| Titre : |
Coral reef health and status |
| Type de document : |
texte imprimé |
| Auteurs : |
David Obura, Auteur ; Tom Oliver, Auteur |
| Editeur : |
Conservation International Madagascar |
| Année de publication : |
2011 |
| Importance : |
p 56-67 |
| Langues : |
Anglais (eng) |
| Catégories : |
SCIENCES DE LA MER
|
| Mots-clés : |
CORAIL DES ROCHERS MADAGASCAR ETUDE DES CORAUX |
| Résumé : |
To prioritize resilient reefs for conservation action, we evaluated the sites surveyed in the Northeast Madagascar Marine RAP using resilience assessment methods developed by IUCN and CORDIO East Africa. Overall the region showed high coral over (mean of 48%) and coral populations that spanned the expected size range for the genus in question, including large, mature colonies. The common occurrence of large colonies suggests that there has been no catastrophic morality in the past few decades. Coral recruitment was present but relatively low.
Even after an extended heating event that ended preceding the survey, coral bleaching was low, showing a mean -5% of colonies affected. This and the low impact detected from the 1998 mass bleaching event suggests that the corals in this region have largely resisted the negative effects of heating events and supports the hypothesis that those reefs are thermally resistant. In general, the northern three locations (Ambodivahibe, Nosy Ankao, Loky bay), showed greater coral cover, larger corals and fewer bleached colonies than the southern two sites (Andravina and Vohemar). Coral recruitment was highest on the northern and southern extremes in Ambodivahibe and Vohemar, though overall was comparatively low.
The generally intact structure of the reefs and apparent resistance to coral bleaching suggests that the region is a priority for conservation. We recommand conservation actions to enhance coral recruitment, a key factor for ecological resilience, through the targeted restriction of of fishing pressure and watershed management to limit/reduce sedimentation.
|
| 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 |
Coral reef health and status [texte imprimé] / David Obura, Auteur ; Tom Oliver, Auteur . - Conservation International Madagascar, 2011 . - p 56-67. Langues : Anglais ( eng)
| Catégories : |
SCIENCES DE LA MER
|
| Mots-clés : |
CORAIL DES ROCHERS MADAGASCAR ETUDE DES CORAUX |
| Résumé : |
To prioritize resilient reefs for conservation action, we evaluated the sites surveyed in the Northeast Madagascar Marine RAP using resilience assessment methods developed by IUCN and CORDIO East Africa. Overall the region showed high coral over (mean of 48%) and coral populations that spanned the expected size range for the genus in question, including large, mature colonies. The common occurrence of large colonies suggests that there has been no catastrophic morality in the past few decades. Coral recruitment was present but relatively low.
Even after an extended heating event that ended preceding the survey, coral bleaching was low, showing a mean -5% of colonies affected. This and the low impact detected from the 1998 mass bleaching event suggests that the corals in this region have largely resisted the negative effects of heating events and supports the hypothesis that those reefs are thermally resistant. In general, the northern three locations (Ambodivahibe, Nosy Ankao, Loky bay), showed greater coral cover, larger corals and fewer bleached colonies than the southern two sites (Andravina and Vohemar). Coral recruitment was highest on the northern and southern extremes in Ambodivahibe and Vohemar, though overall was comparatively low.
The generally intact structure of the reefs and apparent resistance to coral bleaching suggests that the region is a priority for conservation. We recommand conservation actions to enhance coral recruitment, a key factor for ecological resilience, through the targeted restriction of of fishing pressure and watershed management to limit/reduce sedimentation.
|
| 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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