Marie-Andrée Fallu; Nancie Allaire; Reinhard Pienitz:

Freshwater Diatoms from northern Québec and Labrador (Canada)

Species-environment relationships in lakes of boreal forest, forest-tundra and tundra regions

2000. VI, 200 pages, 20 plates, 14x22cm, 410 g
Language: English

(Bibliotheca Diatomologica, Band 45)

ISBN 978-3-443-57036-1, paperback, price: 66.00 €

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Abstract top ↑

The freshwater diatom flora from arctic and subarctic regions of North America remains poorly known. The aim of this investigation is to improve our knowledge of diatoms in lakes from eastern subarctic Canada, and to provide a stronger foundation for the use of diatoms in limnological and palaeolimnological studies. To this end, we analysed the modern diatom assemblages in surficial sediments from 123 lakes in northern Québec and Labrador. The two study transects in Jamésie-Hudsonie (data set including 59 lakes and 38 environmental variables) and in Québec-Labrador (data set consisting of 64 lakes and 29 environmental variables) extend over a vast area from the boreal forest in the south to arctic tundra conditions in the north. Of a total of 516 diatom taxa in the Jamésie-Hudsonie data set, 218 species were used for the development of a transfer function for the reconstruction of dissolved organic carbon (DOC). In the Québec.Labrador data set, two inference models were developed for the reconstruction of water colour and alkalinity based on 128 of 303 diatom taxa. The majority of taxa belonging to this surprisingly species-rich boreal-subarctic diatom flora are illustrated in photographic plates, accompanied by a short description of the distribution of each taxon.

Résumé top ↑

Les assemblages récents de diatomées lacustres furent analysés dans 123 lacs du Québec nordique et du Labrador dans le but de créer différents modèles de reconstitution paléolirnnologique. Les lacs sont répartis en deux transects et 38 variables environnementales furent analysés dans le transect de la Jamésie- Hudsonie (59 lacs), alors que 29 variables furent analysées dans les transect du Québec-Labrador (64 lacs). Des 516 espéces identifiées en Jarnésie-Hudsonie, 218 furent utilisées pour crcer un modèle de reconstitution des concentrations en carbone organique dissous (COD). Au Québec-Labrador, plus de 303 espèces furent identifiées et 128 furent utilisées pour élaborer deux modèles de reconstitution (couleur de l'eau et alcalinité). Une grande partie de la flore identifiée est illustrée dans ce livre et est accompagnée d'une brève description de répartition des espéces dans les transects.

Contents top ↑

1. Introduction 1
Overview 1
1.1 The use of diatoms in paleolimnology l
1.2 Studies of freshwater diatoms in northern Quebec and Labrador 2
1.3 Purpose of this project 3
2. Diatoms as indicators of dissolved organic carbon (DOC),
alkalinity, and water colour 5
Overview 5
2.1 Study area 5
2.2 Methods 8
2.2.1 Sampling and measurement procedures ; 8
2.2.2 Numerical analysis 11
2.3 Ordination results 13
2.3.1 PCA 13
2.3.2 CCA 15
2.4 Inference models 22
2.4.1 WA-PLS 22
2.4.2 Potential indicator taxa 24
2.5 Implications for paleoecological studies 24
3. Diatom taxa 33
Overview 33
Diatom flora 35
References 124
Plates 135
Appendix I Raw environmental data for the 59 study sites of Jamesie-
Hudsonie 178
Appendix II Raw environmental data for the 64 study sites of Quebec-
Labrador 182
Appendix III Taxonomic index of the 218 most abundant diatom species
used for CCA plotting (Fig. 2.5) in Jamesie-Hudsonie 184
Appendix IV Taxonomic index of the 128 most abundant diatom species
used for CCA plotting (Fig. 2.6) in Quebec-Labrador 189
Species index 192