Habitat‐specific survival of golden‐winged warblers Vermivora chrysoptera during the non‐breeding season in an agricultural landscape

2021 ◽  
Author(s):  
Jeffrey D. Ritterson ◽  
David I. King ◽  
Richard B. Chandler
Keyword(s):  
Breeding Season ◽  
Agricultural Landscape ◽  
Vermivora Chrysoptera

The spatial dynamics of White-browed Babbler groups in a fragmented agricultural landscape

2002 ◽  
Vol 8 (4) ◽  
pp. 271 ◽  
Author(s):  
Peter G. Cale
Keyword(s):  
Home Range ◽  
Breeding Season ◽  
Group Dynamics ◽  
Agricultural Landscape ◽  
Local Population ◽  
Breeding Site ◽  
Home Ranges ◽  
Effective Population ◽  
Study Sites ◽  
Group Movements

White-browed Babbler Pomatostomus superciliosus groups occupying linear strips of vegetation had breeding territories that were smaller in area and had longer linear dimensions than those occupying patches. A group's non-breeding home range was larger than its breeding territory. Groups occupying linear/patch home ranges expanded the linear extent and area of their home ranges more than those within other home range configurations. Some groups moved during the non-breeding season and this was more likely to occur if the group occupied a remnant with a low abundance of invertebrates during summer. Some groups that moved returned prior to the next breeding season, but the majority were never seen again. New groups moved into the study sites and established in vacant home ranges. This suggests that those groups that left the study sites may have established new home ranges elsewhere. Breeding site fidelity was lower in groups that had failed in previous breeding attempts. Therefore, group movements were influenced by the feeding and breeding quality of the habitat. However, the configuration of the local population also influenced group movements with those groups on the edge of a local population being more likely to move than those in the interior. New groups were formed by two processes; group dispersal, where groups generally filled a vacant home range, and group budding, which involved the splitting of a large group. Group dispersal maintained group densities while group budding increased the density of groups in a local population. These two processes were common, producing localized fluctuations in the density of groups. Since babbler groups contain only one breeding pair, changes in group density represent changes in effective population size. Therefore, group dynamics may be important to the persistence of local populations of White-browed Babblers, especially in landscapes that have suffered from habitat loss and fragmentation.

scholarly journals Abundance of raptors and habitat preferences of the common buzzard Buteo buteo and the common kestrel Falco tinnunculus during the non-breeding season in an agricultural landscape (Western Slovakia)

2014 ◽  
Vol 7 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Vladimír Nemček
Keyword(s):  
Breeding Season ◽  
Human Activities ◽  
Agricultural Landscape ◽  
Agricultural Land ◽  
Habitat Preferences ◽  
Falco Tinnunculus ◽  
Common Buzzard ◽  
Buteo Buteo ◽  
The Common ◽  
Breeding Seasons

Abstract Habitat use and preferences by raptors were studied during three non-breeding seasons (2011-201 3) in an agricultural landscape in western Slovakia. The non-breeding season on agricultural land showed high variation and changes in the cover of habitats related to human activities. The most abundant raptor species were the common buzzard Buteo buteo (L.) (1 52 individuals) and the common kestrel Falco tinnunculus (L.) (78 individuals). The common buzzard preferred alfalfa and avoided ploughed fields. The common kestrel showed a high habitat preference for alfalfa, corn fields, stubbles and fallow. It also avoided ploughed fields and wheat.

Landscape structure, predation of red foxes on grey partridges, and their spatial relations

2013 ◽  
Vol 8 (11) ◽  
pp. 1119-1126
Author(s):  
Marek Panek
Keyword(s):  
Breeding Season ◽  
Landscape Structure ◽  
Vulpes Vulpes ◽  
Agricultural Landscape ◽  
Spatial Relations ◽  
Predation Rate ◽  
Structural Elements ◽  
Nesting Habitat ◽  
Red Foxes ◽  
Small Fields

AbstractThe aim of this study was to estimate the effect of agricultural landscape structure on the predation rate of red foxes Vulpes vulpes on grey partridges Perdix perdix during the breeding season and on their spatial relations. The number of partridge remains found around fox breeding dens (N=165) was used as an index of the predation rate in 10 study areas. Moreover, the distribution of both species and the searching intensity of partridge nesting habitat (permanent semi-natural vegetation) by foxes in relation to the landscape structure were studied using scat, track and call counts. The predation index (range 0.06–0.46 partridges/den) increased with spring partridge density and decreased with the occurrence of crop boundaries. The distribution of foxes and partridges in large fields was positively correlated with the occurrence of permanent vegetation, but no such effect was observed in small fields. The searching intensity in permanent vegetation by foxes decreased with the occurrence of these structures among small fields, but not among large fields. The study showed that in a differentiated landscape foxes and partridges had various structural elements at their disposal, which led to partial separation of the predator and its prey in the space.

