SciELO - Scientific Electronic Library Online

 
vol.33 issue4Updates on extratropical region climbing plant flora: news regarding a still-neglected diversityGenetic diversity in Calibrachoa pygmaea (Solanaceae): A hawkmoth-pollinated nightshade from the Pampas author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Acta Botanica Brasilica

Print version ISSN 0102-3306On-line version ISSN 1677-941X

Abstract

SILVA, Luiza Nicoleite da; MEDEIROS, Caroline Modena de; CAVALCANTE, Kaoli Pereira  and  CARDOSO, Luciana de Souza. Invasion and establishment of Ceratium furcoides (Dinophyceae) in an urban lake in Porto Alegre, RS, Brazil. Acta Bot. Bras. [online]. 2019, vol.33, n.4, pp.654-663.  Epub Oct 07, 2019. ISSN 0102-3306.  https://doi.org/10.1590/0102-33062018abb0429.

Ceratium furcoides has received attention due its invasive behavior in South America and consequent alterations in local phytoplankton communities. Pedalinhos Lake had been dominated by chlorophytes until 2015, when the first occurrence of this dinoflagellate was detected. In order to investigate the colonization process of this species, we monitored the meteorological variables and phytoplankton abundance of this urban lake on a weekly basis from September 2015 to September 2018. At the beginning of the invasion process (Year 1), a peak density of 10,170 ind.mL-1 was recorded, with a significant decrease to 23 ind.mL-1, indicating an initial, unstable process of adaptation, with notable oscillation and reduction of cyanobacterial blooms. At this time, abundance of C. furcoides revealed inverse correlations with cyanobacteria, temperature, and insolation. InYear 2 therewere a stabilization of the density of C. furcoides accompanied by increased cell size. Year 3 (starting in September 2017) was again marked by oscillations in the density of this dinoflagellate. This study contributes to improved understanding of the adaptation process of this dinoflagellate in an invaded environment and its effects on the local phytoplankton community.

Keywords : dinoflagellate; invasive species; shallow lake; subtropical; Southern Brazil.

        · text in English     · English ( pdf )