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Principles of niche expansion

Sjödin, Henrik LU ; Ripa, Jörgen LU and Lundberg, Per LU (2018) In Proceedings of the Royal Society B: Biological Sciences 285(1893).
Abstract

Niche expansion is attained by adaptations in two generalized phenotypical traits - niche position and niche width. This gives room for a wide range of conceptual ways of niche filling. The niche variation hypothesis reduces the range by predicting that expansion occurs by increasing variation in niche position, which has been debated on empirical and theoretical grounds as also other options seem possible. Here, we propose a general theory of niche expansion. We review empirical data and show with an eco-evolutionary model how resource diversity and a trade-off in resource acquisition steer niche evolution consistent with observations. We show that the range can be reduced to a discrete set of two orthogonal ways of niche filling,... (More)

Niche expansion is attained by adaptations in two generalized phenotypical traits - niche position and niche width. This gives room for a wide range of conceptual ways of niche filling. The niche variation hypothesis reduces the range by predicting that expansion occurs by increasing variation in niche position, which has been debated on empirical and theoretical grounds as also other options seem possible. Here, we propose a general theory of niche expansion. We review empirical data and show with an eco-evolutionary model how resource diversity and a trade-off in resource acquisition steer niche evolution consistent with observations. We show that the range can be reduced to a discrete set of two orthogonal ways of niche filling, through (1) strict phenotypical differentiation in niche position or (2) strict individual generalization. When individual generalization is costly, niche expansion undergoes a shift from (2) to (1) at a point where the resource diversity becomes sufficiently large. Otherwise, niche expansion always follows (2), consistent with earlier results. We show that this either-or response can operate at both evolutionary and short-term time scales. This reduces the principles of niche expansion under environmental change to a notion of orthogonality, dictated by resource diversity and a resource-acquisition trade-off.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
individual specialization, niche evolution, niche expansion, niche variation hypothesis, niche width
in
Proceedings of the Royal Society B: Biological Sciences
volume
285
issue
1893
publisher
Royal Society
external identifiers
  • scopus:85059818410
ISSN
0962-8452
DOI
10.1098/rspb.2018.2603
language
English
LU publication?
yes
id
4d85c7c3-838b-49f2-a6a2-926152ca37d6
date added to LUP
2019-01-24 10:27:41
date last changed
2019-02-20 11:44:17
@article{4d85c7c3-838b-49f2-a6a2-926152ca37d6,
  abstract     = {<p>Niche expansion is attained by adaptations in two generalized phenotypical traits - niche position and niche width. This gives room for a wide range of conceptual ways of niche filling. The niche variation hypothesis reduces the range by predicting that expansion occurs by increasing variation in niche position, which has been debated on empirical and theoretical grounds as also other options seem possible. Here, we propose a general theory of niche expansion. We review empirical data and show with an eco-evolutionary model how resource diversity and a trade-off in resource acquisition steer niche evolution consistent with observations. We show that the range can be reduced to a discrete set of two orthogonal ways of niche filling, through (1) strict phenotypical differentiation in niche position or (2) strict individual generalization. When individual generalization is costly, niche expansion undergoes a shift from (2) to (1) at a point where the resource diversity becomes sufficiently large. Otherwise, niche expansion always follows (2), consistent with earlier results. We show that this either-or response can operate at both evolutionary and short-term time scales. This reduces the principles of niche expansion under environmental change to a notion of orthogonality, dictated by resource diversity and a resource-acquisition trade-off.</p>},
  articleno    = {20182603},
  author       = {Sjödin, Henrik and Ripa, Jörgen and Lundberg, Per},
  issn         = {0962-8452},
  keyword      = {individual specialization,niche evolution,niche expansion,niche variation hypothesis,niche width},
  language     = {eng},
  month        = {12},
  number       = {1893},
  publisher    = {Royal Society},
  series       = {Proceedings of the Royal Society B: Biological Sciences},
  title        = {Principles of niche expansion},
  url          = {http://dx.doi.org/10.1098/rspb.2018.2603},
  volume       = {285},
  year         = {2018},
}