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A cross-scale troph...
A cross-scale trophic cascade from large predatory fish to algae in coastal ecosystems
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- Donadi, Serena (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Stockholms universitet,Institutionen för ekologi, miljö och botanik,Stockholms universitets Östersjöcentrum,Swedish University of Agricultural Sciences (SLU), Sweden,Institutionen för akvatiska resurser,Department of Aquatic Resources,Stockholm University
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- Austin, Åsa N. (author)
- Stockholms universitet,Institutionen för ekologi, miljö och botanik
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- Bergström, Ulf (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources
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Eriksson, B. K. (author)
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- Hansen, Joakim P. (author)
- Stockholms universitet,Stockholms universitets Östersjöcentrum
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- Jacobson, P. (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources
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- Sundblad, G. (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources,AquaBiota Water Research
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van Regteren, M. (author)
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- Eklöf, Johan S. (author)
- Stockholms universitet,Institutionen för ekologi, miljö och botanik
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(creator_code:org_t)
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- 2017-07-19
- 2017
- English.
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In: Proceedings of the Royal Society of London. Biological Sciences. - : The Royal Society. - 0962-8452 .- 1471-2954. ; 284:1859
- Related links:
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https://royalsociety...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Subject headings
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- Trophic cascades occur in many ecosystems, but the factors regulating them are still elusive. We suggest that an overlooked factor is that trophic interactions (TIs) are often scale-dependent and possibly interact across spatial scales. To explore the role of spatial scale for trophic cascades, and particularly the occurrence of cross-scale interactions (CSIs), we collected and analysed food-web data from 139 stations across 32 bays in the Baltic Sea. We found evidence of a four-level trophic cascade linking TIs across two spatial scales: at bay scale, piscivores (perch and pike) controlled mesopredators (three-spined stickleback), which in turn negatively affected epifaunal grazers. At station scale (within bays), grazers on average suppressed epiphytic algae, and indirectly benefitted habitat-forming vegetation. Moreover, the direction and strength of the grazer-algae relationship at station scale depended on the piscivore biomass at bay scale, indicating a cross-scale interaction effect, potentially caused by a shift in grazer assemblage composition. In summary, the trophic cascade from piscivores to algae appears to involve TIs that occur at, but also interact across, different spatial scales. Considering scale-dependence in general, and CSIs in particular, could therefore enhance our understanding of trophic cascades.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- trophic cascade
- cross-scale interaction
- piecewise structural equation model
- algal bloom
- piscivorous fish
- Baltic Sea
Publication and Content Type
- ref (subject category)
- art (subject category)
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