The effects of silt and sand on the invertebrate fauna of streams and rivers

Chutter, F. M.

doi:10.1007/bf00040323

Cited by 138 publications

(93 citation statements)

References 9 publications

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“…It has been reported that the sediment type (sand vs. mud) is one of the dominant factors responsible for the spatial distribution of macrozoobenthos in terms of feeding types (Chutter, 1969). Suspension feeders (e.g., bivalves) are more abundant on a sand flat where the water velocity prevents the deposition of organic matter on the bottom and the current activity brings more potential food than weaker currents would supply.…”

Section: > Factors Regulating the Macrozoobenthic Assemblagesmentioning

confidence: 99%

Community structure and decadal changes in macrozoobenthic assemblages in Lake Poyang, the largest freshwater lake in China

Cai

Zhen-bin

et al. 2014

Knowl. Managt. Aquatic Ecosyst.

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Key-words:Yangtze River, floodplain lake, macrozoobenthos, community structure, sand mining Lake Poyang is the largest freshwater lake in China and contains unique and diverse biota within the Yangtze floodplain ecosystem. However, knowledge of its macrozoobenthic assemblages remains inadequate. To characterize the current community structure of these assemblages and to portray their decadal changes, quarterly investigations were conducted at 15 sites from February to November 2012. A total of 42 taxa were recorded, and Corbicula fluminea, Limnoperna fortunei, Gammaridae sp., Nephtys polybranchia, Polypedilum scalaenum and Branchiura sowerbyi were found to dominate the community in terms of abundance. The bivalves Corbicula fluminea, Lamprotula rochechouarti, Arconaia lanceolata and Lamprotula caveata dominated the community in biomass due to their large body size. The mean abundance of the total macrozoobenthos varied from 48 to 920 ind·m −2 , the mean biomass ranged from 28 to 428 g·m −2 . The substrate type affected strongly the abundance, biomass, and diversity of the macrozoobenthos, with muddy sand substrates showing the highest values. Compared with historical data, remarkable changes were observed in the abundance of macrozoobenthos and the identity of the dominant species. The mean total abundance decreased from 724 ind·m −2 in 1992 to 228 ind·m −2 in 2012. The dominant species have shifted dramatically. Large unionids were dominant before 1998, whereas pollution-tolerant species (e.g., Branchiura sowerbyi) increased in dominance after 2008. Our findings should have implications for the conservation of the benthic biodiversity of this large Yangtzeconnected lake. RÉSUMÉLa structure des communautés et les changements décennaux dans les assemblages du macrozoobenthos du lac Poyang, le plus grand lac d'eau douce en Chine Mots-clés :fleuve Yangtze, Le lac Poyang est le plus grand lac d'eau douce en Chine et contient des biotes uniques et diversifiés de l'écosystème de la plaine inondable du Yangtzé. Cependant, la connaissance de ses assemblages macrozoobenthiques reste insuffisante. Pour caractériser la structure de la communauté actuelle de ces assemblages et présenter leurs changements décennaux, des inventaires

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Section: > Factors Regulating the Macrozoobenthic Assemblagesmentioning

confidence: 99%

Community structure and decadal changes in macrozoobenthic assemblages in Lake Poyang, the largest freshwater lake in China

Cai

Zhen-bin

et al. 2014

Knowl. Managt. Aquatic Ecosyst.

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“…This is in agreement that increased silt sedimentation reduces the abundance of benthic invertebrates and species diversity and richness. (Chutter, 1969;Brusven & Prather, 1974;Ewa-Oboho, 1992). The decrease in abundance of the herbivorous fish T. guineensis as a result of increased silt sedimentation may be ascribed to the effect of turbidity and scouring on algal production, besides the development of unstable substratum for attachment.…”

Section: Resultsmentioning

confidence: 99%

Ecological effects of channelization on a tropical marine ecosystem: Impact on intertidal fish communities in the Cross River, Nigeria

Ewa-Oboho¹

2009

West African Journal of Applied Ecology

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The impact of bulk density silt/clay sedimentation from dredging in the Cross River Estuary (S. E. Nigeria) on fish was assessed through the use of community structural analysis and ecological procedures emphasizing reproduction and feeding characteristics. The distinction among the channel, creeklet and pool fish communities decreased as the percentage of silt/clay substrate increased. The abundance of benthic invertivore and herbivore fish groups declined significantly, as the percentage of silt increased for the channel fish dwellers. This is because the simple and lithophilous reproduction category requires clean and coarse substrates for spawning. All species affected by increased silt sedimentation within a guild were significantly similar in trends of abundance. The ecological implication of these findings is the similar response of fish species of similar ecological niches to excessive turbidity.

