Search results for "Parus major"
showing 3 items of 23 documents
Data from: The role of partial incubation and egg repositioning within the clutch in hatching asynchrony and subsequent effects on breeding success
2019
The main mechanism to achieve hatching asynchrony (HA) for incubating birds is to start heating the eggs before clutch completion. This might be achieved through partial incubation and/or early incubation. Even in the absence of incubation behaviour during the laying phase, clutches still experience a certain degree of asynchrony. Recent studies have shown that eggs located in the centre of the nest receive more heat than peripheral ones during incubation. Since eggs receiving more heat would develop faster, we hypothesised that HA should be shorter in nests where eggs were moved homogeneously along the centre-periphery space during incubation compared to those nests where eggs repeatedly r…
No evidence for associations between brood size, gut microbiome diversity and survival in great tit (Parus major) nestlings
2022
Abstract Background The gut microbiome forms at an early stage, yet data on the environmental factors influencing the development of wild avian microbiomes is limited. As the gut microbiome is a vital part of organismal health, it is important to understand how it may connect to host performance. The early studies with wild gut microbiome have shown that the rearing environment may be of importance in gut microbiome formation, yet the results vary across taxa, and the effects of specific environmental factors have not been characterized. Here, wild great tit (Parus major) broods were manipulated to either reduce or enlarge the original brood soon after hatching. We investigated if brood siz…
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.…