scholarly journals How suitable are man-made water bodies as habitats for Odonata?

2020 ◽  
pp. 13 ◽  
Author(s):  
Marina Vilenica ◽  
Ivana Pozojević ◽  
Natalija Vučković ◽  
Zlatko Mihaljević
Keyword(s):  
Water Level ◽  
Aquatic Vegetation ◽  
Negative Impact ◽  
Sampling Site ◽  
Water Bodies ◽  
Habitat Modification ◽  
Water Level Fluctuations ◽  
Widespread Species ◽  
Rare And Endangered ◽  
Vegetation Water

Many studies have reported a negative impact of freshwater habitat modification on biota. Nevertheless, some man-made water bodies have proven to be valuable for biodiversity conservation as they can harbour many species. We investigated 36 man-made water bodies to determine their suitability as habitats for Odonata. Larvae were sampled in littoral, during the summer months of 2016 and 2017. At each sampling site, ten samples were collected using a benthos hand net. A total of 21 Odonata species was recorded. Odonata assemblages mainly consisted of common widespread species. Yet, at Vlačine Reservoir, located in the Dinaric Western Balkan ecoregion, we also recorded a rare and endangered Mediterranean species, Lindenia tetraphylla (Vander Linden, 1825). Aquatic and riparian vegetation, water level fluctuations and dissolved oxygen concentration had the highest influence on Odonata, showing that man-made water bodies with a well-developed riparian zone and aquatic vegetation, and with low daily and seasonal water level fluctuations, can provide suitable habitats for diverse Odonata species. Odonata are among the sensitive freshwater insects widely used as ecological indicators and umbrella species, therefore these results about their assemblages in heavily modified and man-made habitats could contribute to future conservation activities of freshwater biota and habitats.

Chara braunii (Charales, Charophyta) in an Arid Rainfed Waterbody, Saudi Arabia

1999 ◽  
Vol 47 (3) ◽  
pp. 427 ◽  
Author(s):  
M. I. Hussain ◽  
T. M. Khoja
Keyword(s):  
Saudi Arabia ◽  
Aquatic Vegetation ◽  
Gradual Increase ◽  
Water Level Fluctuations ◽  
Salinity Range ◽  
Concentration Of Ions ◽  
Temporal Succession ◽  
Vegetation Water

An account is given of a typical rainfed waterbody in the Al-Ammariyah Wadi (Saudi Arabia), with special reference to charophyte vegetation, water chemistry and topography of the area, which was studied from April 1996 to July 1997. Recurring patterns following rainfall and inundation of the waterbody are described as a model of temporal succession of biotic communities. Unispecific Chara braunii Gm. meadows were the first aquatic vegetation to emerge and overwhelmingly dominated the freshwater lentic ecosystem. This was followed by plankton and desert plants as the waterbody dried out. Chara braunii is reported as a new record for the Saudi Arabian charoflora. The species is characterised as stenohaline and tends to grow in vivo and in vitro in the salinity range of 0.2–0.8‰. A gradual increase in elements and ions (Si 20–31 mg L–1 and pH 6.8–7.6) in the water was demonstrated as the waterbody desiccated. As a result of the increasing concentration of ions and pH, C. braunii developed heavy encrustation, and hastened fructification prior to desiccation of the waterbody between June and July 1997. Survival and emergence of C. braunii is positively correlated with drought resistant-oospores, specificity to hyposalinity, water-level fluctuations, and absence of herbivores.

Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota

1991 ◽  
Vol 69 (7) ◽  
pp. 1542-1551 ◽  
Author(s):  
Douglas A. Wilcox ◽  
James E. Meeker
Keyword(s):  
Water Level ◽  
Growth Form ◽  
Aquatic Vegetation ◽  
Aquatic Macrophyte ◽  
Structural Diversity ◽  
Water Level Fluctuations ◽  
Vegetation Growth ◽  
Macrophyte Communities ◽  
Regulated Lakes ◽  
Diverse Plant

The effects of water-level regulation on aquatic macrophyte communities were investigated by comparing two regulated lakes in northern Minnesota with a nearby unregulated lake. Natural annual fluctuations of about 1.8 m were replaced with fluctuations of 1.1 m and 2.7 m in the regulated lakes, and the timing of water-level changes was also altered. Quadrats were sampled along transects that followed depth contours representing different plant habitats in the unregulated lake. Ordinations showed that the macrophyte communities at all sampled depths of the regulated lakes differed from those in the unregulated lake. The unregulated lake supported structurally diverse plant communities at all depths. In the lake with reduced fluctuations, only four taxa were present along transects that were never dewatered; all were erect aquatics that extended through the entire water column. In the lake with increased fluctuations, rosette and mat-forming species dominated transects where drawdown occurred in early winter and disturbance resulted from ice formation in the sediments. The natural hydrologic regime at the unregulated lake resulted in intermediate disturbance and high diversity. There was either too little or too much disturbance from water-level fluctuations in the regulated lakes, both resulting in reduced structural diversity. Key words: reservoirs, lake-level regulation, winter drawdown, aquatic vegetation, growth form, disturbance.

