Resistance, resilience, and recovery
from drought
The popular view of droughts in Australia, and one
which has scientific support, is that they are a
perturbation to which aquatic biota are well adapted
(e.g. Humphries & Baldwin, 2003). Yet such expectations do not logically lead to the conclusion that
drought stricken ecosystems will rapidly recover.
Droughts put aquatic biota under increasing stress as
they represent progressive loss of aquatic habitat,
depletion of food resources and decline of water
quality, with an increased likelihood of biotic interactions as flow reduces. As a perturbation,
droughts occur over large (landscape) spatial scales,
so they potentially threaten the survival, not only of
individual aquatic organisms, but also of regional
populations, or even species themselves. Indeed, the
present-day natural distributions of many native
aquatic species have been strongly influenced by past
natural climatic fluctuations including changing frequency, severity and duration of droughts (Matthews,
1998; Douglas et al., 2003).
Resistance, resilience, and recoveryfrom droughtThe popular view of droughts in Australia, and onewhich has scientific support, is that they are aperturbation to which aquatic biota are well adapted(e.g. Humphries & Baldwin, 2003). Yet such expectations do not logically lead to the conclusion thatdrought stricken ecosystems will rapidly recover.Droughts put aquatic biota under increasing stress asthey represent progressive loss of aquatic habitat,depletion of food resources and decline of waterquality, with an increased likelihood of biotic interactions as flow reduces. As a perturbation,droughts occur over large (landscape) spatial scales,so they potentially threaten the survival, not only ofindividual aquatic organisms, but also of regionalpopulations, or even species themselves. Indeed, thepresent-day natural distributions of many nativeaquatic species have been strongly influenced by pastnatural climatic fluctuations including changing frequency, severity and duration of droughts (Matthews,1998; Douglas et al., 2003).
การแปล กรุณารอสักครู่..
