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Consequences of migratory coupling of predators and prey when mediated by human actions

Singh, Navinder and Ecke, Frauke and Katzner, Todd and Bagchi, Sumanta and Sandström, Per and Hörnfeldt, Birger (2021). Consequences of migratory coupling of predators and prey when mediated by human actions. Diversity and Distributions. 27 , 1848-1860
[Research article]

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Abstract

Aim Animal migrations influence ecosystem structure, dynamics and persistence of predator and prey populations. The theory of migratory coupling postulates that aggregations of migrant prey can induce large-scale synchronized movements in predators, and this coupling is consequential for the dynamics of ecological communities. The degree to which humans influence these interactions remains largely unknown. We tested whether creation of large resource pulses by humans such as seasonal herding of reindeer Rangifer tarandus and hunting of moose, Alces alces, can induce migratory coupling with Golden Eagles, Aquila chrysaetos, and whether these lead to demographic consequences for the eagles. Location Fennoscandia. Methods We used movement data from 32 tracked Golden Eagles spanning 125 annual migratory cycles over 8 years. We obtained reindeer distribution data through collaboration with reindeer herders based on satellite tracking of reindeer, and moose harvest data from the national hunting statistics for Sweden. We assessed demographic consequences for eagles from ingesting lead from ammunition fragments in moose carcasses through survival estimates and their links with lead concentrations in eagles' blood. Results In spring, eagles migrated hundreds of kilometres to be spatially and temporally coupled with calving reindeer, whereas in autumn, eagles matched their distribution with the location and timing of moose hunt. Juveniles were more likely to couple with reindeer calving, whereas adults were particularly drawn to areas of higher moose harvest. Due to this coupling, eagles ingested lead from spent ammunition in moose offal and carcasses and the resulting lead toxicity increased the risk of mortality by 3.4 times. Main conclusions We show how migratory coupling connects landscape processes and that human actions can influence migratory coupling over large spatial scales and increase demographic risks for predators. We provide vital knowledge towards resolving human-wildlife conflicts and the conservation of protected species over a large spatial and temporal scale.

Authors/Creators:Singh, Navinder and Ecke, Frauke and Katzner, Todd and Bagchi, Sumanta and Sandström, Per and Hörnfeldt, Birger
Title:Consequences of migratory coupling of predators and prey when mediated by human actions
Series Name/Journal:Diversity and Distributions
Year of publishing :2021
Volume:27
Page range:1848-1860
Number of Pages:13
Publisher:WILEY
ISSN:1366-9516
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Fish and Wildlife Management
Keywords:conflict, lead poisoning, migration, predator-prey, reindeer, scale, scavengers, synchrony, toxicology
URN:NBN:urn:nbn:se:slu:epsilon-p-112975
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112975
Additional ID:
Type of IDID
DOI10.1111/ddi.13373
Web of Science (WoS)000669619500001
ID Code:25511
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: SLUpub Connector
Deposited On:27 Sep 2021 12:25
Metadata Last Modified:27 Sep 2021 12:31

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