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Relationships of environmental conditions and phytoplankton functional groups in a new re-constructed shallow lentic system in draught conditions

D. Latinopoulos,C. Ntislidou,I. Kagalou

Published 2020 in Ecohydrology and Hydrobiology

ABSTRACT

Abstract Spatial and temporal patterns are determined by a variety of biotic and abiotic conditions, among all in shallow, Mediterranean, heavily modified water bodies. Lake Karla's, a multi-service reservoir, re-establishment begun 60 years after the natural lake was dried. This research is aimed at linking a series of environmental drivers with the phytoplankton functional groups during a dry year after the lake's refilling period, to investigate seasonal and spatial dynamics, and to get an insight into lake's ecology for both monitoring and management purposes. In situ physical and chemical measurements, along with water and plankton sampling took place monthly from May 2014 till March 2015. A combination of direct ordination, multivariate statistical analyses and distance-based approaches were used to examine spatial and temporal patterns and to test dissimilarities among and within the stations. Phytoplankton was assorted in Reynolds’ functional groups. The lake's hydrology was also modelled. The research results presented Karla lake as a homogeneously degraded system. The major environmental parameters affecting phytoplankton community were ortho-phosphates and temperature in a lake with long retention time. The five functional groups that were dominant during the survey were comprised by representatives of cyanobacteria, followed by chlorophytes and diatoms, many of them indicative of warm, shallow, turbid, nutrient-rich waters. Phytoplankton revealed a seasonal trend with prolonged summer, low differentiation among seasons and uninterrupted winter succession. The relations and patterns found are useful for monitoring, as for management purposes to enhance the reservoir's capacity.

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