D4 Food webs
All elements of the marine food webs, to the extent that they are known, occur at normal abundance and diversity and levels capable of ensuring the long-term abundance of the species and the retention of their full reproductive capacity.
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© Fotolia, Author: Alvinlauw |
Ecosystems, including food webs (relating to Descriptors 1 and 4). |
Criteria |
D4C1 – Primary:
The diversity (species composition and
their relative abundance) of the trophic
guild is not adversely affected due to
anthropogenic pressures.
Member States shall establish threshold
values through regional or subregional
cooperation. D4C2 – Primary:
The balance of total abundance between
the trophic guilds is not adversely affected
due to anthropogenic pressures.
Member States shall establish threshold
values through regional or subregional
cooperation. D4C3 – Secondary:
The size distribution of individuals across
the trophic guild is not adversely affected
due to anthropogenic pressures.
Member States shall establish threshold
values through regional or subregional
cooperation. D4C4 – Secondary (to be used in support
of criterion D4C2, where necessary):
Productivity of the trophic guild is not
adversely affected due to anthropogenic
pressures.
Member States shall establish threshold
values through regional or subregional
cooperation. |