Number of the records: 1
Nonlinearities Lead to Qualitative Differences in Population Dynamics of Predator-Prey Systems
- 1.
SYSNO ASEP 0392102 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nonlinearities Lead to Qualitative Differences in Population Dynamics of Predator-Prey Systems Author(s) Ameixa, Olga (UEK-B) RID
Messelink, G. J. (NL)
Kindlmann, Pavel (UEK-B) RID, ORCID, SAISource Title PLoS ONE. - : Public Library of Science - ISSN 1932-6203
Roč. 8, č. 4 (2013), e62530-e62530Number of pages 9 s. Language eng - English Country US - United States Keywords nonlinear system ; population density ; population dynamics ; predator ; predator prey interaction ; qualitative analysis Subject RIV EH - Ecology, Behaviour R&D Projects ED1.1.00/02.0073 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GEVOL/11/E036 GA ČR - Czech Science Foundation (CSF) Institutional support RVO:67179843 - RVO:67179843 UT WOS 000318341400058 EID SCOPUS 84876721506 DOI 10.1371/journal.pone.0062530 Annotation Since typically there are many predators feeding on most herbivores in natural communities, understanding multiple predator effects is critical for both community and applied ecology. Experiments of multiple predator effects on prey populations are extremely demanding, as the number of treatments and the amount of labour associated with these experiments increases exponentially with the number of species in question. Therefore, researchers tend to vary only presence/absence of the species and use only one (supposedly realistic) combination of their numbers in experiments. However, nonlinearities in density dependence, functional responses, interactions between natural enemies etc. are typical for such systems, and nonlinear models of population dynamics generally predict qualitatively different results, if initial absolute densities of the species studied differ, even if their relative densities are maintained. Therefore, testing combinations of natural enemies without varying their densities may not be sufficient. Here we test this prediction experimentally. We show that the population dynamics of a system consisting of 2 natural enemies (aphid predator Adalia bipunctata (L.), and aphid parasitoid, Aphidius colemani Viereck) and their shared prey (peach aphid, Myzus persicae Sulzer) are strongly affected by the absolute initial densities of the species in question. Even if their relative densities are kept constant, the natural enemy species or combination thereof that most effectively suppresses the prey may depend on the absolute initial densities used in the experiment. Future empirical studies of multiple predator – one prey interactions should therefore use a two-dimensional array of initial densities of the studied species. Varying only combinations of natural enemies without varying their densities is not sufficient and can lead to misleading results. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2014
Number of the records: 1