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You searched for: Subject term Circus Remove constraint Subject term: Circus Subject term agricultural land Remove constraint Subject term: agricultural land Subject term breeding Remove constraint Subject term: breeding
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1. Impacts of birds of prey on gamebirds in the UK: a review

Author:
PARK, KIRSTY J.; GRAHAM, KATE E.; CALLADINE, JOHN; WERNHAM, CHRIS W.
Source:
Ibis 2008 v.150 no.s1 pp. 9-26
ISSN:
0019-1019
Subject:
Accipiter; Circus; Falco peregrinus; Lagopus lagopus scoticus; Perdix perdix; agricultural land; bags; birds of prey; breeding; ecologists; economic impact; employment; game birds; heathlands; humans; income; managers; mortality; partridges; predation; recreation; wildlife; England; Scotland
Abstract:
... The influence of predators on the distribution, density and dynamics of their prey species has long been of interest to ecologists and wildlife managers. Where the prey population is also utilized by humans, conflicts may arise through competition for a limited resource. Because gamebird shooting in the UK provides employment, recreation and income, the impact of birds of prey on gamebird populati ...
DOI:
10.1111/j.1474-919X.2008.00847.x

2. Breeding biology of the Montagu’s Harrier (Circus pygargus) in east-central Poland and implications for its conservation

Author:
Dominik Krupiński; Jerzy Lewtak; Mirosław Rzępała; Krzysztof Szulak
Source:
Zoology and ecology 2012 v.22 no.2 pp. 86-92
ISSN:
2165-8013
Subject:
Circus; agricultural land; birds; breeding; clutch size; correlation; crops; eggs; farming systems; gender differences; harvest date; nesting; nests; sex ratio; weather; Poland
Abstract:
... In 2005–2011 active conservation and study on the population of the Montagu’s Harrier was conducted in the farmland areas of east-central Poland. The population was estimated at 240–270 breeding pairs and its size was stable. The mean clutch size was estimated at 3.71 eggs per breeding pair. The number of fledglings was 1.24 per nest and 2.6 per successful breeding pair. There were no significant ...
DOI:
10.1080/21658005.2012.699744

3. Feeding behaviour and diet composition of Marsh Harriers Circus aeruginosus in agricultural landscapes

Author:
Laura Cardador; Enric Planas; Anna Varea; Santi Mañosa
Source:
Bird study 2012 v.59 no.2 pp. 228-235
ISSN:
1944-6705
Subject:
Circus; agricultural land; birds; breeding; breeding season; diet; energy requirements; foraging; irrigation; nests; small mammals; Iberian Peninsula
Abstract:
... Capsule Diet composition and feeding behaviour of breeding birds differed between areas of high and low agricultural intensification. Aims To analyze diet composition and feeding behaviour of Marsh Harriers Circus aeruginosus in agricultural landscapes with different degrees of agricultural intensification. Methods Diet composition and feeding behaviour was assessed by focal observations at nests ...
DOI:
10.1080/00063657.2011.648165

4. Annual and seasonal patterns in wildlife road-kill and their relationship with traffic density

Author:
Richard MFS Sadleir; Wayne L Linklater
Source:
New Zealand journal of zoology 2016 v.43 no.3 pp. 275-291
ISSN:
1175-8821
Subject:
Circus; Erinaceidae; Oryctolagus cuniculus; Trichosurus vulpecula; agricultural land; birds; breeding; habitats; periodicity; pest control; possums; rabbits; road kills; roads; seasonal variation; swamps; traffic; wildlife; wildlife management
Abstract:
... Hedgehogs (Erinaceous europaeus), rabbits (Oryctolagus cuniculus) and possums (Trichosurus vulpecula) were 93.4% of 1390 mammal carcasses counted during 92 trips along a 63.2 km route, 2009–2014, through peri-urban and farmland habitats. Pukeko (Porphyrio melanotus) and swamp harriers (Circus approximans) constituted 29% of the 466 bird road-kill. Comparisons indicate the recovery of hedgehog and ...
DOI:
10.1080/03014223.2016.1155465

5. Breeding phenology and nest survival of Cinereous (Circus cinereus) and Long-winged (C. buffoni) Harriers in the agricultural landscapes of north-east Patagonia, Argentina

Author:
Luciano N. Segura; María S. Bó
Source:
Emu 2018 v.118 no.2 pp. 218-223
ISSN:
1448-5540
Subject:
Circus; agricultural land; breeding; grasslands; habitats; nesting; nests; phenology; population dynamics; survival rate; Argentina
Abstract:
... We present novel data on breeding ecology and nest survival of the Cinereous (Circus cinereus) and Long-winged (C. buffoni) Harriers in modified grasslands of southern Argentina and we evaluate variations in daily nest survival rates (DSR) in relation to temporal and habitat variables. We studied three mixed nesting colonies embedded in agricultural landscapes along a road. We found that DSR decre ...
DOI:
10.1080/01584197.2017.1404431