Sky Lark (Alauda arvensis) Science Article 6 abstract To describe the variation in laying date, clutch size, egg volume and hatching asynchrony of four lark species (Skylark Alauda arvensis, Short-toed Lark Calandrella brachydactyla, Thekla Lark Galerida theklae and Lesser Short-toed Lark Calandrella rufescens) and at two different time scales: between years (large-scale variation), and within […]
Category: Passeriformes
Abundance of Four Lark Species in Relationto Portuguese Farming Systems
Sky Lark (Alauda arvensis) Science Article 2 abstract Throughout much of Europe, farmland birds have declined more than those of other habitats, because of the abandonment of traditional farming systems and the simplification of remaining agricultural systems, including increased use of external inputs (Tucker & Heath 1994, Baldock 1991, Bignal & McCracken 1996). Traditional low-input […]
Sustainable Arable Farming For an Improved Environment (SAFFIE): managing winter wheat sward structure for Skylarks Alauda arvensis
Sky Lark (Alauda arvensis) Science Article 5 abstract Research has shown a close correlation between the decline of the UK Skylark Alauda arvensis population and the replacement of spring-sown cereals with winter-sown varieties, in which advanced sward development prevents successful multiple nesting attempts and reduces access for foraging. Widescale reversal of sowing times is unlikely […]
Nesting behavior of the Slate-colored Seedeater (Sporophila schistacea) in Panama
Slate-coloured Seedeater (Sporophila schistacea) Science Article 2 abstract The nesting behavior of the Slate-colored Seedeater (Sporophila schistacea) is virtually unknown, and few nests have been described previously (Wetmore et al. 1984, Hilty & Brown 1986). This species is highly nomadic and tends to breed I in areas with large seed crops, particularly bamboo (Willis & […]
The Slate-colored Seedeater (Sporophila schistacea): a bamboo specialist?
Slate-coloured Seedeater (Sporophila schistacea) Science Article 1 abstract The idea of constant density and stable territoriality found in some tropical birds (Greenberg & Gradwohl1986) does not lend itse1f to species that rely on a short-term, unpredictable resource. One such resource is mast-seeding plants. Mast seeding is the synchronized production of seed at long intervals by […]
The impact of grazing animals on nesting success of grassland passerines in farmland and natural habitats: a field experiment
Sky Lark (Alauda arvensis) Science Article 4 abstract A study was made of the influence of trampling by grazing animals on the nesting success of real nests (meadow pipit, Anthus pratensis; water pipit, Anthus spinoletta; and skylark, Alauda arvensis) and simulated nests (caps from jam-jars filled by green plasticine) on pasture in the Orlicke Mountains […]
Do habitat association models have any generality? Predictingskylark Alauda arensis abundance in different regions of southernEngland
Sky Lark (Alauda arvensis) Science Article 3 abstract Much of conservation science is based upon determining the use by organisms ofdifferent resources. However, the field data used to construct habitat associationmodels generally come from a small number of sites covering a fraction of the areaof interest. It is important therefore to assess the generality of […]
Parental nepotism enhances survival of retained offspring in the Siberian jay
Siberian Jay (Perisoreus infaustus) Science Article 1 abstract The evolutionary payoff accruing to parents from breeding offspring could be an incentive for prolonged investments in the offspring. Enhanced survival for offspring as a result of such a prolonged parental investment would increase the value of remaining in the natal territory for the offspring. Here we […]
Behaviour and life-history responses to chick provisioning under risk of nest predation.
Siberian Jay (Perisoreus infaustus) Science Article 2 abstract This thesis examines risk management in breeding Siberian jays (Perisoreusinfaustus), which is indigenous to the northern taiga. Parent behaviour and the nestare cryptic. A new nest is built each year. It is placed on spruce or pine branches closeto the trunk and well insulated with lichens, feathers […]
THE NESTING OF SOME VENEZUELAN BIRDS
Silver-beaked Tanager (Ramphocelus carbo) Science Article 1 abstract I passed the interval from 15 March to 24 July 1966 at ‘La Araguata,’ a large cattle farmsituated among the hills near Pirapira, some 20 miles south of Valencia in the state ofCarabobo, Venezuela. Although most of my time was devoted to the study of the RufousfrontedThornbird […]