scholarly journals A phytosociological survey of aquatic vegetation in the main freshwater lakes of Greece

2020 ◽  
Vol 1 ◽  
pp. 53-75
Author(s):  
Dimitrios Zervas ◽  
Ioannis Tsiripidis ◽  
Erwin Bergmeier ◽  
Vasiliki Tsiaoussi
Keyword(s):  
Plant Communities ◽  
Aquatic Plant ◽  
Aquatic Vegetation ◽  
Environmental Parameters ◽  
Hierarchical Cluster ◽  
Freshwater Lake ◽  
Vegetation Types ◽  
Freshwater Lakes ◽  
Lake Ecosystems ◽  
The Relationship

Aims: This study aims to contribute to the knowledge of European freshwater lake ecosystems with updated and new information on aquatic plant communities, by conducting national-scale phytosociological research of freshwater lake vegetation in Greece. Moreover, it investigates the relationship between aquatic plant communities and lake environmental parameters, including eutrophication levels and hydro-morphological conditions. Study area: Lakes in Greece, SE Europe. Methods: 5,690 phytosociological relevés of aquatic vegetation were sampled in 18 freshwater lake ecosystems during 2013–2016. The relevés were subjected to hierarchical cluster and indicator species analyses in order to identify associations and communities of aquatic vegetation, as well as to describe their syntaxonomy. Multiple regression analysis was applied to investigate the relationship between vegetation syntaxa and environmental parameters of lakes, i.e. physico-chemical parameters and water level fluctuation. Results: Ninety-nine plant taxa belonging to 30 different families were recorded. Forty-six vegetation types were identified and described by their ecological characteristics, diagnostic taxa and syntaxonomical status. Thirteen vegetation types, the largest number belonging to the vegetation class Charetea, are considered to be new records for Greece. The distribution of the vegetation types recorded in the 18 freshwater lakes was found to depend on environmental parameters and levels of eutrophication. Conclusions: An updated aquatic vegetation inventory was produced for Greek lakes, and primary results showed that the presence/absence of aquatic plant communities and the community composition in freshwater lakes can be utilized to assess the pressure of eutrophication on lake ecosystems. Taxonomic reference: Euro+Med (2006–). Abbreviations: MNT = Mean number of taxa; WFD = Water Framework Directive.

scholarly journals Principal Determinants of Aquatic Macrophyte Communities in Least-Impacted Small Shallow Lakes in France

2020 ◽  
Author(s):  
Frédéric Labat ◽  
Gabrielle Thiébaut ◽  
Christophe Piscart
Keyword(s):  
Surface Area ◽  
Plant Communities ◽  
Shallow Lakes ◽  
Aquatic Plant ◽  
Aquatic Macrophyte ◽  
Hierarchical Cluster ◽  
Morphological Data ◽  
Macrophyte Communities ◽  
Wide Scale ◽  
First Time

Small Shallow Lakes (SSL) support exceptionally high and original biodiversity, providing numerous ecosystem services. Their small size makes them especially sensitive to anthropic activities, that causes a shift to dysfunctional turbid states and induces loss of services and biodiversity. In this study we investigated the relationships between environmental factors and macrophyte communities. Macrophytes play a crucial role in maintaining functional clear states. Better understanding factors determining the composition and richness of aquatic plant communities in least-impacted conditions may be useful to protect them. We inventoried macrophyte communities and collected chemical, climatic and morphological data from 89 least-impacted SSL widely distributed in France. SSL were sampled across four climatic ecoregions, various geologies and elevations. Hierarchical cluster analysis showed a clear separation of four macrophyte assemblages strongly associated with mineralisation. Determinant factors identified by db-RDA analysis are, in order of importance, geology, distance from source (DIS, a proxy for connectivity with river hydrosystems), surface area, climate and hydroperiod (water permanency). Surprisingly, at country-wide scale, climate and hydroperiod filter macrophyte composition weakly. Geology and DIS are the major determinants of community composition, whereas surface area determines floristic richness. DIS is identified as determinant in freshwater lentic ecosystems for the first time.

The Relationship of Bog Stratigraphy to Climatic Change and Archaeology

1946 ◽  
Vol 12 ◽  
pp. 1-11 ◽  
Author(s):  
H. Godwin
Keyword(s):  
Climatic Change ◽  
Plant Communities ◽  
Aquatic Plant ◽  
Plant Remains ◽  
Relationship Of ◽  
Lake Deposits ◽  
The Relationship ◽  
Peat Stratigraphy

As a botanical field investigator for many years past interested in bogs and fens I have often had occasion to notice that these areas appeal very differently to different persons: to some I fear they do not appeal at all, and I fancy that many an archaeologist at heart prefers the dry chalk trench to the soaking black peat face. There are, however, such great advantages to be gained from the study of peat and lake-deposits in relation to archaeology that archaeologists increasingly realise the need for much fuller knowledge of the inherent character and properties of these deposits. Since such deposits are formed by the accumulation of plant-remains under water-logged conditions, and thus incorporate the remains of past generations of aquatic plant communities, it is evident that we shall need to consider the peat beds from the standpoint of the plant-ecologist already familiar with corresponding communities as they grow and form peat at the present day. It is therefore chiefly as an ecologist that I have sought to understand the problems offered by peat stratigraphy, and it is as such that I hope to convey something of the problems they concern.

