Corn Crake (Crex crex) Science Article 5 abstract The corncrake Crex crex is among 1,186 bird species (about 10% of all species) recently assessed as being globally threatened. Corncrake population declines are well documented in western Europe, but until recently little was known about populations and trends elsewhere in Europe and Asia. In the last […]
Monitoring Corncrake Crex crex numbers inEuropean Russia: the first stage
Corn Crake (Crex crex) Science Article 10 abstract The Corncrake is a widespread and common species in Russia. Because agricultural conditionsin Russia are unstable, it is important to establish the Corncrake’s current populationdynamics through studies in pilot areas. Two types of repeated censuses have been carriedout:1. In 1994, there were censuses on pilot plots in […]
Estimating the age of Corncrake Crex crex chicks from body weight and the development of primary
Corn Crake (Crex crex) Science Article 2 abstract Two methods for ageing Corncrake Crex crex chicks are described. Data on the body weight of chicks of known age, from broods of radio-tagged females, were used to produce a formula for determining the age of chicks of unknown age. This method was, however, prone to error […]
Age-dependent changes in the shape of the secondary remiges of individual adult Corncrakes Crex crex
Corn Crake (Crex crex) Science Article 1 abstract A comparison of Corncrakes Crex crex of known age showed that the tips of the secondary remiges were, on average, more pointed for birds with remiges grown in the hatching year (HY) than for older adults with remiges grown after the hatching year (AHY; Green et al […]
Fluctuations related to rainfall in richness and abundance of birds of steppic Mediterranean habitats
Corn Bunting (Emberiza calandra) Science Article 5 abstract The existence of interannual variations in the richness and abundance of bird species breeding in pseudo-steppic Mediterranean areas is analysed and related to the important fluctuations that take place in rainfall, which in turn deeply influence vegetation growth. The hypothesis of food limitation as a key factor […]
De Grauwe Gors Miliaria calandra: recente aantalsontwikkeling, habitatkeus en perspectieven in relatie tot het beheer van uiterwaarden en akkerland
Corn Bunting (Emberiza calandra) Science Article 2 abstract De Grauwe Gors dreigt uit Nederland te verdwijnen. Ook in de laatste bolwerken in Limburg en de uiterwaarden van de Waal ziet de situatie er voor deze karakteristieke soort niet rooskleurig uit. Een nauwkeurige blik op de lokale aantalontwikkelingen en veranderingen in de beschikbare broed- en winterhabitat […]
Sexing Corn Buntings Miliaria calandra by discriminant function: a comment
Corn Bunting (Emberiza calandra) Science Article 3 abstract A recent paper on sexing Corn Buntings Miliaria calandra by discriminant function (Campos et al 2005) quotes wing lengths exceeding 100 mm for five of 51 females sexed by molecular methods. The occurrence of wings this long is noted by the authors as unusual, whereas they are […]
Sex differentiation of Corn Buntings Miliaria calandra wintering in northern Spain
Corn Bunting (Emberiza calandra) Science Article 1 abstract A discriminant function was developed for sex differentiation of Corn Buntings Miliaria calandra wintering in northern Spain. The function, y = 0.136A + 0.288W-26.837, where A is wing length in mm and W is body weight in g, gives positive values for males and negative values for […]
Sexing Corn Buntings Miliaria calandra by discriminant function: a reply
Corn Bunting (Emberiza calandra) Science Article 4 abstract Although, as Morgan (2006) points out, we cannot reject a systematic observer-associated error of 10 mm, we suggest that the existence of some female Corn Buntings (n = 5) with longer wing lengths than described in literature (Cramp & Perrins 1994) and the lack of a normal […]
Nesting and reproductive characteristics of Coots
Coot (Fulica atra) Science Article 1 abstract Variation in dimension of nests (external diameter, cup diameter and height), water depth at nesting sites, clutch sizes, egg sizes and hatching success was studied in Coots Fulica atra nesting on two lakes in Algeria in 1996-1997. The main idea of this paper is to provide basic data […]