Environmental filters influencing phytoplankton taxonomic structure in cascade reservoirs
- PDF / 1,220,803 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 33 Downloads / 171 Views
ORIGINAL ARTICLE
Environmental filters influencing phytoplankton taxonomic structure in cascade reservoirs Jascieli Carla Bortolini1 · Pedro Rogério Leandro da Silva2 · Gilmar Baumgartner3 · Norma Catarina Bueno4 Received: 1 November 2019 / Revised: 2 March 2020 / Accepted: 25 March 2020 © Botanical Society of Sao Paulo 2020
Abstract In this study we analyzed the dynamics of the phytoplankton community in two cascade reservoirs in six sampling periods, to investigate the influence of environmental filters on phytoplankton, and the community concordance with the environ‑ mental variability. We addressed several questions, and from phytoplankton biomass data and abiotic variables sampled at the Salto Osório and Salto Santiago reservoirs, Paraná, Brazil, we obtained the answers. A total of 136 taxa distributed in cyanobacteria, diatoms, green algae and mixotrophic flagellates were recorded. Diatoms and mixotrophic flagellated algae contributed most of the phytoplankton biomass in both reservoirs. Environmental filters such as nutrient concentrations, light, pH, depth and temperature had the greatest influence on phytoplankton taxonomic structure, being the community in concordance with the environmental conditions. Although some environmental differences between reservoirs were recorded, the phytoplankton community was similar, probably associated with environmental connectivity, but with differences in biomass, which is possibly associated with seston retention in upstream regions. Our results revealed important drivers that influence the phytoplankton structure and dynamics in reservoirs, and this understanding is of interest, due to the maintenance of ecosystem functions and services. Keywords Biomass · Impoundment · Planktonic algae · Subtropical reservoir
1 Introduction Global biodiversity is changing rapidly as a response to human influence on ecosystems, and the need to address the extent of these changes, their drivers and the conse‑ quences for ecosystem functioning is extremely relevant in current scenarios (Hillebrand et al. 2018). Among the main
* Jascieli Carla Bortolini [email protected] 1
Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Avenida Esperança, s/n, Goiânia, Goiás 74690‑900, Brazil
2
Instituto Neotropical de Pesquisas Ambientais (INEO), Rua Guaíra, 2006, Toledo, Paraná 85902‑140, Brazil
3
Grupo de Pesquisas em Recursos Pesqueiros e Limnologia (GERPEL), Universidade Estadual do Oeste do Paraná, Rua da Faculdade, 645, Toledo, Paraná 85903‑000, Brazil
4
Programa de Pós‑graduação em Conservação e Manejo de Recursos Naturais, Universidade Estadual do Oeste do Paraná, Rua Universitária, 2019, Cascavel, Paraná 85819‑110, Brazil
anthropogenic impacts on aquatic ecosystems is the reser‑ voir construction, which has been identified as an important factor of biodiversity alteration (Winemiller et al. 2016). However, the effects of these constructions depend on the characteristics of barred rivers, and should be studied indi‑ vidually (A
Data Loading...