scholarly journals The Distribution Pattern of Sediment Archaea Community of the Poyang Lake, the Largest Freshwater Lake in China

Archaea ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Yantian Ma ◽  
Fangpeng Liu ◽  
Zhaoyu Kong ◽  
Jianhua Yin ◽  
Wenbo Kou ◽  
...  
Keyword(s):  
Poyang Lake ◽  
Freshwater Lake ◽  
Considerable Influence ◽  
Freshwater Lakes ◽  
Community Structures ◽  
Lake Ecosystems ◽  
Main Lake ◽  
Sediment Microbes ◽  
Archaea Community

Archaea plays an important role in the global geobiochemical circulation of various environments. However, much less is known about the ecological role of archaea in freshwater lake sediments. Thus, investigating the structure and diversity of archaea community is vital to understand the metabolic processes in freshwater lake ecosystems. In this study, sediment physicochemical properties were combined with the results from 16S rRNA clone library-sequencing to examine the sediment archaea diversity and the environmental factors driving the sediment archaea community structures. Seven sites were chosen from Poyang Lake, including two sites from the main lake body and five sites from the inflow river estuaries. Our results revealed high diverse archaea community in the sediment of Poyang Lake, including Bathyarchaeota (45.5%), Euryarchaeota (43.1%), Woesearchaeota (3.6%), Pacearchaeota (1.7%), Thaumarchaeota (1.4%), suspended Lokiarchaeota (0.7%), Aigarchaeota (0.2%), and Unclassified Archaea (3.8%). The archaea community compositions differed among sites, and sediment property had considerable influence on archaea community structures and distribution, especially total organic carbon (TOC) and metal lead (Pb) (p<0.05). This study provides primary profile of sediment archaea distribution in freshwater lakes and helps to deepen our understanding of lake sediment microbes.

Aquatic vegetation (Lemnetea) in Baikal Siberia

2012 ◽  
pp. 106-132 ◽  
Author(s):  
V. V. Chepinoga ◽  
S. A. Rosbakh
Keyword(s):  
Numerical Methods ◽  
Plant Communities ◽  
Dominant Species ◽  
Aquatic Plant ◽  
Aquatic Vegetation ◽  
Irkutsk Region ◽  
Floating Plants

Communities of free floating plants in the reservoirs of Baikal Siberia (incl. Irkutsk Region, Republic of Burya­tia, Zabaikalsky Territory) are described. ­Using the Braun-Blanquet approach the classification of aquatic plant communities is developed. Eight associations have been identified, belonging to three alliances and three orders. The order Ceratophyllo–Hydrocharitetalia morsus-ranae Chepinoga et Rosbakh ord. nov. and the association Utricularietum macrorhizae Chepinoga et Rosbakh ass. nov. are described as new ones. The name of the association Lemno–Spirodeletum polyrhizae Koch 1954 is typified. Numerical methods for revealing and testing diagnostic, constant and dominant species have been applied. For each association the main synonyms as well as information about structure, ecology, and general and regional distributions are provided. Some features of classification of aquatic vegetation are discussed.

scholarly journals Multiple-Facet Diversity Patterns of Aquatic Vegetation in Lakes along a Trophic Gradient

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2281
Author(s):  
Dimitrios Zervas ◽  
Vasiliki Tsiaoussi ◽  
Athanasios S. Kallimanis ◽  
Panayotis Dimopoulos ◽  
Erwin Bergmeier ◽  
...  
Keyword(s):  
Aquatic Plant ◽  
Aquatic Vegetation ◽  
Nutrient Loading ◽  
Alpha Diversity ◽  
Diversity Indices ◽  
Trophic Levels ◽  
Trophic Gradient ◽  
Lake Ecosystems ◽  
Functional Richness ◽  
Richness Pattern

The EU Water Framework Directive foresees the ecological assessment of surface waters against identified pressures. Nutrient loading is the main pressure impairing the ecological quality of lake ecosystems, and aquatic macrophytes are considered good indicators of ecological response. In this study, we statistically assessed different aspects of aquatic plant (macrophyte) diversity in response to different trophic levels in Mediterranean lakes. We used 5690 relevés of aquatic vegetation, distributed over 305 transects, sampled in 18 freshwater lake ecosystems during 2013–2016. Our results show a significant decrease in taxonomic alpha diversity in lakes with a total phosphorus content above 100 μg/L. Syntaxonomic diversity followed the species richness pattern as well. Functional richness decreased along the trophic gradient, while functional dispersion was higher in lakes with high trophic levels. Taxonomic and functional beta partitioning presented changes in assembly processes leading to greater community homogeneity in lakes with higher trophic levels. In summary, we found no redundancy between taxonomic and functional diversity indices. These results provide novel insights into aquatic plant assembly processes of impacted freshwater lakes needed to forward conservation and restoration practices.

