Managing kangaroo grazing for the conservation of grassland and grassy woodland fauna
type: CreativeWork
description: Large mammalian grazers are ecosystem engineers that alter the resources available to other species through selective consumption of plant matter, redistribution of nutrients and trampling. While some level of grazing is considered critical for maintaining species diversity, alteration to natural grazing regimes can have a severe impact on native biodiversity. Restoration of grazing regimes which promote conservation of biodiversity is a priority in many protected areas. However, the ability to achieve this goal is limited by a lack of understanding of what ‘appropriate’ grazing regimes for conservation of biodiversity are. In south-eastern Australia, high intensity grazing by the native eastern grey kangaroo (Macropus giganteus) has been linked to the decline of multiple taxa. While efforts to manage the impact of kangaroo grazing on other taxa have been undertaken, the effectiveness of these interventions are limited by a lack of knowledge of what constitutes optimal grazing levels. In this thesis, I used kangaroo population counts, tree canopy cover maps, ground vegetation structure, and reptile and birds counts to investigate the relationship between kangaroos, grass structure, and fauna. I found that: 1) there was a strong negative relationship between the abundance of kangaroos and grass structure (Paper I); 2) high intensity kangaroo grazing had a negative effect on the reptile community (Paper I); 3) birds with similar traits favoured similar grazing intensities, with different grazing intensities favoured by different trait groups (Paper II); 4) the occurrence of a threatened grassland reptile, the striped legless lizard (Delma impar) was positively related to fine scale grass complexity, and negatively related to kangaroo density at the broad scale (Paper III); 5) kangaroos selected forage habitat away from roads, in areas with a high cover of short grass (Paper IV); and 6) line transect sampling undertaken from vehicles driven along tracks can provide an …
abstract: Large mammalian grazers are ecosystem engineers that alter the resources available to other species through selective consumption of plant matter, redistribution of nutrients and trampling. While some level of grazing is considered critical for maintaining species diversity, alteration to natural grazing regimes can have a severe impact on native biodiversity. Restoration of grazing regimes which promote conservation of biodiversity is a priority in many protected areas. However, the ability to achieve this goal is limited by a lack of understanding of what ‘appropriate’ grazing regimes for conservation of biodiversity are. In south-eastern Australia, high intensity grazing by the native eastern grey kangaroo (Macropus giganteus) has been linked to the decline of multiple taxa. While efforts to manage the impact of kangaroo grazing on other taxa have been undertaken, the effectiveness of these interventions are limited by a lack of knowledge of what constitutes optimal grazing levels. In this thesis, I used kangaroo population counts, tree canopy cover maps, ground vegetation structure, and reptile and birds counts to investigate the relationship between kangaroos, grass structure, and fauna. I found that: 1) there was a strong negative relationship between the abundance of kangaroos and grass structure (Paper I); 2) high intensity kangaroo grazing had a negative effect on the reptile community (Paper I); 3) birds with similar traits favoured similar grazing intensities, with different grazing intensities favoured by different trait groups (Paper II); 4) the occurrence of a threatened grassland reptile, the striped legless lizard (Delma impar) was positively related to fine scale grass complexity, and negatively related to kangaroo density at the broad scale (Paper III); 5) kangaroos selected forage habitat away from roads, in areas with a high cover of short grass (Paper IV); and 6) line transect sampling undertaken from vehicles driven along tracks can provide an …
author: Howland, Brett William Allen
language: en
keywords: kangaroo, grazing, reptile, bird, grass, grasslands, box-gum woodland, grassy woodland
date published: 2016
date modified: 2026-07-24T00:54:51Z
provider: Australian National University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Australian National University

PropertyValue
property ID: Handle
value: http://hdl.handle.net/1885/109139