Alien aquatic macroinvertebrates along the lateral dimension of a large floodplain

Besacier-Monbertrand, Anne-Laure; Paillex, Amael; Castella, Emmanuel

doi:10.1007/s10530-009-9632-z

Cited by 11 publications

(9 citation statements)

References 51 publications

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“…Indeed, most of the alien species identified in the Rhône River floodplain are rheophilous (i.e. adapted to flow), and the main channel is considered as the main invasion pathway for these species (Besacier-Monbertrand, Paillex & Castella, 2010). We would expect similar patterns to exist in other river systems, as many European freshwater alien invaders can disperse rapidly along riverine corridors and are typically well adapted to lotic systems (Statzner et al, 2008).…”

Section: Alien Species Are Encouraged By Restoration Operationsmentioning

confidence: 98%

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Testing predictions of changes in alien and native macroinvertebrate communities and their interaction after the restoration of a large river floodplain (French Rhône)

et al. 2015

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1. Large river floodplains contain a high diversity of habitats and species but are highly threatened by human activities. River floodplain restoration is increasingly undertaken to reverse biodiversity loss and enhance ecosystem services. 2. Few studies have examined the consequences on the biota of restoring lateral connectivity, a key variable that represents the exchange of materials and organisms between the river and its floodplain. We developed models to describe the richness and abundance of aquatic macroinvertebrates in 18 channels of the Rh^one floodplain and predict how restoration (i.e. the increase in lateral connectivity of floodplain channels) should alter the native and alien communities. 3. Models quantified how richness and abundance decrease for lentic taxa and increase for lotic and alien taxa with higher connectivity between the floodplain channels and the main channel. Predicted changes were weakly related to overall observed changes when all restored channels were combined, but consistent with observed changes when floodplain channels were grouped by restoration type. We highlighted that restoration interventions modifying lateral connectivity induced a change of lentic and lotic taxa richness in accordance with the predictions. Richness of alien taxa was favoured by restoration more than predicted; however, no interaction between alien species changes and native species was detected after restoration. 4. Restoration of the ecosystem predictably transformed native communities and encouraged alien species, at least over the 4 years studied. Our findings demonstrate that lateral connectivity is a key variable driving macroinvertebrate communities in large river floodplains and that the response of macroinvertebrates to restoration of a disturbance-driven ecosystem can in part be predicted. Therefore, the outcome of restoration programmes can be optimised by quantifying lateral connectivity before and after restoration

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Section: Alien Species Are Encouraged By Restoration Operationsmentioning

confidence: 98%

“…adapted to flow), and the main channel is considered as the main invasion pathway for these species (Besacier-Monbertrand, Paillex & Castella, 2010). Indeed, most of the alien species identified in the Rhône River floodplain are rheophilous (i.e.…”

Section: Alien Species Are Encouraged By Restoration Operationsmentioning

confidence: 99%

Testing predictions of changes in alien and native macroinvertebrate communities and their interaction after the restoration of a large river floodplain (French Rhône)

et al. 2015

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“…According to previous studies, we predicted the changes in macroinvertebrate composition to be related to changes in the lateral connectivity associated to the different restoration measures (Tockner et al ., ; Reckendorfer et al ., ). Given the predominantly rheophilic nature of the EPT and the alien species, we predicted an increase of these taxa with an increase of lateral connectivity by restoration measures (Usseglio‐Polatera, ; Besacier‐Monbertrand et al ., ). We expected maximal changes of all metrics in the channels fully reconnected with the river.…”

Section: Introductionmentioning

confidence: 97%

Short‐term Impacts of Lateral Hydrological Connectivity Restoration on Aquatic Macroinvertebrates

