BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE
The Primeiras and Segundas Archipelago Reserve is a recently established marine protected area, the largest in Africa, located in the waters of Northern Mozambique. This protected area is of significant local economic importance and global ecological relevance, containing the southernmost coral reef...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-04-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1009/2015/isprsarchives-XL-7-W3-1009-2015.pdf |
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| author | L. Teixeira M. Nilsson J. Hedley A. Shapiro |
| author_facet | L. Teixeira M. Nilsson J. Hedley A. Shapiro |
| author_sort | L. Teixeira |
| collection | DOAJ |
| description | The Primeiras and Segundas Archipelago Reserve is a recently established marine protected area, the largest in Africa, located in the
waters of Northern Mozambique. This protected area is of significant local economic importance and global ecological relevance,
containing the southernmost coral reefs in Eastern Africa. However, information related to the marine ecosystem, notably benthic
habitat is very scarce. Twelve atolls were mapped in the region using object-based image classification of very-high resolution
satellite imagery (IKONOS, Quickbird, and WorldView-2). Geographically referenced data on benthic cover and depth were
gathered in the course of three fieldwork expeditions covering a total of four atolls and two shallow reef structures in the Segundas
Archipelago. The resulting map allows the estimation of three distinct types of coral cover (field, patches, spurs and grooves); the
differentiation of sand, rubble and rock substrate; and the detection of seagrass and brown macroalgae, identifying up to 24 benthic
habitats. Average overall accuracy was above 50%. The high variability of the optical properties on the reef systems, in large due to
the connectivity with the mainland via plumes, while interesting from an ecological perspective increases the challenges for remote
sensing of bottom cover. New information indicates the presence of deep benthic cover extending from the atolls, suggesting the
need for further research on Coastal Eastern African corals, namely on their resilience and connectivity, and supporting current
knowledge of the existence of an almost continuous coral reef from Kenya to Mozambique. Coral and fish biodiversity data have
been analysed together with the satellite-derived maps. Results support the local perception that ecosystems are in decline and
uncover new information about biodiversity’s spatial patterns. Our work provides a detailed depiction of marine habitats that may
aid the management of the protected area, namely in the definition of fishing zones and coral cover monitoring. |
| first_indexed | 2024-04-13T03:12:25Z |
| format | Article |
| id | doaj.art-cd8d17473a0f4a6aab602f4d33589e05 |
| institution | Directory Open Access Journal |
| issn | 1682-1750 2194-9034 |
| language | English |
| last_indexed | 2024-04-13T03:12:25Z |
| publishDate | 2015-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| spelling | doaj.art-cd8d17473a0f4a6aab602f4d33589e052022-12-22T03:05:01ZengCopernicus PublicationsThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences1682-17502194-90342015-04-01XL-7/W31009101610.5194/isprsarchives-XL-7-W3-1009-2015BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVEL. Teixeira0M. Nilsson1J. Hedley2A. Shapiro3Lund University, Department of Physical Geography and Ecosystems Science, Sölvegatan 12, 223 62, Lund, SwedenLund University, Department of Physical Geography and Ecosystems Science, Sölvegatan 12, 223 62, Lund, SwedenArgans Ltd., UKWorld Wide Fund for Nature (WWF) Germany, BerlinThe Primeiras and Segundas Archipelago Reserve is a recently established marine protected area, the largest in Africa, located in the waters of Northern Mozambique. This protected area is of significant local economic importance and global ecological relevance, containing the southernmost coral reefs in Eastern Africa. However, information related to the marine ecosystem, notably benthic habitat is very scarce. Twelve atolls were mapped in the region using object-based image classification of very-high resolution satellite imagery (IKONOS, Quickbird, and WorldView-2). Geographically referenced data on benthic cover and depth were gathered in the course of three fieldwork expeditions covering a total of four atolls and two shallow reef structures in the Segundas Archipelago. The resulting map allows the estimation of three distinct types of coral cover (field, patches, spurs and grooves); the differentiation of sand, rubble and rock substrate; and the detection of seagrass and brown macroalgae, identifying up to 24 benthic habitats. Average overall accuracy was above 50%. The high variability of the optical properties on the reef systems, in large due to the connectivity with the mainland via plumes, while interesting from an ecological perspective increases the challenges for remote sensing of bottom cover. New information indicates the presence of deep benthic cover extending from the atolls, suggesting the need for further research on Coastal Eastern African corals, namely on their resilience and connectivity, and supporting current knowledge of the existence of an almost continuous coral reef from Kenya to Mozambique. Coral and fish biodiversity data have been analysed together with the satellite-derived maps. Results support the local perception that ecosystems are in decline and uncover new information about biodiversity’s spatial patterns. Our work provides a detailed depiction of marine habitats that may aid the management of the protected area, namely in the definition of fishing zones and coral cover monitoring.http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1009/2015/isprsarchives-XL-7-W3-1009-2015.pdf |
| spellingShingle | L. Teixeira M. Nilsson J. Hedley A. Shapiro BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| title | BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE |
| title_full | BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE |
| title_fullStr | BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE |
| title_full_unstemmed | BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE |
| title_short | BENTHIC HABITAT MAPPING AND BIODIVERSITY ANALYSIS IN THE PRIMEIRAS AND SEGUNDAS ARCHIPELAGO RESERVE |
| title_sort | benthic habitat mapping and biodiversity analysis in the primeiras and segundas archipelago reserve |
| url | http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1009/2015/isprsarchives-XL-7-W3-1009-2015.pdf |
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