Shiny Cowbird (Molothrus bonariensis) Science Article 6 abstract Recent human settlement in Brasilia, Central Brazil, has greatly reduced the extent of native cerrado vegetation. This has favored the Shiny Cowbird, Molothrus bonariensis,which is common in farmland and certain urban sites. Between September and December of 1982 to 1984, we observed cowbird nestlings(n) or fledglings(f) attended […]
THE SHINY COWBIRD (MOLOTHRUS BONARIENSIS) IN CHILE:INTRODUCTION OR DISPERSION? ITS HOSTS AND PARASITICTRENDS
Shiny Cowbird (Molothrus bonariensis) Science Article 4 abstract I analyzed the origin, distribution, and hosts of the Shiny Cowbird (Molothrus bonairensis) in Chile, using specimen records and the literature. It is more likely that the species was introduced to Chile before natural dispersal could take place from Argentina. The earliest specimens are from mid-1865 and […]
THE RUFOUS-COLLARED SPARROW AS A HOST OF THE SHINY COWBIRD
Shiny Cowbird (Molothrus bonariensis) Science Article 5 abstract The Rufous-collared Sparrow or Chingolo (Zonotrichia cupensis) is one of the main hosts of the Shiny Cowbird (Molothrus bonariensis) through most of their overlapping range in South America. The most recent study on the interaction between these species was carried out by King (1973) in Horco Molle, […]
Timing of moult in male and female Shelducks Tadorna tadorna: Effects of androgens and mates
Shelduck (Tadorna tadorna) Science Article 2 abstract We investigated effects of testosterone treatment on timing and rate of moult of wing-feathers in male Shelducks Tadorna tadorna, and whether this treatment influences the timing of moult in untreated females. Three experimental treatments were conducted, each with two groups of sexual inactive male Shelducks, which were kept […]
Aktivitatsrhythmus von Brandgansen (Tadorna tadorna) und Watvogeln (Charadrii) an der Nordseekiiste
Shelduck (Tadorna tadorna) Science Article 1 abstract Shelducks, Oystercatchers, Grey Plovers, Knots, Dunlins, Bar-tailed Godwits, Curlews, Spotted Redshanks, Redshanks, and Greenshanks showed a tidal rhythm of time-activity budgets on the Wadden Sea coast during the non-breeding season. Ringed Plovers and Ruffs did not react to the tidal rhythm. Night-time feeding could be observed in most […]
Are foraging Serin Serinus serinus females more vigilant than males? The effect of sex ratio.
Serin (Serinus serinus) Science Article 2 abstract Given that in many bird species females are subordinate to males and that, in general, subordinate individuals are more vigilant than dominants ones, we should predict foraging females to be more vigilant than males. This prediction is tested here in flocks of Serins Serinus serinus, where several males […]
Prevalence of louse-flies Diptera, Hippoboscidae parasitizing a cardueline finch and its effect on body condition.
Serin (Serinus serinus) Science Article 1 abstract Prevalence of louse-flies Diptera, Hippoboscidae parasitizing a cardueline finch and its effect on body condition. Senar J.C., Copete J.L., Domenech J. & Von Walter G., ARDEA 82 (1): 157-160. Download article download full text (pdf)
Nest and nest-site reuse within and between breedingseasons by three neotropical flycatchers (Tyrannidae)
Sepia-capped Flycatcher (Leptopogon amaurocephalus) Science Article 1 abstract Nest and/or nest site reuse within and between breeding seasons was reported by the Euler’s Flycatcher (Lathrotriccus euleri), the Sepia-capped Flycatcher (Leptopogon amaurocephalus) and the Gray-hooded Flycatcher (Mionectes rufiventris)in forest fragments from southeastern Brazil. Nest and/or nest site reuse between some years was frequent within a single […]
Atypical Nest Site of a Semipalmated Plover
Semipalmated Plover (Charadrius semipalmatus) Science Article 1 abstract We report on an unusual nest site ofa Semipalmated Plover (Charadrius semipalmatus) atLa Pe
Influence of Arctic Terns on Survival of Artificialand Natural Semipalmated Plover Nests
Semipalmated Plover (Charadrius semipalmatus) Science Article 2 abstract Survival of Semipalmated Plover (Charadrius semipalmatus) nests was compared in areas with andwithout nesting Arctic Terns (Sterna paradisaea) to determine whether the protection provided to plovers by associationwith this colonial species is passive or aggressive. Artificial and natural nests placed=100 m from terns hadsimilar rates of survival […]