ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

Plant palatability and disturbance level in aquatic habitats: an experimental approach using the snail Lymnaea stagnalis (L.) (2002)

ELGER, ARNAUD ; BARRAT-SEGRETAIN, MARIE-HÉLÈNE ; AMOROS, CLAUDE

Oxford UK : Blackwell Science Ltd

Freshwater biology 47 (2002), S. 0

add to mindlist on the mindlist

Details

ISSN: 1365-2427

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: 1. The palatability of aquatic macrophytes to the snail Lymnaea stagnalis was investigated in the laboratory. Eight species of macrophyte were selected from habitats that differed in either flood disturbance regime or nutrient status.2. In a non-choice test, single macrophyte species were offered to individual snails. The average amount of plant dry mass consumed per Lymnaea dry mass ranged from 3.6 ± 1.4 (±SE) to 63.6 ± 13.9 mg g–1 day–1 across plant species. In a choice test, all eight plant species were presented simultaneously to sets of five snails. The average total consumption was 66.1 ± 3.8 mg g–1 day–1 and the maximum average consumption for a single plant was 26.2 ± 3.6 mg g–1 day–1.3. In both tests, the amount consumed by snails differed significantly between the plant species. The species growing in undisturbed habitats were the least consumed. Habitat nutrient status was unrelated to plant palatability.4. These results suggest that macrophyte species growing in habitats that are rarely disturbed by floods allocate a greater proportion of their resources to resisting herbivory.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00820.x

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

2

Electronic Resource

Theoretical habitat templets, species traits, and species richness: aquatic macrophytes in the Upper Rhône River and its floodplain (1994)

BORNETTE, GUDRUN ; HENRY, CHRISTOPHE ; BARRAT, MARIE-HÉLÈNE ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Freshwater biology 31 (1994), S. 0

add to mindlist on the mindlist

Details

ISSN: 1365-2427

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: 〈list xml:id="l1" style="custom"〉1The objective of this study, which is based on forty-two species of hydrophytes and helophytes, is to investigate: (i) relationships among species traits; (ii) habitat utilization by species; (iii) the relationship between species traits and habitat utilization; (iv) trends in species traits in the framework of spatial–temporal habitat variability, and if trends match predictions from the river habitat templet; and (v) trends in species richness in the framework of spatial–temporal habitat variability, and if trends match predictions of the patch dynamics concept.2Two data sets were used for this analysis: species traits (mainly reproductive and morphological characteristics) were documented from the literature; and species distribution across eight habitat types was from field surveys conducted in the floodplain of the Upper Rhone River, France. This information was structured by a fuzzy coding technique and analysed by ordination methods.3Several species traits, which are related to disturbances and reflect resistance (e.g. attachment to soil or substrate) or resilience (e.g. potential for regeneration of an individual), are closely related for aquatic macrophytes.4Habitat utilization by aquatic macrophytes separates the habitat types along a gradient of connectivity with the main channel, which corresponds to a gradient in flood disturbance frequency and the permanence of the different water-bodies.5The relationship between species traits and habitat utilization is highly significant, indicating that a particular set of habitat types is used by taxa with a particular set of species trait modalities.6Observations in one habitat templet (in which scaling of the templet is primarily based on water level fluctuations for the temporal variability axis and on substrate characteristics for the spatial variability axis) generally do not support predictions on trends in species traits but do support predictions on trends in species richness.7Observations in an alternative habitat templet (in which scaling of the templet is based on frequency of flood scouring for the temporal variability axis and on heterogeneity of the substrate for the spatial variability axis) support theoretical predictions on trends for about half of the species traits for which predictions were available. However, trends in species richness in this alternative habitat templet are only partly in agreement with predictions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-2427.1994.tb01753.x

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

3

Electronic Resource

Aquatic plant diversity in riverine wetlands: the role of connectivity (1998)

