Dry season habitat use by critically endangered white‐shouldered ibis in northern Cambodia

Wright, Hugh L.; Buckingham, D. L.; Dolman, Paul M.

doi:10.1111/j.1469-1795.2009.00301.x

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Its populations are small and declining, with ~200 individuals remaining across a small number of protected areas [ 36 ]. The giant ibis relies on deciduous dipterocarp forests and waterholes for forage in the shallow water and saturated mud [ 37 ]. The birds breed during the wet season, pairing and nesting between June and September [ 35 ].…”

Section: Methodsmentioning

confidence: 99%

Quantifying the availability of seasonal surface water and identifying the drivers of change within tropical forests in Cambodia

Mamalis,

Arnold,

Mahood

et al. 2024

PLoS ONE

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Surface freshwater is a vital resource that is declining globally, predominantly due to climate and land use changes. Cambodia is no exception and the loss threatens many species, such as the giant ibis a Critically Endangered waterbird. We aimed to quantify the spatial and temporal (2000–2020) change of surface water availability across northern and eastern Cambodia and to assess the impact of this on the giant ibis. We used a Random Forest Classifier to determine the changes and we tested the impact of land use and geographical covariates using spatially explicit regression models. We found an overall reduction of surface water availability of 4.16%. This was predominantly driven by the presence of Economic Land Concessions and roads which increased the probability of extreme drying and flooding events. The presence of protected areas reduced these probabilities. We found changes in precipitation patterns over the wider landscape did not correlate with changes in surface water availability, supporting the overriding influence of land use change. 98% of giant ibis nests recorded during the time period were found within 25m of surface water during the dry season, highlighting their dependency on surface water. The overall surface water decline resulted in a 25% reduction in dry season suitable habitat for the giant ibis. Although absolute changes in surface water over the whole area were relatively small, the impact on the highest quality habitat for ibis is disproportionate and therefore threatens its populations. Defining the threats to such an endangered species is crucial for effective management.

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Section: Methodsmentioning

confidence: 99%

Quantifying the availability of seasonal surface water and identifying the drivers of change within tropical forests in Cambodia

Mamalis,

Arnold,

Mahood

et al. 2024

PLoS ONE

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“…Currently available data provide preliminary results that ongoing surveys (conducted until 2011) will confirm. White‐shouldered Ibis appear to stop visiting seasonal pools in the forest after the first rains in April/May (Wright et al. 2009).…”

Section: Implementation and Findingsmentioning

confidence: 99%

Establishing a national monitoring programme for White‐shouldered Ibis in Cambodia

Wright

Vorsak

Collar

et al. 2009

Ibis

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“…Deciduous dipterocarp forests are also highly seasonal habitats, experiencing 5–6 months of drought per year (Miles et al, 2006). In such dry tropical habitats, water and food resource availability may be limiting factors for the distributions, movements and home ranges of many species during the dry season (Aung et al, 2001; Redfern et al, 2003), and waterholes are likely to be a substantial component of water surface availability, providing important water resources and foraging habitat for many species (Keo, 2008; Wakefield et al, 2008; Wright et al, 2010; Wright et al, 2012). Utilization of waterholes by wildlife is also likely to be higher during the dry season (Wakefield et al, 2008; Wright et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…During the dry season water availability is mainly limited to perennial rivers and waterholes, which are an essential part of the forest and are used by several of these threatened large species (Keo, 2008; Wright et al, 2012; Gray et al, 2015b). However, little is known about the relationship between wildlife and waterholes in South-east Asian deciduous dipterocarp forests with the exception of two studies on the giant and white-shouldered ibises (Wright et al, 2010, 2012). Although these studies suggested waterholes are important for these two species, it is largely unknown how they impact the other threatened species in this landscape and, for example, how the morphological characteristics of the waterholes affect usage.…”

Section: Introductionmentioning

confidence: 99%

Utilization of waterholes by globally threatened species in deciduous dipterocarp forest of the Eastern Plains Landscape of Cambodia

Ngoprasert

Gray³

et al. 2018

Oryx

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Deciduous dipterocarp forests throughout Asia provide crucial habitat for several globally threatened species. During the dry season water availability in these forests is primarily limited to perennial rivers and waterholes. Such water sources form an essential part of these dry forests and are used by multiple species, including large mammals and birds, but little is known regarding how waterhole characteristics affect wildlife use. We investigated waterhole utilization by six globally threatened dry forest specialists: banteng Bos javanicus, Eld's deer Rucervus eldii, giant ibis Thaumatibis gigantea, green peafowl Pavo muticus, lesser adjutant Leptoptilos javanicus and Asian woolly-necked stork Ciconia episcopus. We camera-trapped 54 waterholes in Srepok Wildlife Sanctuary, eastern Cambodia, during the dry season of December 2015–June 2016. We measured nine waterhole and landscape characteristics, including indicators of human disturbance. Waterhole depth (measured every 2 weeks) and the area of water at the start of the dry season were the main environmental factors influencing waterhole use. Additionally, waterholes further from villages were more frequently used than those nearer. Our study reaffirmed the importance of waterholes in supporting globally threatened species, especially large grazers, which are critical for maintaining these dry forest ecosystems. The results also suggested that artificially enlarging and deepening selected waterholes, particularly those further from human disturbance, could enhance available habitat for a range of species, including grazers. However, this would need to be conducted in coordination with patrolling activities to ensure waterholes are not targets for illegal hunting, which is a problem throughout South-east Asian protected areas.

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Dry season habitat use by critically endangered white‐shouldered ibis in northern Cambodia

Cited by 6 publications

References 14 publications

Quantifying the availability of seasonal surface water and identifying the drivers of change within tropical forests in Cambodia

Quantifying the availability of seasonal surface water and identifying the drivers of change within tropical forests in Cambodia

Establishing a national monitoring programme for White‐shouldered Ibis in Cambodia

Utilization of waterholes by globally threatened species in deciduous dipterocarp forest of the Eastern Plains Landscape of Cambodia

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