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Occupancy

About: Occupancy is a research topic. Over the lifetime, 2757 publications have been published within this topic receiving 68288 citations.


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Journal ArticleDOI
TL;DR: In this article, the authors investigated how these factors affect modeled occupancy of 56 resident bird species using a landscape-scale multi-season occupancy framework across 24 intensively cultivated and human-dominated districts in Uttar Pradesh state, north India.
Abstract: Biodiversity persistence in non-woody tropical farmlands is poorly explored, and multi-species assessments with robust landscape-scale designs are sparse. Modeled species occupancy in agricultural mosaics is affected by multiple factors including survey methods (convenience-based versus systematic), landscape-scale agriculture-related variables, and extent of remnant habitat. Changes in seasonal crops can additionally alter landscape and habitat conditions thereby influencing species occupancy. We investigated how these factors affect modeled occupancy of 56 resident bird species using a landscape-scale multi-season occupancy framework across 24 intensively cultivated and human-dominated districts in Uttar Pradesh state, north India. Convenience-based roadside observations provided considerable differences in occupancy estimates and associations with remnant habitat and intensity of cultivation relative to systematic transect counts, and appeared to bias results to roadside conditions. Modeled occupancy of only open-area species improved with increasing intensity of cultivation, while remnant habitat improved modeled occupancy of scrubland, wetland and woodland species. Strong seasonal differences in occupancy were apparent for most species across all habitat guilds. Further habitat loss will be most detrimental to resident scrubland, wetland and woodland species. Uttar Pradesh’s agricultural landscape has a high conservation value, but will require a landscape-level approach to maintain the observed high species richness. Obtaining ecological information from unexplored landscapes using robust landscape-scale surveys offers substantial advantages to understand factors affecting species occupancy, and is necessary for efficient conservation planning.

22 citations

01 Jan 2006
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22 citations

Journal ArticleDOI
18 Aug 2015-PLOS ONE
TL;DR: Regional occupancy dynamics of American mink and muskrats in a highly altered agroecosystem in Illinois, USA are evaluated and patterns are striking, but a more mechanistic understanding is needed of how semiaquatic species in human-modified ecosystems will respond ecologically in situ to extreme weather events predicted by climate-change models.
Abstract: Climate change is predicted to increase the frequency of droughts and intensity of seasonal precipitation in many regions. Semiaquatic mammals should be vulnerable to this increased variability in precipitation, especially in human-modified landscapes where dispersal to suitable habitat or temporary refugia may be limited. Using six years of presence-absence data (2007–2012) spanning years of record-breaking drought and flood conditions, we evaluated regional occupancy dynamics of American mink (Neovison vison) and muskrats (Ondatra zibethicus) in a highly altered agroecosystem in Illinois, USA. We used noninvasive sign surveys and a multiseason occupancy modeling approach to estimate annual occupancy rates for both species and related these rates to summer precipitation. We also tracked radiomarked individuals to assess mortality risk for both species when moving in terrestrial areas. Annual model-averaged estimates of occupancy for mink and muskrat were correlated positively to summer precipitation. Mink and muskrats were widespread during a year (2008) with above-average precipitation. However, estimates of site occupancy declined substantially for mink (0.56) and especially muskrats (0.09) during the severe drought of 2012. Mink are generalist predators that probably use terrestrial habitat during droughts. However, mink had substantially greater risk of mortality away from streams. In comparison, muskrats are more restricted to aquatic habitats and likely suffered high mortality during the drought. Our patterns are striking, but a more mechanistic understanding is needed of how semiaquatic species in human-modified ecosystems will respond ecologically in situ to extreme weather events predicted by climate-change models.

22 citations

Journal ArticleDOI
TL;DR: Canada is an international leader in the methodology of traditional land use and occupancy mapping as a result of the negotiation process for settling comprehensive land claims in the North, especially in the context of forest planning and management in the northern Alberta Forest Management Agreement areas.
Abstract: Canada is an international leader in the methodology of traditional land use and occupancy mapping as a result of the negotiation process for settling comprehensive land claims in the North. Since the early 1980s this methodology has found increasing application in the Canadian mid-North, especially in the context of forest planning and management in the northern Alberta Forest Management Agreement (FMA) areas. The goals of traditional land use and occupancy mapping in these FMAs include collection and preservation of traditional environmental knowledge, integration of this knowledge into forest planning and management and, for the Aboriginal communities, active participation in decision-making processes in order to attain sustainable forest management. While the first goal is often met in mapping projects, goals two and three are proving harder to achieve because of conflicting government policy agendas, differing paradigms of community development in society at large, and the lack of recognition and leg...

22 citations

Journal ArticleDOI
TL;DR: This article investigated the role of fire history and hummock grass cover in the occurrence of feral cats and rare rodents, including the critically endangered central rock-rat (Zyzomys pedunculatus), in a mountain refuge in central Australia.
Abstract: Context Feral cats (Felis catus) are implicated in the ongoing decline of Australian mammals. New research from northern Australia suggests that predation risk from feral cats could be managed by manipulating fire regimes to increase grass cover. Aims We investigate the role of fire history and hummock grass cover in the occurrence of feral cats and rare rodents, including the critically endangered central rock-rat (Zyzomys pedunculatus), in a mountain refuge in central Australia. Methods We installed 76 camera stations across four sites in the West MacDonnell National Park and used occupancy modelling to evaluate the influence of recent fire (within 5 years), hummock grass cover and ruggedness on feral cat and rodent occupancy. Key results Occupancy of the central rock-rat was positively associated with areas burnt within the past 5 years – a relationship probably driven by increased food resources in early succession vegetation. In contrast, the desert mouse (Pseudomys desertor) was detected at locations with dense hummock grass that had remained unburnt over the same period. Feral cats were widespread across the study area, although our data suggest that they forage less frequently in areas with dense hummock grass cover. Conclusions Our results suggest that fire management and grass cover manipulation can be used as a tool for rodent conservation in this environment and potentially elsewhere in arid Australia. Implications Creating food-rich patches within dense hummock grasslands may allow central rock-rats to increase occupancy while simultaneously affording them protection from predation. Landscape-scale wildfire resulting in a single post-fire vegetation age class is likely to be unfavourable for native rodents in this environment.

22 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023669
20221,420
2021234
2020217
2019236
2018209