Surface water connection and the macrozoobenthos of two types of floodplains on the upper rhine

Obrdlik, Petr; Fuchs, Ulrike

doi:10.1002/rrr.3450060406

Cited by 23 publications

(24 citation statements)

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“…First, the pattern of species richness in Poyang Lake and other waters conforms to the theory that α-diversity of macrobenthos in fl oodplain waters reaches a maximum at an intermediate level of connectivity (Obrdlik and Fuchs 1991;Tockner et al 1999;Ward et al 1999;Amoros and Bornette 2002). As already mentioned, the connected lake Poyang, which has the level of connectivity between disconnected lakes and rivers, is most species rich.…”

Section: Ecological Role Of Benthos In Poyang Lakesupporting

confidence: 81%

Macrozoobenthic community of Poyang Lake, the largest freshwater lake of China, in the Yangtze floodplain

Wang

Cui

et al. 2007

Limnology

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Poyang Lake (Poyang Hu) is located at the junction of the middle and lower reaches of the Yangtze (Changjiang) River, covering an area of 3283 km 2 . As one of the few lakes that are still freely connected with the river, it plays an important role in the maintenance of the unique biota of the Yangtze fl oodplain ecosystem. To promote the conservation of Poyang Lake, an investigation of the macrobenthos in the lake itself and adjoining Yangtze mainstream was conducted in 1997-1999. Altogether 58 benthic taxa, including 22 annelids, 8 mollusks, 26 arthropods, and 2 miscellaneous animals, were identifi ed from quantitative samples. The benthic fauna shows a high diversity and a marine affi nity. The standing crops of benthos in the lake were much higher than those in the river, being 659 individuals/m 2 and 187.3 g/m 2 (wet mass) in the main lake, and 549 individuals/m 2 and 116.6 g/m 2 in the lake outlet, but only 129 individuals/m 2 and 0.4 g/m 2 in the river. The dominant group in the lake was Mollusca, comprising 63.4% of the total in density and 99.5% in biomass. An analysis of the functional feeding structure indicated that collectorfi lterers and scrapers were predominant in the lake, up to 42.2% and 24.7% in density and 70.2% and 29.2% in biomass, respectively, while shredders and collector-gatherers were relatively common in the river. The present study was restricted to the northern outlet and the northeast part of Poyang Lake. A scrutiny is required for the remaining areas.

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Section: Ecological Role Of Benthos In Poyang Lakesupporting

confidence: 81%

Macrozoobenthic community of Poyang Lake, the largest freshwater lake of China, in the Yangtze floodplain

Wang

Cui

et al. 2007

Limnology

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“…It was partially consistent with the observations of OBRDLIK & FUCHS (1991), who reported the highest species richness from small water bodies within the active floodplain of the Rhine River. However, considerable species richness and diversity were found not only within the natural floodplain of the lower Bug River, but also in some habitats located within the active one, constrained by flood control embankment, as well as in the former one.…”

Section: Discussionsupporting

confidence: 91%

Diversity of aquatic malacofauna of temporary water bodies within the lower Bug River floodplain

Jurkiewicz-Karnkowska¹

2011

Folia Malacologica

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This study analyses the composition, species richness and diversity (H') of aquatic molluscan communities in temporary water bodies within the valley of the lower Bug River in eastern Poland. The investigations were carried out in 2007-2009 within the section of the valley located between 190th and 50th km of the river course in 50 water bodies. Relatively rich and diverse malacofauna was found in the investigated habitats: 32 snail species and 6 bivalve species. Species diversity (H') in individual water bodies ranged from 0.44 to 3.48. About 40% of all mollusc species showed frequencies of £10%. Dominance patterns varied much among the water bodies. Mollusc abundance ranged from 20 to over 1,800 indiv./m 2 . Considerable species richness and diversity were found both within the active floodplain and the former one. This was probably related to the long duration of many of the investigated water bodies, as well as their periodical hydrological connectivity with permanent ones or river channel. From 9 to 12 samples should be enough to compile representative species list of molluscs inhabiting temporary water bodies, but as many as 28-40 samples would be necessary to obtain complete dataset.

