2008. Scientific Review for the Identification of Critical Habitat
... Woodland Caribou (Rangifer tarandus caribou), Boreal Population (herein referred to as
boreal caribou), are formally listed as Threatened under the federal Species at Risk Act
(SARA). The Act requires the Minister of Environment to prepare a Recovery Strategy for the
species that includes, to the ex ...
The Kiwi - Nga Manu Nature Reserve
... of a huge continent called
Gondwanaland along with
South America, Africa,
Australia, India, and
• Gondwanaland broke apart about 80 million years ago.
As a result, species were no longer able to travel around
the whole continent but were trapped on their newly
formed continent. There are ...
Dakota skipper - The Xerces Society
... biological vulnerability and threats to support a proposal to list as endangered or threatened but for which
preparation and publication of a proposal is precluded by higher-priority listing actions” (67 Fed. Reg.
40658). See also, 50 CFR § 424.02(b). In 2002, the USFWS also assigned the Dakota skip ...
Conservation Strategy Updated 3-16-17
... native to the northeastern United States from the Hudson River Valley of New York eastward. The NEC is
currently threatened by the loss of its habitat through development and forest succession. It may also
be imperiled by encroachment into its range by the introduced eastern cottontail (Sylvilagus f ...
6.4 Environmental Niche Analysis - Predicting potential occurrence
... occurrence points across the study area, given the constraints that the expected value of
each environmental variable under this estimated distribution matches its empirical average
(Phillips et al. 2004, 2006). The raw output is a probability value (0-1) assigned to each map
cell of the study area, ...
Schaus Swallowtail Butterfly
... in May and June, where adults are active; most sightings have been recorded
between mid-April and mid-July (FWS 1982). Post flight season emergences
in August or September are extremely rare, but do occur in both the wild and
captively propagated populations (T. Emmel, University of Florida, persona ...
Western Ringtail Possum (Pseudocheirus occidentalis)
... urban development and loss of prime habitat. This coastal strip is considered to be a
stronghold for WRP and is therefore a focus for recovery and conservation of the
species (Jones et al., 2004a; Jones et al., 2007; Harewood, 2008). High WRP
population densities have been recorded in some urban set ...
Cumbria Species and Habitats Statements
... to be scarce within the Lake District.
The majority of breeding sites are below 200m but
they can breed up to 300m. In the early 1980s the
Cumbria population of was estimated to be 120 pairs
(5000 nationally), a decline of 84% in the county since
the 1930s). This has since recovered to 300-350
COSEWIC assessment and status report on the Marbled Murrelet
... oceans warm, increased competition with southern stocks of mackerel and large
Humboldt squid could also be a threat as these piscivores could reduce prey stocks for
murrelets. Other present or future threats include: oil spills and chemical contaminants
at sea; entanglement in gill-nets; displacemen ...
... mediated by pheromones produced by the family group (Batzli et al.
1977). Batzli et al. (1977) found that California vole littermates
suppress growth and sexual maturation when kept in the same cage
while isolated individuals were not suppressed.
With a long breeding season, postpartum estrus, large ...
Distribution and Habitat Associations of Spotted Ratfish (Hydrolagus
... utilized a towed camera sled to conduct surveys of juvenile flatfish habitats at Kodiak
Island, Alaska. Models incorporating fine scale habitat variables (i.e. tube worm
densities, structural complexity created by macroalgae and epifauna) observed in
videos proved more accurate in predicting juvenil ...
Quantifying Terrestrial Habitat Loss and Fragmentation: A Protocol
... subdivision, geometry, isolation, and connectivity, and their affects on individual behavior and
habitat use, population structure and viability, and interspecific interactions. Finally, we view the
evidence, both theoretical and empirical, regarding the issue of when is habitat fragmentation
Reptile Habitat Management Handbook
... The copyright of the photographs generously donated for this publication remains with the photographers.
