Choosing the appropriate spatial resolution for monitoring coral bleaching events using remote sensing

Bleached corals provide a strong optical signal that suggest that remote sensing investigations of major bleaching events are feasible using airborne or satellite sensors. However, patchy coral cover, varying intensities of bleaching, and water depths are likely to limit the application of remoter sensing techniques in monitoring and mapping coral bleaching. Today, satellite multi-spectral sensors routinely provide images of reefs from 4 m (Ikonos) to 30 m resolution (Landsat); however, the adequacy of these sensors for monitoring and mapping bleaching events remains unclear.

The use of geographic information systems for brackishwater aquaculture site selection

This paper identifies and assesses potential brackishwater aquaculture areas on a regional/provincial perspective using geographic information systems (GIS) and multicriteria technique on three sites in the Philippines - Lingayen Gulf area, San Miguel Bay in Bicol region and Negros Occidental. Criteria used cover biogeophysical factors, i.e. soil texture, elevation, land use, physiography and socioeconomic components like settlements, ongoing economic activities other than aquaculture. Some limitations of the study with respect to the use of GIS and the study sites are discussed.

Assessment of forest fragmentation and species diversity in North Andaman Islands (India): a geospatial approach

The present study was carried out in the context of conservation biology research, focusing on the species diversity in the fragmented landscapes of island ecosystem. The study analyzed the levels of forest fragmentation and its effect on species diversity in the North Andaman Islands using satellite remote sensing data and a GIS-based fragmentation model in conjunction with phyto-sociological analysis. Results depict that the model performed well when the forest is considered as a single unit, compared to the scenario wherein the individual forest types are accounted.

Coral reef fishing and coral-algal phase shifts: implications for global reef status

Coral reef fisheries support tens of millions of people, mostly in developing countries. Fishing on reefs can be classified into three stages: manageable, ecosystem-overfished, and Malthusian-overfished. Fishing with blasting devices and poisons is often associated with the third stage. Reductions in herbivory caused by overfishing may enhance the likelihood of organic pollution causing a coral–algal phase shift following major disturbances. However, cage studies indicate that reduction in herbivory can lead to the proliferation of algae even in the absence of eutrophication.

MAPPER, a low-level geographic information system

A Low-Level Geographic Information System (LL-GIS) was developed to provide a simple low-cost mapping program which can be executed in any personal computer, by individuals with different levels of knowledge in computing. MAPPER is an add-on module of FishBase - a global database with key information on the biology of fish - where it creates on-screen maps with information on biodiversity and the occurrence of species. In another application, MAPPER is used to display and analyzed geographical information on the Philippines.

GIS mapping of pond aquaculture potential in southern Malawi, Africa

Smallholding aquaculture in Malawi is gaining popularity, particularly with the promotion of pond-fish culture within integrated agriculture-aquaculture (IAA) systems. These systems benefit poor farm households through enhancing food security and supplementing farm income. Location-specific successes of IAA need to be out-scaled to benefit more farm households. However conditions favoring adoption do not occur uniformly over geographical space.

GIS mapping of pond aquaculture potential in Henan province, China

Freshwater aquaculture development in Henan province is uneven, with more intensive systems occurring in the Huanghe basin while the southern part is relatively underdeveloped and is the target for improving productivity growth of the aquaculture sector. With the high potential areas already developed, increasing aquaculture productivity in the more challenging areas needs to be more strategic and well-supported with relevant information about the opportunities and limitations faced in these areas.

GIS mapping of pond aquaculture potential in southern Cameroon, Africa

Currently there is an unmet demand for freshwater aquaculture production in Cameroon to satisfy domestic fish needs and enhance food security. The aquaculture sub-sector remains under-developed despite its reported potential and past efforts to stimulate its growth. Location-specific successes of smallholding pond aquaculture need to be out-scaled to benefit more farm households. However conditions favoring adoption do not occur uniformly over geographical space.

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