Age determination in yellow-pine chipmunks (<i>Tamias amoenus</i>): a comparison of eye lens masses and bone sections

Barker, Jennifer M.; Boonstra, Rudy; Schulte‐Hostedde, Albrecht I.

doi:10.1139/z03-173

Cited by 15 publications

(15 citation statements)

References 26 publications

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“…We measured lens weight and total bone lines for each individual animal (Figure 2) as suggested by Barker et al (2003) and Epp et al (2009). The data were recalculated as a percentage of the mean of the respective measurements within species and summarized in an averaged numerical rank.…”

Section: Resultsmentioning

confidence: 99%

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Habitat-specific shaping of proliferation and neuronal differentiation in adult hippocampal neurogenesis of wild rodents

Cavegn¹,

Dijk²,

Menges³

et al. 2013

Front. Neurosci.

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Daily life of wild mammals is characterized by a multitude of attractive and aversive stimuli. The hippocampus processes complex polymodal information associated with such stimuli and mediates adequate behavioral responses. How newly generated hippocampal neurons in wild animals contribute to hippocampal function is still a subject of debate. Here, we test the relationship between adult hippocampal neurogenesis (AHN) and habitat types. To this end, we compare wild Muridae species of southern Africa [Namaqua rock mouse (Micaelamys namaquensis), red veld rat (Aethomys chrysophilus), highveld gerbil (Tatera brantsii), and spiny mouse (Acomys spinosissimus)] with data from wild European Muridae [long-tailed wood mice (Apodemus sylvaticus), pygmy field mice (Apodemus microps), yellow-necked wood mice (Apodemus flavicollis), and house mice (Mus musculus domesticus)] from previous studies. The pattern of neurogenesis, expressed in normalized numbers of Ki67- and Doublecortin(DCX)-positive cells to total granule cells (GCs), is similar for the species from a southern African habitat. However, we found low proliferation, but high neuronal differentiation in rodents from the southern African habitat compared to rodents from the European environment. Within the African rodents, we observe additional regulatory and morphological traits in the hippocampus. Namaqua rock mice with previous pregnancies showed lower AHN compared to males and nulliparous females. The phylogenetically closely related species (Namaqua rock mouse and red veld rat) show a CA4, which is not usually observed in murine rodents. The specific features of the southern environment that may be associated with the high number of young neurons in African rodents still remain to be elucidated. This study provides the first evidence that a habitat can shape adult neurogenesis in rodents across phylogenetic groups.

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Section: Resultsmentioning

confidence: 99%

“…The eye lenses were dried for 5 days at 80°C and weighted (Barker et al, 2003). Femurs were washed and immersed in a rapid decalcifying solution (Baker, Histo Grade) for 24 h. Using a digital calliper, a 3 mm segment was taken from the mid-diaphysis of the femur and infiltrated with HEM as described above.…”

Section: Methodsmentioning

confidence: 99%

Habitat-specific shaping of proliferation and neuronal differentiation in adult hippocampal neurogenesis of wild rodents

Cavegn¹,

Dijk²,

Menges³

et al. 2013

Front. Neurosci.

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“…Epp et al (2009) have used eye lens weights, assessed in both wild rats and laboratory conspecifics of known age, for age estimation. Barker et al (2003) and Cavegn et al (2013) combined lens weight with age-dependent structural changes in the number of adhesion lines in the circumferential lamellae of the femur. Even if it may not be possible to arrive at an exact absolute age that would allow direct comparison with laboratory-raised animals, it is at least possible to age wild animals relative to each other in a rather precise manner.…”

Section: Comparing the Age-dependent Regulation Of Hippocampal Neurogmentioning

confidence: 99%

Adult Hippocampal Neurogenesis in Natural Populations of Mammals

Amrein

2015

Cold Spring Harb Perspect Biol

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This review will discuss adult hippocampal neurogenesis in wild mammals of different taxa and outline similarities with and differences from laboratory animals. It begins with a review of evidence for hippocampal neurogenesis in various mammals, and shows the similar patterns of age-dependent decline in cell proliferation in wild and domesticated mammals. In contrast, the pool of immature neurons that originate from proliferative activity varies between species, implying a selective advantage for mammals that can make use of a large number of these functionally special neurons. Furthermore, rapid adaptation of hippocampal neurogenesis to experimental challenges appears to be a characteristic of laboratory rodents. Wild mammals show species-specific, rather stable hippocampal neurogenesis, which appears related to demands that characterize the niche exploited by a species rather than to acute events in the life of its members. Studies that investigate adult neurogenesis in wild mammals are not numerous, but the findings of neurogenesis under natural conditions can provide new insights, and thereby also address the question to which cognitive demands neurogenesis may respond during selection.

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“…Relative age was determined using the number of adhesion lines in the inner and outer circumferential lamellae of the femur (Barker et al, 2003). Femurs were washed and immersed in a solution for rapid decalcification (Baker, Histograde) for 24h.…”

Section: Relative Age Determinationmentioning

confidence: 99%

Trading new neurons for status: Adult hippocampal neurogenesis in eusocial Damaraland mole-rats

Oosthuizen

Amrein

2016

Neuroscience

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Highlights• The hippocampal architecture of the Damaraland mole-rat corresponds largely to that of other mole-rat species.• No gender differences are found in hippocampal neurogenesis of Damaraland mole-rats.• Neurogenesis is unrelated to relative age in Damaraland mole-rats.• There is an inverse relationship between social status and neurogenesis in Damaraland mole-rats. 1 AbstractDiversity in social structures, from solitary to eusocial, is a prominent feature of subterranean African mole-rat species. Damaraland mole-rats are eusocial, they live in colonies that are characterized by a reproductive division of labour and a subdivision into castes based on physiology and behaviour. Damaraland mole-rats are exceptionally long lived and reproductive animals show delayed aging compared to non-reproductive animals. In the present study, we described the hippocampal architecture and the rate of hippocampal neurogenesis of wild derived, adult Damaraland mole-rats in relation to sex, relative age and social status or caste. Overall, Damaraland mole-rats were found to have a small hippocampus and low rates of neurogenesis. We found no correlation between neurogenesis and sex or relative age. Social status or caste were the most prominent modulator of neurogenesis. An inverse relationship between neurogenesis and social status was apparent, with queens displaying the lowest neurogenesis while the worker mole-rats had the most. As there is no natural progression from one caste to another, social status within a colony was relatively stable and is reflected in the level of neurogenesis. Our results correspond to those found in the naked mole-rat, and may reflect an evolutionary and environmentally conserved trait within social mole-rat species.

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Age determination in yellow-pine chipmunks (Tamias amoenus): a comparison of eye lens masses and bone sections

Cited by 15 publications

References 26 publications

Habitat-specific shaping of proliferation and neuronal differentiation in adult hippocampal neurogenesis of wild rodents

Habitat-specific shaping of proliferation and neuronal differentiation in adult hippocampal neurogenesis of wild rodents

Adult Hippocampal Neurogenesis in Natural Populations of Mammals

Trading new neurons for status: Adult hippocampal neurogenesis in eusocial Damaraland mole-rats

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