Increasing depth reduces macrophyte coverage but increasing transparency promotes composition turnover through environmental thresholds
Yasmin M. Canalli
A * , Bruno E. Soares B and Cassia M. Sakuragui A
+ Author Affiliations
- Author Affiliations
A Departamento de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
B Department of Biological Sciences, University of Toronto—Scarborough, Toronto, ON, Canada.
Marine and Freshwater Research 74(2) 157-163 https://doi.org/10.1071/MF22097
Submitted: 3 May 2022 Accepted: 8 December 2022 Published: 17 January 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Environmental filters modify the coverage and frequency patterns of macrophyte communities.
Aims: We characterised the thresholds in depth and transparency at which the macrophyte distribution shifted in an Atlantic Forested wetland.
Methods: Macrophyte communities were characterised in 150 plots divided into 6 transects.
Key results: Threshold indicator taxa analysis (TITAN) indicated that free-floating life forms respond negatively to depth and transparency increase. Rooted-floating species responded negatively to an increase in depth and transparency; by contrast, submerged species responded positively to increased transparency.
Conclusion: TITAN also highlighted that the entire macrophyte community responded negatively to increased depth but exhibited a synchronous turnover among species responding positively and negatively to transparency.
Implications: Our results demonstrated that macrophyte responses to increasing depth and transparency are non-linear and depend on species life forms.
Keywords: abiotic factors, aquatic plant, environmental filter, floodplain, hydrophyte, life forms, threshold responses, wetland.
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