The presentation shows using Erdas Imagine software for processing remote sensing data with a case study of Landsa TM images classified to detected land cover types in Aegean region, west Turkey. Two images were processed using Erdas Imageine, classified and changes in landscapes compared. The...

Nutrient enrichment of marine ecosystems is regarded as a pressing global environmental problem. For certain marine species it may be a mixed blessing, resulting in damaging ecosystem events, but contributing to primary productivity. Consequently, the impact of enrichment on fishery profits may...

The study is geographically focused on the Manila Trench, located in the west Pacific Ocean, South China Sea, west Philippines. The research aims at the geological mapping, analysis and visualizing variations in the submarine geomorphology of the Manila Trench. Technically, the work was done...

The conservation of biodiversity is a major environmental issue, one that promises to remain at or near the top of the environmental agenda for the foreseeable future. The loss of biodiversity affects human welfare as well as being lamentable for its own sake. Humans depend on natural systems to...

User rights in fisheries refer to the rights of fishers to harvest from fish resources. In terms of exclusivity, security, duration and transferability these rights can be strong or they can be weak. For this a definition of and a measure of the strength of user rights is needed. We refer to...

Many of the world's replenishable resources are in decline. Optimal harvests with smooth recruitment is well studied but in recent years, ecologists have concluded that tipping points in recruitment are common. Recruitment with a tipping point has low-fecundity below the tipping point and...

This paper examines how to harvest a biomass exposed to a potential collapse at an uncertain date. A specific recovery effect is identified which may be positive or negative. In general, the effect on the optimal biomass is indeterminate and depends upon the failure rate, the expected collapse,...

Two agents possess the fishing rights to a lake. Each period they have two options, to catch without restraint, e.g., to use a fine-mazed net, or to catch with some restraint, e.g., to use a wide-mazed net. The use of a fine-mazed net always yields a higher immediate catch than the alternative....

Canada's Pacific salmon fisheries are again in a crisis of declining stocks, excess fishing effort and poor returns. Changes in fisheries management which may help resolve some of these problems include licence buy-backs, individual transferable quotas, additional effort controls, single gear...