TY  - JOUR
A1  - Fonte, Luis Fernando Marin da
A1  - Latombe, Guillaume
A1  - Gordo, Marcelo
A1  - Menin, Marcelo
A1  - de Almeida, Alexandre Pinheiro
A1  - Hui, Cang
A1  - Lötters, Stefan
T1  - Amphibian diversity in the Amazonian floating meadows: a Hanski core-satellite species system
T2  - ECOGRAPHY
N2  - The Amazon catchment is the largest river basin on earth, and up to 30% of its waters flow across floodplains. In its open waters, floating plants known as floating meadows abound. They can act as vectors of dispersal for their associated fauna and, therefore, can be important for the spatial structure of communities. Here, we focus on amphibian diversity in the Amazonian floating meadows over large spatial scales. We recorded 50 amphibian species over 57 sites, covering around 7000 km along river courses. Using multi-site generalised dissimilarity modelling of zeta diversity, we tested Hanski's core-satellite hypothesis and identified the existence of two functional groups of species operating under different ecological processes in the floating meadows. ‘Core' species are associated with floating meadows, while ‘satellite' species are associated with adjacent environments, being only occasional or accidental occupants of the floating vegetation. At large scales, amphibian diversity in floating meadows is mostly determined by stochastic (i.e. random/neutral) processes, whereas at regional scales, climate and deterministic (i.e. niche-based) processes are central drivers. Compared with the turnover of ‘core' species, the turnover of ‘satellite' species increases much faster with distances and is also controlled by a wider range of climatic features. Distance is not a limiting factor for ‘core' species, suggesting that they have a stronger dispersal ability even over large distances. This is probably related to the existence of passive long-distance dispersal of individuals along rivers via vegetation rafts. In this sense, Amazonian rivers can facilitate dispersal, and this effect should be stronger for species associated with riverine habitats such as floating meadows.
KW  - Amazonas-Gebiet
KW  - Feuchtwiese
KW  - Lurche
KW  - Verbreitung
Y1  - 2021
UR  - https://ubt.opus.hbz-nrw.de/frontdoor/index/index/docId/1855
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:385-1-18550
VL  - 2021
IS  - Band 44, Heft 9 (2021)
SP  - 1325
EP  - 1340
PB  - Wiley
CY  - Hoboken, New Jersey
ER  -