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Water brownification may increase the invasibility of a submerged non-native macrophyte

Mormul, Roger Paulo; Ahlgren, Johan LU ; Ekvall, Mattias LU ; Hansson, Lars-Anders LU and Brönmark, Christer LU (2012) In Biological Invasions 14(10). p.2091-2099
Abstract
Environmental conditions and human activities play a significant role in structuring novel assemblages of native and non-native species. Ongoing and future climatic change may alter the performance of native and non-native species and their biotic interactions. In the northern hemisphere, expected climate changes include warmer temperatures and higher precipitation, the latter of which may increase dissolved organic carbon (humic) concentrations, resulting in browner water in aquatic ecosystems (brownification). We tested the effects of elevated temperature (3 A degrees C) and brownification on native and non-native aquatic plant production in mesocosms over 56 days. Elodea canadensis, an aquatic invasive plant, had higher relative growth... (More)
Environmental conditions and human activities play a significant role in structuring novel assemblages of native and non-native species. Ongoing and future climatic change may alter the performance of native and non-native species and their biotic interactions. In the northern hemisphere, expected climate changes include warmer temperatures and higher precipitation, the latter of which may increase dissolved organic carbon (humic) concentrations, resulting in browner water in aquatic ecosystems (brownification). We tested the effects of elevated temperature (3 A degrees C) and brownification on native and non-native aquatic plant production in mesocosms over 56 days. Elodea canadensis, an aquatic invasive plant, had higher relative growth rate in terms of both length and weight, as well as higher weight to length ratio when grown in brown versus clear water; E. canadensis did not respond to temperature treatments. Different functional groups of native producers (phytoplankton, periphyton, macrophytes) showed different relationships to temperature and brownification treatments, with the macrophyte response being most notable because it was opposite to that of E. canadensis. Native macrophytes decreased in biomass in browner water, where they represented about 40 % of total biomass compared to 85 % in clear water. In regression analyses, E. canadensis length RGR was best predicted only by water color treatment, but biomass RGR and biomass per length were inversely correlated with native macrophyte biomass, which is consistent with competition. Our results unexpectedly showed water brownification to have more influence on lake invasion than climate warming at this temperature regime. Two pathways emerged for climate to interact with biological invasions in structuring novel communities: directly, if non-native species respond positively to climate change, and indirectly through species interactions, for instance, because water brownification impairs growth of native macrophytes and reduces biotic resistance to invasion. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Invasion, Brown water, Climate change, Light availability, Macrophyte, growth, Biotic resistance, Resource availability
in
Biological Invasions
volume
14
issue
10
pages
2091 - 2099
publisher
Springer
external identifiers
  • wos:000308037700011
  • scopus:84865735313
ISSN
1387-3547
DOI
10.1007/s10530-012-0216-y
project
BECC
CAnMove
language
English
LU publication?
yes
id
795cd9d9-487b-4a62-a528-65ceca015080 (old id 3147517)
date added to LUP
2012-11-21 15:08:41
date last changed
2017-10-22 03:03:36
@article{795cd9d9-487b-4a62-a528-65ceca015080,
  abstract     = {Environmental conditions and human activities play a significant role in structuring novel assemblages of native and non-native species. Ongoing and future climatic change may alter the performance of native and non-native species and their biotic interactions. In the northern hemisphere, expected climate changes include warmer temperatures and higher precipitation, the latter of which may increase dissolved organic carbon (humic) concentrations, resulting in browner water in aquatic ecosystems (brownification). We tested the effects of elevated temperature (3 A degrees C) and brownification on native and non-native aquatic plant production in mesocosms over 56 days. Elodea canadensis, an aquatic invasive plant, had higher relative growth rate in terms of both length and weight, as well as higher weight to length ratio when grown in brown versus clear water; E. canadensis did not respond to temperature treatments. Different functional groups of native producers (phytoplankton, periphyton, macrophytes) showed different relationships to temperature and brownification treatments, with the macrophyte response being most notable because it was opposite to that of E. canadensis. Native macrophytes decreased in biomass in browner water, where they represented about 40 % of total biomass compared to 85 % in clear water. In regression analyses, E. canadensis length RGR was best predicted only by water color treatment, but biomass RGR and biomass per length were inversely correlated with native macrophyte biomass, which is consistent with competition. Our results unexpectedly showed water brownification to have more influence on lake invasion than climate warming at this temperature regime. Two pathways emerged for climate to interact with biological invasions in structuring novel communities: directly, if non-native species respond positively to climate change, and indirectly through species interactions, for instance, because water brownification impairs growth of native macrophytes and reduces biotic resistance to invasion.},
  author       = {Mormul, Roger Paulo and Ahlgren, Johan and Ekvall, Mattias and Hansson, Lars-Anders and Brönmark, Christer},
  issn         = {1387-3547},
  keyword      = {Invasion,Brown water,Climate change,Light availability,Macrophyte,growth,Biotic resistance,Resource availability},
  language     = {eng},
  number       = {10},
  pages        = {2091--2099},
  publisher    = {Springer},
  series       = {Biological Invasions},
  title        = {Water brownification may increase the invasibility of a submerged non-native macrophyte},
  url          = {http://dx.doi.org/10.1007/s10530-012-0216-y},
  volume       = {14},
  year         = {2012},
}