Migratory behaviour and survival of Great Egrets after range expansion in Central Europe

©2020 Włodarczyk et al..

Great Egret Ardea alba is one of few Western Palearctic species that underwent a rapid range expansion in the recent decades. Originally breeding in central and eastern Europe, the species has spread in northern (up to the Baltic coast) and western (up to the western France) directions and established viable breeding populations throughout almost entire continent. We monitored one of the first Great Egrets colonies established in Poland to infer migratory patterns and survival rates directly after range expansion. For this purpose, we collected resightings from over 200 Great Egret chicks marked between 2002-2017 in central Poland. Direction of migration was non-random, as birds moved almost exclusively into the western direction. Wintering grounds were located mainly in the western Europe (Germany to France) within 800-950 km from the breeding colony. First-year birds migrated farther than adults. We found some, although relatively weak, support for age-dependent survival of Great Egrets and under the best-fitted capture-recapture model, the estimated annual survival rate of adults was nearly twice higher than for first-year birds (φ ad  = 0.85 ± 0.05 vs. φ fy  = 0.48 ± 0.15). Annual survival rate under the constant model (no age-related variation) was estimated at φ = 0.81 ± 0.05. Our results suggest that Great Egrets rapidly adapted to novel ecological and environmental conditions during range expansion. We suggest that high survival rate of birds from central Poland and their western direction of migration may facilitate further colonization processes in western Europe.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:8

Enthalten in:

PeerJ - 8(2020) vom: 01., Seite e9002

Sprache:

Englisch

Beteiligte Personen:

Włodarczyk, Radosław [VerfasserIn]
Szafara, Daria [VerfasserIn]
Kaczmarek, Krzysztof [VerfasserIn]
Janiszewski, Tomasz [VerfasserIn]
Minias, Piotr [VerfasserIn]

Links:

Volltext

Themen:

Great Egret
Journal Article
Migratory behaviour
Range expansion
Survival

Anmerkungen:

Date Revised 28.09.2020

published: Electronic-eCollection

Citation Status PubMed-not-MEDLINE

doi:

10.7717/peerj.9002

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM309743877