Reproductive Rates and Cycles in the Pocket Gopher

Miller, Milton A.

doi:10.2307/1375341

Cited by 52 publications

(29 citation statements)

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“…In female pocket gophers the pubic symphysis is resorbed at puberty (Hisaw, 1924;Hansen, 1960;Miller, 1946). In the present study females which had pubic gaps were considered adults.…”

Section: Reproductionmentioning

confidence: 93%

“…Hansen and Miller (1959) and Vaughan (1962) have studied plural occupancy of burrows by pocket gophers and found it common during the breeding season. There are additional scattered records of plural occupancy (Horn, 1923;Wight, 1930;English, 1932;Burt, 1933;Scheffer, 1938;Miller, 1946;Russell, 1954;Aldous, 1957). In the present study no special efforts were made to check rates of plural occupancy, although it was recorded regularly for both species, but three records of particular interest were obtained in the spring of 1961.…”

Section: Plural Occupancymentioning

confidence: 99%

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Two Parapatric Species of Pocket Gophers

Vaughan¹

1967

Evolution

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“…In female pocket gophers the pubic symphysis is resorbed at puberty (Hisaw, 1924;Hansen, 1960;Miller, 1946). In the present study females which had pubic gaps were considered adults.…”

Section: Reproductionmentioning

confidence: 93%

Section: Plural Occupancymentioning

confidence: 99%

Two Parapatric Species of Pocket Gophers

Vaughan¹

1967

Evolution

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“…Of these, only nutritional quality has been demonstrated experimentally to produce plastic body-size variation, but nutritional quality is likely to be influenced by the other environmental factors (Patton & Brylski, 1987;Smith & Patton, 1980). Although pocket gopher body size shows some plastic response to environmental variation over a short time scale ( s 10' years), mammalian body size is a feature that influences such life history phenomena as home range size, female fecundity, and population density, all of which potentially feed into the evolutionary dynamics of populations expressed over longer time ,scales (Clutton-Brock & Harvey, 1983;Daly & Patton, 1986;Hansen, 1962;Miller, 1946Miller, , 1952. In this study I investigate the effects of environmental variation caused by climatic change on the northern pocket gopher (ntomomys talpoides) over a long time scale (1 O2 to 1 O3 years) in order to investigate the questions: Does pocket gopher population density remain constant through time at a given locality?…”

Section: Introductionmentioning

confidence: 99%

Evolutionary and ecological response of pocket gophers (Thomomys talpoides) to late-Holocene climatic change

Hadly

1997

Biological Journal of the Linnean Society

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Late-Holocene evolutionary and ecological response of pocket gophers (nomomys hlp&s) and other species to climatic change is documented by mammalian fossils from Lamar Cave, a palaeontological site in northern Yellowstone National Park. Pocket gophers illustrate ecological sensitivity to a series of mesic to xeric climatic excursions in the sagebrush-grassland ecotone during the last 3200 years, increasing in abundance during mesic intervals, and declining in abundance during xeric intervals. Four other small mammal taxa (Microhis sp., Peromyscus maninrlohis, Neotoma cinerca and Spennophilus annutus) also show response to climatic change, increasing or decreasing in abundance in accordance with their preferred habitat requirements. To determine evolutionary response to climate, two craniodental characters for the northern pocket gopher (nomays hlpodes) are investigated in modern representatives within a 4 0 0 h radius of Lamar Cave and then tracked through the time spanned by the fossils. One morphologic character shows that variation in body size, primarily a plastic response to the environment, demonstrates few taxonomically consistent patterns of geographic variation across 39 modern localities. In contrast, the other character indicates genetic relatedness within subspecies. Stasis in the genetically controlled character indicates that the same subspecies of pocket gopher ( E talpodcs hellus) has occupied northern Yellowstone for at least 3200 years. However, E t. tmcllus does show plastic response to climatic change because pocket gophers during the Medieval Warm Period were smaller than at any other time spanned by the deposit. I997 The Linncan Society of London

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“…Those living near grain fields are larger and continue breeding later in the summer than do deer mice in native grassland (Sheppard, manuscript in preparation). Crop irrigation has been shown to increase pregnancy rates in Microtus guentheri (Bodenheimer 1949;cited in Sadleir 1969) and pocket gophers (Thomomys bottae) (Miller 1946).…”

Section: Discussionmentioning

confidence: 99%

Reproduction of Richardson's ground squirrel (Spermophilus richardsonii) in southern Saskatchewan

Dh¹

1972

Can. J. Zool.

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Adult Richardson's ground squirrels (n = 238) were collected near Regina, Saskatchewan in April and May of 1969 and 1970. The adult sex ratio (males: females) of collected animals was 1:3.3 compared with a juvenile sex ratio of 1:1 obtained by live trapping in 1967and 1968. The breeding season extended from 3 to 28 April but 77.8% of all conceptions occurred between 7 and 16 April. All yearlings seemed to be sexually mature and the mean litter size for all females baaed on living embryos was 6.93 ± 0.18. Mortality of embryos was 6.83%. Yearlings were smaller than adults but mean litter sizes of yearlings and adults did not differ. Ground squirrels collected from cropland had a significantly larger mean litter size, were somewhat heavier, and had significantly longer humeri than those from native grassland.

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Reproductive Rates and Cycles in the Pocket Gopher

Cited by 52 publications

References 0 publications

Two Parapatric Species of Pocket Gophers

Two Parapatric Species of Pocket Gophers

Evolutionary and ecological response of pocket gophers (Thomomys talpoides) to late-Holocene climatic change

Reproduction of Richardson's ground squirrel (Spermophilus richardsonii) in southern Saskatchewan

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