Why is Marine biodiversity important

Figure 1:Coral Reef (copyright The International Coral Reef Initiative)

The seas provide a unique set of goods and services to society, including moderation of climate, processing of waste and toxicants, provision of vital food, medicines and employment for significant numbers of people. Our coasts provide space to live and directly and indirectly create wealth, including millions of jobs in industries such as fishing, aquaculture and tourism. .

Looking at ecosystems in terms of the goods and services they provide allows us to realise their full value and our dependence on those systems in the broadest sense. Exploitation of the environment for one purpose can alter the environment's ability to provide other goods and services, so this knowledge is also a way of understanding what we stand to gain and lose by exploitation of certain aspects of the environment . The main goods and services provided by marine ecosystems are:

• Resilience and resistance
• Disturbance prevention
• Nutrient cycling
• Greenhouse gas regulation
• Bioremediation of waste
• Biologically mediated habitat
• Food provision
• Ocean resources
• Leisure
• Cultural values
• Non-use value: bequest value and existence value
• Option use value

Other types of biodiversity

Biodiversity encompasses many levels of organisation including genes, species, habitats, communities and ecosystems. Although species diversity is the most commonly used measure of taxonomic diversity (or diversity between types of organisms), other measures of taxonomic diversity exist, the most common of which is phyletic diversity. Phyletic diversity is the variation in the working body plans (phyla) of organisms. An example of a phylum is the Arthropoda, which includes the class Decapoda. Phyletic diversity can be a useful measure of diversity, particularly where diversity is comparably higher at the level of phylum than at the level of species. For example, the marine environment has high phyletic diversity because 32 out of the 33 described animal phyla are represented in the oceans.

It is also possible and very useful to measure diversity as the variation in the functional roles of species (rather than the number of species or gene types), within a community or ecosystem. An example of functional diversity is the number of filter feeders in an ecosystem compared to number of grazers. Functional diversity is thought to be one of the main factors determining the long-term stability of an ecosystem and its ability to recover from major disturbances.