-
Invasive
alien
species
Entity
: are those that occur outside their natural range and threaten the
existence of native plants and animals.
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Alien
species
Entity
were a factor in the decline of 30% of imperiled
birds and 11% of amphibians (see Chapter 7).
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Specific activities included educational clean-up campaigns to remove litter from the wetland, a participatory assessment
of the wetland,
alien
plant
Entity
eradication, engaging with interested parties and stakeholders, community workshops to create awareness on the importance
of wetlands,
and the development of educational resources.
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Alien
invasive
species
Entity
compete
with native species and change the species composition of the ecosystem (Chapter 9: Alien
Invasive Species), while suppression of fire alters ecosystem function (Chapter
3: Natural Processes and Disturbance).
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For example, ecological integrity monitoring
programs in national parks generally include
biodiversity (e.g. native and invasive
alien
species
Entity
, population parameters of focal
species, and trophic structure), ecosystem
process/function (e.g. succession/retrogression,
representation of park ecosystems,
phenological observations, local and
landscape level productivity, and decomposition
rates), and stressor (e.g. greater
regional ecosystem stressors, and in-park
ecological footprints and human effects)
elements (Table AII.1; Parks Canada 2005).
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Alien
predators
Entity
tend to be more dangerous than native predators to prey populations (Salo et al. 2007).
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These
include
alien
invasive
species
Entity
,
hydrologic regimes, the timing of restoration, and translocations.
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Assuming that control measures taken
against
alien
populations
Entity
will be sufficient
to allow for the recovery of a desired
biological community.
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Ecologists have long recognized that island
ecosystems are more vulnerable to
alien
species
Entity
than most continental ecosystems.
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For example, the most important anthropogenic drivers of threat for biodiversity today are habitat destruction,
introduction of
alien
species
Entity
, overexploitation, disease, and climate change (Mace et al., 2005);
the significance of different threats, however, varies both within and between taxonomic groups (Figure 4).
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-
Invasion by
alien
species
Entity
, second only to habitat loss as a threat to biodiversity, severely
disrupts freshwater and marine ecosystems, tropical forests, urban areas, islands,
grasslands and deserts.
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Recommended Not Recommended
Avoiding the introduction of invasive
species and varieties in restoration.
Assuming an
alien
species
Entity
will not
become invasive.
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Since these activities must be repeated whenever
the population of the
alien
species
Entity
rebounds, there
is little prospect of declaring victory and “walking
away.”
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Before any
alien
invasive
species
Entity
are removed, the impact of their removal
should be evaluated and a strategy developed to minimize potential negative
impacts.
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Allowing the area to recover naturally
where degradation is recent, relatively
small, and in an area not likely to be
invaded by
alien
species
Entity
.
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