Bird migration in space and time: chain migration by Eurasian curlew <i>Numenius arquata arquata</i> along the East Atlantic Flyway

Pederson, R.; Bocher, Pierrick; Garthe, Stefan; Fort, Jérôme; Mercker, Moritz; Auernhammer, Verena; Boschert, M.; Delaporte, Philippe; Elts, Jaanus; Fiedler, Wolfgang; Korniluk, Michał; Krupiński, Dominik; Marja, Riho; Rousseau, Pierre; Thiess, Lukas; Schwemmer, Philipp

doi:10.1111/jav.02924

Cited by 7 publications

(2 citation statements)

References 49 publications

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“…In a study by Pederson et al . (2022), a total of 85 curlews were equipped with solar‐powered Global Positioning System (GPS) Global System for Mobile Communications (GSM) data loggers to assess their general migration patterns along the East Atlantic Flyway. For the current study, we selected a subset of n = 51 individuals from this dataset which had recorded data at sufficiently high temporal resolution to allow for accurate altitude measurements (Poessel et al ., 2018, Péron et al ., 2020; Schwemmer et al ., 2021; see below) and which at the same time crossed our study area.…”

Section: Methodsmentioning

confidence: 99%

Assessing potential conflicts between offshore wind farms and migration patterns of a threatened shorebird species

Schwemmer¹,

Pederson²,

Haecker³

et al. 2022

Animal Conservation

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Installation of offshore wind farms (OWFs) is becoming increasingly important to ensure a reduction in greenhouse gas emissions; however, OWFs also pose a threat to migrating birds and other wildlife. Informed marine spatial planning is therefore crucial, but individual-based high-resolution data on bird migration across the sea are currently lacking. We equipped 51 individuals of the near threatened Eurasian curlew Numenius arquata with GPS tags (118 flight tracks) across multiple years and countries to assess their four-dimensional migration routes across the Baltic Sea (i.e. flight tracks, altitudes, phenology and diurnal patterns), to inform collision-risk models and assess potential conflicts with current and future OWFs. Despite a broad-front migration, we identified core migration areas in the south-western Baltic Sea (and adjacent mainland), largely overlapping with already operating OWFs. Generalized linear models based on a resampling procedure to overcome autocorrelation of tracking data showed that flight altitudes across the sea and during autumn (median: 60 m) were significantly lower than those across land (median: 335 m) and during spring (median across sea: 150; median across land: 576 m). Across the sea, curlews spent 74.8% and 62.2% of their migration times below 300 m during autumn and spring, respectively, indicating a potentially high collision risk with OWFs. The mean flight speed was 56.3 km/h (AE20.3 km/h). Migration intensity was highest at night over a 10-day period during April, suggesting that restricted turbine operation for several days might be a possible management measure. Our study showed that, even for broad-front migrants, it is possible to identify particularly sensitive sea areas deserving special protection enabling a sound marine spatial planning. This is a crucial finding also for various other shorebirds on the East Atlantic Flyway. Further studies are needed to assess the behavioural reactions of migrating birds with respect to OWFs using high-resolution tracking data.

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Section: Methodsmentioning

confidence: 99%

Assessing potential conflicts between offshore wind farms and migration patterns of a threatened shorebird species

Schwemmer¹,

Pederson²,

Haecker³

et al. 2022

Animal Conservation

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“…We did not have information on sex for the majority of the individuals included in this study, and we cannot exclude that some of our results may be sex-related. The timing of arrival and departure from the breeding grounds would likely be the most affected, as in many shorebird species, males arrive earlier than females to establish territories (Bishop et al, 2005;Carneiro et al, 2019;Remisiewicz & Wennerberg, 2006), and also depart later following a longer period of chick care (Meissner & Krupa, 2017;Pederson et al, 2022;Wright et al, 2022;Ydenberg et al, 2005). In our tracking data, birds that arrive later then leave earlier relative to others may simply be females, however given the substantially shorter time that females in many species of shorebirds spend on the breeding grounds (Billerman et al, 2022), we might then expect them to be able to fully recover from delays relative to the entire population.…”

Section: Discussionmentioning

confidence: 99%

Carry-over Effects in Arctic-breeding Shorebirds: A Cross-species Perspective

English¹

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Avian studies have long been limited to single populations at a single time and place. However, such studies overlook carry-over effects, where conditions in one season cause fitness consequences in subsequent seasons. As technological advances make it possible to follow individual birds over a full year, it has become clear that carry-over effects can have fitness implications, and are therefore important to consider. In this thesis, I use tracking and physiological data from 14 species of Arctic-breeding shorebirds to link reproductive and timing variation to a bird's earlier experiences.In general, carry-over effects appear to influence important metrics of breeding and timing in Arctic-breeding shorebirds. The timing of nest initiation was influenced by both prior conditions, inferred through migration timing, and local weather conditions. While patterns were generally consistent across species, variation in the influence of carry-over effects among species merits further research. Tracking data also showed that delays in one season continue into the next, although seasonally variable mitigation means that birds generally reduced the extent of delays, potentially at a physiological cost. Winter is the exception, as birds appear able to fully "reset the clock" during this period, preventing delays from accumulating across years. Winter levels of the stress hormone corticosterone (CORT) in feathers showed a positive relationship with nest success in the subsequent summer, supporting the idea that high levels of CORT may not always imply that an individual is struggling, or at least that the relationship between CORT and fitness may be complex. This thesis is one of the first multi-species studies of carry-over effects, and is unparalleled in the number of species and sample size within the carry-over effect iii literature. It is additionally novel for the multiple methods used to assess carry-over effects across a similar group of species. The importance of carry-over effects demonstrated within this thesis highlights the need for using a whole year approach to assess what influences variation in fitness, especially in migratory species. Doing so will improve our ability to identify and understand the causes of factors affecting demographic rates and driving declines across taxa.

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Tracking wintering areas and post-breeding migration of a declining farmland bird – An indispensable basis for successful conservation

Kämpfer

Kruckenberg²,

Düttmann

et al. 2023

Global Ecology and Conservation

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Bird migration in space and time: chain migration by Eurasian curlew Numenius arquata arquata along the East Atlantic Flyway

Cited by 7 publications

References 49 publications

Assessing potential conflicts between offshore wind farms and migration patterns of a threatened shorebird species

Assessing potential conflicts between offshore wind farms and migration patterns of a threatened shorebird species

Carry-over Effects in Arctic-breeding Shorebirds: A Cross-species Perspective

Tracking wintering areas and post-breeding migration of a declining farmland bird – An indispensable basis for successful conservation

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