Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Ecological health of coral reefs in Zanzibar
Bravo, H.; Cannicci, S.; Huyghe, F.; Leermakers, M.; Sheikh, M.A.; Kochzius, M. (2021). Ecological health of coral reefs in Zanzibar. Regional Studies in Marine Science 48: 9102014. https://dx.doi.org/10.1016/j.rsma.2021.102014
In: Regional Studies in Marine Science. Elsevier: Amsterdam. ISSN 2352-4855
|   |
| Trefwoord |
|
| Author keywords |
Bioindicator; Biomonitoring; Coral reefs; Indian Ocean; Tanzania; Trace metals |
| Auteurs | | Top |
- Bravo, H.
- Cannicci, S.
- Huyghe, F.
|
- Leermakers, M.
- Sheikh, M.A.
- Kochzius, M.
|
|
| Abstract |
Coral reefs are important ecosystems in terms of their biodiversity and ecosystem functions. Particularly at local scales, coral reefs are vulnerable to natural and anthropogenic disturbances, leading to the degradation of reef health. Here, we employed two different methods to monitor reef health. First, we conducted line transect surveys to record the benthic community structure to infer ecological reef health. Secondly, trace metal concentrations in sediment samples and a bioindicator sponge species, Haliclona fascigera, were compared among sites to detect cryptic degradation and unknown sources of pollution. The study area comprised six reefs situated along the coast of Zanzibar’s main agglomeration, Stone Town, and subject to different types of disturbances and conservation management schemes. Overall, coral reef health was found to decrease with increasing proximity to Stone Town, with living hard coral cover being particularly low on reefs closest to Stone Town, which coincided with greater fishing, tourism, and pollution pressures. Reef assessments based on trace metal analyses differed from the community structure surveys. All sites showed high levels of arsenic and cadmium contamination, with some samples revealing concerning levels of chromium, copper and zinc. The reefs differed significantly between each other in terms of trace metal concentration for both sediments (p = 0.031, PERMANOVA) and sponge samples (p = 0.001, PERMANOVA). Trace metal concentrations were not correlated with distance to Stone Town, highlighting the downstream effects of industrial and urban sewage on even remote reefs. Coral reef health assessment was found to be dependent on the survey method employed, which is why we recommend the combination of complementary methods. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