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“…Celle des deux sites d'amont (# 1 & 2) est très réduite, dominée par les Oligochètes, en particulier les Tubifex et autres Tubificidae à soies capillaires. Ce type de dominance est d'ailleurs caractéristique des milieux à forte pollution organique (CHUTTER, 1969 ;CLAVEL état., 1979 ;ROSILLON, 1983) ou à substrats très fins (PETRAN et KOTHE, 1978 ;DA COSTA, 1982 WINTERBOURN, 1979) et en France (ECHAUBARD et NEVEU, 1975).…”

Section: -Discussionunclassified

Effets de travaux de curage sur la faune benthique d'un cours d'eau d'une région agricole du Québec

Harper¹,

Cloutier²

2005

rseau

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Une étude quantitative et qualitative du benthos du Ruisseau des Anges (Comté de Montcalm, Québec), un bassin à vocation agricole, réalisée de 1986 à 1988, a permis d'évaluer les effets d'un curage effectué en 1987.L'échantillonnage couvrait les zones d'amont destinées être curés, ainsi que des sites en aval des travaux et des sites témoins. Les cours d'eau y sont enrichis, principalement en azote, et le benthos s'avère dominé par les Oligochètes Tubificidae. Mémo la station-témoin, située dans une zone plus boisée, contient une faune appauvrie, bien que plus diversifiée, dominée par les Diptères Chironomidae, les Mollusques Sphaeriidae, les Coléoptères Elmidae et les Mégaloptères Sialidae, groupes résistants à la pollution. Le curage a éliminé les accumulations de boues organiques, ainsi que les plantes aquatiques qui les retenaient, et favorisé la colonisation du milieu par les Diptères Chironomidae. Cependant, dès l'automne suivant (1988), l'envasement avait repris et les Tubificidae avaient recouvré leur position de dominance, particulièrement dans les stations d'amont, sans toutefois atteindre les densités de 1986. Les bénéfices du curage sur le benthos ont été de faible importance et de courte durée, dans la mesure où l'envasement et la pollution organique maintiennent des conditions de dégradation en absence de mesures efficaces de contrôle de l'érosion. L'utilisation de plusieurs indices biotiques pour décrire l'état des cours d'eau illustre la difficulté de leur application à des cours d'eau de plaine.A quantitative and qualitative study of the benthos of Ruisseau des Anges (Montcalm County, Quebec), in an agricultural area, in 1986 to 1988 was undertaken to evaluate the effects of ditching operations in 1987.Sampling included upstream zones where the ditching occurred, downstream stations, and control areas. All streams were enriched, particularly in nitrogen, and their benthic fauna was dominated by Tubificidae (Oligochaeta). Even the control area had a reduced fauna dominated by Chironomidae (Diptera), Sphaeriidae (Mollusca), Elmidae (Coleoptera) and Sialidae (Megaloptera), all resistant to pollution. The ditching operations eliminated the accumulated mud and destroyed the vegetation winch choked the streams. This allowed a colonization by Chironomidae. However, by the fall of 1988 much silting had occurred and the Tubificidae reestablished, though not in the high densities of 1986. Any improvement of the benthic fauna was marginal and shortlived, as silting and organic pollution restored the degradated conditions in the absence of erosion control. The use of several biotic indices to assess stream conditions showed that these are often unsatisfactory in lowland streams

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The effects of silt and sand on the invertebrate fauna of streams and rivers

Cited by 138 publications

References 9 publications

Community structure and decadal changes in macrozoobenthic assemblages in Lake Poyang, the largest freshwater lake in China

Community structure and decadal changes in macrozoobenthic assemblages in Lake Poyang, the largest freshwater lake in China

Ecological effects of channelization on a tropical marine ecosystem: Impact on intertidal fish communities in the Cross River, Nigeria

Effets de travaux de curage sur la faune benthique d'un cours d'eau d'une région agricole du Québec

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