How sunrise and weather affect timing of rooks (Corvus
frugilegus) morning departure from the winter communal roost.

J 2017

How sunrise and weather affect timing of rooks (Corvus frugilegus) morning departure from the winter communal roost.

HUBÁLEK, Zdeněk

Základní údaje

Originální název

How sunrise and weather affect timing of rooks (Corvus frugilegus) morning departure from the winter communal roost.

Název česky

Jak východ slunce a meteorologické proměnné ovlivňují časování ranního rozletu havranů (Corvus frugilegus) z hromadného zimního nocoviště. zimního

Autoři

HUBÁLEK, Zdeněk

Vydání

Folia Zoologica, Česká zemědělská univerzita v Praze, 2017, 0139-7893

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 0.467

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.25225/fozo.v66.i4.a3.2017

UT WoS

000447292200002

EID Scopus

2-s2.0-85044213406

Klíčová slova česky

havran, chronobiologie, zimní nocoviště, rozlet časování, slunce, počasí

Klíčová slova anglicky

rook, communal roosting, chronobiology, departure timing, sunrise, weather effects,

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 8. 4. 2020 14:57, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

The pattern of morning departure of rooks (Corvus frugilegus) from large communal roosts in winter is regular though it is affected by several environmental (weather) variables. A total of 151 records of the morning departure of rooks (and associated jackdaws, Corvus monedula) from two large communal roosts in the Czech Republic during the years 1966 to 1974 were analyzed. On average, the birds departed 36 min before local sunrise and 1.5 min after beginning of local civil twilight. Light intensity was the leading factor that explained 60 % of variability of the departure time. Cloud cover 30 min before sunrise, being interrelated with the light intensity at local sunrise, explained 52 % of the variability. Less important but significant factors were several weather variables such as precipitation, relative humidity of the air, horizontal visibility (fog), snow cover, and air temperature. Two best predictive multivariate regression models for timing of the birds' departure involved factors: light intensity (that accelerated the departure) or inter-related cloud cover before sunrise (it delayed the departure), precipitation (delaying the departure), snow cover (accelerating the departure due to increased food demand), and horizontal visibility (fog delayed the departure). The two predictive multivariate models explained together 75 % of variability of the birds' departure in relation to beginning of local civil twilight.

Citovat

HUBÁLEK, Zdeněk. How sunrise and weather affect timing of rooks (Corvus frugilegus) morning departure from the winter communal roost. Folia Zoologica. Česká zemědělská univerzita v Praze, 2017, roč. 66, č. 4, s. 227-230. ISSN 0139-7893. Dostupné z: https://dx.doi.org/10.25225/fozo.v66.i4.a3.2017.

@article{1413185,
   author = {Hubálek, Zdeněk},
   article_number = {4},
   doi = {http://dx.doi.org/10.25225/fozo.v66.i4.a3.2017},
   keywords = {rook, communal roosting, chronobiology, departure timing, sunrise, weather effects,},
   language = {eng},
   issn = {0139-7893},
   journal = {Folia Zoologica},
   note = {Žádný z autorů nemá afiliaci na MU.},
   title = {How sunrise and weather affect timing of rooks (Corvus frugilegus) morning departure from the winter communal roost.},
   volume = {66},
   year = {2017}
}

TY  - JOUR
ID  - 1413185
AU  - Hubálek, Zdeněk
PY  - 2017
TI  - How sunrise and weather affect timing of rooks (Corvus frugilegus) morning departure from the winter communal roost.
JF  - Folia Zoologica
VL  - 66
IS  - 4
SP  - 227-230
EP  - 227-230
PB  - Česká zemědělská univerzita v Praze
SN  - 01397893
N1  - Žádný z autorů nemá afiliaci na MU.
KW  - rook, communal roosting, chronobiology, departure timing, sunrise, weather effects,
N2  - The pattern of morning departure of rooks (Corvus frugilegus) from large communal roosts in winter is regular though it is affected by several environmental (weather) variables. A total of 151 records of the morning departure of rooks (and associated jackdaws, Corvus monedula) from two large communal roosts in the Czech Republic during the years 1966 to 1974 were analyzed. On average, the birds departed 36 min before local sunrise and 1.5 min after beginning of local civil twilight. Light intensity was the leading factor that explained 60 % of variability of the departure time. Cloud cover 30 min before sunrise, being interrelated with the light intensity at local sunrise, explained 52 % of the variability. Less important but significant factors were several weather variables such as precipitation, relative humidity of the air, horizontal visibility (fog), snow cover, and air temperature. Two best predictive multivariate regression models for timing of the birds' departure involved factors: light intensity (that accelerated the departure) or inter-related cloud cover before sunrise (it delayed the departure), precipitation (delaying the departure), snow cover (accelerating the departure due to increased food demand), and horizontal visibility (fog delayed the departure). The two predictive multivariate models explained together 75 % of variability of the birds' departure in relation to beginning of local civil twilight.
ER  -

HUBÁLEK, Zdeněk. How sunrise and weather affect timing of rooks (Corvus frugilegus) morning departure from the winter communal roost. \textit{Folia Zoologica}. Česká zemědělská univerzita v Praze, 2017, roč.~66, č.~4, s.~227-230. ISSN~0139-7893. Dostupné z: https://dx.doi.org/10.25225/fozo.v66.i4.a3.2017.

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