Note that no criticism is intended of any site managers or organisations whose sites feature in photographs
characterised here as poor habitat for reptiles. The images have been chosen simply to ...
distribution and ecology of the broad
... Kosciuszko National Park with between 69–81% of adults surviving the over-winter period. The
species falls within the Critical Weight Range (Burbidge and McKenzie 1989) and are therefore at
high risk to decline and extinction through predation by introduced predators such as foxes and cats.
The spec ...
Evolutionary Conservation Biology
... As anthropogenic environmental changes spread and intensify across the planet, conservation
biologists have to analyze dynamics at large spatial and temporal scales. Ecological and evolutionary processes are then closely intertwined. In particular, evolutionary responses to anthropogenic environment ...
Existing and proposed PAS recovery and threat abatement
... Heat stress through drought and heatwaves
Support carer and vet networks in their response to the management of koala health
and welfare during extreme weather conditions.
Research and trial adaptation management actions such as installation of artificial
water sources and the establishment of refug ...
Effects of productivity, disturbance, and ecosystem size on food
... full module to start with). A key assumption of our
model is thus that local extinction of the basal resource
causes simultaneous local extinction of the IG-prey and/
or the IG-predator, because the IG-prey and the IGpredator cannot persist in patches without the basal
resource. A patch in state B c ...
Large bodied fish communities and drivers of use in the shallow
... were significantly different from each other with the intertidal community sharing some
species-specific characteristics with both the littoral and subtidal. Teleosts were the dominant
group in the littoral and intertidal habitats while sharks dominated the subtidal habitat. Very
few habitat general ...
report to great lakes council public inquiry into the ecological
... The area of significance to Koalas is generally the same (but larger) than the area of significance to
threatened species (Figures A and B). There is an additional area of importance to Koalas in the vicinity
of lots 106 to 108 and the Commission notes that retention of such area would comply with ...
Habitat use and movement patterns of the Northern
... 2005 and 2006........................................................................................................... 18
Table 2. Patterns of movement were either directed towards a fixed bearing or not
directed (random). A Rao’s spacing test was not applied to data from individuals
that made few ...
Thresholds in Habitat Supply: A Review of the Literature
... change in the rate of response to ecosystem change; a critical value of an ecosystem property at which previously linear
or unobserved change becomes a drastic transformation. Around thresholds, change occurs suddenly. Paradoxically, the
changed state may be long-lived or irreversible. Threshold cha ...
UNIVERSIDAD AUT ´ONOMA DE MADRID FACULTAD DE
... on insensibly changing physical conditions, but in large part on the presence of
other species, on which it depends, or by which it is destroyed, or which it comes
The effects of landscape fragmentation on
... configuration on species distributions or demography is rare
(Betts et al., 2006). This is in striking contrast to the nearly
unequivocal support for the negative influences of landscape
In ecology, extinction debt is the future extinction of species due to events in the past. Extinction debt occurs because of time delays between impacts on a species, such as destruction of habitat, and the species' ultimate disappearance. For instance, long-lived trees may survive for many years even after reproduction of new trees has become impossible, and thus they may be committed to extinction. Technically, extinction debt generally refers to the number of species in an area likely to go extinct, rather than the prospects of any one species, but colloquially it refers to any occurrence of delayed extinction.In discussions of threats to biodiversity, extinction debt is analogous to the ""climate commitment"" in climate change, which states that inertia will cause the earth to continue to warm for centuries even if no more greenhouse gasses are emitted. Similarly, the current extinction may continue long after human impacts on species halt.Extinction debt may be local or global, but most examples are local as these are easier to observe and model. It is most likely to be found in long-lived species and species with very specific habitat requirements (specialists). Extinction debt has important implications for conservation, as it implies that species may go extinct due to past habitat destruction, even if continued impacts cease, and that current reserves may not be sufficient to maintain the species that occupy them. Interventions such as habitat restoration may reverse extinction debt.Immigration credit is the corollary to extinction debt. It refers to the number of species likely to immigrate to an area after an event such as the restoration of an ecosystem.