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: 108 Red-billed Teal
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1997SABAPShapefile81 kb zip8 kb kmz
SABAP: 011 Shy Albatross
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 012 Black-browed Albatross
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 140 Martial Eagle
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1997SABAPShapefile82 kb zip10 kb kmz
SABAP: 153 Augur Buzzard
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 166 Montagu's Harrier
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 179 Red-footed Falcon
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1997SABAPShapefile81 kb zip4 kb kmz
SABAP: 189 Crested Francolin
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 203 Helmeted Guineafowl
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1997SABAPShapefile82 kb zip15 kb kmz
SABAP: 215 Baillon's Crake
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 230 Kori Bustard
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1997SABAPShapefile82 kb zip11 kb kmz
SABAP: 244 African Black Oystercatcher
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 255 Crowned Lapwing
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1997SABAPShapefile82 kb zip17 kb kmz
SABAP: 268 Common Redshank
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 287 Black-tailed Godwit
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 299 Burchell's Courser
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 309 Pomarine Jaeger
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 324 Swift Tern
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 344 Namaqua Sandgrouse
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1997SABAPShapefile83 kb zip16 kb kmz
SABAP: 355 Laughing Dove
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1997SABAPShapefile83 kb zip24 kb kmz
SABAP: 375 African Cuckoo
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 389 Coppery-tailed Coucal
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 003 African Penguin
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 410 Pennant-winged Nightjar
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 427 Narina Trogon
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 437 Striped Kingfisher
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1997SABAPShapefile80 kb zip4 kb kmz
SABAP: 449 Purple Roller
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1997SABAPShapefile82 kb zip13 kb kmz
SABAP: 460 Crowned Hornbill
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 476 Lesser Honeyguide
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1997SABAPShapefile80 kb zip3 kb kmz
SABAP: 495 Cape Clapper Lark
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1997SABAPShapefile81 kb zip4 kb kmz
SABAP: 522 Wire-tailed Swallow
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 533 Brown-throated Martin
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1997SABAPShapefile81 kb zip4 kb kmz
SABAP: 561 Black-faced Babbler
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 057 Bank Cormorant
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 614 Karoo Scrub-Robin
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1997SABAPShapefile80 kb zip4 kb kmz
SABAP: 630 Eurasian Reed-Warbler
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 662 Rockrunner
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1997SABAPShapefile80 kb zip3 kb kmz
SABAP: 681 Neddicky
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1997SABAPShapefile80 kb zip2 kb kmz
SABAP: 710 African Paradise-Flycatcher
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1997SABAPShapefile81 kb zip4 kb kmz
SABAP: 730 Rosy-throated Longclaw
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 756 Southern White-crowned Shrike
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1997SABAPShapefile81 kb zip9 kb kmz
SABAP: 076 Black-crowned Night-Heron
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1997SABAPShapefile81 kb zip3 kb kmz
SABAP: 007 Black-necked Grebe
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1997SABAPShapefile80 kb zip3 kb kmz
SABAP: 811 Village Weaver
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1997SABAPShapefile80 kb zip1 kb kmz
SABAP: 844 Blue Waxbill
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1997SABAPShapefile81 kb zip7 kb kmz
SABAP: 085 Abdim's Stork
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP: 089 Marabou Stork
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1997SABAPShapefile81 kb zip5 kb kmz
SABAP all: 411 Common swift to 887 Lark-like bunting
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1997SABAPShapefile8.18 mb zip1.56 mb kmz
Ludwig, D.E. 1976. Wiederfunde. Mitteilungen Ornithologische Arbeitsgruppe SWA Wissenschaftliche Gesellschaft, 12(4): 2
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1976Bibliography compiled by Bird Database ProjectJournal Article176 kb pdf
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Kolberg, H. 2016. Wetland bird counts in Namibia: a summary. Lanioturdus, 49(5): 2-191
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