eCite Digital Repository

Contrasting population manipulations reveal resource competition between two large marsupials: bare-nosed wombats and eastern grey kangaroos

Citation

Tamura, J and Ingram, J and Martin, AM and Burridge, CP and Carver, S, Contrasting population manipulations reveal resource competition between two large marsupials: bare-nosed wombats and eastern grey kangaroos, Oecologia, 197 pp. 313-325. ISSN 0029-8549 (2021) [Refereed Article]


Preview
PDF
Pending copyright assessment - Request a copy
1Mb
  

DOI: doi:10.1007/s00442-021-04959-y

Abstract

Resource competition is an important interaction that can structure ecological communities, but is difficult to demonstrate in nature, and rarely demonstrated for large mammals including marsupials. We analysed 10 years of population survey data to investigate resource competition between bare-nosed wombats (Vombatus ursinus) and eastern grey kangaroos (Macropus giganteus) at two sites to assess whether resource competition is occurring. At one site, wombat abundance was reduced by increased mortality from mange disease, whereas at the other site, kangaroo abundance was reduced primarily by culling. We used the modified Lotka–Volterra competition (LVC) models to describe the mechanism of resource competition and fitted those models to the empirical data by maximum likelihood estimation. We found strong negative relationships between the abundance of wombats and kangaroos at each site, and resource competition was also mechanistically supported by the modified LVC models. The estimated competition coefficients indicate that bare-nosed wombats are a slightly superior competitor of eastern grey kangaroos than vice versa, and that intraspecific competition is almost twice as strong as interspecific competition. In addition, this study facilitated the calculation of the transmission rate associated with mange disease at one site (0.011), and the removal rate owing to culling, the introduction of a predator species, and drought at the other site (0.0006). Collectively, this research represents a rare empirical demonstration of resource competition between large mammals and contributes new insight into the ecology of two of Australia’s largest grazing marsupials.

Item Details

Item Type:Refereed Article
Keywords:wombat, Lotka–Volterra model, niche overlap, herbivore, mammal, exploitative competition
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Community ecology (excl. invasive species ecology)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Tamura, J (Ms Julie Tamura)
UTAS Author:Ingram, J (Ms Janeane Ingram)
UTAS Author:Martin, AM (Ms Alynn Martin)
UTAS Author:Burridge, CP (Associate Professor Christopher Burridge)
UTAS Author:Carver, S (Dr Scott Carver)
ID Code:147636
Year Published:2021
Deposited By:Zoology
Deposited On:2021-11-10
Last Modified:2021-11-29
Downloads:0

Repository Staff Only: item control page