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Environmental regulation of individual body size contributes to geographic variation in clonal life cycle expression

Environmental regulation of individual body size contributes to geographic variation in clonal life cycle expression
Environmental regulation of individual body size contributes to geographic variation in clonal life cycle expression

Clonal behavior has been hypothesized to provide an escape from allometric metabolic scaling that limits the maximum mass achieved by a single individual. Here, we demonstrate the capacity of a wide-spread, non-native sea anemone to buffer its colony biomass accumulation rate across environments by modulating ramet body size through environmentally dependent growth, fission, and catabolism. In 2015, thermal reaction norms for growth and fission behavior were constructed using clonal lines of the sea anemone Diadumene lineata. In 2018, variation in growth patterns under a factorial cross of temperature level and oxygen availability was examined to test the hypothesis that individual ramet size is regulated by oxygen limitation in accordance with optimal size theory. Across a wide range of temperatures, colonies accumulated a similar amount of biomass despite a radical shift from unitary to clonal growth, supporting fission as a mechanism to buffer growth rates over a range of conditions. Individual body size appears to be regulated by the environment with increased temperature and reduced oxygen modifying fission and mass-specific growth patterns, leading to the production of smaller-bodied ramets in warm conditions. However, whether anemones in common garden conditions reduce individual body size through catabolism or fission depends on the region of origin and may relate to differences in seasonal temperature patterns among coastlines, which influence the energetic benefits of fission rate plasticity.

0025-3162
Ryan, Will H.
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Adams, Leoni
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Bonthond, Guido
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Mieszkowska, Nova
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Pack, Kathryn E.
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Krueger-Hadfield, Stacy A.
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Ryan, Will H.
8f4f73c0-667d-4f47-a628-f6d51325b4c2
Adams, Leoni
616f6785-0c6e-41b4-830b-9417993122c8
Bonthond, Guido
edf5a6b3-c2e9-488f-bbeb-f824fe21a3ac
Mieszkowska, Nova
0024e8e8-9da9-49c5-ab13-31cd672cddc5
Pack, Kathryn E.
00558f1f-b79a-421e-8b18-c69524396c61
Krueger-Hadfield, Stacy A.
c2fd7491-8dfa-4a0b-b264-9b584d2c01d9

Ryan, Will H., Adams, Leoni, Bonthond, Guido, Mieszkowska, Nova, Pack, Kathryn E. and Krueger-Hadfield, Stacy A. (2019) Environmental regulation of individual body size contributes to geographic variation in clonal life cycle expression. Marine Biology, 166 (12), [157]. (doi:10.1007/s00227-019-3608-z).

Record type: Article

Abstract

Clonal behavior has been hypothesized to provide an escape from allometric metabolic scaling that limits the maximum mass achieved by a single individual. Here, we demonstrate the capacity of a wide-spread, non-native sea anemone to buffer its colony biomass accumulation rate across environments by modulating ramet body size through environmentally dependent growth, fission, and catabolism. In 2015, thermal reaction norms for growth and fission behavior were constructed using clonal lines of the sea anemone Diadumene lineata. In 2018, variation in growth patterns under a factorial cross of temperature level and oxygen availability was examined to test the hypothesis that individual ramet size is regulated by oxygen limitation in accordance with optimal size theory. Across a wide range of temperatures, colonies accumulated a similar amount of biomass despite a radical shift from unitary to clonal growth, supporting fission as a mechanism to buffer growth rates over a range of conditions. Individual body size appears to be regulated by the environment with increased temperature and reduced oxygen modifying fission and mass-specific growth patterns, leading to the production of smaller-bodied ramets in warm conditions. However, whether anemones in common garden conditions reduce individual body size through catabolism or fission depends on the region of origin and may relate to differences in seasonal temperature patterns among coastlines, which influence the energetic benefits of fission rate plasticity.

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Ryan_et_al._Marine_Bio (1) - Accepted Manuscript
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More information

Accepted/In Press date: 15 October 2019
e-pub ahead of print date: 11 November 2019
Published date: December 2019

Identifiers

Local EPrints ID: 436660
URI: http://eprints.soton.ac.uk/id/eprint/436660
ISSN: 0025-3162
PURE UUID: fbee0e29-8e8a-4a8e-a094-4f4ae3f49deb

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Date deposited: 20 Dec 2019 17:52
Last modified: 22 Nov 2021 07:54

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Contributors

Author: Will H. Ryan
Author: Leoni Adams
Author: Guido Bonthond
Author: Nova Mieszkowska
Author: Kathryn E. Pack
Author: Stacy A. Krueger-Hadfield

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