Brood parasitism can strongly impact songbird productivity and was a major factor resulting in the historical decline of the Kirtland’s warbler. We found contemporary cowbird brood parasitism rates were around 1.5% within the primary breeding area of the Kirtland’s warbler, the species can withstand a reduction in productivity of 13–18% before declining, and high parasitism rates in the peripheral breeding area are sustainable long-term if cowbird removal occurs in the core breeding area. Our study provides parasitism thresholds to assist with development of management strategies to ensure long-term viability of this conservation-reliant species. Photograph by Nathan W. Cooper.
Wildlife Research
Volume 50 Number 10 2023
The ethical and welfare challenges with radio tracking animals is ensuring that the device is removed from the animal at the conclusion of the study. We tested two types of collar break-away mechanisms, designed to release the collars over time. One is Cotton Thread weak-link and a second Timed Release Device. For both break-away types, the release timing was unpredictable, and poor collar recovery rates show the importance in adding camera traps to monitor collared animals. Photograph by Leticia F. Povh.
WR21176 Abstract | WR21176 Full Text | WR21176PDF (1.9 MB) Open Access Article
WR21063Vegetation cover and configuration drive reptile species distributions in a fragmented landscape
Reptiles are vulnerable to habitat loss and fragmentation, yet the influence of landscape structure on species distributions is unknown. In this study we modelled the distributions of 40 reptile species in Victoria, Australia, and found that the cover and spatial configuration of native vegetation influence the distribution of most species. Knowledge of how landscape structure influences species’ distributions will help to improve biodiversity management in fragmented landscapes. Photograph by S. J. Mulhall.
WR21063 Abstract | WR21063 Full Text | WR21063PDF (3.7 MB) Open Access Article
WR22070Evaluation of oral baits and distribution methods for Tasmanian devils (Sarcophilus harrisii)†
This study aimed to test oral baits as potential vaccine-delivery vehicles for Tasmanian devils. Captive and wild devils consumed placebo versions of commercial baits used on mainland Australia. Abundant non-target species, such as brushtail possums, Tasmanian pademelons, and eastern quolls consumed most baits in the wild. Implementation of automated bait dispensers increased bait uptake by devils to over 50% at the same regional field sites. Photograph by Jennifer M. Moffat.
WR22070 Abstract | WR22070 Full Text | WR22070PDF (2 MB) | WR22070Supplementary Material (1.3 MB) Open Access Article
WR22018Implications of habitat overlap between giant panda and sambar for sympatric multi-species conservation
We analysed overlap in the habitat area and habitat suitability between giant panda (Ailuropoda melanoleuca) and sambar (Rusa unicolor) to examine potential sympatric species competition. The results indicate that the similarity of habitat requirements between the two species is high. In addition, the competition for space use among populations of the two species could intensify as the sambar population increases. Niche overlap and interspecific competition between sympatric species should be a stronger focus in endangered species conservation. We suggest strengthening the habitat restoration and establishment of corridors for all key species to alleviate the increased competition associated with niche overlap among sympatric species. Photograph by camera trap.
WR22018 Abstract | WR22018 Full Text | WR22018PDF (4 MB) Open Access Article
WR21148Bird community structure and habitat association in Owabi Wildlife Sanctuary, Ashanti Region (Ghana)
Global bird population decline has led to renewed interest in bird–habitat selection studies. This study, which aimed at assessing bird habitat preference, found the farmlands and built-up as the most preferred habitats, whereas the open water was the least preferred. The forest reserve was the most diverse, owing to food availability and less disturbance. The findings highlighted the need to incorporate habitat demographic information into conservation planning and management. Photograph by Rockson Acolatse.
WR22136Understanding the zoonotic pathogen, Coxiella burnetii in Australian fur seal breeding colonies through environmental DNA and genotyping
Infectious diseases such as Q-fever (Coxiella) often contribute to reproductive failure in terrestrial mammals. We investigated whether this pathogen could be detected in the environment and in Australian fur seal placentas by using molecular techniques. Our results indicated that Coxiella burnetii is present in two of the largest breeding colonies and that environmental DNA can be used to survey for infected colonies. Photograph by Hanna Geeson.
WR22136 Abstract | WR22136 Full Text | WR22136PDF (2.7 MB) Open Access Article
Avian assemblages were surveyed using a transect-point method before and after aerial applications of an organophosphorous insecticide, fenitrothion, for locust control. No pesticide-related differences in assemblages were detected between sprayed and unsprayed sites using multi-dimensional scaling (MDS) and permutational multivariate analysis of variance (PERMANOVA) analysis techniques. Although sublethal impacts on individuals have been identified in previous research, landscape-level changes in Australian avian assemblages resulting from single fenitrothion applications appear unlikely, provided spraying protocols remain unchanged. Photograph by Wim C. Mullié.
A key threat to koalas in some parts of their home range is vehicle strikes. Understanding what may encourage people to be more vigilant and drive slowly in areas with significant numbers of koalas is an important research undertaking. This paper identifies values-based segments that influence the intention to slow down significantly; and demonstrates the necessity of using segmentation to guide conservation program planning to decrease driving speed. Photograph by https://unsplash.com/s/photos/koala.
WR21172 Abstract | WR21172 Full Text | WR21172PDF (1.3 MB) Open Access Article