Bamford Consulting Ecologists

Kingsley, Australia

Bamford Consulting Ecologists

Kingsley, Australia
Time filter
Source Type

Clemens R.S.,University of Queensland | Rogers D.I.,Arthur Rylah Institute for Environmental Research | Hansen B.D.,University of Vic | Gosbell K.,Victorian Wader Study Group | And 19 more authors.
Emu | Year: 2016

Decreases in shorebird populations are increasingly evident worldwide, especially in the East Asian-Australasian Flyway (EAAF). To arrest these declines, it is important to understand the scale of both the problem and the solutions. We analysed an expansive Australian citizen-science dataset, spanning the period 1973 to 2014, to explore factors related to differences in trends among shorebird populations in wetlands throughout Australia. Of seven resident Australian shorebird species, the four inland species exhibited continental decreases, whereas the three coastal species did not. Decreases in inland resident shorebirds were related to changes in availability of water at non-tidal wetlands, suggesting that degradation of wetlands in Australia's interior is playing a role in these declines. For migratory shorebirds, the analyses revealed continental decreases in abundance in 12 of 19 species, and decreases in 17 of 19 in the southern half of Australia over the past 15 years. Many trends were strongly associated with continental gradients in latitude or longitude, suggesting some large-scale patterns in the decreases, with steeper declines often evident in southern Australia. After accounting for this effect, local variables did not explain variation in migratory shorebird trends between sites. Our results are consistent with other studies indicating that decreases in migratory shorebird populations in the EAAF are most likely being driven primarily by factors outside Australia. This reinforces the need for urgent overseas conservation actions. However, substantially heterogeneous trends within Australia, combined with declines of inland resident shorebirds indicate effective management of Australian shorebird habitat remains important. © BirdLife Australia 2016.

Bamford M.J.,Bamford Consulting Ecologists | Bamford M.J.,Murdoch University | Calver M.C.,Murdoch University
Australian Zoologist | Year: 2015

Fauna surveys to determine the species richness, relative abundance and community structure of reptile assemblages are often important first steps in their conservation. Several sampling techniques are commonly used. Most involve trapping and assume a simple relationship between the absolute abundance of a species and the index of abundance obtained by sampling. However, comparing the effectiveness of different trapping techniques reveals biases among techniques. Therefore, without knowing absolute abundance, bias in a trapping technique can only be determined relative to other, biased techniques.To investigate this issue, measures of absolute abundance of reptiles were obtained by intensively searching measured quadrats (total removal plots), usually 5 m by 5 m, in two areas, with results compared with those obtained from pitfall trapping in one of these areas. Pitfall trapping was extremely biased towards large, surface-active lizards compared with the reptile assemblage determined by total removal, which was numerically dominated by small, fossorial species.Trapping data are influenced by the morphology and life history of a reptile species compared with results from total removal plots.Therefore, searching may provide a baseline for interpreting abundance data from trapping techniques, and for studies of population dynamics critical to assessing a population's robustness and its response to impacts.

Bamford M.J.,Bamford Consulting Ecologists | Calver M.C.,Murdoch University
Open Conservation Biology Journal | Year: 2012

From observations conducted in a suburban property in Perth, Western Australia, over 22 years, it appears that a single pet cat may have exterminated a population (est. 40-50 animals) of the lizard Ctenotus fallens over two years, but with the greatest impact in just the first few months. C. fallens did not begin to recolonise the site until six years after the cat had moved away. The observations support the hypothesis that extinctions of wildlife in suburbia following the introduction of cats can be swift. They also suggest that C. fallens is a suitable species for reintroduction experiments into suburban Perth, comparing the success of reintroductions at sites where cats are confined with those where cats roam freely. © Bamford and Calver; Licensee Bentham Open.

Bamford M.J.,Bamford Consulting Ecologists | Moro D.,Chevron
Corella | Year: 2011

This study of nest site selection of the White-winged Fairy-wren Malurus leucopterus edouardi on Barrow Island showed that they favoured vegetation that included Melaleuca cardiophylla shrubs but were observed in a range of vegetation types, some of which where M. cardiophylla was not well represented. Nests were found in M. cardiophylla, Acacia bivenosa, A. coriacea, Hakea lorea, Grevillea pyramidalis, Triodia angusta and T. wiseana. Crushed Triodia sp. leaves and flowers stalks were important nest-building materials, and shrubs such as A. coriacea and A. bivenosa offered good perches in an otherwise sparse to open vegetated arid environment. White-winged Fairy-wrens were also found to nest along roadways on Barrow Island in areas without M. cardiophylla. While sightings of White-winged Fairy-wrens were predominately among M. cardiophylla, it did not appear to be reliant upon this shrub for its nesting requirements, suggesting, that on Barrow Island this subspecies has generalist nesting requirements.

Turpin J.M.,Bamford Consulting Ecologists | Bamford M.J.,Bamford Consulting Ecologists
Australian Mammalogy | Year: 2015

A fauna survey was conducted within the Throssell and Broadhurst Ranges in the Little Sandy Desert Bioregion of Western Australia during August and September 2012. The endangered northern quoll (Dasyurus hallucatus) was recorded from two distinct locations of similar habitat: deep dissected rocky gorges containing caves and permanent waterholes. One individual was photographed by a motion-sensitive camera and several scats were collected, with mitochondrial DNA analysis confirming the identification. These records represent a significant range extension (∼200km) and due to habitat restrictions are likely to represent the very eastern extreme of the species' range.

Loading Bamford Consulting Ecologists collaborators
Loading Bamford Consulting Ecologists collaborators