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Assessment of Mouse Judgment Bias through an Olfactory Digging Task
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Returning a lost process by reintroducing a locally extinct digging marsupial.

Nicola T Munro1, Sue McIntyre1, Ben Macdonald2

  • 1Fenner School of Environment and Society, Australian National University, Canberra, ACT, Australia.

Peerj
|June 11, 2019
PubMed
Summary
This summary is machine-generated.

Eastern bettongs (Bettongia gaimardi) are effective ecosystem engineers, significantly contributing to soil disturbance and potential woodland restoration through their digging. Their activity surpasses other native and introduced fauna in degraded Australian landscapes.

Keywords:
BioturbationEcosystem engineeringReintroductionRestorationSoil processes

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Area of Science:

  • Ecological Restoration
  • Ecosystem Engineering
  • Marsupial Ecology

Background:

  • The eastern bettong (Bettongia gaimardi), a digging marsupial, was reintroduced to mainland Australia after a century-long absence.
  • Temperate woodlands degraded by livestock grazing may benefit from the soil disturbance created by bettong digging.
  • Understanding the bettong's digging capacity is crucial to assess its role as an ecosystem engineer and its potential for ecological restoration.

Purpose of the Study:

  • To investigate the digging capacity of the eastern bettong.
  • To compare the digging activity of bettongs with other extant fauna.
  • To determine if bettongs qualify as ecosystem engineers capable of restoring ecological processes.

Main Methods:

  • Quantified foraging pits created by eastern bettongs and other fauna in a reintroduced population.
  • Estimated the volume of soil displaced by bettong digging (kg soil per ha per year).
  • Analyzed the relationship between bettong digging activity and environmental factors (soil phosphorus, vegetation, grazing pressure).

Main Results:

  • Eastern bettongs were frequent diggers, responsible for over 55% of observed foraging pits at densities of 0.3-0.4 animals/ha.
  • An estimated 985 kg of soil per ha per year was dug by the bettong population.
  • Bettong digging was influenced by soil phosphorus, Acacia spp. basal area, and reduced kangaroo grazing, and they uniquely dug in scalded areas.

Conclusions:

  • Eastern bettongs exhibit significant digging capacity, exceeding that of other native and introduced species.
  • Their unique ability to disturb diverse soil types, including scalds, highlights their potential as ecosystem engineers.
  • Bettong reintroduction offers a promising strategy for enhancing soil processes and restoring degraded temperate woodlands.