scholarly journals Long Term Aquatic Vegetation Dynamics in Longgan Lake Using Landsat Time Series and Their Responses to Water Level Fluctuation

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2178
Author(s):  
Wenxia Tan ◽  
Jindi Xing ◽  
Shao Yang ◽  
Gongliang Yu ◽  
Panpan Sun ◽  
...  
Keyword(s):  
Water Level ◽  
Water Depth ◽  
Vegetation Index ◽  
Aquatic Vegetation ◽  
Yangtze River Basin ◽  
Google Earth ◽  
Water Level Fluctuations ◽  
Quantitative Evidence ◽  
Longgan Lake

Aquatic vegetation in shallow freshwater lakes are severely degraded worldwide, even though they are essential for inland ecosystem services. Detailed information about the long term variability of aquatic plants can help investigate the potential driving mechanisms and help mitigate the degradation. In this paper, based on Google Earth Engine cloud-computing platform, we made use of a 33-year (1987–2019) retrospective archive of moderate resolution Landsat TM, ETM + and OLI satellite images to estimate the extent changes in aquatic vegetation in Longgan Lake from Middle Yangtze River Basin in China using the modified enhanced vegetation index, including emerged, floating-leaved and floating macrophytes. The analysis of the long term dynamics of aquatic vegetation showed that aquatic vegetation were mainly distributed in the western part of the lake, where lake bottom elevation ranged from 11 to 12 m, with average water depth of less than 1 m in spring. The vegetation area variation for the 33-year period were divided into six stages. In years with heavy precipitation, the vegetation area decreased sharply. In the following years, the area normally restored. Aquatic vegetation area had a significant negative correlation with the spring water level and summer water level. The results showed that aquatic vegetation was negatively affected when water depth exceeded 2.5 m in May and 5 m in summer. It is recommended that water depth remain close to 1 m in spring and close to 3 m in summer for aquatic vegetation growth. Our study provide quantitative evidence that water-level fluctuations drive vegetation changes in Longgan Lake, and present a basis for sustainable lake restoration and management.

scholarly journals Effects of Water Level Fluctuation on Waterbirds Distribution and Aquatic Vegetation Composition at Natural Wetland Reserve, Peninsular Malaysia

ISRN Ecology ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
Muhammad Nawaz Rajpar ◽  
Mohamed Zakaria
Keyword(s):  
Water Level ◽  
Water Body ◽  
Aquatic Vegetation ◽  
Open Water ◽  
Peninsular Malaysia ◽  
Water Level Fluctuations ◽  
Sampling Point ◽  
Vegetation Composition ◽  
Natural Wetland ◽  
Open Water Body

The effects of water level fluctuations on waterbirds distribution and aquatic vegetation composition was determined using distance sampling point count method and direct visual observation at Paya Indah Natural Wetland Reserve, Peninsular Malaysia. A total of 2563 waterbird individual of 28 species and 8 families were detected in three habitats, that is, marsh swamp (68.59%), open water body (18.42%), and lotus swamp (12.99%). Porphyrio porphyrio was the most dominant species in marsh swamp (45.39%), and lotus swamp (23.42%), whereas Dendrocygna javanica (42.16%) was the most abundant in open water body. The highest water level for marsh swamp (2.313 m) and lotus swamp (2.249 m) was recorded in January, 2008 and for open water body (2.572 m) in January and April, 2008. In contrast, the lowest water level for marsh swamp (2.048 m) and lotus swamp (1.834 m) was determined in October, 2008 and for open water body (2.398 m) in January, 2009. Pearson test indicates weak linear correlationship between water level and waterbird abundance in lotus swamp habitat (r2=0.120,P>0.05) and in marsh swamp (r2=0.100,P>0.05) and negative linear correlationship (r2=−0.710,P>0.05) in open water body habitat. Canonical correspondence analysis indicated strong correlationship between waterbird abundance and vegetation (73.0%) in open water body, and weaker association (29.8%) in lotus swamp. The results of this study indicate that water level is a major factor that influences the relative abundance and distribution of ducks, swamphen, crakes, herons, jacanas, and moorhens directly and indirectly. In addition, it also effects on the dynamics of aquatic vegetation composition such as, emergent, submerged, and grasses in this wetland reserve.