Terrestrial movements of the natterjack toad Bufo calamita (Amphibia, Anura) in a semi-arid, agricultural landscape

2000 ◽  
Vol 21 (3) ◽  
pp. 357-369 ◽  
Author(s):  
Delfi Sanuy ◽  
Jean-Noël Avrillier ◽  
Claude Miaud
Keyword(s):  
Breeding Season ◽  
Site Fidelity ◽  
Agricultural Landscape ◽  
Maximum Distance ◽  
Breeding Sites ◽  
Bufo Calamita ◽  
Males And Females ◽  
Toad Bufo ◽  
Semi Arid ◽  
Ne Spain

AbstractThe movements of 19 natterjack toads (Bufo calamita) were monitored by telemetry in a semi-arid agricultural landscape in NE Spain. Toads reproduced in two water pools in fields of barley and an ancient clayquarrying zone filled by rainfall. Thirteen toads were followed during the breeding season (weeks 5-17 of 1997) and 11 toads were followed after reproduction (weeks 18 to 46). During the breeding season four toads moved distances of up to 500 m between breeding sites. No significant differences in movement patterns were found between the sexes, but a tendency was observed for males to show higher terrestrial site fidelity than females. Distances moved after the breeding season were substantial. The distance between the furthest positions recorded was from 164 to 1201 m, the maximum distance observed between daily recordings ranged from 125 to 353 m and the maximum overall distances ranged from 567 to 4411 m. No significant differences were observed between males and females or between small and large toads. The movements of these toads in a semi-arid agricultural landscape in Spain are compared with those observed in England and Germany.

scholarly journals Environmental Correlates of Nesting Success in Red-Shouldered Hawks

The Condor ◽  
2007 ◽  
Vol 109 (3) ◽  
pp. 648-657
Author(s):  
Joan L. Morrison ◽  
Michael McMILLIAN ◽  
Jonathan B. Cohen ◽  
Daniel H. Catlin
Keyword(s):  
Breeding Season ◽  
Agricultural Landscape ◽  
Nesting Success ◽  
Linear Modeling ◽  
Information Theoretic ◽  
Central Florida ◽  
South Central ◽  
Rainfall Frequency ◽  
Lower Productivity ◽  
Forested Landscapes

Abstract Abstract. We evaluated the influence of weather on reproduction of the Red-shouldered Hawk (Buteo lineatus) in an agricultural landscape in south-central Florida where we found relatively high densities of successfully nesting hawks. We used a generalized linear modeling approach within an information-theoretic framework to examine the influence of total rainfall, rainfall frequency, and temperature on the timing of nesting, nesting success, and productivity of hawks during 1995–2000. The best models indicated an influence of rainfall frequency and laying period on hawk reproduction. During years with less frequent rainfall in the summer and fall months prior to the beginning of the breeding season, fewer pairs attempted to nest, and hawks nested later and had smaller clutch sizes and lower productivity. Hawks that nested later in the breeding season had lower hatching success and lower overall nest success. Although Red-shouldered Hawks are generally reported to inhabit forested landscapes throughout their range, a common feature seems to be a dependence on wetlands and riparian habitat for foraging. We propose that the proportion of wetlands throughout the landscape is a unique aspect of south-central Florida that may allow for persistence of unusually high numbers of hawks.

Observation on the breeding biology of Polypedates teraiensis (Dubois, 1987) (Amphibia: Rhacophoridae)

2017 ◽  
Vol 17 (1) ◽  
pp. 25-32
Author(s):  
Jacinta Lalchhanhimi ◽  
Lalremsanga H.T.
Keyword(s):  
Sexual Dimorphism ◽  
Breeding Season ◽  
Sound Production ◽  
Reproductive Function ◽  
Breeding Biology ◽  
Tree Frog ◽  
University Campus ◽  
Morphometric Measurements ◽  
Advertisement Calls ◽  
Males And Females

The breeding biology of tree frog, Polypedates teraiensis was studied during the breeding season at Mizoram University Campus. It was found that sound production by male during the breeding season was primarily a reproductive function and advertisement calls attract females to the breeding areas and announce other males that a given territory is occupied. The aim of this study was to provide the detailed information on the breeding behaviour and the advertisement calls of Polypedates teraiensis. The morphometric measurements of the amplecting pairs (males and females) for sexual dimorphism along with clutch sizes were also studied.

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