Bornette, Gudrun ; Amoros, Claude ; Lamouroux, Nicolas

Oxford, UK : Blackwell Science Ltd, UK

Freshwater biology 39 (1998), S. 0

add to mindlist on the mindlist

Details

ISSN: 1365-2427

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: 1. The hypothesis was tested that intermediate connectivity to a river results in propagule inputs to wetlands, whereas excessive connectivity impedes recruitment, and insufficient connectivity causes less competitive species to be eliminated, with no recruitment of new species. As a consequence, very low or very high nutrient levels should decrease species richness by selecting specialized species, whereas intermediate nutrient levels should favour the co-occurrence of species with contrasting nutrient requirements.2. Among cut-off channels with high sinuosity and which are infrequently flooded by the river (low flood scouring), one example possesses high species richness because most species are saved from extinction by long-term isolation of the channel and cold groundwater supplies. Other channels are poorly supplied with groundwater and show a lower richness of species, because of low propagule inputs and low recruitment potential.3. Cut-off channels with low sinuosity and which are flooded at intermediate frequencies were divided into three groups. The first group was species-poor, being closely connected to the river through downstream backflows which maintain nutrient-rich and turbid waters, in keeping with the hypothesis. The second group presents intermediate richness caused by: (i) lower river backflows; and (ii) floods that partly scour substrate and plants, and afford regeneration niches for transported propagules. The third group was species-poor because of excessive groundwater supplies, which probably acted as a limiting factor for species growth and recruitment.4. The most frequently flooded channel shows the highest species richness, and occurrence of rare and fugitive species, because of floods which compensate competition by scouring sediments and plants, and afford regeneration niches for propagules. In this case, conservation of biodiversity necessitates propagule sources at the level of the river landscape.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-2427.1998.00273.x

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

4

Electronic Resource

River incision and vegetation dynamics in cut-off channels (1996)

Bornette, Gudrun ; Amoros, Claude ; Rostan, Jean-Claude

Springer

Aquatic sciences 58 (1996), S. 31-51

add to mindlist on the mindlist

Details

ISSN: 1420-9055

Keywords: Aquatic plants ; Ain River ; entrenchment ; groundwater

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The consequences of river incision on ecosystems dynamics in cut-off channels were hypothesized to be 1) the reduction of river backflows and overflows of the river in the former channels; 2) the reduction of seepage flows from the river and drainage into the channels; 3) the drainage of the hillslope aquifer by the former channels. The subsequent changes of aquatic plant communities should be 1) the terrestrialization of the higher part of former channels and 2) their change into more oligotraphent ones if the hillslope aquifer is poorer in nutrients than the river. In those reaches where the river bed is aggraded, river backflows in the cut-off channel should increase, as should overflows and seepage, and more eutraphent species should develop. Changes in aquatic vegetation were studied over a ten-year period in four cut-off channels supplied by a nutrient-poor hillslope aquifer and a nutrient-rich river. Two of them were located in an incised reach of the river, one in an aggraded reach and one (reference) in a reach that was neither aggraded nor incised. The vegetation of the reference channel exhibited only minor changes over the ten-year period, indicating that the successional trend is not perceptible at the time scale of the study, and thus that any change observed in the other channels can be ascribed to river incision or aggradation. Terrestrialization expected in the channels located in the incised reach clearly progressed in the downstream parts, but was inhibited by groundwater supplies in the upper parts. As expected, oligotraphent communities progressed or remained dominant in the upper part. The channel located in the aggraded reach of the river exhibited the highest floristic changes. As expected, eutraphent communities progressed in this channel, but unexpectedly, terrestrialization also progressed in the upstream part. Alternative explanations are: 1) aggradation could have instigated more backflows and overflows without modifying significantly the mean water-level and 2) more frequent water overflows could have favoured alluvial deposition and thus terrestrialization.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00877639

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

5

Electronic Resource

The reversible process concept applied to the environmental management of large river systems (1987)

Amoros, Claude ; Rostan, Jean -Claude ; Pautou, Guy ; [et al.]

Springer

Environmental management 11 (1987), S. 607-617

add to mindlist on the mindlist

Details

ISSN: 1432-1009

Keywords: Landscape ecology ; Wetlands ; Ecological succession ; Spatiotemporal scales ; Stability, recovery

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract The wetland ecosystems occurring within alluvial floodplains change rapidly. Within the ecological successions, the life span of pioneer and transient stages may be measured in several years or decades depending on the respective influences of allogenic (water dynamics, erosion, and deposition) and autogenic developmental processes (population dynamics, eutrophication, and terrestrialization). This article emphasizes the mechanisms that are responsible for the ecosystem changes and their importance to environmental management. Two case studies exemplify reversible and irreversible successional processes in reference to different spatial and temporal scales. On the scale of the former channels, the standing-water ecosystems with low homeostasis may recover their previous status after human action on the allogenic processes. On the scale of a whole reach of the floodplain, erosion and deposition appear as reversible processes that regenerate the ecological successions. The concepts of stability and reversibility are discussed in relation to different spatiotemporal referential frameworks and different levels of integration. The reversible process concept is also considered with reference to the energy inputs into the involved subsystems. To estimate the probability of ecosystem regeneration or the cost of restoration, a concept of “degrees of reversibility” is proposed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01880159

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

6

Electronic Resource

Restoration ecology of riverine wetlands: II. An example in a former channel of the Rhône River (1995)

Henry, Christophe P. ; Amoros, Claude ; Giuliani, Yves

Springer

Environmental management 19 (1995), S. 903-913

add to mindlist on the mindlist

Details

ISSN: 1432-1009

Keywords: Biodiversity ; Eutrophication ; Groundwater supply ; interdisciplinary cooperation ; Reversible processes ; Terrestrialization