Vegetation of Salavat town (Bashkortostan Republic). I. The higher aquatic vegetation (classes Lemnetea and Potametea)

2011 ◽  
pp. 55-70 ◽  
Author(s):  
Ya. M. Golovanov ◽  
S. S. Petrov ◽  
L. M. Abramova
Keyword(s):  
Plant Communities ◽  
Aquatic Plant ◽  
Aquatic Vegetation ◽  
Sewage Disposal ◽  
The Third ◽  
Higher Aquatic Vegetation ◽  
The Republic

The results of a syntaxonomical study (by Braun-Blanquet method) of higher aquatic plant communities of Salavat town (Bashkortostan Republic), the third city in the republic with population approximately of 150 000 people, are presented. The diversity of communities of aquatic vegetation has been classified. They belong to 2 classes (Lemnetea, Potametea), 3 orders (Lemnetalia, Hydrocharitetalia and Potametalia), 4 alliances (Lemnion minoris, Hydrocharition morsus-ranae, Potamion pectinati and Nymphaeion albae), 14 associations and 10 variants. An expansion of the communities belong to associations Elodeetum canadensis, Najadetum marinae in the Belaya river was noticed. It indicates the intensification of sewage disposal to the river.

scholarly journals Алелопатичні зв’язки спірохет Leptospira Interrogans у фітоценозах болотистих лук

2013 ◽  
pp. 43-44
Author(s):  
В. В. Гулай
Keyword(s):  
Plant Communities ◽  
Higher Plants ◽  
Steppe Zone ◽  
Water Soluble ◽  
Forest Steppe ◽  
Leptospira Interrogans ◽  
Vegetation Types ◽  
Negative Effect ◽  
Relationship Of ◽  
The Relationship

Наводяться відомості щодо особливостей екологічних взаємозв’язків вищих рослин та патогенних лептоспір в умовах фітоценозів болотистих лукЛісосотепу України. Основою екологічного впливу представників рослинності зазначених біотопів на спірохет є топічний тип біотичних зв’язків, щопроявляється у виділенні водорозчинних алелопатичноактивних речовин, як живими рослинами, так і з їх залишків. У цілому фонові види рослинності проявляють негативну дію на збудника лептоспірозу, що зменшує час перебування цих спірохет у фітоценозах болотистих лук. There is information on the environmental characteristics of the relationship of higher plants and pathogenic leptospirs in plant communities marshy meadows Forest-Steppe zone of Ukraine. The basis of the environmental impact of these representatives vegetation habitats for spirochetes are topical type of biotic linkages, resulting in the allocation of water-soluble substances allelopathy activity as living plants and their residues. In general, background vegetation types show a negative effect on the pathogen leptospirosis, which reduces the time spent in these spirochetes phytocenoses marshy meadows.

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

Geobotanical studies at the Caucasus: a review of materials of the International Conference “Flora and conservation in the Caucasus: history and current state of knowledge” (Pyatigorsk, May 22–25, 2019)

2019 ◽  
pp. 91-94
Author(s):  
T. M. Lysenko ◽  
V. Yu. Neshatayeva ◽  
Z. V. Dutova
Keyword(s):  
Plant Communities ◽  
Aquatic Vegetation ◽  
Plant Cover ◽  
Floristic Composition ◽  
Current Status ◽  
Wide Field ◽  
The Caucasus ◽  
International Conference ◽  
Rare And Endangered Species ◽  
Current State

The International conference “Flora and conservation in the Caucasus: history and current state of knowledge” dedicated to the 130-year anniversary of the Perkalsky Arboretum took place at 22–25 of May 2019 in Pyatigorsk (Stavropol Territory) on the base of the Pyatigorsk Museum of local lore and natural history. The participants were from 11 cities of Russia and 7 Republics of the Caucasus and represented 14 institutions. Proceedings of the conference were published by the beginning of the meeting the book of abstracts includes 49 papers on the study of vascular plants, bryophytes, lichens and fungi, plant communities, as well as the protection of rare and endangered species, unique plant communities, and ecological problems in the Caucasus. The following geobotanical topics were highlighted in 13 papers: forest communities (3 reports), meadow and steppe vegetation (2), xeric open forests (2), communities of ecotone areas (1), structure of populations of rare plant species (3), as well as the history and current status of nature protected areas (2). The great emphasis has been focused on the study of floristic composition and plant populations. Thus, the conference showed that very few studies от vegetation are currently carried out in the Caucasus, and a lot of districts are not affected by the research. The greatest attention is paid to forest vegetation while meadow, steppe, alpine heath and xerophytic communities are studied rather poorly. Besides, there are “white spots” — mire, floodplain and aquatic vegetation. In nowadays, when the anthropogenic impact on the plant cover of the Caucasus is intensively increasing, it is especially important to study natural undisturbed communities preserved in protected natural areas. Another important issue is the conservation of the unique vegetation cover of the whole Caucasus. Thus, the study of vegetation of this region opens a wide field for researchers using various methods of modern plant science.

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