Across a migratory divide: divergent migration directions and non-breeding grounds of Eurasian reed warblers revealed by geolocators and stable isotopes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10391219" target="_blank" >RIV/00216208:11310/18:10391219 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68081766:_____/18:00489667

Výsledek na webu

<a href="https://doi.org/10.1111/jav.01769" target="_blank" >https://doi.org/10.1111/jav.01769</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/jav.01769" target="_blank" >10.1111/jav.01769</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Across a migratory divide: divergent migration directions and non-breeding grounds of Eurasian reed warblers revealed by geolocators and stable isotopes

Popis výsledku v původním jazyce

Migratory divides represent narrow zones of overlap between parapatric populations with distinct migration directions and, consequently, expected divergent non-breeding distributions. The composition of the mixed population at a migratory divide and the corresponding non-breeding ranges remain, however, unknown for many Palaearctic-African migrants. Here, we used light-level geolocation to track migration direction and non-breeding grounds of Eurasian reed warblers Acrocephalus scirpaceus from three breeding populations across the species&apos; migratory divide. Moreover, by using feathers grown at non-breeding grounds, we quantified stable isotope composition for individuals with known southwestern (SW) and southeastern (SE) migration directions. On a larger sample per population, we then assessed the proportions of SW- and SE-migrating phenotypes in each of the three populations. All tracked reed warblers from Germany and two thirds of the birds tagged from the Czech population headed initially SW. Nevertheless, about one third of the birds from the Czech site migrated towards SE. No tracking data have been obtained for the Bulgarian population. The initial migration direction determined by geolocators was a strong predictor of the non-breeding region, with SW migrants staying in west Africa and SE migrants in central Africa. Feather delta S-34 and delta N-15 values confirmed the predominance of SW migrants in the German population, the co-occurrence of SW and SE migrants in the Czech population, and indicated a high (72%) proportion of SE migrants in the Bulgarian population. Thus, the combined approach of geolocator tracking and stable isotopic assignments provided clear evidence for the existence of a migratory divide in the southeast of central Europe and predicted non-breeding range in central and central-eastern Africa for the eastern population.

Název v anglickém jazyce

Across a migratory divide: divergent migration directions and non-breeding grounds of Eurasian reed warblers revealed by geolocators and stable isotopes

Popis výsledku anglicky

Migratory divides represent narrow zones of overlap between parapatric populations with distinct migration directions and, consequently, expected divergent non-breeding distributions. The composition of the mixed population at a migratory divide and the corresponding non-breeding ranges remain, however, unknown for many Palaearctic-African migrants. Here, we used light-level geolocation to track migration direction and non-breeding grounds of Eurasian reed warblers Acrocephalus scirpaceus from three breeding populations across the species&apos; migratory divide. Moreover, by using feathers grown at non-breeding grounds, we quantified stable isotope composition for individuals with known southwestern (SW) and southeastern (SE) migration directions. On a larger sample per population, we then assessed the proportions of SW- and SE-migrating phenotypes in each of the three populations. All tracked reed warblers from Germany and two thirds of the birds tagged from the Czech population headed initially SW. Nevertheless, about one third of the birds from the Czech site migrated towards SE. No tracking data have been obtained for the Bulgarian population. The initial migration direction determined by geolocators was a strong predictor of the non-breeding region, with SW migrants staying in west Africa and SE migrants in central Africa. Feather delta S-34 and delta N-15 values confirmed the predominance of SW migrants in the German population, the co-occurrence of SW and SE migrants in the Czech population, and indicated a high (72%) proportion of SE migrants in the Bulgarian population. Thus, the combined approach of geolocator tracking and stable isotopic assignments provided clear evidence for the existence of a migratory divide in the southeast of central Europe and predicted non-breeding range in central and central-eastern Africa for the eastern population.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10618 - Ecology

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Avian Biology

ISSN

0908-8857

e-ISSN

—

Svazek periodika

49

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

DK - Dánské království

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000437685600010

EID výsledku v databázi Scopus

2-s2.0-85049588650