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract Riverine wetlands, which provide numerous valuable functions, are disappearing in floodplains of a channelized European river. A restoration project has been proposed by scientists to restore a former braided channel of the Rhône River by the removal of fine organic sediments in order to enhance groundwater supply. A precise and intensive prerestoration monitoring program during one year (including comparison with a reference channel) has taken into account several variables and ecological performance indicators measured at various spatial and temporal scales. Three restoration techniques were then suggested, taking into account two characteristics of ecosystem functions for increasing restoration success and self-sustainability: (1) the riparian forest as well as the shores must be preserved or disturbed as little as possible; and (2) the upstream alluvial plug must be preserved to prevent direct supply of nutrientrich water from the Rhône River. Among the three restoration options proposed, it was not possible to carry out the less ecologically disturbing one as it was considered too expensive, time consuming, and difficult to realize. A precise and intensive postrestoration monitoring program, conducted over two years, demonstrated restoration success but also unpredicted problems, such as a locally thick layer of fine organic sediment. As long as a self-sustainable state is not achieved, this monitoring should be continued. Afterwards, a less precise and less intensive long-term monitoring should enable the detection of future events that may influence ecosystem changes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02471941

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

7

Electronic Resource

A Vegetation-Based Method for Ecological Diagnosis of Riverine Wetlands (2000)

Amoros, Claude ; Bornette, Gudrun ; Henry, Christophe Pascal

Springer

Environmental management 25 (2000), S. 211-227

add to mindlist on the mindlist

Details

ISSN: 1432-1009

Keywords: KEY WORDS: Aquatic macrophytes; Ecological processes; Ecosystem dynamics; Disturbance; Environmental management; Sustainability; Restoration

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s002679910017

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

8

Electronic Resource

Restoration ecology of riverine wetlands: I. A scientific base (1995)

Henry, Christophe P. ; Amoros, Claude

Springer

Environmental management 19 (1995), S. 891-902

add to mindlist on the mindlist

Details

ISSN: 1432-1009

Keywords: Biodiversity ; Ecological concepts ; Evaluation ; Interdisciplinary cooperation ; Monitoring ; Restoration ; Reversible processes ; River channels

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract Ecological restoration is a recent discipline that should be conducted scientifically and rigorously to move from a trial-and-error process to a predictive science to increase its success and the self-sustainability of restored ecosystems. The recent research developments in ecosystem dynamics allow scientists to provide a strong theoretical base for restoration ecology. Most large rivers have been degraded and managed by various agencies, but riverine wetlands are now recognized as providing numerous valuable functions. Numerous opportunities are available to ecologically restore wetlands disappearing through terrestrialization. After a brief description and discussion of several restoration projects carried out in riverine wetlands, we propose precise recommendations for future restoration projects, which should include the following essential steps: (1) increase restoration legitimacy with a team of interdisciplinary scientists working on the project—it can thus be conducted on a strong theoretical base derived from recent ecological concepts; (2) define precise and correct restoration mission, goals, and objectives, and appropriate performance indicators of restoration success or failure; and (3) monitor ecosystem changes both before and after the restoration, and compare these changes with changes observed in reference ecosystems.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02471940

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

9

Electronic Resource

Are the banks a source of recolonization after disturbance: an experiment on aquatic vegetation in a former channel of the Rhône River (1996)

Henry, Christophe P. ; Amoros, Claude

Springer

Hydrobiologia 330 (1996), S. 151-162

add to mindlist on the mindlist

Details

ISSN: 1573-5117

Keywords: ecosystem restoration ; experimental disturbance ; macrophytes ; recolonization ; refuge ; regeneration niche ; Rhône River

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Recolonization of vegetation on 1 m2 quadrats was surveyed after a major disturbance induced by a restoration experiment, carried out by dredging in a former river channel. Various spatial and temporal patterns of recolonization were determined by the analysis of vegetation (re-)establishment on adjacent quadrats located along transects from one bank to the other in several zones. Most species, except emergent species that remained on bank quadrats (e.g. Phalaris arundinacea), initially (re-)established on the banks and later expanded towards the center of the channel (e.g. Callitriche platycarpa). Several species (re-)established simultaneously on both bank and center quadrats, and this in all three zones (e.g. Nasturtium officinale, Potamogeton pusillus). This suggests that the fine sediment contains a propagule bank. New species (not observed prior to restoration) generally established on the center quadrats first (e.g. Groenlandia densa), suggesting immigration via propagule drift. At the channel scale, several species (re-)established first upstream and then downstream (e.g. Nasturtium officinale), confirming the role of propagule drift from upstream habitats. Few species (re-)established downstream first (e.g. Callitriche platycarpa). Recolonization patterns of dominant species (location and timing of (re-)establishment) are related to biological traits such as the efficiency and means of reproduction.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00020004

Permalink