ORCID Profile
0000-0001-7835-9804
Current Organisation
Vavuniya Campus of the University of Jaffna
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Springer Science and Business Media LLC
Date: 26-02-2023
DOI: 10.1186/S41936-023-00328-8
Abstract: Zooplankton exhibit strong responses for minute changes in their habitat. Therefore, this study intended to investigate the impacts of hydro-climatic factors and related water quality variables on zooplankton abundance and ersity in the perennial Vavuniya reservoir (VR) and seasonal Thandikulam reservoir (TR), Vavuniya, Sri Lanka. Zooplankton ersity and abundance showed some peculiarities between seasonal and perennial reservoirs under varying hydro-climatic factors and water quality parameters during wet and dry seasons (July 2018–February 2019). There were 14 Rotifera, 4 Cladocera and 5 Copepod species in VR, and in TR, 12 Rotifera, 2 Cladocera and 5 Copepod species were identified. Although these reservoirs are located at proximity (2.48 km), the responses via zooplankton community structure toward environmental factors have been shown uniqueness to some extent. Significant negative correlation was observed for increasing $${\\text{NO}}_{{3}}^{ - }$$ NO 3 - ( p = 0.044) and $${\\text{PO}}_{{4}}^{{{3} - }}$$ PO 4 3 - ( p = 0.010) concentrations with zooplankton ersity in perennial VR however, only $${\\text{PO}}_{{4}}^{{{3} - }}$$ PO 4 3 - concentration showed a significantly ( p = 0.042) negative correlation in seasonal TR. Interestingly, total zooplankton abundance showed significant negative correlations with $${\\text{NO}}_{{3}}^{ - }$$ NO 3 - ( p = 0.013) and $${\\text{PO}}_{{4}}^{3 - }$$ PO 4 3 - ( p = 0.038) in perennial VR however, insignificant negative correlation was observed in seasonal TR. Copepods make up the majority of total zooplankton abundance in both reservoirs and were significantly affected by increased atmospheric temperature. Cladocera abundance in VR was highly sensitive ( p = 0.032 r = − 0.856) to changes in water level. Increasing water level significantly favors the total zooplankton abundance in the seasonal reservoir but not in perennial. Sensitivity of zooplankton community structure varies between seasonal and perennial reservoirs in different magnitudes. This is due to the increasing temperatures, increasing phosphate levels and decreasing water levels with the combination of other factors resulting in specific responses of zooplankton ersity and abundance. Therefore, it would not be surprised to use zooplankton community structure to sense the vibrant responses of different freshwater habitats.
Publisher: Wiley
Date: 08-05-2021
DOI: 10.1111/WRE.12478
Abstract: Hydrilla verticillata (Hydrocharitaceae) is a submerged freshwater flowering plant within the monotypic genus. Over the geological periods, fossils of this family and genus have shown distinct ersifications between warm and cool fluctuations with more adaptations occurring in warmer periods and suppressions during severely cold paleoclimate changes. Recently, H. verticillata has shown a wide range of adaptive plasticity, allowing successful proliferation into non‐native regions, whilst also undergoing unexplained disappearance from its native localities, and this phenomenon has stimulated this inquiry. Against this somewhat complex background, particular interest for this investigation has been focussed on an understanding of which aspects of climate change have contributed towards global adaptations and distribution patterns of H . verticillata . Whilst it is recognised that some of these changes are natural, other aggravating impacts are due to anthropogenic influences. Identifying the appropriate combinations of these climatic factors (temperature, rainfall, photoperiod), in concert with environmental (water level, CO 2 , salinity, eutrophication), geographical (altitude, latitude) and other factors (UV‐B) are necessary precursors for instituting appropriate management strategies. In this respect, control measures are needed in non‐native regions and restoration of this plant in native habitats are essential for its ecologically balanced global distribution.
Location: Sri Lanka
No related grants have been discovered for Anton Emmanuel Selvakumar Patrick.