ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Treffer pro Seite

Treffer 1 - 3 | 3 Treffer

Sortierung

Digitale Medien

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

JOLY, PIERRE ; MORAND, ALAIN

Oxford, UK : Blackwell Publishing Ltd

Freshwater biology 31 (1994), S. 0

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1365-2427

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: 〈list xml:id="l1" style="custom"〉1The purpose of this study was to test predictions of the habitat templet and the patch dynamics concept by analysing the relationship between either the species traits or species richness of amphibians and the spatial–temporal variability of eight habitat types of the Upper Rhône River and its floodplain, France.2The information on species traits of the twelve amphibian species was accumulated primarily from the literature; that on habitat utilization was based on field surveys. The information was ‘fuzzy coded’, analysed by ordination techniques, and finally linked to the spatial–temporal variability of habitat types elaborated elsewhere in this issue.3After elimination of the variance caused by the differences between urodeles and anurans, correspondence analysis of the matrix of species traits demonstrated that the flexibility of the temporal pattern of reproduction was the major source of variation among amphibian species. A less significant source of variation within anurans was related to traits usually linked to the concept of r–K selection (potential number of descendants per reproductive cycle and ratio of egg size to female size).4A correspondence analysis of habitat utilization by amphibian species separated four groups of habitat types, corresponding to different degrees of influence that the active channel had on adjacent waters in the floodplain (i.e. from habitats that are most frequently disturbed by floods, to habitats of braided sections, old oxbow lakes, and the more terrestrialized habitats).5A co-inertia analysis of the relationship between species traits and habitat utilization separated two habitat types (terrestrialized former meanders and oxbow lakes) from the others. Species of terrestrialized habitats had a reproductive display, a low number of descendants per reproductive cycle, and a high ratio of egg size to female size. Species of oxbow lakes were early or synchronous breeders, and laid a single clutch.6Neither the predictions of the habitat templet concept nor those of the patch dynamics concept were validated. Species traits were not significantly correlated to the axes of the spatial–temporal variability templet. The highest species richness was observed in habitat types with the highest temporal variability; in addition, richness did not peak at highest spatial variability.7Deviation from the predictions of the river habitat templet could be explained by: (i) the over-simplification of this model with regard to the evolution of the complex life cycles of the amphibians; and (ii) an underestimation of the importance of phylogenetic constraints and the evolution of community interactions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2427.1994.tb01751.x

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Digitale Medien

Habitat variability and space utilization by the amphibian communities of the French upper-rhone floodplain (1995)

Morand, Alain ; Pierre, Joly

Springer

Hydrobiologia 300-301 (1995), S. 249-257

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1573-5117

Schlagwort(e): amphibian community ; spatial-temporal predictability ; predation ; floodplain ; disturbance of water level ; life history

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract In order to study the relationship between community organization and spatial-temporal variability, species richness and abundance of amphibian species were estimated in 17 sites of the French Upper Rhone floodplain. These sites were chosen because they were representative of the diversity of successional processes, age and connection with the active channel. Ecological variation among these sites was estimated by the analysis of 14 mesological, hydrological, and biotic variables, by means of correspondence analysis. Level of disturbance, eutrophication, water origin, presence of fish and water persistence were the main determinants of site typology. Amphibian species richness was highest in temporary sites experiencing intermediate level of disturbance. Three species (Rana ridibunda, Rana dalmatina, Triturus helveticus) were ubiquitous three species (Hyla arborea, Bufo calamita, Pelodytes punctatus) were characteristic of habitats with intermediate variability and four (Triturus cristatus, Triturus alpestris, Bufo bufo, Bombina variegata) were rare in the floodplain. The most abundant species in the floodplain appeared to be r-selected and most of them showed a temporal flexibility of reproduction. These reproduction traits were assumed to respond to the balance between habitat unpredictability and interspecific constraint by making the adjustment to both availability and suitability of breeding habitats possible.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00024465

Permalink