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Image of the Search Organizations portlet for How to Add an Organization tutorial.
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Seasonal and diel patterns in the migrations of fishes between a river and a floodplain tributary
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The population behaviours associated with the migrations of fishes in lowland river ecosystems are amongst the most poorly-understood dispersal mechanisms of temperate freshwater organisms. This study evaluated the influence of four environmental variables (light levels, river discharge, water temperature and water velocity) on the timing, intensity and direction of fish movements between the River Avon (Hampshire, England) and a small floodplain tributary, Ibsley Brook, over a 12-month period. Using canonical correspondence analysis (CCA) to identify patterns of movement (by groups of species) and the relative strengths of explanatory variables in the data, the probability of fishes migrating between the river and tributary was determined using Bayesian modelling. The intensity and direction of fish movements between the river and tributary varied temporally, both on a diel and seasonal basis, and there were species- and age-specific patterns in behaviour. Diel movements appeared to be triggered by changes in light intensity and brook water velocity, whereas seasonal movements were mostly driven by changes in river discharge and water temperature, particularly those associated with floods. This study emphasises the importance of connectivity in river systems, as fishes migrated in all conditions, but especially during rapidly- rising discharge. ecosystem function; habitat connectivity; habitat fragmentation; habitat use; river discharge; water velocity
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Seasonal Neighbors: Residential Development Encroaches on Mule Deer Winter Range in Central Oregon
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Mule deer populations in central Oregon
are in decline, largely because of habitat
loss. Several factors are likely contributors.
Encroaching juniper and invasive
cheatgrass are replacing deer forage
with high nutritional value, such as bitterbrush
and sagebrush. Fire suppression
and reduced timber harvests mean fewer
acres of early successional forest, which
also offer forage opportunities. Human
development, including homes and roads,
is another factor. It is this one that scientists
with the Pacific Northwest Research
Station and their collaborators investigated
in a recent study.
As part of an interagency assessment of
the ecological effects of resort development
near Bend, Oregon, researchers
examined recent and potential development
rates and patterns and evaluated
their impact on mule deer winter range.
They found that residential development
in central Oregon is upsetting traditional
migratory patterns, reducing available
habitat, and possibly increasing stress
for mule deer. Many herds of mule deer
spend the summer in the Cascade Range
and move to lower elevations during the
winter. An increasing number of buildings,
vehicle traffic, fencing, and other
obstacles that accompany human land
use are making it difficult for mule deer
to access and use their winter habitat.
The study provides valuable information
for civic leaders, land use planners,
and land managers to use in weighing
the ecological impact of various land use
decisions in central Oregon.
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Seasons and Life Cycles
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A conceptual framework. This table is a guide to determining how individual species are responding to an extended growing
season by observing the duration of peak season. The life history of a species—from the onset of greening through the end of
senescence—is illustrated by the length of the solid lines. Each case represents a shift in the timing (columns) and duration
(rows) of one or more species in a hypothetical three-species community that includes an early-, mid-, and late-season species.
The growing season begins when the first species greens and ends when the last species senesces. The peak season (gray shaded
area) occurs when all species have started and none have completed their life history. Reproductive life history events likely
begin before the peak season and are completed before its end. The final row and column list changes that can be observed
through frequent observations of surface greenness.
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SECAS April 2024 Newsletter
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Logo sneak peek, Summit and Caribbean CoP reflections, Southeast CASC collaboration
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Southeast Conservation Adaptation Strategy (SECAS) Newsletter
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SECAS Newsletter October 2023
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SECAS October newsletter: 2023 Southeast Blueprint and SECAS goal report released, introducing the Midwest Blueprint
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Southeast Conservation Adaptation Strategy (SECAS) Newsletter
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SECAS Third Thursday Web Forum May 16th 10:00 am ET
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Web Forum on Thursday: Understanding coastal wetland change from multiple perspectives.
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SECAS Third Thursday Web Forum January 18th 10:00 am ET
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Join us on Thursday for a special webinar co-hosted with the Southeast Climate Adaptation Science Center! This web forum features multiple staff of the Atlanta Botanical Garden and the Southeast Plant Conservation Alliance.
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Sectoral contributions to surface water stress in the coterminous United States
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Here, we assess current stress in the freshwater system based on the best available data in order to understand possible risks and vulnerabilities to regional water resources and the sectors dependent on freshwater. We present watershed-scale measures of surface water supply stress for the coterminous United States (US) using the water supply stress index (WaSSI) model which considers regional trends in both water supply and demand. A snapshot of contemporary annual water demand is compared against different water supply regimes, including current average supplies, current extreme-year supplies, and projected future average surface water flows under a changing climate. In addition, we investigate the contributions of different water demand sectors to current water stress. On average, water supplies are stressed, meaning that demands for water outstrip natural supplies in over 9% of the 2103 watersheds examined. These watersheds rely on reservoir storage, conveyance systems, and groundwater to meet current water demands. Overall, agriculture is the major demand-side driver of water stress in the US, whereas municipal stress is isolated to southern California. Water stress introduced by cooling water demands for power plants is punctuated across the US, indicating that a single power plant has the potential to stress water supplies at the watershed scale. On the supply side, watersheds in the western US are particularly sensitive to low flow events and projected long-term shifts in flow driven by climate change. The WaSSI results imply that not only are water resources in the southwest in particular at risk, but that there are also potential vulnerabilities to specific sectors, even in the ‘water-rich’ southeast.
Keywords: water resources, surface water, water stress
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SECURITY_ CC.pdf
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