Drivers of compositional turnover of narrow-ranged versus widespread naturalised woody plants in South Africa DOI Creative Commons
Isabella W. de Beer, Cang Hui, Christophe Botella

et al.

Frontiers in Ecology and Evolution, Journal Year: 2023, Volume and Issue: 11

Published: Feb. 21, 2023

Introduction Alien trees and shrubs have become increasingly common invaders globally caused major negative impacts to ecosystems society. Non-native woody plant species make up the majority of legislated invasive alien taxa in South Africa contribute substantially recorded impacts. It is management interest elucidate macroecological processes that mediate assembly taxa, as this expected be associated with anthropogenic factors (e.g., human activity, introduction events, pathways propagule dispersal mediated by humans) bioclimatic (such diurnal temperature range precipitation gradients). These analyses require large species-occurrence datasets comprehensive sampling across broad environmental conditions. Efforts citizen scientists produce numbers occurrence records a consistent manner which may utilised for scientific investigations. Methods Research Grade data on naturalised plants were extracted from scientist platform iNaturalist. Sampling bias was mitigated using statistical modelling background points estimated Target Group identifies well sampled communities. The drivers at different sizes identified multi-site generalised dissimilarity (MS-GDM) zeta diversity. predicted compositional similarity between all cells computed based subset communities (GDM). From this, bioregions k-means cluster analysis. Results Discussion Bioclimatic significantly influenced community turnover inland areas ranges, high precipitation. Communities separated geographical distances had compositions, indicating little contribution long-range movement humans, presence localised hubs within country harbour unique compositions. Analyses also showed significant road density turnover, moderated habitat service provided verges. same true natural via rivers arid areas. distribution tree shrub geographically clustered forms six are distinct African biomes defined native distributionanalysis.

Language: Английский

Species that dominate spatial turnover can be of (almost) any abundance DOI Creative Commons
David C. Deane, Cang Hui, Mélodie A. McGeoch

et al.

Ecography, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

An ongoing quest in ecology is understanding how species commonness influences compositional change. While each species' contribution to beta diversity (SCBD) depends both on its abundance and widespread it (e.g. occupancy) a general expectation for these lacking. Using published data 9924 across 177 metacommunities, we modelled relative SCBD as function of occupancy using correlative mechanistic regression models (the latter derived from population demographic theory). Although the model provided superior fit data, results suggest with infrequent combinations (high mid‐high that make dominant diversity. The nature their interaction most apparent when depicted abundance–occupancy sample space, which shows probability making concave‐up abundance. Species found an intermediate number sites (0.56) required smallest share total (0.05) top‐decile contribution. Simulations varying evenness conspecific spatial patterns support main findings show variations strength aggregation predominantly result observed relationship between space illustrates empirical abundance‐SCBD relationships can be linear or unimodal provides framework understand global change processes. To preserve turnover, should prioritized.

Language: Английский

Citations

0
Environmental and landscape changes drive medium- to large-bodied mammal species composition across an Amazon-Cerrado ecotone amid the deforestation expansion DOI
Juliano André Bogoni, Robson Flores de Oliveira, Manoel dos Santos Filho

et al.

Mammalia, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

Abstract Amazon and Cerrado biomes embrace a vast parcel of Brazilian biodiversity, yet remain understudied in terms species diversity distribution, particularly transitional zones. We investigated the patterns distribution multiples facets medium- to large-bodied mammal across ecotonal Guaporé river basin, including relationship biodiversity variations according landscape-scale features, such as forest remnants agribusiness. sampled fauna via camera-trapping census, six independent sites, totalling sampling effort 540 camera-trap-days 720 h census. also extracted covariables further predicts variation mammalian diversity. Our results revealed that all sites have similar richness, whereas zeta-diversity decline ∼90 % when were compared. Differences richness – even inconspicuous decay shared can be associated environmental gradient distance among evidencing faunistic transictions prompted by rarity endemism regions human-induced landscape changes. The beta-diversity caused turnover-type structure, once ∼66 balanced composition was due changes gradient. Considering imminent threats natural habitats, it is crucial prioritize conservation any habitat given gamma depends on quantity native areas. This strategy serves fundamental cornerstone for maximizing overall tropical forests.

Language: Английский

Citations

0
Drivers of compositional turnover in narrow‐ranged and widespread dragonflies and damselflies in Africa DOI Creative Commons
Ashleigh Basel, John P. Simaika, Michael J. Samways

et al.

