Search results for "FICEDULA"
showing 4 items of 54 documents
Data from: Carry-over effects of conditions at the wintering grounds on breeding plumage signals in a migratory bird: roles of phenotypic plasticity …
2016
To understand the consequences of ever-changing environment on the dynamics of phenotypic traits, distinguishing between selection processes and individual plasticity is crucial. We examined individual consistency/plasticity in several male secondary sexual traits expressed during the breeding season (white wing and forehead patch size, UV reflectance of white wing patch and dorsal melanin colouration) in a migratory pied flycatcher (Ficedula hypoleuca) population over an 11-year period. Furthermore, we studied carry-over effects of three environmental variables (NAO, a climatic index; NDVI, a vegetation index; and rainfall) at the wintering grounds (during pre-breeding moult) on the expres…
The effects of experimentally manipulated yolk androgens on growth and immune function of male and female nestling collared flycatchers Ficedula albi…
2009
Hormone-mediated maternal effects may be an important mechanism for adjusting offspring phenotype to particular requirements of the environment. We manipulated the levels of testosterone and androstenedione in the yolk of collared flycatcher Ficedula albicollis eggs to investigate the effects of pre-natal exposure to androgens on growth and immune function. Androgen treatment tended to reduce the growth of males, and enhance the growth of females, as indicated by significant interaction between sex and androgen treatment. Cellular immune function was not affected by androgen treatment or sex. Survival of nestlings until fledging was not related to androgen treatment. Our results indicate th…
Saalistusriskin vaikutus lintujen pesäpaikan valintaan ja pesimämenestykseen
2007
Melnā mušķērāja Ficedula hypoleuca un lielās zīlītes Parus major ligzdošanas vietu izvēli noteicošie faktori mežos ar mākslīgajām ligzdvietām
2022
Līdz šim veiktajos, publiski pieejamos pētījumos secināts, ka lielā zīlīte Parus major labprātāk izvēlas ligzdot lapu koku nevis skujkoku audzēs. Tikmēr melnā mušķērāja Ficedula hypoleuca sastopamība atkarīga no mākslīgo ligzdvietu izvietojuma daudzuma. Pamatojoties uz šo informāciju, tika izvirzīts pieņēmums, ka lielās zīlītes ligzdvietas izvēlē būtiska ietekme ir apkārt esošajai veģetācijai, bet melnā mušķērāja izvēlē – mākslīgo ligzdvietu skaitam. Par darba mērķi tika uzstādīts noskaidrot lielās zīlītes un melnā mušķērāja ligzdošanas vietu izvēli noteicošos faktorus mežos ar mākslīgajām ligzdvietām. Pētījuma veikšanai izvēlēti divi pētījuma apvidi, kuros izvietotas mākslīgās ligzdvietas.…