Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X2524
Acta Limnologica Brasiliensia
Artigo Original

Diel dynamics and environmental influences on phytoplankton communities in an Andean lagoon: implications for management and conservation

Dinâmica diária e influencia ambiental sobre a comunidade fitoplanctônica em uma lagoa Andina: implicações para o manejo e conservação

Ivan Edward Biamont-Rojas; Herminio René Alfaro-Tapia

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Abstract

Aim: Lacustrine environments are unique locations to study temporal fluctuations derived from natural and artificial sources within a hydrographic basin. The objective of this study was to analyze the diel cycle of physicochemical parameters and their influence on the phytoplankton community structure in open waters, as well as, to evaluate the total phosphorus and nitrogen contents in the vicinity of fish tanks in the lagoon, and to identify the phytoplankton assemblage in the water column in a diel cycle in an open water area during the rainy and dry seasons.

Methods: The epilimnion and hypolimnion zones of an open water area were assessed over 24 hours, starting at 10:00 on day one and finishing at 10:00 on day two, obtaining a total of 36 samples (9 samples at 3-hour intervals, in two lake zones, in two seasons). Sampling employed a Van Dorn sampling bottle, and the Morphologically Based Functional Groups (MBFG), Shannon-Weaver and Simpson Indices were employed to describe the identified genera.

Results: Six of the seven parameters monitored registered higher values during the rainy season; only transparency was higher during the dry season. Fifteen genera distributed in nine classes were identified, with richness and diversity being higher in the rainy season.

Conclusions: The MBFG and sinking properties of group and genera has influenced the vertical migration of phytoplankton. The daily cycle method effectively captured the fluctuations in physicochemical and phytoplankton parameters over a 24-hour period in both seasons in Chacas Lagoon.

Keywords

Ceratium; daily cycle; Lake Titicaca basin; MBFG; vertical migration

Resumo

Objetivo: Ambientes lacustres são locações únicas para estudar as flutuações temporais derivadas de fontes naturais e artificiais dentro uma bacia hidrográfica. O objetivo deste estudo é analisar o ciclo diário dos parâmetros físico-químicos e sua influência na estrutura da comunidade fitoplanctônica em águas abertas, bem como, avaliar o conteúdo de fosforo e nitrogênio total nas proximidades de tanques de peixes na lagoa, e identificar a comunidade fitoplanctônica na coluna da água num ciclo diário em águas abertas durante a época de chuva e seca.

Métodos: O epilimnion e hipolimnion em água aberta foi avaliada durante 24 horas, começando às 10:00 do dia um e terminando às 10:00 do dia dois, obtendo 36 amostras no total (9 amostras em um intervalo de três horas em duas zonas lacustres em duas épocas sazonais). A amostragem foi realizada com uma garrafa tipo Van Dorn, e a classificação funcional do fitoplâncton baseada na morfologia (MBFG - Morphologically Based Functional Groups), Indice de Shannon-Weaver e Simpson foram utilizadas para descrever os gêneros identificados.

Resultados: Seis dos sete parâmetros monitorados registraram valores mais altos durante a época de chuva; somente a transparência foi maior durante a época seca. Quinze gêneros distribuídos em nove classes foram identificados, com uma riqueza e diversidade maior na época de chuva.

Conclusões: A classificação MBFG e as propriedades de afundamento para cada grupo e gênero influenciaram a migração vertical do fitoplâncton. O método do ciclo diário capturou efetivamente as flutuações dos parâmetros físico-químicos e do fitoplâncton ao longo de um período de 24 horas em ambas as épocas na Lagoa Chacas.

Palavras-chave

Ceratium; MBFG; ciclo diário; bacia do Lago Titicaca; migração vertical

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Submitted date:
03/18/2024

Accepted date:
10/08/2024

Publication date:
11/20/2024

673e3aa3a9539501e813dc53 alb Articles
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Acta Limnol. Bras. (Online)

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