Publication Date:
2020
Description:
〈p〉Publication date: Available online 17 January 2020〈/p〉
〈p〉〈b〉Source:〈/b〉 Ecohydrology & Hydrobiology〈/p〉
〈p〉Author(s): Rong Xiao, Qian Wang, Mingxiang Zhang, Wenbin Pan, Jian Jim Wang〈/p〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉In order to discover the plankton distribution patterns and its relationship with environment gradients and hydrological connectivity in wetlands, samples from Yellow River Delta that span gradients in salinity and hydrological connectivity were analyzed in this study. Plankton community composition, abundance and biomass were determined and correlated with water variables and hydrological connectivity indexes to gain information about the forces that structure the plankton community in this dynamic environment. Phytoplankton with a total of 88 species and zooplankton with a total of 49 species were observed at an average abundance of 4.11 × 10〈sup〉7〈/sup〉 cells/L and 951.27 ind./L, respectively. Predominant species were 〈em〉Merismopedia minima〈/em〉 G.Beck/〈em〉Merismopedia elegans〈/em〉 A. Braun ex Kützing (Cyanobacteria) and 〈em〉Trichocerca pusilla〈/em〉 (Jennings) (Rotifera), accounting for over 10% of the total abundance of phytoplankton and zooplankton, respectively. The dominant species of phytoplankton communities were shifted from freshwater Chlorophyta (e.g., 〈em〉Oocystis〈/em〉 sp.) to brackish Cyanobacteria (e.g., 〈em〉Merismopedia minima〈/em〉 and 〈em〉Merismopedia elegans〈/em〉) and then to marine cyanobacterium (e.g., 〈em〉Oscillatoria〈/em〉 sp. and 〈em〉Pseudoanabaena〈/em〉 sp.); That shift in zooplankton community was from freshwater rotifers 〈em〉Trichocerca pusilla〈/em〉 and 〈em〉Polyarthra trigla〈/em〉 (Ehrenberg) to brackish rotifer 〈em〉Brachionus urceus〈/em〉 (Linnaeus) and copepod 〈em〉Thermocyclops〈/em〉 spp. and then to marine copepods 〈em〉Sinocalanus〈/em〉 spp. and 〈em〉Microsetella〈/em〉 spp. toward the river mouth. However, abundance, biomass and community similarity of plankton decreased with increasing water salinity and decreasing hydrological connectivity from upper reaches to river mouth. Salinity gradient could be major force for the shift of plankton community while the increasing hydrological connectivity between freshwater and saline habitats promoted the similarity of plankton distribution patterns within the wetland network.〈/p〉〈/div〉
Print ISSN:
1642-3593
Electronic ISSN:
2080-3397
Topics:
Architecture, Civil Engineering, Surveying
,
Biology
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