Effects of hormones and gonadal status on the midventral gland of the grasshopper mouse <i>Onychomys leucogaster</i>

Pinter, Aelita J.

doi:10.1002/ar.1092110313

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…First, baculum morphology varies greatly among species (Burt, 1960;Schultz et al, 2016) and may cause mechanical isolation (Patterson & Thaeler, 1982 (Dulac & Torello, 2003). Although the functional diversity of VRs in Onychomys is unknown, sexually dimorphic midventral sebaceous glands that secrete pheromones (Pinter, 1985) likely play a key role in sexual and, potentially, species identification. Third, ultrasonic vocalizations (USVs) produced during male-female interactions are important in coordinating reproduction in muroid rodents (Egnor & Seagraves, 2016).…”

Section: Discussionmentioning

confidence: 99%

Vocal divergence is concordant with genomic evidence for strong reproductive isolation in grasshopper mice (Onychomys)

Campbell

Arévalo

Martin

et al. 2019

Ecology and Evolution

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Behavioral barriers to gene flow often evolve faster than intrinsic incompatibilities and can eliminate the opportunity for hybridization between interfertile species. While acoustic signal divergence is a common driver of premating isolation in birds and insects, its contribution to speciation in mammals is less studied. Here we characterize the incidence of, and potential barriers to, hybridization among three closely related species of grasshopper mice (genus Onychomys). All three species use long‐distance acoustic signals to attract and localize mates; Onychomys arenicola and Onychomys torridus are acoustically similar and morphologically cryptic whereas Onychomys leucogaster is larger and acoustically distinct. We used genotyping‐by‐sequencing (GBS) to test for evidence of introgression in 227 mice from allopatric and sympatric localities in the western United States and northern Mexico. We conducted laboratory mating trials for all species pairs to assess reproductive compatibility, and recorded vocalizations from O. arenicola and O. torridus in sympatry and allopatry to test for evidence of acoustic character displacement. Hybridization was rare in nature and, contrary to prior evidence for O. torridus/O. arenicola hybrids, only involved O. leucogaster and O. arenicola. In contrast, laboratory crosses between O. torridus and O. arenicola produced litters whereas O. leucogaster and O. arenicola crosses did not. Call fundamental frequency in O. torridus and O. arenicola was indistinguishable in allopatry but significantly differentiated in sympatry, a pattern consistent with reproductive character displacement. These results suggest that assortative mating based on a long‐distance signal is an important isolating mechanism between O. torridus and O. arenicola and highlight the importance of behavioral barriers in determining the permeability of species boundaries.

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Section: Discussionmentioning

confidence: 99%

Vocal divergence is concordant with genomic evidence for strong reproductive isolation in grasshopper mice (Onychomys)

Campbell

Arévalo

Martin

et al. 2019

Ecology and Evolution

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“…Changes in female scent and scent marking behaviours are related to fluctuations in ovarian hormones across the female reproductive cycle (Takahashi 1990 ). Ovariectomy reduces or eliminates scent marking (golden hamster: Albers and Rowland 1989 ; domestic rabbit: Hudson and Vodermayer 1992 ; mouse: Kimura and Hagiwara 1985 ; Mongolian gerbil: Wallace et al 1973 ), causes scent glands to regress (grasshopper mouse: Pinter 1985 ; Mongolian gerbil: Wallace et al 1973 ) and reduces male attraction to female odours (meadow vole: Ferkin et al 1991 ; domestic dog: Lisberg and Snowdon 2009 ). However, scent marking and glandular morphology can be restored through hormonal injections of estradiol (golden hamster: Albers and Rowland 1989 ; gray short-tailed opossum: Fadem 1990 ; mouse: Kimura and Hagiwara 1985 ) or estradiol and progesterone (rat: Birke 1984 ; Mongolian gerbil: Owen and Thiessen 1974 ).…”

Section: Sexual Attractionmentioning

confidence: 99%

Female Chemical Signalling Underlying Reproduction in Mammals

2018

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Chemical communication plays many key roles in mammalian reproduction, although attention has focused particularly on male scent signalling. Here, we review evidence that female chemical signals also play important roles in sexual attraction, in mediating reproductive competition and cooperation between females, and in maternal care, all central to female reproductive success. Female odours function not only to advertise sexual receptivity and location, they can also have important physiological priming effects on male development and sperm production. However, the extent to which female scents are used to assess the quality of females as potential mates has received little attention. Female investment in scent signalling is strongly influenced by the social structure and breeding system of the species. Although investment is typically male-biased, high competition between females can lead to a reversed pattern of female- biased investment. As among males, scent marking and counter-marking are often used to advertise territory defence and high social rank. Female odours have been implicated in the reproductive suppression of young or subordinate females across a range of social systems, with females of lower competitive ability potentially benefiting by delaying reproduction until conditions are more favourable. Further, the ability to recognise individuals, group members and kin through scent underpins group cohesion and cooperation in many social species, as well as playing an important role in mother-offspring recognition. However, despite the diversity of female scent signals, chemical communication in female mammals remains relatively understudied and poorly understood. We highlight several key areas of future research that are worthy of further investigation.

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“…The secretions of the midventral gland are probably used for communications such as territorial marking, advertising of gonadal status, or pup identification (Pinter, 1985). The secretions of the midventral gland are probably used for communications such as territorial marking, advertising of gonadal status, or pup identification (Pinter, 1985).…”

Section: B Biologymentioning

confidence: 99%