHC-based sperm-egg interactions. We recorded sperm velocity in ovarian fluid, employed paired-male fertilization trials and evaluated the fertilization success of each male using microsatellite-based paternity assignment. We showed that relative sperm velocity was positively correlated with fertilization success, confirming that the differential effect on sperm velocity may be a mechanism of CFC in Chinook salmon. The variation in sperm velocity was independent of MHC class I and II. However, the MHC class II divergence of mates explained fertilization success, indicating that this locus might influence sperm-egg interactions.

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Conspecific Sperm Precedence in Two Species of Tropical Sea Urchins

Cited by 62 publications

References 78 publications

Sperm competition and offspring viability at hybridization in Australian tree frogs, Litoria peronii and L. tyleri

Sperm competition and offspring viability at hybridization in Australian tree frogs, Litoria peronii and L. tyleri

Speciation and the evolution of gamete recognition genes: pattern and process

Sexual selection for genetic compatibility: the role of the major histocompatibility complex on cryptic female choice in Chinook salmon (Oncorhynchus tshawytscha)

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