Advanced

Maladaptive migration behaviour in hybrids links to predator-mediated ecological selection

Pärssinen, Varpu LU ; Hulthén, Kaj LU ; Brönmark, Christer LU ; Skov, Christian LU ; Brodersen, Jakob LU ; Baktoft, Henrik ; Chapman, Ben B. LU ; Hansson, Lars Anders LU and Nilsson, Per Anders LU (2020) In Journal of Animal Ecology 89(11). p.2596-2604
Abstract

Different migratory species have evolved distinct migratory characteristics that improve fitness in their particular ecological niches. However, when such species hybridize, migratory traits from parental species can combine maladaptively and cause hybrids to fall between parental fitness peaks, with potential consequences for hybrid viability and species integrity. Here, we take advantage of a natural cross-breeding incident to study migratory behaviour in naturally occurring hybrids as well as in their parental species and explore links between migratory traits and predation risk. To achieve this, we used electronic tags and passive telemetry to record detailed individual migration patterns (timing and number of migratory trips) in... (More)

Different migratory species have evolved distinct migratory characteristics that improve fitness in their particular ecological niches. However, when such species hybridize, migratory traits from parental species can combine maladaptively and cause hybrids to fall between parental fitness peaks, with potential consequences for hybrid viability and species integrity. Here, we take advantage of a natural cross-breeding incident to study migratory behaviour in naturally occurring hybrids as well as in their parental species and explore links between migratory traits and predation risk. To achieve this, we used electronic tags and passive telemetry to record detailed individual migration patterns (timing and number of migratory trips) in two common freshwater fish species, roach Rutilus rutilus, common bream Abramis brama as well as their hybrids. Next, we scanned for tags regurgitated by a key avian predator (great cormorant Phalacrocorax carbo) at nearby roosting sites, allowing us to directly link migratory behaviour to predation risk in the wild. We found that hybrid individuals showed a higher number of short, multi-trip movements between lake and stream habitats as compared to both parental species. The mean date of first lake departure differed between bream and roach by more than 10 days, while hybrids departed in two distinct peaks that overlapped with the parental species' averages. Moreover, the probability of cormorant predation increased with multi-trip movement frequency across species and was higher for hybrids. Our data provide novel insights into hybrid viability, with links to predator-mediated ecological selection. Increased exposure to predators via maladaptive migratory behaviour reduces hybrid survival and can thereby reinforce species integrity.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
fish, hybrid viability, partial migration, predator–prey, species integrity
in
Journal of Animal Ecology
volume
89
issue
11
pages
9 pages
publisher
Federation of European Neuroscience Societies and Blackwell Publishing Ltd
external identifiers
  • scopus:85089659196
  • pmid:32745243
ISSN
0021-8790
DOI
10.1111/1365-2656.13308
language
English
LU publication?
yes
id
f084f40c-a7e3-467d-bca4-33600128c37d
date added to LUP
2021-01-15 08:10:34
date last changed
2021-02-17 01:44:43
@article{f084f40c-a7e3-467d-bca4-33600128c37d,
  abstract     = {<p>Different migratory species have evolved distinct migratory characteristics that improve fitness in their particular ecological niches. However, when such species hybridize, migratory traits from parental species can combine maladaptively and cause hybrids to fall between parental fitness peaks, with potential consequences for hybrid viability and species integrity. Here, we take advantage of a natural cross-breeding incident to study migratory behaviour in naturally occurring hybrids as well as in their parental species and explore links between migratory traits and predation risk. To achieve this, we used electronic tags and passive telemetry to record detailed individual migration patterns (timing and number of migratory trips) in two common freshwater fish species, roach Rutilus rutilus, common bream Abramis brama as well as their hybrids. Next, we scanned for tags regurgitated by a key avian predator (great cormorant Phalacrocorax carbo) at nearby roosting sites, allowing us to directly link migratory behaviour to predation risk in the wild. We found that hybrid individuals showed a higher number of short, multi-trip movements between lake and stream habitats as compared to both parental species. The mean date of first lake departure differed between bream and roach by more than 10 days, while hybrids departed in two distinct peaks that overlapped with the parental species' averages. Moreover, the probability of cormorant predation increased with multi-trip movement frequency across species and was higher for hybrids. Our data provide novel insights into hybrid viability, with links to predator-mediated ecological selection. Increased exposure to predators via maladaptive migratory behaviour reduces hybrid survival and can thereby reinforce species integrity.</p>},
  author       = {Pärssinen, Varpu and Hulthén, Kaj and Brönmark, Christer and Skov, Christian and Brodersen, Jakob and Baktoft, Henrik and Chapman, Ben B. and Hansson, Lars Anders and Nilsson, Per Anders},
  issn         = {0021-8790},
  language     = {eng},
  month        = {11},
  number       = {11},
  pages        = {2596--2604},
  publisher    = {Federation of European Neuroscience Societies and Blackwell Publishing Ltd},
  series       = {Journal of Animal Ecology},
  title        = {Maladaptive migration behaviour in hybrids links to predator-mediated ecological selection},
  url          = {http://dx.doi.org/10.1111/1365-2656.13308},
  doi          = {10.1111/1365-2656.13308},
  volume       = {89},
  year         = {2020},
}