Journal ArticleDOI
The importance of species pool size for community composition
Dirk Nikolaus Karger,Dirk Nikolaus Karger,Hanna Tuomisto,Victor B. Amoroso,Dedy Darnaedi,Arief Hidayat,Stefan Abrahamczyk,Stefan Abrahamczyk,Jürgen Kluge,Jürgen Kluge,Marcus Lehnert,Michael Kessler +11 more
TLDR
The idea that increasing species pool size increases the competition for available environmental niches, and thereby leads to a tighter connection between environmental factors and community composition is supported.Abstract:
We investigated if an increase in species pool size leads to more pronounced turnover in local communities and assessed if this increase relates to stronger competition for environmental niches or to more random placement of species. We compared compositional turnover of pteridophytes (ferns and lycophytes) at 15 sites in mountain ecosystems on 13 islands in southeast Asia and Melanesia that mainly differed in the size of their species pool. Each site was sampled with 16 plots of 20 × 20 m2. Using multiple regression on distance matrices, we investigated the relationship between environmental distance and compositional turnover at different spatial extents within sites with different species pool sizes. Additionally, we tested the hypothesis that the intensity of competition increases with increasing species pool size. This was done by assessing how realized niche overlap and unevenness of communities relate to environmental distance and species pool size. With increasing species pool size, there was an increase in: a) proportional turnover in community composition, b) the importance of environmental distance for explaining turnover in community composition and c) a decrease in environmental niche overlap between species indicating an increasing importance of competition for community composition. Our results support the idea that increasing species pool size increases the competition for available environmental niches, and thereby leads to a tighter connection between environmental factors and community composition.read more
Citations
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Journal ArticleDOI
Environmentally driven extinction and opportunistic origination explain fern diversification patterns
Samuli Lehtonen,Daniele Silvestro,Dirk Nikolaus Karger,Dirk Nikolaus Karger,Christopher R. Scotese,Hanna Tuomisto,Michael Kessler,Carlos Peña,Niklas Wahlberg,Niklas Wahlberg,Alexandre Antonelli +10 more
TL;DR: A novel Bayesian model is developed to simultaneously estimate correlations between diversification dynamics and multiple environmental trajectories and indicates that the prime driver of fern diversity dynamics is environmentally driven extinction, with origination being an opportunistic response to diminishing ecospace occupancy.
Journal ArticleDOI
Delineating probabilistic species pools in ecology and biogeography
Dirk Nikolaus Karger,Dirk Nikolaus Karger,Anna F. Cord,Michael Kessler,Holger Kreft,Ingolf Kühn,Ingolf Kühn,Sven Pompe,Brody Sandel,Juliano Sarmento Cabral,Adam B. Smith,Jens-Christian Svenning,Hanna Tuomisto,Patrick Weigelt,Karsten Wesche +14 more
TL;DR: It is demonstrated that probabilistic species pools allow us to disentangle the geographical variation in dispersal, environmental and biotic assembly processes for species assemblages in focal units and are fully compatible with traditional definitions of species pools.
Journal ArticleDOI
Compositional changes in bee and wasp communities along Neotropical mountain altitudinal gradient.
TL;DR: High occurrence of singleton and doubleton species at all altitudes is found, highlighting the need for long-term studies to efficiently assess hymenopteran diversity in these environments.
Journal ArticleDOI
We should not necessarily expect positive relationships between biodiversity and ecosystem functioning in observational field data.
TL;DR: In this paper, the authors review ecological theory and re-analyse several biodiversity datasets to argue that ecosystem function correlations with local diversity in observational field data are often difficult to interpret in the context of biodiversity-ecosystem function research and suggest that even without local biodiversity declines, biodiversity loss at regional scales-which determines local species pools-may still negatively affect ecosystem functioning.
Journal ArticleDOI
Global fern and lycophyte richness explained: How regional and local factors shape plot richness
Anna Weigand,Stefan Abrahamczyk,Isabelle Aubin,Claudia Bita-Nicolae,Helge Bruelheide,César I. Carvajal-Hernández,Daniele Cicuzza,Lucas Costa,János Csiky,Jürgen Dengler,Jürgen Dengler,André Luís de Gasper,Greg R. Guerin,Sylvia Haider,Adriana Hernández-Rojas,Ute Jandt,Johan Reyes-Chávez,Dirk Nikolaus Karger,Phyo Kay Khine,Jürgen Kluge,Thorsten Krömer,Marcus Lehnert,Marcus Lehnert,Jonathan Lenoir,Gabriel M. Moulatlet,Daniela Aros-Mualin,Sarah Noben,Ingrid Olivares,Luis G. Quintanilla,Peter B. Reich,Peter B. Reich,Laura Salazar,Libertad Silva-Mijangos,Hanna Tuomisto,Patrick Weigelt,Gabriela Zuquim,Holger Kreft,Michael Kessler +37 more
TL;DR: In this paper, the influence of environmental factors at different spatial grains (regional and local) on fern and lycophyte species richness and how regional and plot-level richness are related to each other was disentangled.
References
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