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001-es BibID:BIBFORM082214
Első szerző:Dos Remedios, Natalie
Cím:Ontogenic differences in sexual size dimorphism across four plover populations / Natalie Dos Remedios, Tamás Székely, Clemens Küpper, Patricia L. M. Lee, András Kosztolányi
Megjegyzések:Sexual size dimorphism (SSD) among adults is commonly observed in animals and isconsidered to be adaptive. However, the ontogenic emergence of SSD, i.e. the timing ofdivergence in body size between males and females, has only recently received attention.It is widely acknowledged that the ontogeny of SSD may differ between species, but itremains unclear how variable the ontogeny of SSD is within species. Kentish PloversCharadrius alexandrinusand Snowy PloversC. nivosusare closely related wader speciesthat exhibit similar, moderate (c. 4%), male-biased adult SSD. To assess when SSDemerges we recorded tarsus length variation among 759 offspring in four populations ofthese species. Tarsus length of chicks was measured on the day of hatching and up tothree times on recapture beforefledging. In one population (Mexico, Snowy Plovers),males and females differed in size from the day of hatching, whereas growth rates dif-fered between the sexes in two populations (Turkey and United Arab Emirates, bothKentish Plovers). In contrast, a fourth population (Cape Verde, Kentish Plovers) showedno significant SSD in juveniles. Our results suggest that adult SSD can emerge at differ-ent stages of development (prenatal, postnatal and post-juvenile) in different populationsof the same species. We discuss the proximate mechanisms that may underlie thesedevelopmental differences.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
sexual size dimorphism
Megjelenés:Ibis. - 157 : 3 (2015), p. 590-600. -
További szerzők:Székely Tamás (1959-) (biológus) Küpper, Clemens Lee, Patricia L. M. Kosztolányi András (1971-) (biológus)
Pályázati támogatás:OTKA K81953
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat


001-es BibID:BIBFORM063043
Első szerző:Fülöp Attila (biológus)
Cím:Feather-degrading bacteria, uropygial gland size and feather quality in House Sparrows Passer domesticus / Attila Fülöp, Gábor A. Czirják, Peter L. Pap, Csongor I. Vágási
ISSN:0019-1019 1474-919X
Megjegyzések:Feathers are dead integumentary structures that are prone to damage and thus showgradual degradation over the course of a year. This loss of quality might have negativefitness consequences. Feather-degrading bacteria are some of the most prevalent feather-degrading organisms, yet the relationship between feather-degrading bacteria load andflight feather quality has rarely been assessed. We studied this relationship in free-livingHouse Sparrows during breeding and non-breeding annual lifecycle stages. We also con-sidered the size of the uropygial gland, given the antimicrobial function of its secretions,and the effect of body condition. The number of feather holes was positively associatedwith feather-degrading bacteria load and was negatively related to uropygial gland sizeand body condition during the breeding season in both sexes. In the non-breeding seasonwe found the same relationships, but only in females. The degree of feather wear wasunrelated to any of the variables measured during the breeding season, whereas it wasnegatively associated with uropygial gland size and positively with feather-degrading bac-teria load in the non-breeding season, but only in females. Our results suggest thatfeather-degrading bacteria may induce the formation of feather holes, but play only aminor role in the abrasion of flight feathers.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
feather hole
feather wear
feather structure
keratinolytic microorganisms
preen oil
Élettudományok - Biológiai tudományok
Megjelenés:IBIS : the international journal of avian science. - 158 : 2 (2016), p. 362-370. -
További szerzők:Czirják Gábor Á. Pap Péter László (ökológus) Vágási Csongor István
Pályázati támogatás:OTKA_K112527
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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