Insect Conservation and Diversity, Journal Year: 2024, Volume and Issue: 17(3), P. 501 - 511

Published: Feb. 6, 2024

Abstract We aim to explore what processes dominate community assembly of dragonflies (Odonata: Anisoptera) and damselflies Zygoptera) by differentiating the environmental geographical drivers behind compositional turnover narrow‐ranged versus widespread species. In this way, we further describe patterns species incidence expand upon body knowledge related understanding biodiversity processes. explored separately, using zeta diversity measure among multiple assemblages. Narrow‐ranged within each suborder showed similar drivers. Specifically, both show rapid with small shifts in annual mean temperature, temperature seasonality precipitation, whereas for damselflies, major driver is distance between sites followed climatic variables. Our results therefore that odonate largely driven climate, although limited dispersal capabilities also influences assembly. Climate change could cause changes composition odonates, presenting a challenge conservation planning Africa as assemblages were previously conserved may no longer be protected if their ranges shift outside areas. For adaptation concern, climate sensitivity, they not able migrate effectively response changing conditions. The underlying do differ considerably suborder, suggesting tailored sufficient Africa.

Language: Английский

Citations

3
Two dominant forms of multisite similarity decline – Their origins and interpretation DOI Creative Commons
David C. Deane, Cang Hui, Mélodie A. McGeoch

et al.

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(3)

Published: March 1, 2023

Abstract The number of species shared by two or more sites is a fundamental measure spatial variation in composition. As are included the comparison composition, average across them declines, with rate increasingly dependent on only most widespread species. In over 80% empirical communities, models decline multiple (multisite similarity decline) follow one distinct forms. An exponential form assumed to reflect stochastic assembly and power law niche‐based sorting, yet these explanations largely untested, little known how forms arise nature. Using simulations, we first show that distribution differentiates forms, favored where such occupy than ~75% sites. We reasoned less cosmopolitan within communities would manifest as differences community biodiversity properties, specifically aggregated within‐species distributions, even relative abundance weaker between‐species associations. tested confirmed relationships using 80 datasets, suggesting multisite offers basis predict landscape‐scale loss gain reflected different local‐scale structures. Such understanding could, for example, be used changes competitive interactions following shifts species' distributions. propose origin decline, including high among‐site abiotic variation, sampling highly specialized (narrow niche width) taxa, strong dispersal limitation. recommend evaluated alternative hypotheses assembly.

Language: Английский

Citations

5
Drivers of compositional turnover of narrow-ranged versus widespread naturalised woody plants in South Africa DOI Creative Commons
Isabella W. de Beer, Cang Hui, Christophe Botella

et al.

Frontiers in Ecology and Evolution, Journal Year: 2023, Volume and Issue: 11

Published: Feb. 21, 2023

Introduction Alien trees and shrubs have become increasingly common invaders globally caused major negative impacts to ecosystems society. Non-native woody plant species make up the majority of legislated invasive alien taxa in South Africa contribute substantially recorded impacts. It is management interest elucidate macroecological processes that mediate assembly taxa, as this expected be associated with anthropogenic factors (e.g., human activity, introduction events, pathways propagule dispersal mediated by humans) bioclimatic (such diurnal temperature range precipitation gradients). These analyses require large species-occurrence datasets comprehensive sampling across broad environmental conditions. Efforts citizen scientists produce numbers occurrence records a consistent manner which may utilised for scientific investigations. Methods Research Grade data on naturalised plants were extracted from scientist platform iNaturalist. Sampling bias was mitigated using statistical modelling background points estimated Target Group identifies well sampled communities. The drivers at different sizes identified multi-site generalised dissimilarity (MS-GDM) zeta diversity. predicted compositional similarity between all cells computed based subset communities (GDM). From this, bioregions k-means cluster analysis. Results Discussion Bioclimatic significantly influenced community turnover inland areas ranges, high precipitation. Communities separated geographical distances had compositions, indicating little contribution long-range movement humans, presence localised hubs within country harbour unique compositions. Analyses also showed significant road density turnover, moderated habitat service provided verges. same true natural via rivers arid areas. distribution tree shrub geographically clustered forms six are distinct African biomes defined native distributionanalysis.

Language: Английский

Citations

2