Do the rich get richer? Varying effects of tree species identity and diversity on the richness of understory taxa
Jazyk angličtina Země Spojené státy americké Médium print
Typ dokumentu časopisecké články
PubMed
27859088
DOI
10.1002/ecy.1479
Knihovny.cz E-zdroje
- Klíčová slova
- biodiversity, detritivorous beetles, earthworms, ecosystem functioning, herbs, predatory beetles, saproxylic beetles, structural equation model, temperate forests, trees,
- MeSH
- biodiverzita * MeSH
- brouci MeSH
- ekosystém MeSH
- lesy * MeSH
- půda MeSH
- stromy klasifikace růst a vývoj MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- půda MeSH
Understory herbs and soil invertebrates play key roles in soil formation and nutrient cycling in forests. Studies suggest that diversity in the canopy and in the understory are positively associated, but these studies often confound the effects of tree species diversity with those of tree species identity and abiotic conditions. We combined extensive field sampling with structural equation modeling to evaluate the simultaneous effects of tree diversity on the species diversity of understory herbs, beetles, and earthworms. The diversity of earthworms and saproxylic beetles was directly and positively associated with tree diversity, presumably because species of both these taxa specialize on certain species of trees. Tree identity also strongly affected diversity in the understory, especially for herbs, likely as a result of interspecific differences in canopy light transmittance or litter decomposition rates. Our results suggest that changes in forest management will disproportionately affect certain understory taxa. For instance, changes in canopy diversity will affect the diversity of earthworms and saproxylic beetles more than changes in tree species composition, whereas the converse would be expected for understory herbs and detritivorous beetles. We conclude that the effects of tree diversity on understory taxa can vary from positive to negative and may affect biogeochemical cycling in temperate forests. Thus, maintaining high diversity in temperate forests can promote the diversity of multiple taxa in the understory.
Biological and Environmental Sciences University of Stirling Stirling FK9 4LA United Kingdom
Department of Plant Sciences University of Oxford Oxford OX1 3RB United Kingdom
Wetland and Aquatic Research Center U S Geological Survey Lafayette Louisiana 70506 USA