Municipal Lake governance Developments in Latvia: Towards Complex Approach Management Practice

Latvia has a significant number of lakes, even eventually more as 10 000 as they never been fully accounted, but just comparatively small number are subject to lake governance, since the entire national lake governance system is still under development and currently mostly municipalities themselves are step-wise developing and realising lake management plans, but municipal capacities vary significantly. According to EU Water framework directive, there are four river basin management systems established in Latvia, having related water and risk management documents in place, as well as, in the past decade, there have been both national and regional level planning guidelines developed for lake and river waterbodies management, but all mentioned has been not yet utilized in local practice, having some legal responsibilities’ and admin capacities’ deficiencies. Despite this, there has been seen slow improvement of the water quality and socio-economic usage of lakes, but more in the lake management practice is to be done, accounting also for climate change. The goal of this research was to study the municipal level lake management practice developments, applying general research-and-development (R&D) framework approach and researching particularly the status and development trends of the three governance’s dimensions’ employment – governance content by socio-ecological system (SES) approach, governance segments as for main stakeholders’ involvement and participation, as well as, the set of governance instruments, especially, institutional/administrative ones. There were chosen pilot municipalities, having diverse and successful lake management approaches utilised, and, for the first study stage, document analysis and semi-structured interviews with related municipal specialists were done, using case study research (CSR) methodology application. There were recognized five lake management approaches, even in most municipalities in Latvia, particularly in rural ones, lake management is traditionally done by the scarce municipal territory administrative units and Utilities departments/services, and, only limited number of municipalities, also particularly studied, have developed and are employing for lake management also nature resource/environmental departments, while only in few municipalities there are established special municipal lake management agencies. Promising looks NGO sector management approach used by some municipalities, both top-down either bottom-up establishment chosen to apply, but as most perspective could be recognised complex approach (cross-sector) management practice, where most or all above mentioned approaches are combined and complementary supporting each other, within particular municipality. All studied municipalities possess certain lake management success stories, to be studied further in very detail, however, in general, there is to be seen still limited understanding and utilisation of the SES approach, also still potential of various stakeholder’s involvement and pro-active development of all complementary governance instruments, even many of instruments are available in studied municipalities, but lake communication instruments (information, education/training, participation and lake-friendly behaviour) are mostly underdeveloped.

Desmids (Zygnematophyceae) from the littoral zone of an urban artificial lake: taxonomic aspects and geographical distribution

Aim: The aim of this study was to assess the taxonomic aspects and geographical distribution of the periphytic desmids from two different substrates in the littoral zone of an urban artificial lake. Methods Samples of epiphytic and epilithic desmids were collected by grass and rock scraping, respectively, in two stations in the Cascavel municipal lake, Paraná, during April 2015, and March 2016 and 2017. In the laboratory, the taxa obtained from the samples were photographed and their morphometric characteristics recorded. The species composition of the desmid was characterized, and the frequency of occurrence as well as the geographic distribution of each taxon in the Paraná State were recorded. Results We identified 35 taxa, distributed in 10 genera. The most representative were Closterium Nitzsch ex Ralfs and Cosmarium Corda ex Ralfs. A high occurrence of sporadic taxa (60%) was observed and among the recorded taxa, the most frequent were Cosmarium pseudoconnatum Nordstedt var. pseudoconnatum and Desmidium grevillei (Kützing ex Ralfs) De Bary. Nine taxa were exclusive to the epilithic substrate and only Netrium digitus (Ralfs) Itzigsohn & Rothe var. digitus was exclusive to the epiphytic substrate, while the remaining 25 taxa occurred in both substrates. Seven taxa are new records for the Paraná State. Conclusion Although our results are of qualitative nature, they provide baseline data on the biogeographic distribution of taxa, which are crucial for future taxonomic and ecological studies that might contribute to the preservation of the biodiversity.

Analysis of metal concentration levels in water, sediment and fish tissues from Toledo municipal lake by applying SR-TXRF technique

The main objective of this study was to evaluate the metal content in water and sediment from the Toledo municipal lake, as well as the concentration levels of heavy metals in muscle and liver of four fish species. A digestion procedure was performed in all fish samples. Metal analysis was performed by using the Synchrotron Radiation X-ray Fluorescence technique. The accuracy and validity of the measurements were determined by analysis of certified reference materials. The highest Cr, Cu and Se concentration levels above the maximum tolerance limit according to the Brazilian norms in fish tissue could be associated with the metal uptake and accumulation due to the direct contact with contaminated water and sediment.