Succession of aquatic vegetation driven by reduced water-level fluctuations in floodplain lakes

2005 ◽  
Vol 42 (2) ◽  
pp. 251-260 ◽  
Author(s):  
G. J. VAN GEEST ◽  
H. COOPS ◽  
R. M. M. ROIJACKERS ◽  
A. D. BUIJSE ◽  
M. SCHEFFER
Keyword(s):  
Water Level ◽  
Aquatic Vegetation ◽  
Floodplain Lakes ◽  
Water Level Fluctuations ◽  
Reduced Water

scholarly journals Hydroecological features of water bodies within Zhukiv island in Kyiv

2020 ◽  
pp. 112-118
Author(s):  
V. I. Vyshnevskyi ◽  
S. A. Shevchuk ◽  
O. M. Kozytskyi
Keyword(s):  
Water Exchange ◽  
Aquatic Vegetation ◽  
Negative Impact ◽  
Ecological Status ◽  
Water Levels ◽  
Water Bodies ◽  
Water Runoff ◽  
Nature Protection ◽  
River Bank ◽  
The Impact

According to field research, cartographic works and satellite images, the main hydroecological features of water bodies on Zhukov Island in Kyiv have been studied. Information on the history of the impact of economic activity on this area is given. The first object affected the water bodies, located on the island, particularly for the Konyk river arm, was a railway tunnel, which was under construction in the late 1930s and early 1940s. Another factor was the construction of several roads. As the result of this construction the former Konyk river arm actually turned into the lake. Significant changes in this area were observed in the mid-1970s after the constriction of the Kanivske Reservoir. The increase in the water level in low water conditions by about 2.5 m caused an increase in the size of existing water bodies and the emergence of new ones. The description of the largest lakes in the studied area is given. For today they are a complex system of lakes in this area, hydraulically connected with the Dnipro River. At the same time, water exchange in the lakes and between the lakes and the river is insignificant. First of all, this is due to the low capacity of the existing hydraulic structures and clogging of ways to them. In fact, there is the only one hydraulic structure on the river bank through which water can reach the lakes. In addition, low water runoff of the Dnipro River in recent years also causes a negative impact on this ecosystem. Recently, intraday fluctuations of water discharges at the Kyiv HPP have decreased, and respectively the fluctuations of water levels in the Dnipro River near the studied area also decreased. This negatively affected the ecological condition of the lakes, which are intensively overgrown. In addition, wastewater inflow into one of the largest local lakes, namely Konyk, has a negative impact. The indicators of bottom sediments in this lake are given, which testify to its pollution by heavy metals. The typical species of aquatic and air-aquatic vegetation inherent to the lakes on Zhukov Island are characterized. The recommendation, which can improve water exchange in the lakes and their ecological status, are given. It was considered that the nature protection activity in this area can be improved in case of adding the created here landscape reserve to the National Nature Park “Holosiivskyi”.    

Impact of water level fluctuations on St. Lawrence River aquatic vegetation

1997 ◽  
Vol 54 (12) ◽  
pp. 2853-2865 ◽  
Author(s):  
Christiane Hudon
Keyword(s):  
Water Level ◽  
Aquatic Vegetation ◽  
Plant Biomass ◽  
Plant Cover ◽  
Negative Relationship ◽  
Climatic Conditions ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Vertical Range ◽  
St Lawrence River

Historical records of average seasonal water levels in the St. Lawrence River over the past 80 years reveal cyclic variations of up to 1 m above (1976) and 1 m below (1965) present levels. These variations are probably related to climatic conditions in the basin. Over the same period, the vertical range of seasonal water levels decreased from 2.2 to 1.5 m because of discharge regulation. Exposure of new substrate during periods of extreme low water levels may facilitate the invasion of aggressive and (or) exotic species. In Lake Saint-Pierre, a strong negative relationship was observed between seasonal water level and the percentage of emergent plant cover. Under low water levels, the lake becomes a large (387 km2) marshland that could support a high plant biomass (286 times 103 t) whereas under high water levels, the lake shifts to a vast (501 km2) open-water body with a lower predicted plant biomass (117 times 103 t). A model of the major anthropic and climatic forces acting on water levels is also presented; it describes aquatic plant biomass allocation and species diversity under different water level conditions.

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