Publications
Historical perspectives on the mangroves of Kakadu National Park
Recent research reveals significant redistribution and dieback of mangroves in Kakadu National Park. While net area changes have been minor, lower-stature mangrove species like Avicennia marina and Sonneratia alba have shown substantial shifts due to inland intrusion and seaward colonization. Aerial surveys conducted in 2016 confirmed widespread dieback, with RapidEye data indicating this occurred between late 2015 and 2016, coinciding with broader mangrove losses in the Gulf of Carpentaria. The study, utilizing historical aerial photography, CASI imagery, LIDAR, and RapidEye data, underscores the need for enhanced long-term monitoring to protect these critical coastal ecosystems.
Out of the frying pan: Reintroduction of toad‐smart northern quolls to southern Kakadu National Park
A reintroduction effort of northern quolls (Dasyurus hallucatus) to Kakadu National Park, where invasive cane toads (Rhinella marina) pose a significant threat, revealed critical insights into species survival and conservation strategies. The study found that quolls conditioned with taste aversion training to avoid toxic toads survived significantly longer than unconditioned individuals, with some even recorded mating. However, predator aversion training proved less effective, as dingo predation accounted for substantial mortality among the reintroduced quolls. This suggests that while behavioral conditioning can mitigate immediate threats like cane toads, long-term survival is hindered by other ecological pressures, such as predation and potential loss of predator-avoidance behaviors in isolated populations. These findings underscore the complexity of reintroduction efforts for endangered species and highlight the need for comprehensive strategies addressing multiple ecological challenges.
Small mammals decline with increasing fire extent in northern Australia: evidence from long-term monitoring in Kakadu National Park
A decade-long study in Kakadu National Park, Australia, reveals that small mammal populations decline significantly with increasing fire extent, rather than just fire frequency or patchiness. Fire extent—a measure combining fire size and frequency—was the strongest predictor of mammal declines, surpassing other metrics like the proportion of surrounding area burnt. Large, less patchy fires, which exceed the home range scales of small mammals, are particularly detrimental, suggesting limited escape options for these species. Despite ongoing management efforts, current fire regimes remain harmful to native mammals, underscoring the need for more targeted strategies to reduce fire size and mitigate biodiversity loss.
Predicting Visitor Satisfaction in Parks: Comparing the Value of Personal Benefit Attainment and Service Levels in Kakadu National Park, Australia
A key insight from this study is that the benefits visitors attain during their experience—such as those derived from nature and relaxation—are stronger predictors of overall satisfaction with Kakadu National Park than traditional measures of service quality. The research compares two approaches: assessing visitor service quality and measuring the attainment of perceived benefits, revealing that the latter has a more significant impact on positive responses to park visits. Factor analysis identified distinct types of benefits, which showed varying correlations with satisfaction based on visitors' proximity to the park. This finding suggests that park managers should prioritize creating experiences that facilitate the attainment of desired benefits, rather than solely focusing on service quality improvements.
Monitoring indicates rapid and severe decline of native small mammals in Kakadu National Park, northern Australia
A rapid and severe decline of native small mammals has been documented in Kakadu National Park, northern Australia, challenging the assumption that its mammal fauna remained intact. Over a 13-year study (1996–2009), species richness and total abundance decreased by 54% and 71%, respectively, with 10 out of 25 recorded species showing significant declines. The most pronounced losses were observed in northern quoll, fawn antechinus, northern brown bandicoot, common brushtail possum, and pale field-rat. The study employed consistent sampling across plots representing environmental variation and fire regimes, using regression analysis and Wilcoxon matched-pairs tests to assess change. Declines correlated with increased fire frequency, suggesting that too frequent fires, predation by feral cats, and cane toad invasion may be contributing factors. These findings indicate a major conservation crisis in northern Australia, comparable to the losses seen elsewhere on the continent.
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