The role of mating preferences in shaping interspecific divergence in mating signals in vertebrates

Ptacek, Margaret B.

doi:10.1016/s0376-6357(00)00123-6

Cited by 124 publications

(96 citation statements)

References 233 publications

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“…It is curious that male sea lamprey, an ectothermic animal, develop a thermogenic secondary sexual character at the final stage of their life span. Many male vertebrates invest a large amount of energy in sexual advertisement, especially in various forms of exaggerated secondary sexual characters (Clutton-Brock, 2007;Ptacek, 2000). As in other male sexual characters, androgen treatment increases the rope size in adult male sea lamprey (Bryan et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

A thermogenic secondary sexual character in male sea lamprey

Chung-Davidson

Priess

Yeh

et al. 2013

Journal of Experimental Biology

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SUMMARYSecondary sexual characters in animals are exaggerated ornaments or weapons for intrasexual competition. Unexpectedly, we found that a male secondary sexual character in sea lamprey (Petromyzon marinus) is a thermogenic adipose tissue that instantly increases its heat production during sexual encounters. This secondary sexual character, developed in front of the anterior dorsal fin of mature males, is a swollen dorsal ridge known as the 'rope' tissue. It contains nerve bundles, multivacuolar adipocytes and interstitial cells packed with small lipid droplets and mitochondria with dense and highly organized cristae. The fatty acid composition of the rope tissue is rich in unsaturated fatty acids. The cytochrome c oxidase activity is high but the ATP concentration is very low in the mitochondria of the rope tissue compared with those of the gill and muscle tissues. The rope tissue temperature immediately rose up to 0.3°C when the male encountered a conspecific. Mature males generated more heat in the rope and muscle tissues when presented with a mature female than when presented with a male (paired t-test, P<0.05). On average, the rope generated 0.027±0.013Wcm-3 more heat than the muscle in 10min. Transcriptome analyses revealed that genes involved in fat cell differentiation are upregulated whereas those involved in oxidative-phosphorylation-coupled ATP synthesis are downregulated in the rope tissue compared with the gill and muscle tissues. Sexually mature male sea lamprey possess the only known thermogenic secondary sexual character that shows differential heat generation toward individual conspecifics. Supplementary material available online at

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Section: Discussionmentioning

confidence: 99%

A thermogenic secondary sexual character in male sea lamprey

Chung-Davidson

Priess

Yeh

et al. 2013

Journal of Experimental Biology

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“…Studies of mating behavior and sexual selection have traditionally focused on organisms with complex premating behaviors such as color recognition (Seehausen et al 1998), sexual selection on size (Fleming 1996), mating calls (Brown 1999;Ptacek 2000), and female choice of extreme male traits (Andersson and Iwasa 1996). Mate choice experiments have long been the standard tool for understanding mating behavior in organisms with a strong ethological component to reproductive isolation.…”

Section: Discussionmentioning

confidence: 99%

Conspecific Sperm Precedence in Two Species of Tropical Sea Urchins

Geyer

Palumbi

2005

Evolution

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Abstract. Conspecific sperm precedence occurs when females are exposed to sperm from males of multiple species, but preferentially use sperm of a conspecific. Conspecific sperm precedence and its mechanisms have been documented widely in terrestrial species, in which complex female behaviors or reproductive tract morphologies can allow many opportunities for female choice and sperm competition, however, the opportunity for conspecific sperm precedence in free spawning marine invertebrates has been largely ignored. Two sea urchin species, Echinometra oblonga and E. sp. C, have high levels of interspecific fertilization in no-choice lab crosses, but no natural hybrids have been found. We performed competitive fertilization assays to test for conspecific sperm precedence and found that eggs of both species showed a marked preference for conspecific sperm when fertilized with heterospecific sperm mixtures. Strong rejection of heterospecific sperm would not have been predicted from no-choice assays and helps explain the lack of natural hybrids. We also found significant variation in hybridization success among crosses. Conspecific sperm precedence in free spawning invertebrates shows that the simple surfaces of eggs and sperm provide ample opportunity for egg choice and sperm competition even in the absence of intricate behavior or complex reproductive morphologies.

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“…In addition, females that have broods from multiple sires have higher fecundity than average for their body size (34). Therefore, the general increase in sperm production for conspecific females over heterospecific females may ref lect a continuation of the mate-quality preferences of these male sailfin mollies, providing evidence that the same traits that are selected by sexual selection can affect interactions between closely related species, and potentially lead to reproductive isolation (2,4,5).…”

Section: Discussionmentioning

confidence: 99%

“…Prezygotic reproductive isolation and its importance in speciation is traditionally approached from the viewpoint of those events that occur before mating, such as assortative mating, or mate choice. Empirical evidence suggests that traits that are used in mate choice within a species may also be involved in maintaining sexual isolation between closely related species (2)(3)(4)(5). Recently, the emphasis in studies of reproductive isolation has shifted to acknowledge the importance of events that affect fertilization success or failure that occur after copulation, but before zygote formation (6).…”

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confidence: 99%

Discriminating males alter sperm production between species

Aspbury

Gabor

2004

Proc. Natl. Acad. Sci. U.S.A.

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Prezygotic reproductive isolation and its importance in speciation is traditionally approached from the viewpoint of those events that occur before mating. However, recent interest in sperm competition theory has shown that prezygotic isolation can be affected by mechanisms that occur after mating but before fertilization. One neglected aspect of these studies is how the cost of sperm production might play a role in species isolation. We examined differential sperm production in a species whose males are sexually parasitized by a unisexual gynogenetic species. Gynogens are clonal females that require sperm from males of closely related bisexual species to initiate embryogenesis. We tested for differential sperm production by male sailfin mollies (Poecilia latipinna) when they were in the presence of either a heterospecific, gynogenetic female (Poecilia formosa, Amazon molly) or a conspecific female. We found that previously demonstrated male mate choice for conspecific over heterospecific females also is revealed in sperm production. Males from both an allopatric and a sympatric population produce more sperm when in the presence of a conspecific female than when in the presence of a heterospecific female. We suggest that differential sperm production also could play a role in prezygotic reproductive isolation in bisexual species complexes that occur in sympatry.Poecilia ͉ prezygotic reproductive isolation ͉ sperm competition ͉ unisexual-bisexual species complex

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The role of mating preferences in shaping interspecific divergence in mating signals in vertebrates

Cited by 124 publications

References 233 publications

A thermogenic secondary sexual character in male sea lamprey

A thermogenic secondary sexual character in male sea lamprey

Conspecific Sperm Precedence in Two Species of Tropical Sea Urchins

Discriminating males alter sperm production between species

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