Study of algal flora in autumn and winter in Yueya Lake in Nanjing City
0
Citation
0
Reference
20
Related Paper
Abstract:
Algal communities in Yueya Lake in Nanjing City were investigated during the period from October 2012 to January 2013.More than 160 samples of aquatic algae were collected from six typical sampling sites,and these samples were observed,identified,and statistically analyzed,in order to study the floral compositions and temporal and spatial distributions of algae in the lake.The results show that there are 57 taxa of algae belonging to eight divisions,29 families,and 57 genera,and they are mostly composed of Cyanophyta,Bacillariophyta,and Chlorophyta( accounting for 47.37% of the total).There are twelve dominant taxa of algae in the lake and six of them are bloom species.The algae have the highest species abundance and the highest density in October.As the temperature declines,the species abundance and density begin to decrease.Analysis of the distribution patterns of the algae and pollution-indicating algae in the lake shows that the waters of the Yueya Lake have been polluted to a certain extent.Keywords:
Flora
Green algae
Cite
Communities structure, standing crops of benthic algae were investigated in the littoral zone of 6 Yunnan plateau lakes,and benthic algae communities were composed of Cladophora spp. of green algae and some epilithic species of diatom during the studying period,the diatom communities was dominated in the Lake Lughu, the percent of green algae communities was higher than diatom communities in the other lakes. The standing crops (chl a) of benthic algae and the density of benthic diatom was highest in the Lake Xingyunhu (24 mu g.cm(-2)) and in the Lake Luguhu-Niaodao respectively, reached maximum devlopment in numbers of 9.3 x 10(6) cells.cm(-2). The study found the benthic diatom Epithemia sorex and Cocconeis klamathensis were the dominant indicator taxa separately in the Lake Luguhu and Fuxianhu, Amphora pediculus was die most abundant species in the Lake Yangzonghai and Dianchi-gingbao, There were a lot of the dominant taxon In the Lakes Erhai, Xingyunhu, Dianchi-youyicun, whereas the higher relative abundance taxon in these lakes were epilithic. The results pointed out that the environmental factors, such as nutrient enrichment, littoral zone sunlight and substrate types were very important in controlling community distribution.
Cladophora
Periphyton
Cite
Citations (3)
The phytoplankton of the Hirfanli dam lake was investigated monthly between August 2008 and July 2009. The samples were taken using plankton net with a pore diameter of 55 μm. A total of 69 taxa belonging to 6 divisions have been identified, including Bacillariophyta (32 taxa), Chlorophyta (18 taxa), Cyanobacteria (11 taxa), Euglenophyta (2 taxa), Charophyta (4 taxa), Miozoa (2 taxa). Seasonal distribution of phytoplankton was also investigated. Seasonal increase rate was determined higher in spring, summer, and autumn. Even though seasonal distribution of phytoplankton species varied, Navicula sp., Cyclotella sp., Nitzschia sp., Gomphonema sp., and Lyngbya sp. were found as dominant.
Navicula
Lyngbya
Seasonality
Cite
Citations (0)
This study was performed from March 2004 to February 2005 in 4 stations in Gala Lake, a shallow lake located inside Gala Lake National Park in Meric Delta. Water samples were taken from the lake in order to determine the phytoplankton present in the lake and to perform physicochemical analysis. A total of 112 taxa from 5 divisio were identified during the study period. Chlorophyta was the most diversed group in the lake with 47 taxa and diatoms were found to have the highest cell counts with a mean value of 670011 cell L -1 . The general pattern of seasonal succession in phytoplankton of the lake was represented with Chlorophyta in June and with Cyanophyta in September and Diatoms were the dominant group of the lake in all other months. A spatial heterogeneity was observed in the lake where a slight Microsystis spp. increase occurred in early autumn months. Comparison with former phytoplankton data showed distinct differences in terms of the qualitative and quantitative composition of the phytoplankton community of Lake Gala, which indicates lake deterioration.
Cite
Citations (7)
Periphyton
Cite
Citations (6)
In this study, the composition and density of the benthic algae and seasonal variations of the benthic algae of Palandoken Pond were determined between September 1990 and September 1992. Samples were collected from two previously selected sampling sites. It was found that Bacillariophyta was the dominant benthic algal group in this pond. During our investigation a total of 160 taxa were identified and 135 them were composed of epipelic algae. The percentages of algal groups were as follows: Bacillariophyta 57%, Cholorphyta 11% and Euglenophyta5%. It was found that there were plenty of epipelic algal species living together with epiphytic and epilitic algal communities. Chlorophytaand Cyonophytawere found more commonly in these communities. It was seen that in our research area there was a dominancy of the diatom population which prefers slightly alkaline water and calcareous sediments.
