Systematics and biology of the woodland jumping mouse, Napaeozapus insignis

Wrigley, Robert E.

doi:10.5962/bhl.title.50103

Cited by 12 publications

(16 citation statements)

References 17 publications

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“…The pairing and separation dates from 39 successful breeding attempts showed that the most common possible gestation length was 18 days (Figs 2B and S2A), which falls within the previously reported range [19]. To avoid reducing the probability of breeding success, we did not investigate the presence or absence of a copulatory plug in this species by handling the paired females; however, we do not expect that the male produces a copulatory plug, as the male lacks some accessory glands [47] and evidence of mixed-paternity litters has been found in the closely-related Pacific jumping mouse, Zapus trinotatus [48]. Direct observation of copulation, or the identification of a copulatory plug that can be used to determine the time of mating, will be necessary to make a more direct determination of gestation length.…”

Section: Housing and Breedingsupporting

confidence: 51%

Breeding and hibernation of captive meadow jumping mice (Zapus hudsonius)

2021

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Hibernating mammals exhibit unique metabolic and physiological phenotypes that have potential applications in medicine or spaceflight, yet our understanding of the genetic basis and molecular mechanisms of hibernation is limited. The meadow jumping mouse, a small North American hibernator, exhibits traits–including a short generation time–that would facilitate genetic approaches to hibernation research. Here we report the collection, captive breeding, and laboratory hibernation of meadow jumping mice. Captive breeders in our colony produced a statistically significant excess of male offspring and a large number of all-male and all-female litters. We confirmed that short photoperiod induced pre-hibernation fattening, and cold ambient temperature facilitated entry into hibernation. During pre-hibernation fattening, food consumption exhibited non-linear dependence on both body mass and temperature, such that food consumption was greatest in the heaviest animals at the coldest temperatures. Meadow jumping mice exhibited a strong circadian rhythm of nightly activity that was disrupted during the hibernation interval. We conclude that it is possible to study hibernation phenotypes using captive-bred meadow jumping mice in a laboratory setting.

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Section: Housing and Breedingsupporting

confidence: 51%

Breeding and hibernation of captive meadow jumping mice (Zapus hudsonius)

2021

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“…The pairing and separation dates from 39 successful breeding attempts showed that the most common possible gestation length was 18 days (Figs 3B and S1A), which falls within the previously reported range [19]. To avoid reducing the probability of breeding success, we did not investigate the presence or absence of a copulatory plug in this species by handling the paired females; however, we do not expect that the male produces a copulatory plug, as the male lacks some accessory glands [44] and evidence of mixed-paternity litters has been found in the closelyrelated Pacific jumping mouse, Zapus trinotatus [45]. Direct observation of copulation, or the identification of a copulatory plug that can be used to determine the time of mating, will be necessary to make a more direct determination of gestation length.…”

Section: Housing and Breedingsupporting

confidence: 51%

Breeding and hibernation of captive meadow jumping mice (Zapus hudsonius)

Brem

McNulty

Israelsen

2020

Preprint

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Hibernating mammals exhibit unique metabolic and physiological phenotypes that have potential applications in medicine or spaceflight, yet our understanding of the genetic basis and molecular mechanisms of hibernation is limited. The meadow jumping mouse, a small North American hibernator, exhibits traits – including a short generation time – that would facilitate genetic approaches to hibernation research. Here we report the collection, captive breeding, and laboratory hibernation of meadow jumping mice. Captive breeders in our colony produced a statistically significant excess of male offspring and a large number of all-male and all-female litters. We confirmed that short photoperiod induced pre-hibernation fattening, and cold ambient temperature facilitated entry into hibernation. During pre-hibernation fattening, food consumption exhibited non-linear dependence on both body mass and temperature, such that food consumption was greatest in the heaviest animals at the coldest temperatures. Meadow jumping mice exhibited a strong circadian rhythm of nightly activity that was disrupted during the hibernation interval. We quantified the length and timing of torpor bouts and arousals obtained from an uninterrupted recording of a hibernating female. Over a 90.6 day hibernation interval, torpor bouts ranged from 2.1 to 12.8 days (mean 7.7 days), and arousal length was relatively constant with a mean length of 9.6 hours. We conclude that it is possible to study hibernation phenotypes using captive-bred meadow jumping mice in a laboratory setting.

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“…Thirty-seven Zapus studied exhibit extra cusplets similar to those described by Wrigley (1972) Left Ml internal-PSMNH 7748 Oregon, Linn Co., Fish Lake. Left m2 Labial-PSMNH 12956 Oregon, Linn Co., 1.5 mi N Big Lake.…”

supporting

confidence: 59%

“…In the case of the three Zapus known to be lacking premolars this can be considered a reasonable hypothesis. However, the Napaeozapus reported to have a premolar (Wrigley, 1972) doesn't fit with this reasoning, but would lend support to our theory of gene retention. Hall (1940) also suggested that missing or extra teeth occur "most often at the places in the tooth row where differences occur between Brought to you by | The University of Auckland Library Authenticated Download Date | 6/1/15 3:32 AM genera of the same family...".…”

Section: Discussionmentioning

confidence: 73%

“…Brabent (1971) reported a few cases of lingual tubercles on human incisors but did not hypothesize about the genetics. Wrigley (1972) did not attempt an explanation about their presence in Napaeozapus and neither shall we in Zapus other than to say that the frequency with which they apparently occur suggests a certain amount of plasticity in the fine points of the occlusal pattern of zapodid teeth. This may be normal variation within the genus which can be selected for or against and which may have led to the observed variation between the various species of zapodids (Jones, in prep.).…”

Section: Discussionmentioning

confidence: 97%

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