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Active dispersal is differentially affected by inter- and intraspecific competition in closely related nematode species

Nele De Meester UGent, Sofie Derycke UGent, Annelien Rigaux UGent and Tom Moens UGent (2015) OIKOS. 124(5). p.561-570
abstract
Competition is one of the main drivers of dispersal, which can be an important mechanism to achieve permanent or temporal coexistence of multiple species. This coexistence can be achieved by a dispersal-competition tradeoff, spatial store effects or neutral dynamics. Here we test the effect of inter- and intraspecific competition on dispersal of four species of the marine nematode species complex Litoditis marina. A previous study in closed microcosms without a possibility for dispersal had demonstrated pronounced interspecific competition, leading to the exclusion of one species. We now investigated whether 1) the dispersal is affected by interspecific interactions, by intraspecific competition (density) or by food availability, 2) the dispersal dynamics influence assemblage composition and can lead to co-occurrence of the species, and 3) the abiotic environment (here salinity) can affect these dynamics. We show that density is the main driver for dispersal in two of the four species. Dispersal of a third species always started at the same time irrespective of density, whereas in the fourth species interspecific interactions accelerated dispersal. Remarkably, this fourth species was not a strong competitor, suggesting that a dispersal–competition tradeoff does not explain the observed coexistence. Salinity did not alter the timing of dispersal when interspecific interactions were present but did affect assemblage composition. Consequently, spatial store effects may influence coexistence. All four species co-occurred in fairly stable abundances throughout the present experiment indicating the importance of species specific dispersal strategies for coexistence. Co-occurrence can be facilitated because competition is postponed or avoided by dispersal. Neutral dynamics also played a role as intra- and interspecific competition were of similar importance in three of the four species. We conclude that dispersal is a driver of the coexistence of closely related nematode species, and that population density and interspecific interactions shape these dynamics.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
DENSITY-DEPENDENT DISPERSAL, FREE-LIVING MARINE, VARYING ENVIRONMENTS, ESTUARINE NEMATODES, COMMUNITY ECOLOGY, GENE FLOW, COEXISTENCE, EVOLUTION, DYNAMICS, MEIOFAUNA
journal title
OIKOS
Oikos
volume
124
issue
5
pages
561 - 570
Web of Science type
Article
Web of Science id
000356010300004
JCR category
ECOLOGY
JCR impact factor
3.586 (2015)
JCR rank
34/149 (2015)
JCR quartile
1 (2015)
ISSN
0030-1299
DOI
10.1111/oik.01779
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
5780048
handle
http://hdl.handle.net/1854/LU-5780048
date created
2014-12-10 14:50:10
date last changed
2016-12-19 15:47:07
@article{5780048,
  abstract     = {Competition is one of the main drivers of dispersal, which can be an important mechanism to achieve permanent or temporal coexistence of multiple species. This coexistence can be achieved by a dispersal-competition tradeoff, spatial store effects or neutral dynamics. Here we test the effect of inter- and intraspecific competition on dispersal of four species of the marine nematode species complex Litoditis marina. A previous study in closed microcosms without a possibility for dispersal had demonstrated pronounced interspecific competition, leading to the exclusion of one species. We now investigated whether 1) the dispersal is affected by interspecific interactions, by intraspecific competition (density) or by food availability, 2) the dispersal dynamics influence assemblage composition and can lead to co-occurrence of the species, and 3) the abiotic environment (here salinity) can affect these dynamics. We show that density is the main driver for dispersal in two of the four species. Dispersal of a third species always started at the same time irrespective of density, whereas in the fourth species interspecific interactions accelerated dispersal. Remarkably, this fourth species was not a strong competitor, suggesting that a dispersal--competition tradeoff does not explain the observed coexistence. Salinity did not alter the timing of dispersal when interspecific interactions were present but did affect assemblage composition. Consequently, spatial store effects may influence coexistence. All four species co-occurred in fairly stable abundances throughout the present experiment indicating the importance of species specific dispersal strategies for coexistence. Co-occurrence can be facilitated because competition is postponed or avoided by dispersal. Neutral dynamics also played a role as intra- and interspecific competition were of similar importance in three of the four species. We conclude that dispersal is a driver of the coexistence of closely related nematode species, and that population density and interspecific interactions shape these dynamics.},
  author       = {De Meester, Nele and Derycke, Sofie and Rigaux, Annelien and Moens, Tom},
  issn         = {0030-1299},
  journal      = {OIKOS},
  keyword      = {DENSITY-DEPENDENT DISPERSAL,FREE-LIVING MARINE,VARYING ENVIRONMENTS,ESTUARINE NEMATODES,COMMUNITY ECOLOGY,GENE FLOW,COEXISTENCE,EVOLUTION,DYNAMICS,MEIOFAUNA},
  language     = {eng},
  number       = {5},
  pages        = {561--570},
  title        = {Active dispersal is differentially affected by inter- and intraspecific competition in closely related nematode species},
  url          = {http://dx.doi.org/10.1111/oik.01779},
  volume       = {124},
  year         = {2015},
}

Chicago
De Meester, Nele, Sofie Derycke, Annelien Rigaux, and Tom Moens. 2015. “Active Dispersal Is Differentially Affected by Inter- and Intraspecific Competition in Closely Related Nematode Species.” Oikos 124 (5): 561–570.
APA
De Meester, N., Derycke, S., Rigaux, A., & Moens, T. (2015). Active dispersal is differentially affected by inter- and intraspecific competition in closely related nematode species. OIKOS, 124(5), 561–570.
Vancouver
1.
De Meester N, Derycke S, Rigaux A, Moens T. Active dispersal is differentially affected by inter- and intraspecific competition in closely related nematode species. OIKOS. 2015;124(5):561–70.
MLA
De Meester, Nele, Sofie Derycke, Annelien Rigaux, et al. “Active Dispersal Is Differentially Affected by Inter- and Intraspecific Competition in Closely Related Nematode Species.” OIKOS 124.5 (2015): 561–570. Print.