Epiphyte
Flora
Cite
Citations (2)
Species composition and standing crops of phytoplankton at five stations in Lake Chungju were investigated monthly from January 1993 to December 1994. A total of 175 taxa (38 Cyanophyta, 79 Chlorophyta, 49 Chrysophyta, 3 Pyrrhophyta and 6 Euglenophyta) was identified. Among them, 59 species were found at all the stations, while 45 species were only at a single station. The number of species was most abundant at station 1 in down-stream (127 spp.), and the poorest at station 4 in up-stream station (75 spp.). Number of species, as a whole, showed the highest during summer to mid-autumn and decreased gradually since late autumn until early spring. The standing crops of phytoplankton ranged , and averaged in 1993 and in 1994. The minimum value was recorded in March 1993 (), and the maximum in September 1994 () due to the blue-green algal blooming. Dominant species determined by standing crops were 29 species. They showed a clear seasonal succession in this lake. Diatoms contributed the proportion of standing crops significantly during winter and spring, while blue-green algae and green algae were during summer and autumn. Species diversity index (H') of phytoplankton community on an annual average was 1.52 in 1993 and 1.65 in 1994. The highest value was recorded in June, while the lowest from April to May due to the diatom blooming and during July to September due to the blue-green algal blooming. The species diversity was generally higher at a downstream station than at up- to middle-stream stations.
Standing crop
Diversity index
Cite
Citations (3)
Studies on phytoplankton species diversity and abundance were carried out in 8 selected satellite lakes within the Lake Victoria basin during two wet seasons (March-April 2002 and January-February 2003) and one dry season (August-September 2002). Higher species richness (76 species) of phytoplankton species was recorded in rain season than in dry season (47 species). The observed species represents six classes, cyanophytes, chlorophytes, cryptophytes, basillariophytes, euglenophytes and dinophytes, of fresh water algal flora. Species diversity was generally low, with diversity indices (H\') ranging from 0.21 for Lake Kyarano to 0.09 for Lake Ikimba. On the contrary, Lake Katwe was richer in terms of species (66) followed by Burigi (49) and Ikimba (47). Lake Kubigena represented a lowest number (17) of species. Lake Burigi showed the highest abundance (611624 cell/ml) in rain season, while Lake Kyarano showed the lowest abundance (1336 cells/ml) recorded in dry season. Cyanophytes dominated (75-98% of counted cells) the phytoplankton community throughout the study period followed by bacillariophytes (0.2 -14% of counted cells) in all lakes except Lake Kyarano, which was dominated by Dinophytes (71%), whereas euglenophyta and chrysophyta were rarely encountered. The results clearly show that the phytoplankton community of satellite lakes were largely dominated by cyanophytes. This may indicate high nutrient loading (pollution) in these lakes that are certainly resulting from the surroundings. These findings call for a special attention on cyanobacteria occurrence and their unforeseen effects such as toxin production and oxygen depletion during nights that may results into fish killings. Tanzania Journal of Science Vol.30(1) 2004: 83-91
Dry season
Wet season
Cite
Citations (16)
The water quality and algae community of Nanyuan Water System in the old city area of Suzhou were monitored for a year. Results showed that the water pollution in the studied area was mainly related to nitrogen (NH4+ -N and TN). Sometimes, they even exceeded the Environmental Quality Standards for Surface Water (GB 3838-2002, PRC) more than 5 times. 34 species of benthic epipelic algae were observed by microscope, and the species amount of diatom algae, green algae and blue algae are more than others. Their abundance and biomass are far higher than that of the pelagic algae in the same sites,and reach 2 145.5 x 10(4) cells/mL and 3.524 mg/mL,respectively. The dominant species of benthic epipelic algae in Nanyuan's water system are diatom algae and blue algae, most of which belong to the heterotrophic type or bi-trophic type algae, the typical genera include: Oscillaria amphibian (affiliated to Cyanophyta), Cyclotella sp., Melosira sp., Stephanodiscus hantzschii, Navicula sp., Nitzschia sp., Gomphonema (affiliated to Bacillariophyta) and so on. And their distribution of species and abundance are very nonuniform in different reach of heavily polluted city river, which relates to the pollutant characteristics of the river. The seasonal variety trend of the abundance for benthic algae showed that:summer > autumn > spring > winter, and that of biomass for benthic algae showed that: the biomass in winter is the most of four seasons and change extent of the biomass is not obvious in spring, summer and autumn. The research results can provide reference for the ecology restoration of city heavily polluted river.
Navicula
Nitzschia
Green algae
Cite
Citations (0)
Cite
Citations (1)
Seasonal variation in the species composition of the benthic algae of Karagöl Lake was investigated from April to October in 2001 and 2002. The benthic algal flora consisted of 38 taxa belonging to the divisions Chlorophyta, Cyanophyta, Euglenophyta, and Chrysophyta. In general, Chlorophyta were dominant in terms of species number and abundance during the study period. The distribution range of the benthic algae composition and dominant species differed from each other at all stations. Benthic algal growth was mostly influenced by water temperature and light.
Cite
Citations (9)