scispace - formally typeset
Search or ask a question
Topic

Occupancy

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


Papers
More filters
Journal ArticleDOI
TL;DR: The basic predictions of the abundance-occupancy rule are supported and its consistency and stability in species and groups of varying life-history characteristics are demonstrated.
Abstract: Summary 1. Abundance‐occupancy relationships comprise some of the most general and well-explored patterns in macro-ecology. The theory governing these relationships predicts that species will exhibit a positive interspecific and intraspecific relationship between regional occupancy and local abundance. Abundance‐occupancy relationships have important implications in using distributional surveys, such as atlases, to understand and document large-scale population dynamics and the consequences of environmental change. A basic need for interpreting such data bases is a better understanding of whether changes in regional occupancy reflect changes in local abundance across species of varying life-history characteristics. 2. Our objective was to test the predictions of the abundance‐occupancy rule using two independent data sets, the New York State Breeding Bird Atlas and the North American Breeding Bird Survey. The New York State Breeding Bird Atlas consists of 5332 25-km 2 survey blocks and is one of the first atlases in the USA to be completed for two time periods (1980‐85 and 2000‐05). The North American Breeding Survey is a large-scale annual survey intended to document the relative abundance and population change of songbirds throughout the USA. 3. We found that regional occupancy was positively correlated with relative abundance across 98 ( β = 0·60 ± 0·11 SE, P < 0·001, R 2 = 0·60) and 85 species ( β = 0·67 ± 0·06 SE, P < 0·001, R 2 = 0·57) in two separate time periods. This relationship proved stable over time and was notably consistent between breeding habitat groups and migratory guilds. 4. Between 1980 and 2005, changes in regional occupancy were highly correlated with long-term abundance trend estimates for 75 species ( β = 5·73 ± 0·24 SE, P < 0·001, R 2 = 0·88). Over a 20-year period, woodland and resident birds showed an increase in occupancy while grassland species showed the greatest decline; these patterns were mirrored by changes in local abundance. 5. Although exceptions existed, we found most changes in occupancy parallel changes in local abundance. These findings support the basic predictions of the abundance‐occupancy rule and demonstrate its consistency and stability in species and groups of varying life-history characteristics.

80 citations

ReportDOI
01 Jan 1990
TL;DR: In this article, a sampling scheme is proposed to estimate the proportion of sampled units (Spotted Owl Habitat Areas (SOHAs) or randomly sampled 1000-acre polygon areas (RSAs)) occupied by spotted owl pairs.
Abstract: A basic sampling scheme is proposed to estimate the proportion of sampled units (Spotted Owl Habitat Areas (SOHAs) or randomly sampled 1000-acre polygon areas (RSAs)) occupied by spotted owl pairs. A bias adjustment for the possibility of missing a pair given its presence on a SOHA or RSA is suggested. The sampling scheme is based on a fixed number of visits to a sample unit (a SOHA or RSA) in which the occupancy is to be determined. Once occupancy is determined, or the maximum number of visits is reached, the sampling is completed for that unit. The resulting data are summarized as a set of independent Bernoulli trials; a zero (no occupancy) or one (occupancy) is recorded for each unit. The occupancy proportion is the sum of these Bernoulli trials divided by the sample size. The bias adjustment estimates this occupancy proportion for the estimated number of units on which a pair of owls was present but not detected. The bias adjustment requires the recording of the number of the visit during which occupancy was first detected. The distributional assumptions are checked with five different sets of data.

80 citations

Journal ArticleDOI
TL;DR: In this article, an occupant response shelter escape time (ORSET) model is advocated as a framework unifying aspects of psychology, architecture, engineering and facilities management to define people's knowledge of their surroundings.

79 citations


Network Information
Related Topics (5)
Land use
57K papers, 1.1M citations
73% related
Urban planning
52.4K papers, 859.1K citations
73% related
Sustainability
129.3K papers, 2.5M citations
72% related
Ecosystem services
28K papers, 997.1K citations
72% related
Sampling (statistics)
65.3K papers, 1.2M citations
71% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023669
20221,420
2021234
2020217
2019236
2018209