More information:

Lee, A.T.K., Fleming, C. and Wright, D.R. 2018. Modelling bird atlas reporting rate as a function of density in the southern Karoo, South Africa. Ostrich, 89(4): 363-372


Description:

Modelling bird atlas reporting rate as a function of density in the southern Karoo, South Africa.

Summary / Notes:

The relationship between true population density and abundance indices derived from atlas data can be used to estimate population size, a metric that is vital for assessing the conservation status of animal species. However, this relationship remains understudied. Meanwhile, there is growing concern for the avifauna of South Africa's arid southern Karoo region, which is threatened with an increasing frequency of heat waves as well as the expansion of infrastructure in association with uranium mining, renewable energy production and shale gas extraction. We calculated density (individuals km−2) for 49 bird species using data from a standardised distance-sampling survey conducted across 64 pentads (sampling areas of approximately 81 km2 in the southern Karoo region. Reporting rates from the Southern African Bird Atlas Project (SABAP) were explained by individual density for 32 of the 49 species using logistic regression models, and for 37 species using group (cluster) densities. Within this set of species, there was a positive correlation between mean reporting rate and log-transformed mean density in a linear model that included log-transformed mass as a covariate. For seven species with a high uncertainty associated with their density estimates (high relative standard error), we found that we could use our model to produce intuitively reasonable density estimates based on their SABAP2 reporting rates. This relationship suggests that where density estimate–reporting rate relationships for communities are known, they are useful for cross-checking density estimates. We illustrate the utility of this relationship by calculating population estimates for a set of species, and discuss the importance of SABAP2 for conservation purposes in the Karoo.

Year: 2018

Type: Journal Article

URL: https://doi.org/10.2989/00306525.2018.1553804


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Data titleYearOriginFile typeDownloadkml/kmz
SABAP: 104 Yellow-billed Duck
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 115 Comb Duck
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1997SABAPShapefile80 kb zip4 kb kmz
SABAP: 126 Black Kite
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1997SABAPShapefile80 kb zip4 kb kmz
SABAP: 136 Booted Eagle
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 148 African Fish-Eagle
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1997SABAPShapefile81 kb zip4 kb kmz
SABAP: 161 Gabar Goshawk
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1997SABAPShapefile82 kb zip12 kb kmz
SABAP: 173 Eurasian Hobby
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1997SABAPShapefile80 kb zip3 kb kmz
SABAP: 184 Grey Kestrel
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 199 Swainson's Spurfowl
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1997SABAPShapefile81 kb zip6 kb kmz
SABAP: 211 Corn Crake
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 226 Common Moorhen
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 240 African Jacana
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1997SABAPShapefile81 kb zip4 kb kmz
SABAP: 251 Greater Sand Plover
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 263 Terek Sandpiper
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 283 Broad-billed Sandpiper
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 294 Pied Avocet
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 305 Black-winged Pratincole
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 318 Sabine's Gull
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 337 Black Tern
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 034 Cory's Shearwater
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 367 Rosy-faced Lovebird
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1997SABAPShapefile82 kb zip12 kb kmz
SABAP: 384 African Emerald Cuckoo
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 396 African Scops-Owl
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1997SABAPShapefile81 kb zip6 kb kmz
SABAP: 406 Rufous-cheeked Nightjar
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1997SABAPShapefile81 kb zip7 kb kmz
SABAP: 421 African Palm-Swift
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1997SABAPShapefile81 kb zip6 kb kmz
SABAP: 432 African Pygmy-Kingfisher
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 445 Swallow-tailed Bee-eater
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1997SABAPShapefile83 kb zip18 kb kmz
SABAP: 455 Trumpeter Hornbill
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 470 Yellow-fronted Tinkerbird
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 488 Olive Woodpecker
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 516 Grey-backed Sparrowlark
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1997SABAPShapefile82 kb zip14 kb kmz
SABAP: 529 Rock Martin
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1997SABAPShapefile83 kb zip16 kb kmz
SABAP: 557 Cape Penduline-Tit
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1997SABAPShapefile81 kb zip6 kb kmz
SABAP: 056 Cape Cormorant
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1997SABAPShapefile80 kb zip3 kb kmz
SABAP: 604 Rufous-tailed Palm-Thrush
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 622 Layard's Tit-Babbler
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 658 Barred Wren-Warbler
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1997SABAPShapefile81 kb zip6 kb kmz
SABAP: 674 Red-faced Cisticola
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 701 Chinspot Batis
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1997SABAPShapefile80 kb zip4 kb kmz
SABAP: 719 Buffy Pipit
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1997SABAPShapefile80 kb zip3 kb kmz
SABAP: 751 Grey-headed Bush-Shrike
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 764 Cape Glossy Starling
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1997SABAPShapefile83 kb zip20 kb kmz
SABAP: 797 African Yellow White-eye
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 806 Scaly-feathered Finch
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1997SABAPShapefile83 kb zip20 kb kmz
SABAP: 083 White Stork
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1997SABAPShapefile80 kb zip3 kb kmz
SABAP: 854 Orange-breasted Waxbill
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 885 Cape Bunting
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 096 Greater Flamingo
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1997SABAPShapefile81 kb zip4 kb kmz
Ludwig, D.E. 1976. Wiederfunde. Mitteilungen Ornithologische Arbeitsgruppe SWA Wissenschaftliche Gesellschaft, 12(4): 2
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Kolberg, H. 2016. Wetland bird counts in Namibia: a summary. Lanioturdus, 49(5): 2-191
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