Počet záznamů: 1  

Species pool size and realized species richness affect productivity differently: A modeling study

  1. 1.
    0481594 - BC 2018 RIV FR eng J - Článek v odborném periodiku
    Stachová, T. - Lepš, Jan
    Species pool size and realized species richness affect productivity differently: A modeling study.
    Acta Oecologica-International Journal of Ecology. Roč. 36, č. 6 (2010), s. 578-586. ISSN 1146-609X. E-ISSN 1873-6238
    Grant CEP: GA ČR GD206/08/H044; GA MŠMT LC06073
    Výzkumný záměr: CEZ:AV0Z50070508
    Klíčová slova: biodiversity * ecosystem functioning * diversity-productivity relationship
    Obor OECD: Ecology
    Impakt faktor: 1.460, rok: 2010
    http://www.sciencedirect.com/science/article/pii/S1146609X10001037

    Current and expected decline in biodiversity have motivated a number of experiments studying how biodiversity affects ecosystem functioning. The positive relationship is usually found in experiments where species pool is manipulated, the relationship between productivity and realized species richness does not show any single trend.We constructed a simple competition model for a plant community based on the classical Lotka-Volterra equations, with randomly generated parameters. We varied the species pool size and intensity of competition (range of competition coefficients). Then, we compared two measures of diversity used as predictors of productivity: (1) the size of the species pool and (2) the realized species richness, i.e. the number of species that remained in the system after competitive exclusion. Simulation results showed that productivity was always positively affected by the size of the species pool. With increasing species pool, both the selection effect and complementarity increase. The relationship between realized species richness and productivity was extremely weak within a set of simulations with a fixed species pool (i.e. where the diversity gradient was caused only by differences in the randomly generated parameters). The relationship between realized species richness and productivity was slightly positive for small species pool sizes and slightly negative for larger species pools. A species with high carrying capacity within the generated set of species usually decreases the chance of other species to survive but increases the productivity of the mixture, leading to negative diversity productivity relationship. On the contrary, presence of highly complementary species (i.e. species with low mutual competition coefficients) increases both, the realized species richness and productivity, leading to positive diversity productivity relationship. These two effects mostly counterbalance each other. These trends are not affected by the compet. intensity.
    Trvalý link: http://hdl.handle.net/11104/0277310

     
     
Počet záznamů: 1  

  Tyto stránky využívají soubory cookies, které usnadňují jejich prohlížení. Další informace o tom jak používáme cookies.