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“…If the highest species richness is always found in backwaters (Bis & Palm 1990, Tockner & Bretschko 1996, it is also, for the most part, positively correlated with the highest degree of connectivity (Gepp et al 1985). For exemple, Obrdlik & Fuchs (1991) collected 19 species of gastropods in the stable backwaters versus 30 species in the regularly flooded ones. In the same way, Tockner & Bretschko (1996) observed the maximum macroinvertebrate diversity in plesiopotamal waterbodies, a geomorphological type defined as connected to the main channel 43 to 160 days per annum.…”

Section: Discussionmentioning

confidence: 99%

Importance of floodplain waters for the conservation of chironomid (Diptera) biodiversity in a 6^thorder section of the Garonne river (France)

Garcia

Laville

2001

Ann. Limnol. - Int. J. Lim.

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The chironomid populations of a 6 th order section (400 m) of the middle Garonne river were studied monthly from September 1996 to October 1997.For the first time the main channel of the river was investigated including two floodplain waters : a side arm and an oxbow. Two sampling techniques were used for drift and benthic collections. A total of 21 766 specimens (pupae and pupal exuviae) were sorted and 137 species were identified. Among these, 12 species are new for the fauna of France : their ecology and biogeography are given. The chironomid population of the backwaters is especially diverse and distinctive since the waterbody is disconnected from the main channel.The studied section appears to be transitional corresponding with the epipotamal-metapotamal zones. The embankment of the watercourse since 1958, which has isolated floodplain waters and increased the current velocity in the main channel, mainly explains the dual typologie status observed. The main channel is colonised by rheophilous Orthocladiinae whereas the backwaters shelter a mixed population of limnophilous Chironominae and potamobiont Orthocladiinae.This study demonstrates the urgency for preserving floodplain waters because of their species richness, their uniqueness and their faunal interaction with the main channel. The strong faunal contribution of floodplain waters highlights the topicality and the value in investigating the less disturbed potamal zones of large rivers to increase our knowledge on biodiversity, ecology and biogeography of chironomid populations.Importance des annexes fluviales pour le maintien de la biodiversité des Chironomidés (Diptera) sur une section d'ordre 6 de la Garonne (France) Mots-clés : Diptera, Chironomidae, Garonne, zone potamique, annexes fluviales, biodiversité. . Cette étude montre la nécessité de préserver de telles zones annexes en raison de leur richesse, de leur spécificité et de leur interaction faunistique avec le chenal principal. La forte contribution faunistique des annexes fluviales souligne l'intérêt et l'actualité de prospecter les zones potamiques les moins perturbées des grandes rivières pour une meilleure connaissance de la biodiversité, de l'écologie et de la biogéographie des populations chironomidiennes.

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Surface water connection and the macrozoobenthos of two types of floodplains on the upper rhine

Cited by 23 publications

References 2 publications

Macrozoobenthic community of Poyang Lake, the largest freshwater lake of China, in the Yangtze floodplain

Macrozoobenthic community of Poyang Lake, the largest freshwater lake of China, in the Yangtze floodplain

Diversity of aquatic malacofauna of temporary water bodies within the lower Bug River floodplain

Importance of floodplain waters for the conservation of chironomid (Diptera) biodiversity in a 6^thorder section of the Garonne river (France)

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Surface water connection and the macrozoobenthos of two types of floodplains on the upper rhine

Cited by 23 publications

References 2 publications

Macrozoobenthic community of Poyang Lake, the largest freshwater lake of China, in the Yangtze floodplain

Macrozoobenthic community of Poyang Lake, the largest freshwater lake of China, in the Yangtze floodplain

Diversity of aquatic malacofauna of temporary water bodies within the lower Bug River floodplain

Importance of floodplain waters for the conservation of chironomid (Diptera) biodiversity in a 6thorder section of the Garonne river (France)

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Importance of floodplain waters for the conservation of chironomid (Diptera) biodiversity in a 6^thorder section of the Garonne river (France)