Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams

• Published in: Hydrobiologia Vol. 703; no. 1; pp. 225 - 237
• Main Authors: Tang, Tao, Niu, Sophia Qian, Dudgeon, David
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2013; Springer; Springer Nature B.V
• Subjects: Achnanthes; Algae; Animal and plant ecology; Animal, plant and microbial ecology; Bacillariophyceae; Biological and medical sciences; Biomedical and Life Sciences; Calothrix; Chamaesiphon; Cocconeis; Creeks & streams; Downstream; Dry season; Ecology; Eunotia; Fresh water ecosystems; Freshwater; Freshwater & Marine Ecology; Fundamental and applied biological sciences. Psychology; General aspects; Life Sciences; Low flow; Phosphates; Plant cytology, morphology, systematics, chorology and evolution; Primary Research Paper; Rainy season; Seasons; Streams; Synecology; Thallophyta; Water treatment; Zoology; Hong Kong; Asia; China; Hong Kong China; China, People's Rep., Hong Kong; Diatoms; Environmental flow allocations; Morphological guilds; Flow reduction; Hydro–ecological relationship; Hierarchical partitioning; Algae; Tropical zone; Guild; Freshwater environment; Heterokontophyta; Aquatic environment; Bacillariophyta; Hydro-ecological relationship; Morphology; Stream; Alga; Epibenthos; Community
• DOI: 10.1007/s10750-012-1362-z
• ISSN: 0018-8158

We studied the effects of flow reduction on epibenthic algal assemblages by comparing up- and down-stream reaches of ten Hong Kong streams subject to different degrees of water abstraction during 2007–2008. Downstream discharge declined by 71 and 54% during the wet and dry seasons, respectively. Algal responses varied seasonally and according to morphological guild and reflecting reductions in discharge and current velocity, or changes in total nitrogen and phosphate, or their combined effects. Significant inter-reach assemblage differences were observed during the both seasons, but wet-season assemblage structure was not directly influenced by any flow-related variable. During the dry season, scouring-tolerant prostrate/adnate diatoms (especially Achnanthes , Cocconeis ) were relatively abundant upstream, whereas intolerant stalked ( Eunotia , Gomphonema ) and mobile diatoms were more numerous downstream. Both low- and high-profile (erect diatoms, Chamaesiphon , Calothrix ) guilds were sensitive to changes in nutrients. Low-flow conditions downstream, surprisingly, enhanced algal diversity, and richness. Based on the linear response of Cocconeis (mainly C. placentula ) to discharge reduction, we recommend that >65% of dry-season discharge should be maintained in downstream reaches in order to sustain near-natural algal assemblages; 32% of discharge is required to avoid substantial alterations in assemblage structure.