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Ecological Research

, Volume 33, Issue 5, pp 979–988 | Cite as

Elevation induced variation in the breeding traits of a nectar-feeding non-flying mammal

  • Ross L. Goldingay
  • Niels Rueegger
Original Article
  • 58 Downloads

Abstract

Factors that influence reproduction in nectar-feeding non-flying mammals are poorly described. We investigated factors that may influence the breeding traits of the eastern pygmy-possum (Cercartetus nanus), a small (25 g) nectar-feeding marsupial from eastern Australia. Females at our coastal site produced 1–3 litters (frequently of 5–6 young) over an 8-month period within the flowering period of the dominant food plant (Banksia ericifolia). The number of lactating females over time was highly correlated (R = 0.9) with the abundance of flowers on B. ericifolia, suggesting that flower availability has a substantial influence on breeding. To assess the generality of these findings and investigate whether elevation or latitude influence breeding in this species, we examined the breeding traits previously described at three other locations. Females on the tableland 70 km away produced one litter of 3–4 young over a 4-month period within the flowering period of B. ericifolia, the dominant food plant. At other coastal and tableland locations 500 km away, coastal females produced larger numbered litters more often than tableland females. A hypothesis relating to minimum temperature appears the most plausible explanation for this pattern that reflects elevation but not latitude. The mean minimum temperature drops below 5 °C for 2–5 months each year at the tableland locations but not at all at the coastal locations. Low temperatures are known to reduce nectar secretion in the dominant food plants. Thus, although the breeding traits of the eastern pygmy-possum are influenced by flowering in their dominant food plants, low temperature appears to impose a constraint on reproductive output.

Keywords

Reproduction Elevation gradient Litter size variation Temperature 

Notes

Acknowledgements

This research was conducted under animal ethics approvals from Southern Cross University (11/33, 12/39, 13/52, 14/44) and a New South Wales government scientific licence (SL100161). This paper has been improved by the suggestions of two anonymous referees.

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Copyright information

© The Ecological Society of Japan 2018

Authors and Affiliations

  1. 1.School of Environment, Science and EngineeringSouthern Cross UniversityLismoreAustralia

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