Some remarks on long-term and seasonal changes in the zooplankton of Parakrama Samudra

Fernando, C. H.; Rajapaksa, R.

doi:10.1007/978-94-009-7281-0_6

Cited by 16 publications

(10 citation statements)

References 12 publications

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“…Similar trend has been recorded in several other water bodies in Sri Lanka including Randenigala (Pathmalal and Piyasiri 1999) and Kotmale (Piyasiri and Chandrananda 1998) reservoirs in the central highlands, Bolgoda (Wignarajah and Amarasiriwardene 1983) and Beira (Kamaladasa and Jayatunga 2007) lakes in the western coastal region of the wet zone and Parakrama Samudra in the low country dry zone (Fernando and Rajapakse 1983). However, Wickramasinghe et al (2012) recorded lesser number of species of cladocerans than that of copepods in an urban wetland in the wet zone of Sri Lanka.…”

Section: Discussionsupporting

confidence: 48%

“…The number of species of zooplankton recorded in a single reservoir during the present study was less than those recorded for many other reservoirs in Sri Lanka including Parakrama Samudra (Fernando and Rajapakse 1983), Kalawewa (Jayatunga 1986), Giritale (Cooray and Jayatunga 2000), Randenigala (Pathmalal and Piyasiri 1999), Kotmale (Piyasiri and Chandrananda), and Victoria (Piyasiri and Jayakody 1991) reservoirs. Of these, the latter three reservoirs are highland reservoirs which are classified as oligo-mesotrophic (Rott et al 2008).…”

Section: Discussionmentioning

confidence: 56%

“…Further, these two species have been recorded in Kotmale reservoir too (Piyasiri and Chandrananda 1998), which is classified as oligo-mesotrophic (Rott et al 2008). In addition, B. falcatus has been recorded in Randenigala reservoir, (Pathmalal and Piyasiri 1999), which is another upland reservoir classified as oligo-mesotrophic (Rott et al 2008) and in Parakrama Samudra (Fernando and Rajapakse 1983), which is considered as meso-eutrophic (Rott et al 2008). Hence these two species are not confined to eutrophic water bodies they cannot be considered as bio-indicators of eutrophication in Sri Lankan waters.…”

Section: Discussionmentioning

confidence: 99%

“…Taxonomy of Sri Lankan zooplankton has been studied by Changalath et al (1974), Fernando (1980aFernando ( , 1980b, Rajapakse and Fernando (1982) and Fernando and Weerawardhena (2002). Several studies on the zooplankton of Parakrama Samudra, an ancient major irrigation reservoir in the dry zone of Sri Lanka have received the attention of many researchers (Duncan 1983(Duncan , 1984Gulati 1983, Fernando andRajapakse 1983). The effects of food and temperature on the life cycle of some zooplankton in Kalawewa, another ancient major irrigation reservoir in the dry zone of Sri Lanka have been studied by Jayatunga (1986).…”

Section: Introductionmentioning

confidence: 99%

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Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Sangakkara¹,

Wijeyaratne

2015

Sri Lanka J. Aquat.

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Diversity and abundance of zooplankton in relation to nitrate-N and total phosphorus levels of 20 minor and medium scale reservoirs in the low country intermediate zone of Sri Lanka were studied in June-October 2013. Total phosphorus content ranged from 0.029 mg L -1 recorded in Wendaruwewa reservoir to 0.529 mg L -1 recorded in Karangamuwa reservoir and Nitrate-N content varied from 1.186 mg L -1 recorded in Adukkane reservoir to 5.625 mg L -1 recorded in Anukkane reservoir indicating that all reservoirs studied are eutrophic. During the present study, a total of 43 species of zooplankton, comprising 31 species of rotifers, 9 species of cladocerans and 3 species of copepods were recorded. Number of zooplankton species in any one reservoir, which ranged from 4 to 13, was significantly correlated with the nitrate-N content (p<0.05). The most widely distributed zooplankton species was Diacyclops nanus, which was present in 15 reservoirs. Abundance of zooplankton ranged from 4 individuals L -1 recorded for Alona monocantha and Chydorus parvus in Wendaruwewa and Metiyagane reservoirs respectively to 1017 individuals L -1 recorded for Filinia terminalis in Galewela reservoir. Margalef index which ranged from 0.532 in Adukkane reservoir to 2.096 in Dewahuwa reservoir, was significantly correlated with nitrate-N content of water (p<0.05). Pielou index ranging from 0.65 in Galewela reservoir to 0.92 in Polpitiya reservoir and Shannon-Weiner index ranging from 0.91 in Munamaldeniya reservoir to 2.13 in Dewahuwa reservoir were not significantly correlated with nitrate-N and total phosphorus levels of water (p>0.05). Keratella quadrata was present only in Anukkane reservoir where the nitrate-N content was the highest and therefore it may be considered as a bio-indicator of high levels of nitrate-N. Eutrophic conditions of theses reservoirs may possibly be due to runoff of nutrients from agricultural fields as these are located in an intense agricultural area. Therefore, it is necessary to take immediate action to control the overuse of inorganic fertilizer in this area so that contamination of water bodies with nutrients can be minimized.

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Section: Discussionsupporting

confidence: 48%

Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Sangakkara¹,

Wijeyaratne

2015

Sri Lanka J. Aquat.

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“…Similar results were obtained in Prakrama Samudra by Fernando & Rajapaksa in 1983. They have recorded 32 species of Rotifers, 7 species of Cladocerans, 6 species of Copepods and 4 species of Protozoans etc.…”

Section: Discussionsupporting

confidence: 84%

A Preliminary Study on the Variation of Zooplankton Diversity, Abundance and Density in a Selected Branch of Diyawanna Oya Canal System

Perera

2015

OUSL Jnl

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Zooplankton make the secondary level in aquatic ecosystems and provide a ready source of food for secondary consumers. Hence any fluctuation in their population will directly affect the food webs, and eventually the whole ecological system. This study was carried out along a main branch of Diyawanna Oya, during the period of February to July, 2003. The objectives of the study were to find out the variation in diversity, abundance and density of zooplankton present in a selected branch of Diyawanna Oya and their correlation with some environmental parameters. Zooplankton & water samples were collected monthly from six stations representing both edges and the middle of the canal. During the study, 39 species of rotifers, 9 species of cladocerans, 6 species of copepods, 5 species of ostracods, some larval stages of malacostracans, 2 species of large protozoans and one Tardigrade species were recorded. There was a significant monthly variation in the average density of zooplankton. It was positively correlated with the flow rate (r = 0.81), depth (r = 0.47) and temperature (r = 0.58) of water. And there was a significant variation in density and abundance among six sampling stations. Density values of stations were positively correlated with DO level (r = 0.72) while it was negatively correlated with total alkalinity (r = -0.78), total hardness (r = -0.67) and conductivity (r = -0.6). The highest average density of zooplankton was recorded from Kotte whereas the least was from Torrington. Additionally, the possibility of ousing Lacane sp., Philodina sp. and Moina micrura taxa as indicators was also noted.

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Invertebrate zooplankton predator composition and diversity in tropical lentic waters

Fernando

Tudorancea

Mengestou

1990

Intrazooplankton Predation

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Some remarks on long-term and seasonal changes in the zooplankton of Parakrama Samudra

Cited by 16 publications

References 12 publications

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka

A Preliminary Study on the Variation of Zooplankton Diversity, Abundance and Density in a Selected Branch of Diyawanna Oya Canal System

Invertebrate zooplankton predator composition and diversity in tropical lentic waters

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