Glossary of terms
263
technique of systematic conservation planning is to
create a range of hypothetical alternative networks
that enable planners to engage with the complexity
of multi - sectoral spatial planning. Systematic conservation planning is concerned with the optimal
application of spatially - explicit conservation management actions to promote the persistence of biodiversity and other natural features in situ .
Trophic cascade: The chain of knock - on extinctions observed or predicted to occur following the
loss of one or a few species that play a critical role
(e.g. as a pollinator) in ecosystem functioning.
Wallacean extinction: Species that have not been
documented for many years, but in which fi nal
extinction is uncertain because populations might
survive in areas that have not been surveyed within
the potential distributional range.
Wallacean shortfall: The inadequacy of scientifi c
knowledge of the geographical distributions of
species.
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