Driving factors affecting the phytoplankton functional groups in a deep alkaline lake

Oğuz, Ayça; Akçaalan, Reyhan; Köker, Latife; Gürevin, Cenk; Dorak, Zeynep

doi:10.3906/bot-2004-33

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…As a result of changing environmental conditions, the increasing presence of harmful algal blooms is an emerging issue (Akcaalan et al 2009;Albay et al 2003;Mariani et al 2015;Wan et al 2020). Several species of Microcystis, Anabaena, Dolichospermum, Cylindrospermopsis, Aphanizomenon, and Nodularia are known to dominate blooms in Turkiye (Albay et al 2005(Albay et al , 2009Koker et al 2021;Oğuz et al 2020). As regards the health risks associated with these groups, the guidelines for cyanobacterial toxins were prepared for drinking and recreational waters (Anonim 2019a;2019b).…”

Section: Introductionmentioning

confidence: 99%

Cyanobacterial Diversity and the Presence of Microcystins in the Küçük Menderes River Basin, Turkey

Köker¹,

Çam²,

Akçaalan³

et al. 2022

ase

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Although cyanobacteria are commonly associated with eutrophic lakes, they are the basic components of phytoplankton communities in lakes that have different trophic statuses. In inland waters, both nutrient loading from watersheds and warmer conditions promote phytoplankton growth and cause extensive cyanobacterial blooms. Certain bloom-forming cyanobacterial species can pose a health risk to humans and aquatic ecosystems through cyanotoxin production. The aim of this study was to evaluate the cyanobacterial composition and toxins in five reservoirs and two natural lakes in the Küçük Menderes River Basin, all with varying trophic statuses. Within this scope, samples were collected in autumn 2017 and spring 2018. Cyanobacterial species were enumerated according to the Utermöhl method. Cyanotoxin samples were analyzed using HPLC. To find the trophic status of the water bodies, the Trophic State Index (TSI) developed by Carlson (1977) was used and Total Phosphorus (TP), Secchi Depth (SD), and Chlorophyll-ɑ (chl-ɑ) measurements were performed. Cyanobacterial abundance, species composition, and cyanotoxin production differed significantly between the lakes and reservoirs. A total of 13 cyanobacteria species were identified including potential cyanotoxin producers such as Microcystis, Aphanizomenon, and Dolichospermum. According to the TSI, three reservoirs were mesotrophic and the other four waterbodies had eutrophic-hypereutrophic conditions. Microcystis is the most common bloom-forming freshwater cyanobacteria in the Küçük Menderes River Basin. However, microcystin concentrations were relatively low and the highest microcystin concentration was detected in the Tahtalı Reservoir at 9 µg/L. The Küçük Menderes River Basin is under water-stressed conditions and the cyanobacteria blooms in the region might pose another threat for wildlife and humans.

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Section: Introductionmentioning

confidence: 99%

Cyanobacterial Diversity and the Presence of Microcystins in the Küçük Menderes River Basin, Turkey

Köker¹,

Çam²,

Akçaalan³

et al. 2022

ase

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Environmental factors affecting the spatio-temporal distribution of zooplankton functional groups in a deep alkaline lake

Dorak,

Gaygusuz,

Köker

et al. 2024

Hydrobiologia

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In recent years, trait-based studies have gained importance as an extension of taxonomic studies to better understanding ecosystem processes. However, these studies are still very limited in Mediterranean freshwaters. The aim of the study was to link functional groups with environmental factors and ecosystem processes for zooplankton in the Lake Iznik, which is an alkaline lake in Türkiye. Morphological, physiological and behavioural categories have been selected as response traits. Physical and chemical variables and trophic state are important predictors of functional traits. A total of 26 zooplankton taxa belonging to four taxonomic groups were classified into five functional groups according to functional traits. It was found that functional groups were significantly affected by seasonally changing environmental conditions, but not by depth. The main predictor of zooplankton functional groups was electrical conductivity. As a result of the alkaline conditions and the deterioration of the trophic state of the lake (meso ~ to eutrophy), the low taxonomic richness, dominance of the microphagous feeding type and small-bodied taxa indicate ecosystem degradation leading to functional depletion (homogenisation). The results showed that temporal variations of environmental variables can affect zooplankton functional groups and that trait-based zooplankton studies will enable a better understanding of ecosystem processes in deep alkaline lakes.

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Depth profiles of protein-bound microcystin in Küçükçekmece Lagoon

Köker

Akçaalan

Dittmann

et al. 2021

Toxicon

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Driving factors affecting the phytoplankton functional groups in a deep alkaline lake

Cited by 5 publications

References 26 publications

Cyanobacterial Diversity and the Presence of Microcystins in the Küçük Menderes River Basin, Turkey

Cyanobacterial Diversity and the Presence of Microcystins in the Küçük Menderes River Basin, Turkey

Environmental factors affecting the spatio-temporal distribution of zooplankton functional groups in a deep alkaline lake

Depth profiles of protein-bound microcystin in Küçükçekmece Lagoon

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