Patterns in fish assemblages in the Loire floodplain: The role of hydrological connectivity and implications for conservation

Lasne, Émilien; Lek, Sovan; Laffaille, Pascal

doi:10.1016/j.biocon.2007.07.002

Cited by 96 publications

(95 citation statements)

References 36 publications

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“…Roach et al (2009), using stable isotope analysis, found that lateral movement of fishes between channel and floodplain habitats in Venezuela was an important factor in the net transfer of organic carbon. Similarly, Lasne et al (2007) conclude that there is a need for a high level of connectivity between the main channel and the floodplain in the Loire River to conserve native fish diversity. In particular, they indicated that the number of native species increased with increasing connectivity, while the number of exotic species present increased with increasing isolation from the main channel.…”

Section: River Height and Lateral Fish Movementmentioning

confidence: 95%

The effect of water level on lateral movements of fish between river and off-channel habitats and implications for management

Lyon

Stuart

Ramsey

et al. 2010

Mar. Freshwater Res.

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Abstract. Off-channel habitats, such as wetlands and backwaters, are important for the productivity of river systems and for many species of native fish. This study aimed to investigate the fish community, timing and cues that stimulated movement to and from off-channel habitats in the highly regulated Lake Hume to Lake Mulwala reach of the Murray River, south-eastern Australia. In 2004-05, 193 712 fish were collected moving bi-directionally between a 50-km section of the Murray River and several off-channel habitats. Lateral fish movements approximated water level fluctuations. Generally as water levels rose, fish left the main river channel and moved into newly flooded off-channel habitats; there was bidirectional movement as water levels peaked; on falling levels fish moved back to the permanent riverine habitats. Fish previously classified as 'wetland specialists', such as carp gudgeons (Hypseleotris spp.), have a more flexible movement and life-history strategy including riverine habitation. The high degree of lateral movement indicates the importance of habitat connectivity for the small-bodied fish community. Wetlands adjacent to the Murray River are becoming increasingly regulated by small weirs and ensuring lateral fish movement will be important in maintaining riverine-wetland biodiversity.

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Section: River Height and Lateral Fish Movementmentioning

confidence: 95%

The effect of water level on lateral movements of fish between river and off-channel habitats and implications for management

Lyon

Stuart

Ramsey

et al. 2010

Mar. Freshwater Res.

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“…The advantage of this method is that it can be used to effectively analyze complex data sets despite non-linear relationships and non-normal distributions, and it results in a two-dimensional map that is easy to interpret (Kohonen 1982). The SOM has proved to be an effective and powerful tool for exploring patterns in species distributions, and the structure of communities (Chon et al 1996;Giraudel and Lek 2001;Penczak et al 2005Penczak et al , 2009Kruk 2006;Lasne et al 2007;Kalteh et al 2008;Bedoya et al 2009). The SOM was simulated and cluster analysis was performed in Matlab (ver.…”

Section: Statistical Data Analysismentioning

confidence: 99%

“…To avoid drawing invalid conclusions, only species having IndVal >25 were taken into consideration. IndVals complement the information presented on graphs of species importance (component planes) produced by the SOM (Lasne et al 2007;Penczak et al 2009). …”

Section: Statistical Data Analysismentioning

confidence: 99%

Applications of self‐organizing map for patterning macrofungal diversity of xerothermic swards

Adamczyk

2011

Ecological Research

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Macrofungal communities were investigated in four associations of xerothermic swards: Festucetum pallentis, Origano-Brachypodietum, Adonido-Brachypodietum pinnati and Diantho-Armerietum elongatae in a Jurassic area of the Częstochowa Upland (southern Poland). A total of 47 species were recorded. The selforganising map (SOM)-an unsupervised algorithm for artificial neural networks-was used to recognise patterns in the macrofungal communities of diverse xerothermic swards. Only two associations were mycologically similar: Origano-Brachypodietum and Adonido-Brachypodietum pinnati. Species with high and significant IndVal (the species indicator value) for each investigated phytocoenoses are presented. The presence of macrofungal species and the participation of indicator species were connected with habitat factors of plant associations, as documented by the IndVal application. In the least fertile phytocoenoses, macrofungal communities were poor with few indicator species. The more fertile phytocoenoses had richer and more varied communities of macrofungi with higher numbers of indicator species. The ordering methods applied in this study were very effective for analyzing the macrofungal communities existing in plant associations.

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“…Faced with the widespread problem related to the difficulty of obtaining reliable and usable data sets, recent advances in conservation biology have suggested that presence-absence data are particularly suitable for the assessment of species distribution in a conservation context (MacKenzie, 2005;Vojta, 2005). Despite the simplicity of such input data, they can provide reliable information for analyzing species distribution, especially in a conservation context (Joseph et al, 2006), and above all the distributions of fish assemblages (Ibarra et al, 2005;Lasne et al, 2007aLasne et al, , 2007b, certain fish species (Oberdorff et al, 2001;Pont et al, 2005), migratory fishes (Eikaas and MacIntosh, 2006) and eel (Broad et al, 2001;. In fish, electrofishing methods are among the most common ways of sampling fish.…”

Section: > Assessing Distribution Patterns With Logistic Modelsmentioning

confidence: 99%

Assessing the freshwater distribution of yellow eel

Lasne

Laffaille

2008

Knowl. Managt. Aquatic Ecosyst.

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In the global context of the decline in wild species, modeling the distribution of populations is a crucial aspect of ecological management. This can be a major challenge, especially for species, such as the European eel, that have complex life cycles, exhibit cryptic behavior, or migrate over long distances. A review of the literature suggests that eel size data could be used to assess and analyze freshwater distribution of eel. We argue that analyses based on small yellow eels (≤ 300 mm) along the longitudinal course of rivers could provide a valuable tool for population monitoring. We propose a standardized catchment recruitment index and a colonization index based on the probability of occurrence (presence/absence data) using logistic models for different size classes. The model developed here provides a convenient guide for assessing yellow eel stages in freshwater areas, and should have concrete applications for management of the species. RÉSUMÉ Évaluation de la distribution des anguilles jaunes en eau douceDans le contexte actuel de déclin des espèces, la modélisation de la distribution des populations est une étape importante pour la gestion de la biodiversité. Cependant, cette modélisation peut s'avérer difficile, particulièrement pour les espèces qui, comme l'anguille européenne, possèdent des cycles de vie complexes, ont un mode de vie cryptique ou effectuent de grandes migrations. Un examen de la littérature suggère que la taille des anguilles peut être utilisée comme critère pour évaluer et analyser la distribution des anguille en eau douce. Nous suggérons que l'examen des patrons de distribution des petites anguilles (≤ 300 mm) le long des réseaux hydrographiques peut fournir des informations précieuses pour le suivi des populations. Nous proposons un indice standardisé de recrutement et de colonisation des bassins versants sur la

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Patterns in fish assemblages in the Loire floodplain: The role of hydrological connectivity and implications for conservation

Cited by 96 publications

References 36 publications

The effect of water level on lateral movements of fish between river and off-channel habitats and implications for management

The effect of water level on lateral movements of fish between river and off-channel habitats and implications for management

Applications of self‐organizing map for patterning macrofungal diversity of xerothermic swards

Assessing the freshwater distribution of yellow eel

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