Besacier-Monbertrand

Paillex

Castella

2012

River Research & Apps

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In floodplain ecosystems, the lateral hydrological connectivity between the main river channel and the secondary channels plays a major role in shaping both the habitat conditions and the macroinvertebrate diversity. Among other threats, human activities tend to reduce the lateral connectivity, which increases floodplain terrestrialization and induces a loss of aquatic biodiversity. Consequently, the restoration of lateral connectivity is of growing concern. We studied four secondary channels of the Rhône floodplain that were subjected either to no restoration or to three different restoration measures (river flow increase only, flow increase plus dredging and flow increase plus reconnection to the river). Macroinvertebrate and environmental data were analysed one year before and during a period of five years after restoration. We expected a progressive increase of lateral connectivity according to the type of restoration. Changes in macroinvertebrate assemblages were predicted to be towards more rheophilic communities and proportionally related to the changes in lateral connectivity.In the reconnected channel, lateral connectivity increased and remained high five years after restoration. In the dredged channel, the immediate increase of the lateral connectivity metric induced by sediment removal was followed by a rapid decrease. In the unrestored channel and the channel only influenced by flow increase, the metric remained constant in time. The macroinvertebrate composition and the rarefied EPT richness changes were proportionally related to the changes in lateral connectivity. Alien species richness and densities increased progressively in all channels after restoration. Our results showed that modifications of the lateral connectivity lead to predictable changes in macroinvertebrate diversity. Synergistic interactions between restoration and longer‐term changes (e.g. climatic change, invasion of alien species) encourage long‐term monitoring to assess the durability and trends of restoration measures. Copyright © 2012 John Wiley & Sons, Ltd.

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“…controls) or subjected to a variety of restoration works, (ii) develop habitat models relating the density of many taxa to a surrogate of lateral connectivity, (iii) test the efficiency of the habitat models (developed using pre-restoration data only) for predicting observed changes (OC) after restoration. Barrat-Segretain, 2001;Besacier-Monbertrand, Paillex & Castella, 2010) and (iii) the potential loss of the more disconnected waterbodies, which can act as biodiversity reservoirs (e.g. The latter was chosen because maintaining or increasing the diversity of aquatic habitats among waterbodies at the floodplain scale was an aim of the restoration.…”

Section: Introductionmentioning

confidence: 99%

“…Sullivan & Watzin, 2009;Bolland et al, 2012), (ii) the potential homogenising effect of spreading alien species with high colonising potential (e.g. Barrat-Segretain, 2001; Besacier-Monbertrand, Paillex & Castella, 2010) and (iii) the potential loss of the more disconnected waterbodies, which can act as biodiversity reservoirs (e.g. Schomaker & Wolter, 2011).…”

Section: Introductionmentioning

confidence: 99%

Realised and predicted changes in the invertebrate benthos after restoration of connectivity to the floodplain of a large river

et al. 2015

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1. River–floodplain interactions (i.e. lateral connectivity) are a major driver of the structure and function of the biota in floodplain waterbodies. Therefore, the enhancement of lateral connectivity is a key focus of large river restoration. The Rhône River restoration project in France includes an array of floodplain habitats and restoration measures, offering opportunities to test the predictability of changes in taxon abundance after connectivity restoration. 2. Quantitative samples of benthic macroinvertebrates taken before restoration were used to derive generalised additive models (GAMs) relating the density of taxa to an index of lateral connectivity. The index combined the diversity of sediment grain size, its organic content, vegetation cover and the water’s electrical conductivity. GAMs were used to predict changes in taxon density and between-site (i.e. beta) diversity 2 and 4 years after restoration at 34 sites (14 unrestored, eight reconnected to the river, six dredged, six restored by increasing river flow). 3. Observed post-restoration changes included an increase in the density of rheophilous taxa and an increase of beta-diversity among restored sites. Fifty-four GAMs (27% of the taxa) were selected for post-restoration predictions. Predictions from these models matched observations for a set of Trichoptera and other taxa with large density changes after restoration. The quality of predictions of density changes was poor on average among sites, but higher for sites where large changes in lateral connectivity occurred. Taxon-level predictions partly explained increased beta-diversity in restored sites, suggesting that predictions based on a subset of individual taxa can be used to predict community-level changes. 4. Our models can guide restoration measures in the Rhône and other rivers. Our results also show the benefit of diversifying restoration actions at the scale of entire floodplains. Post-restoration trajectories should be monitored over long periods to improve the identification of the key environmental predictors of biotic changes, especially at the less connected floodplain sites

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Alien aquatic macroinvertebrates along the lateral dimension of a large floodplain

Cited by 11 publications

References 51 publications

Testing predictions of changes in alien and native macroinvertebrate communities and their interaction after the restoration of a large river floodplain (French Rhône)

Testing predictions of changes in alien and native macroinvertebrate communities and their interaction after the restoration of a large river floodplain (French Rhône)

Short‐term Impacts of Lateral Hydrological Connectivity Restoration on Aquatic Macroinvertebrates

Realised and predicted changes in the invertebrate benthos after restoration of connectivity to the floodplain of a large river

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