VARIABILITY IN GRASSLAND BIRD COUNTS RELATED TO OBSERVER DIFFERENCES AND SPECIES DETECTION RATES

By D. Diefenbach, Daniel W. Brauning, Jennifer A. Mattice. 2003

247 citations recorded by the source corpus.

Subfields: Developmental Biology, Ecology

View Paper: https://www.semanticscholar.org/paper/2504d1b81fe0a6cd91168f19ff7101d5cc66cf95

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In Ecology

Citations in the corpus

INCORPORATING AVAILABILITY FOR DETECTION IN ESTIMATES OF BIRD ABUNDANCE (2007, methodology): “For example, Diefenbach et al. (2003) noted that use of distance sampling to monitor grassland birds may not detect all birds on or near the transect line, because birds must sing and be visible to be detected.”
IMPROVING ESTIMATES OF BIRD DENSITY USING MULTIPLE- COVARIATE DISTANCE SAMPLING (2007, background): “In reality, in addition to its distance from the line or point, the probability of detecting a bird depends on many factors, including the habitat, weather conditions, observer, bird behavior, etc. (Diefenbach et al. 2003 and references therein).”
POINT-TRANSECT SURVEYS FOR SONGBIRDS: ROBUST METHODOLOGIES (2006, background): “Diefenbach et al. (2003) give an excellent account of the consequences of failure to adjust for detectability in the case of strip-transect sampling, and Norvell et al. (2003) do the same for point counts.”
Birds as agents of seed dispersal in a human-dominated landscape in southern Costa Rica (2008, methodology): “Therefore, we have instead attempted to reduce observer- and visibilitybias by using a single expert observer in relatively open countryside and by standardizing transect and survey length (Diefenbach et al., 2003).”
The impact of shrub encroachment on savanna bird diversity from local to regional scale (2009, unknown): “This high variance in estimated species richness is likely owing to the usually low detection probability of grassland species (Diefenbach et al. , 2003) likely due to higher predation rates in open landscapes (Boulinier et al. , 1998).”
In Defense of Indices: The Case of Bird Surveys (2008, background): “Diefenbach et al. (2003) further found that, when sample sizes were adequate (.50), detection functions varied among observers, which suggests that the lack of significant differences between detection functions was due to small sample sizes, not to the lack of real differences.”
Estimating species richness: calibrating a large avian monitoring programme (2005, result): “Because species differ so much with respect to size, colour, behaviour, habitat and density, heterogeneity among species in detectability can be expected a priori and has indeed been found in previous studies (Boulinier et al . 1998a; Diefenbach, Brauning & Mattice 2003; Kery, Royle & Schmid 2005)”
ESTIMATING DETECTION PROBABILITY AND DENSITY FROM POINT-COUNT SURVEYS: A COMBINATION OF DISTANCE AND DOUBLE-OBSERVER SAMPLING (2006, background): “The shortcomings of unadjusted point counts have long been recognized (Barker and Sauer 1995, Rosenstock et al. 2002, Thompson 2002, Diefenbach et al. 2003, Norvell et al. 2003, Farnsworth et al. 2005, and others), and our results further substantiate recommendations to abandon their use for…”