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Timing and synchrony of migration in a freshwater fish : Consequences for survival

Hulthén, Kaj LU ; Chapman, Ben B. LU ; Nilsson, P. Anders LU orcid ; Hansson, Lars Anders LU orcid ; Skov, Christian LU ; Brodersen, Jakob LU and Brönmark, Christer LU (2022) In Journal of Animal Ecology 91(10). p.2103-2112
Abstract

Animal migration is one of the most spectacular and visible behavioural phenomena in nature with profound implications for a range of ecological and evolutionary processes. Successful migration hinges on the ability to exploit temporary resources (e.g. food) and evade threats (e.g. predators) as they arise, and thus the timing of migration is often regarded as a dominant predictor of individual migratory success. However, with the exception of intensively studied taxa (mainly birds), relatively few studies have investigated inter-individual annual and seasonal variation in migratory timing and performance, or tested predictions on how migration across high and low predation-risk habitats may exert selection on migratory timing. In... (More)

Animal migration is one of the most spectacular and visible behavioural phenomena in nature with profound implications for a range of ecological and evolutionary processes. Successful migration hinges on the ability to exploit temporary resources (e.g. food) and evade threats (e.g. predators) as they arise, and thus the timing of migration is often regarded as a dominant predictor of individual migratory success. However, with the exception of intensively studied taxa (mainly birds), relatively few studies have investigated inter-individual annual and seasonal variation in migratory timing and performance, or tested predictions on how migration across high and low predation-risk habitats may exert selection on migratory timing. In particular, studies that assess the survival consequences of variation in migratory timing remain rare, which is most likely due to the logistical challenges associated with monitoring survival success and population-level characteristics simultaneously. Here, we address the above-mentioned questions using roach Rutilus rutilus, a fish that migrates from lakes characterised by high predation risk into low-risk streams during winter. Specifically, we used individual-based tracking of roach in two European lake systems over multiple migration periods (9 and 7 years respectively), to obtain highly detailed (year-round scheduling, repeat journeys and the fate of individuals) data on the variability/synchrony of migratory timing in spring and autumn respectively. We report seasonal differences in the variability of migratory timing, with lower variance and higher migration synchrony in spring lake arrival timing as compared to autumn lake departure timing. Furthermore, the timing of autumn migration is more variable across years than the timing of spring migration. Second, we find that later arrival to the lake habitat is positively associated with apparent survival from 1 year to the next, whereas we found no effect of lake departure timing on survival probability. These findings represent rare evidence showing how intraspecific variation in timing in migratory fish differs across years and seasons, and how variation in timing can translate into survival consequences for prey in systems characterised by high predation risk.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
aquatic ecology, individual differences, migration, movement ecology, predation risk, timing
in
Journal of Animal Ecology
volume
91
issue
10
pages
10 pages
publisher
Wiley-Blackwell
external identifiers
  • pmid:35899786
  • scopus:85135539180
ISSN
0021-8790
DOI
10.1111/1365-2656.13790
language
English
LU publication?
yes
id
157fd6c8-790f-4e7c-822d-0d3cb6144519
date added to LUP
2022-10-18 15:14:38
date last changed
2024-02-18 01:00:56
@article{157fd6c8-790f-4e7c-822d-0d3cb6144519,
  abstract     = {{<p>Animal migration is one of the most spectacular and visible behavioural phenomena in nature with profound implications for a range of ecological and evolutionary processes. Successful migration hinges on the ability to exploit temporary resources (e.g. food) and evade threats (e.g. predators) as they arise, and thus the timing of migration is often regarded as a dominant predictor of individual migratory success. However, with the exception of intensively studied taxa (mainly birds), relatively few studies have investigated inter-individual annual and seasonal variation in migratory timing and performance, or tested predictions on how migration across high and low predation-risk habitats may exert selection on migratory timing. In particular, studies that assess the survival consequences of variation in migratory timing remain rare, which is most likely due to the logistical challenges associated with monitoring survival success and population-level characteristics simultaneously. Here, we address the above-mentioned questions using roach Rutilus rutilus, a fish that migrates from lakes characterised by high predation risk into low-risk streams during winter. Specifically, we used individual-based tracking of roach in two European lake systems over multiple migration periods (9 and 7 years respectively), to obtain highly detailed (year-round scheduling, repeat journeys and the fate of individuals) data on the variability/synchrony of migratory timing in spring and autumn respectively. We report seasonal differences in the variability of migratory timing, with lower variance and higher migration synchrony in spring lake arrival timing as compared to autumn lake departure timing. Furthermore, the timing of autumn migration is more variable across years than the timing of spring migration. Second, we find that later arrival to the lake habitat is positively associated with apparent survival from 1 year to the next, whereas we found no effect of lake departure timing on survival probability. These findings represent rare evidence showing how intraspecific variation in timing in migratory fish differs across years and seasons, and how variation in timing can translate into survival consequences for prey in systems characterised by high predation risk.</p>}},
  author       = {{Hulthén, Kaj and Chapman, Ben B. and Nilsson, P. Anders and Hansson, Lars Anders and Skov, Christian and Brodersen, Jakob and Brönmark, Christer}},
  issn         = {{0021-8790}},
  keywords     = {{aquatic ecology; individual differences; migration; movement ecology; predation risk; timing}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{2103--2112}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Journal of Animal Ecology}},
  title        = {{Timing and synchrony of migration in a freshwater fish : Consequences for survival}},
  url          = {{http://dx.doi.org/10.1111/1365-2656.13790}},
  doi          = {{10.1111/1365-2656.13790}},
  volume       = {{91}},
  year         = {{2022}},
}