Familiarity and flexible mating strategies of a solitary rodent, Dipodomys ingens

Randall, Jan A.; Hekkala, Evon R.; Cooper, Loni D.; Barfield, Julia

doi:10.1006/anbe.2002.3029

Cited by 36 publications

(19 citation statements)

References 52 publications

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“…Giant kangaroo rats are probably polygynous although we do not know to what extent, and they apparently show a limited sex-bias in natal dispersal, which is typical for kangaroo rats (Jones 1988(Jones , 1989Jones et al 1988;Waser and Elliott 1991;Price et al 1994;Williams et al 1999;Cooper and Randall 2001;Metcalf et al 2001;Randall et al 2002). The fact that we obtained no significant negative F IS values for any population is consistent with a low degree of polygyny and insignificant sex bias in natal dispersal.…”

Section: Inference About Social Structuresupporting

confidence: 87%

Population structure and genetic variation in the endangered Giant Kangaroo Rat (Dipodomys ingens)

et al. 2005

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Populations of the endangered giant kangaroo rat, Dipodomys ingens (Heteromyidae), have suffered increasing fragmentation and isolation over the recent past, and the distribution of this unique rodent has become restricted to 3% of its historical range. Such changes in population structure can significantly affect effective population size and dispersal, and ultimately increase the risk of extinction for endangered species.To assess the fine-scale population structure, gene flow, and genetic diversity of remnant populations of Dipodomys ingens, we examined variation at six microsatellite DNA loci in 95 animals from six populations. Genetic subdivision was significant for both the northern and southern part of the kangaroo rat's range although there was considerable gene flow among southern populations. While regional gene diversity was relatively high for this endangered species, hierarchical F-statistics of northern populations in Fresno and San Benito counties suggested non-random mating and genetic drift within subpopulations. We conclude that effective dispersal, and therefore genetic distances between populations, is better predicted by ecological conditions and topography of the environment than linear geographic distance between populations. Our results are consistent with and complimentary to previous findings based on mtDNA variation of giant kangaroo rats. We suggest that management plans for this endangered rodent focus on protection of suitable habitat, maintenance of connectivity, and enhancement of effective dispersal between populations either through suitable dispersal corridors or translocations.

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Section: Inference About Social Structuresupporting

confidence: 87%

Population structure and genetic variation in the endangered Giant Kangaroo Rat (Dipodomys ingens)

et al. 2005

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“…This is in contrast to expectations from other empirical studies with other species (Evans and Magurran, 1999;Jirotkul, 1999;Kodric-Brown, 1988;Mills and Reynolds, 2003;Randall et al, 2002) and thus in apparent opposition with the classical predictions that OSR plays a primary role in shaping behavioral patterns (Emlen and Oring, 1977;Ahnesjö , 1996, 2002). In the Alpine newt, courting males exhibited the same behavioral patterns in unbiased OSR as under a perceived excess of males.…”

Section: Discussioncontrasting

confidence: 85%

“…In male-biased OSR, males often compete more intensively for mates than females (CluttonBrock and Parker, 1992;Clutton-Brock and Vincent, 1991;Thomas and Manica, 2005) and exhibit alternative mating tactics (Evans and Magurran, 1999;Kodric-Brown, 1988;Mills and Reynolds, 2003;Randall et al, 2002;Shine et al, 2003). The opposite pattern also occurs in species with female-biased OSR (Almada et al, 1995;Berglund, 1994;CluttonBrock and Parker, 1992;Clutton-Brock and Vincent, 1991;Jones et al, 2001).…”

mentioning

confidence: 99%

Courtship Behavior in the Alpine Newt Triturus Alpestris at Two Different Densities of Males

Denoël¹,

Hector²,

Poncin³

2005

Herpetologica

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The aim of this laboratory experiment was to examine courtship behavior and reproductive success under two different perceived male densities in the Alpine newt (Triturus alpestris). Male behavioral patterns were similar at unbiased and male-biased operational sex ratios (OSR). Although the exhibition of luring behaviors is risky in the presence of other males, no difference in the frequencies of displays was found at the two male densities. Similarly, the responsiveness of females towards males and the success rate of the encounters (i.e., spermatophore transfer) were not explained by the OSR. Our results show that courting Alpine newts do not change their courtship patterns when other males are present and do not interact directly. However they are not necessarily opposed to those of previous experiments showing sexual interference and female aversion in male-biased OSR with possibility of interactions. These observations suggest that the evolution of courtship behavior may not be driven by the risk of sexual interference with other males prior to potential physical contact and that the benefits of breeding regardless of OSR can overcome the risk of competition at male-biased OSR.

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“…The frequency of contacts between conspecifics depends on the species. Larger species such as D. spectabilis, D. deserti (Schroder, 1979), and D. ingens (Randall et al, 2002) are highly territorial, with little overlapping of their home ranges. However, smaller species such as D. merriami and D. ordii exhibit frequent overlap of home ranges (Randall, 1989(Randall, , 1991.…”

Section: Introductionmentioning

confidence: 99%

Spatial relationships between burrows of an insular population of Dipodomys merriami

Vázquez¹,

Álvarez-Castañeda²

2011

Mammalian Biology

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a b s t r a c tFor semi-fossorial rodents, descriptions of the distribution and use of burrows can advance in understanding the spatial and social organization of their population. This study describes the use and spatial relationships between burrows of the kangaroo rat (Dipodomys merriami insularis), a subspecies that is possibly on the verge of extinction. Individuals were captured and recaptured in an area of 79.8 hectares located at San José Island, Gulf of California, Mexico, during both the breeding (BRED, from March to May) and the non-breeding (NON-BRED, from October to November) seasons of 2008. Our results show that females and males use a median of 1-2 burrows; factors such as age class, season and frequency of captures account for the number of burrows used by individuals. Few individuals shared their burrows (9.2% during BRED and 1.1% during NON-BRED). The burrows showed a clumped spatial distribution in both sampling periods. The spatial relationship between burrows is characterized by the fact that animals of opposite sex are closer to each other than same-sex individuals, and this spatial relationship between nearest-neighbor burrows is influenced by age class. Our results show that D. m. insularis displays burrow use and spatial organization patterns similar to those observed in other populations of D. merriami.

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Familiarity and flexible mating strategies of a solitary rodent, Dipodomys ingens

Cited by 36 publications

References 52 publications

Population structure and genetic variation in the endangered Giant Kangaroo Rat (Dipodomys ingens)

Population structure and genetic variation in the endangered Giant Kangaroo Rat (Dipodomys ingens)

Courtship Behavior in the Alpine Newt Triturus Alpestris at Two Different Densities of Males

Spatial relationships between burrows of an insular population of Dipodomys merriami

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