Increased density of conspecifics caused niche contraction in a multispecific passerine assemblage

Ecology, Journal Year: 2024, Volume and Issue: 105(5)

Published: March 25, 2024

Abstract Competition is a prominent mechanism driving population dynamics and structuring community assemblage, which can be investigated by linking shifts in species’ ecological niche the densities of sympatric species because release from competitive constraints density‐dependent process. In this work we determine how steppe passerine segregates their niches evaluate role competition inducing changes species. We built multidimensional (with Gaussian kernel density estimators) using data on habitat features used 10 bird collected seven sites natural steppes Central Spain over 2 consecutive years. computed distance similarity metrics to explore partitioning community. Next, ran multivariate linear regression models effects conspecific heterospecific (as proxies intraspecific interspecific competition, respectively) breadth and/or position three most abundant found low overlap assemblage but varying levels among pairs species, could increase likelihood current operating However, no effect or position, although was negatively related breadth. Contrary predictions theory, increased conspecifics caused contraction. Our results multispecies system contribute advanced knowledge biotic mechanisms wildlife communities within framework theory.

Language: Английский

Evaluation of Soil Quality in Different Bletilla striata Agroforestry Systems in Eastern China

Horticulturae, Journal Year: 2024, Volume and Issue: 10(12), P. 1308 - 1308

Published: Dec. 9, 2024

Agroforestry is being promoted as a feasible land use management to improve understory economic benefits. However, there are few studies on species selection and the comprehensive evaluation of soil quality change in rhizoma bletillae (Bletilla striata) agroforestry systems. The index (SQI) minimum dataset (MDS) methods can reflect overall condition were effective tools for understanding different cultivation In this study, we evaluated four models (including three systems: PeB, moso bamboo (Phyllostachys edulis)–rhizoma bletillae; PoB, plane trees (Platanus orientali)–rhizoma CcB, pecan (Carya cathayensis)–rhizoma CK, monoculture. total (TDS) consisted 15 parameters containing physical, chemical, biological characteristics. results showed that organic carbon (SOC), nitrogen (TN), phosphorus (TP) finally selected established MDS. could significantly influence quality. Compared with SQI CcB increased decreased PeB PoB. Soil water content (SWC), nitrate (NO3−-N), dissolved (DOC), SOC, TN, TP contents higher than other models. Based various indicators analysis, was best improving These findings based MDS be used an indicator systems selection. It provides theoretical guidance practice bionic sustainable bletillae.

Language: Английский