Ecoregional Characteristics Drive the Distribution Patterns of Neotropical Stream Diatoms.
Colombia
Humboldt
algae
community assembly
historical process
temperature
Journal
Journal of phycology
ISSN: 1529-8817
Titre abrégé: J Phycol
Pays: United States
ID NLM: 9882935
Informations de publication
Date de publication:
08 2020
08 2020
Historique:
received:
30
10
2019
accepted:
28
03
2020
pubmed:
23
4
2020
medline:
4
2
2021
entrez:
23
4
2020
Statut:
ppublish
Résumé
We assessed the relative influence of ecoregional features in explaining diatom distribution in the Orinoco river basin. Ecoregions in the Colombian Orinoco can be seen as imprints of the evolutionary history of the basin, for their current biodiversity and physiographic features are the result of the geological and climatic shifts that have occurred since the Tertiary. Thus, they represent an ideal testing ground for studying the interplay between ecological and evolutionary processes shaping diversity patterns of microorganisms, such as diatoms, in the present day. To study this interplay, we compared diatom community composition variance within and among seven ecoregions and assessed the explanatory power of environmental, spatial and historical drivers. This was done by a combination of correlation analyses, multivariate methods and constrained ordinations. We also deconstructed the whole community data set into ecological guilds (low- and high-profile, and motile) to explore their individual response to the contemporary and historical drivers. Taken together, these analyses indicated that contemporary constraints to species occurrence and dispersal, as well as the legacies of historical events, can provide an explanation for the contemporary distribution of diatoms in the Colombian Orinoco. Specifically, we provided evidence showing that both historical legacies and contemporary environmental conditions (temperature, pH, and phosphorus concentration) are interacting to determine diatoms' distribution. Our results suggest the need to consider ecoregional gradients for unraveling the mechanisms shaping tropical diversity as well as for designing conservation plans.
Substances chimiques
Phosphorus
27YLU75U4W
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1053-1065Subventions
Organisme : Secretariat of Universities and Research from Generalitat de Catalunya
Pays : International
Organisme : European Social Fund
ID : 2019 FI_B1 00210
Pays : International
Organisme : CERCA
Pays : International
Organisme : Dirección de Investigación Sede Bogotá
Pays : International
Organisme : Universidad Nacional de Colombia
ID : 34856
Pays : International
Organisme : Departamento Administrativo de Ciencia, Tecnología e Innovación
Pays : International
Informations de copyright
© 2020 Phycological Society of America.
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