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Principles of niche expansion

Author:
  • Henrik Sjödin
  • Jörgen Ripa
  • Per Lundberg
Publishing year: 2018-12-19
Language: English
Publication/Series: Proceedings of the Royal Society B: Biological Sciences
Volume: 285
Issue: 1893
Document type: Journal article
Publisher: Royal Society

Abstract english

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.

Keywords

  • Evolutionary Biology
  • individual specialization
  • niche evolution
  • niche expansion
  • niche variation hypothesis
  • niche width

Other

Published
  • ISSN: 0962-8452
Henrik Sjödin
E-mail: henrik [dot] sjodin [at] biol [dot] lu [dot] se

Researcher

Evolutionary ecology

E-A224

Sölvegatan 37, Lund

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