| Titre : |
Seagrasses and algae of north-eastern Madagascar |
| Type de document : |
texte imprimé |
| Auteurs : |
Monica Tombolahy, Auteur ; Giuseppe Di Carlo, Auteur |
| Editeur : |
Conservation International |
| Année de publication : |
2011 |
| Importance : |
p 44-52 |
| Langues : |
Anglais (eng) |
| Catégories : |
SCIENCES DE LA MER
|
| Mots-clés : |
NORD EST DE MADAGASCAR ALGUES DE LA MER TAXONOMIE |
| Résumé : |
The north-eastern coast of Madagascar presents extensive and highly diverse algal and seagrass assemblages. As this part of the coastline is almost completely undeveloped, these habitats are in a pristine state, only limited by environmental conditions, such as wave action, sediment runoff and nutrient concentrations. Ten species of seagrass were common, comparable to the species diversity found elsewhere in the Western Indian Ocean : Thalassodendron ciliatum, Thalassia hemprichii, Syringodium isoetifolium, Cymodocea rotundata C .serrulata, Halodule uninervis, H.wrightii, Halophila ovalis, H.stipulacea and Zostera capensis. Larger species were mainly found on stable substrates, mostly in coastal lagoons or on the shallow, inner edge of coral reef flats. In are where sendiment conditions were particularly dynamic and hydrodynamic forces play a major role, smaller, fast growing species were dominant, with considerable spatial and temporal variation. In the few urban areas present along this coastline, seagrass distribution was limited by pollution and eutrophication resulting from sewage outfalls and farming activities.
To capture the diversity and abundance of algae and seagrass beds in the study area, four habitat categories are described here : coastal, including both exposed areas and lagoons ; reef flats ; riverine systems and deep/open water. The list of species, frequency of occurrence and shoot density are reported for each habitat, including key ecological processes such as sediment type, physical disturbance, light limitation and human-induced threats. The understanding of differences in the habitats, their key ecological functions and potential threats described here provide recommendations for managing algal beds and seagrass meadows and their ecosystem services. |
| Numéro du document : |
A 10359/MAR 22 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
GESTION DE L'ENVIRONNEMENT MARIN |
| Bull2 (Theme secondaire) : |
GESTION DES RESSOURCES MARINES |
Seagrasses and algae of north-eastern Madagascar [texte imprimé] / Monica Tombolahy, Auteur ; Giuseppe Di Carlo, Auteur . - Conservation International, 2011 . - p 44-52. Langues : Anglais ( eng)
| Catégories : |
SCIENCES DE LA MER
|
| Mots-clés : |
NORD EST DE MADAGASCAR ALGUES DE LA MER TAXONOMIE |
| Résumé : |
The north-eastern coast of Madagascar presents extensive and highly diverse algal and seagrass assemblages. As this part of the coastline is almost completely undeveloped, these habitats are in a pristine state, only limited by environmental conditions, such as wave action, sediment runoff and nutrient concentrations. Ten species of seagrass were common, comparable to the species diversity found elsewhere in the Western Indian Ocean : Thalassodendron ciliatum, Thalassia hemprichii, Syringodium isoetifolium, Cymodocea rotundata C .serrulata, Halodule uninervis, H.wrightii, Halophila ovalis, H.stipulacea and Zostera capensis. Larger species were mainly found on stable substrates, mostly in coastal lagoons or on the shallow, inner edge of coral reef flats. In are where sendiment conditions were particularly dynamic and hydrodynamic forces play a major role, smaller, fast growing species were dominant, with considerable spatial and temporal variation. In the few urban areas present along this coastline, seagrass distribution was limited by pollution and eutrophication resulting from sewage outfalls and farming activities.
To capture the diversity and abundance of algae and seagrass beds in the study area, four habitat categories are described here : coastal, including both exposed areas and lagoons ; reef flats ; riverine systems and deep/open water. The list of species, frequency of occurrence and shoot density are reported for each habitat, including key ecological processes such as sediment type, physical disturbance, light limitation and human-induced threats. The understanding of differences in the habitats, their key ecological functions and potential threats described here provide recommendations for managing algal beds and seagrass meadows and their ecosystem services. |
| Numéro du document : |
A 10359/MAR 22 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
GESTION DE L'ENVIRONNEMENT MARIN |
| Bull2 (Theme secondaire) : |
GESTION DES RESSOURCES MARINES |
|
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