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Spatial and seasonal variations in benthic algal assemblages in streams in monsoonal Hong Kong
Yang, Grace Y.1; Tang, Tao2; Dudgeon, David1; Dudgeon, D, Univ Hong Kong, Div Ecol & Biodivers, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
2009-10-01
Source PublicationHYDROBIOLOGIA
ISSN0018-8158
Volume632Issue:1Pages:189-200
AbstractSamples from stone surfaces were collected in pools within four unpolluted hillstreams (two shaded and two unshaded) in monsoonal Hong Kong (lat. 23 degrees N) to elucidate the extent of spatial (within and among streams) and temporal (seasonal) variations in algal biomass and assemblage composition. Sampling continued for over 12 months, incorporating the dry season when streams were at baseflow, and the wet season when spates were frequent. We anticipated that algal biomass would be lower in shaded streams and during the wet season, with associated seasonal differences in assemblage composition or relative abundance of different growth forms (e. g. erect versus prostrate). Benthic chlorophyll a (a proxy for algal biomass) varied among streams from an annual mean of 11.0-22.3 mg m(-2). Dry-season standing stocks were 18% higher than during the wet season when spate-induced disturbance reduced algal standing stocks. Algal biomass varied significantly at the stream scale, but not at the pool scale, and was lower in unshaded streams, where standing stocks may have been limited by high densities of algivorous balitorid loaches (mainly Pseudogastromyzon myersi). An overriding effect of grazers on algal biomass could also have reduced variations resulting from spate-induced disturbance. Significant differences in assemblage composition among streams, which were dominated by diatoms and cyanobacteria (totally 82 taxa) were not systematically related to shading conditions. Seasonal variations in algal assemblages were statistically significant but rather minor, and did not involve major shifts in composition or growth form caused by spate-induced disturbance. The abundance of filamentous cyanobacteria in all the streams may have been due to 'gardening' by balitorid loaches that removed erect or stalked diatoms and favoured cyanobacteria that persist through basal regeneration of filaments. This explanation requires validation through manipulative experiments.; Samples from stone surfaces were collected in pools within four unpolluted hillstreams (two shaded and two unshaded) in monsoonal Hong Kong (lat. 23 degrees N) to elucidate the extent of spatial (within and among streams) and temporal (seasonal) variations in algal biomass and assemblage composition. Sampling continued for over 12 months, incorporating the dry season when streams were at baseflow, and the wet season when spates were frequent. We anticipated that algal biomass would be lower in shaded streams and during the wet season, with associated seasonal differences in assemblage composition or relative abundance of different growth forms (e. g. erect versus prostrate). Benthic chlorophyll a (a proxy for algal biomass) varied among streams from an annual mean of 11.0-22.3 mg m(-2). Dry-season standing stocks were 18% higher than during the wet season when spate-induced disturbance reduced algal standing stocks. Algal biomass varied significantly at the stream scale, but not at the pool scale, and was lower in unshaded streams, where standing stocks may have been limited by high densities of algivorous balitorid loaches (mainly Pseudogastromyzon myersi). An overriding effect of grazers on algal biomass could also have reduced variations resulting from spate-induced disturbance. Significant differences in assemblage composition among streams, which were dominated by diatoms and cyanobacteria (totally 82 taxa) were not systematically related to shading conditions. Seasonal variations in algal assemblages were statistically significant but rather minor, and did not involve major shifts in composition or growth form caused by spate-induced disturbance. The abundance of filamentous cyanobacteria in all the streams may have been due to 'gardening' by balitorid loaches that removed erect or stalked diatoms and favoured cyanobacteria that persist through basal regeneration of filaments. This explanation requires validation through manipulative experiments.
SubtypeArticle
KeywordPeriphyton Cyanobacteria Diatoms Grazers Spates Balitoridae
Department[Yang, Grace Y.; Dudgeon, David] Univ Hong Kong, Div Ecol & Biodivers, Hong Kong, Hong Kong, Peoples R China; [Tang, Tao] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei Province, Peoples R China
Subject AreaMarine & Freshwater Biology
DOI10.1007/s10750-009-9838-1
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Funding OrganizationResearch Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M] ; Research Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M] ; Research Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M] ; Research Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M]
Indexed BySCI
Language英语
WOS Research AreaMarine & Freshwater Biology
WOS SubjectMarine & Freshwater Biology
WOS IDWOS:000268728500012
WOS KeywordFOREST STREAM ; MOUNTAIN STREAM ; PLECOGLOSSUS-ALTIVELIS ; RESOURCE UTILIZATION ; TROPICAL STREAM ; UNSHADED STREAM ; EPILITHIC ALGAE ; GRAZING FISH ; PERIPHYTON ; DISTURBANCE
Funding OrganizationResearch Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M] ; Research Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M] ; Research Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M] ; Research Grants Council of Hong Kong Special Administrative Region, China [[HKU] 7509/06M]
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/7618
Collection期刊论文
Corresponding AuthorDudgeon, D, Univ Hong Kong, Div Ecol & Biodivers, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
Affiliation1.Univ Hong Kong, Div Ecol & Biodivers, Hong Kong, Hong Kong, Peoples R China
2.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei Province, Peoples R China
Recommended Citation
GB/T 7714
Yang, Grace Y.,Tang, Tao,Dudgeon, David,et al. Spatial and seasonal variations in benthic algal assemblages in streams in monsoonal Hong Kong[J]. HYDROBIOLOGIA,2009,632(1):189-200.
APA Yang, Grace Y.,Tang, Tao,Dudgeon, David,&Dudgeon, D, Univ Hong Kong, Div Ecol & Biodivers, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.(2009).Spatial and seasonal variations in benthic algal assemblages in streams in monsoonal Hong Kong.HYDROBIOLOGIA,632(1),189-200.
MLA Yang, Grace Y.,et al."Spatial and seasonal variations in benthic algal assemblages in streams in monsoonal Hong Kong".HYDROBIOLOGIA 632.1(2009):189-200.
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