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ScholarsArchive at Oregon State University
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Small, low-head diversion dams are capable of withdrawing much of the flow of a river, often resulting in elevated water temperatures. Accelerated growth and development of aquatic invertebrates has been demonstrated in warmer temperatures,...
2012-03 (iso8601)
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Nassau grouper Epinephelus striatus are a large bodied, top level predator that is ecologically important throughout
the Caribbean. Although typically solitary, Nassau grouper form large annual spawning aggregations at predictable times in...
2012 (iso8601)
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Morphologically divergent ecotypes arise in fish populations on postglacial time scales, and resource polymorphisms
are often invoked to explain their origin. However, genetic recombination can constrain the ability of divergent selection to...
2012 (iso8601)
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In the Klamath province of southwestern Oregon, Northern Spotted Owls (Strix occidentalis caurina) occur in complex, productive forests that historically supported frequent fires of variable severity. However, little is known about the...
2013-03 (iso8601)
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Double-crested Cormorants (Phalacrocorax auritus) have used central New York waters for breeding and
stopover habitats during migration since 1984. In response to public concern over Oneida Lake, the United States
Department of Agriculture...
2012-12 (iso8601)
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When habitat becomes fragmented, populations of species may become increasingly isolated. In the absence of habitat corridors, genetic structure may develop and populations risk reductions in genetic diversity from increased genetic drift and...
2012-12-29 (iso8601)
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Wild-caught juvenile Steller sea lions Eumetopias jubatus (n = 21) were maintained in temporary captivity for up to 12 wk to investigate health, disease, nutrition and behavior. We assessed the effects of captivity on post-release dive behavior...
2008-01 (iso8601)
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In a 1966 American Naturalist article, G. C. Williams
initiated the study of reproductive effort (RE) with the prediction
that longer-lived organisms ought to expend less in reproduction per
unit of time. We can multiply RE, often measured in...
2007-12 (iso8601)
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Recent comparative studies across sex-changing animals
have found that the relative size and age at sex change are strikingly
invariant. In particular, 91%–97% of the variation in size at sex
change across species can be explained by the simple...
2005-05 (iso8601)
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Characterizing the behaviors of sea turtles and identifying high-use areas as they
vary in time and space is important for conservation planning, particularly when turtles overlap
with fisheries that may unintentionally harm them. Between July...
2013-04-08 (iso8601)
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I conducted a study to identify potential spawning habitat for anadromous salmonids above a 60-year-old hydropower dam in the headwaters of the North Umpqua River in Oregon. Like many other historical salmonid-bearing rivers, little documentation...
2013-05-03 (iso8601)
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Coastal wetlands can have exceptionally large carbon (C) stocks and their protection and restoration would constitute an effective mitigation strategy to climate change. Inclusion of coastal ecosystems in mitigation strategies requires...
2013-02-14 (iso8601)
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Background: Pinnipeds, including many endangered and declining species, are inaccessible and
difficult to monitor for extended periods using externally attached telemetry devices that are shed
during the annual molt. Archival satellite...
2008-12-10 (iso8601)
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We evaluated the relative importance of "bottom-up" (production-limited) and "top-down" (predator-mediated) processes during early marine residence in a population of Chinook salmon (Oncorhynchus tshawytscha) from the upper Columbia River, USA. We...
2013-04 (iso8601)
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development trajectories. Here, we present the Sustainable Amazon Network (Rede Amazonia Sustentavel, RAS): a multidisciplinary research initiative involving more than 30 partner organizations working to assess both social and ecological...
2013-05-28 (iso8601)
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Determining the mechanisms responsible for the success of invasive species is critical for
developing effective management strategies. Artificially draining managed wetlands to maintain natural
ephemeral conditions is a common practice in the...
2013-01-15 (iso8601)
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Dendritic ecological networks (DENs) are a unique form of ecological networks that exhibit a dendritic
network topology (e.g. stream and cave networks or plant architecture). DENs have a dual spatial
representation; as points within the network...
2013-05 (iso8601)
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Transmission dynamics of the actinospore stage of Ceratomyxa shasta to the salmonid host were investigated under field and laboratory conditions. The number of parasites transmitted and the transmission rate were compared between 2 different...
2013-03-18 (iso8601)
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Speckled dace (Rhinichthys osculus) is a small cyprinid that is geographically widespread throughout western North America, and the most frequently occurring sh in Oregon. Because of the genetic and morphological variation in this species across...
2013-05-14 (iso8601)
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Remote autonomous ecological acoustic recorders (EARs) were deployed in deep waters at five locations around the island of Kauai and one in waters off Ni'ihau in the main Hawaiian island chain. The EARs were moored to the bottom at depths between...
2013-05 (iso8601)
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The Antarctic krill (Euphausia superba Dana 1852) is widely distributed throughout the southern ocean, where it provides a key link between primary producers and upper trophic levels and supports a major commercial fishery. Despite its ecological...
2012-05-01 (iso8601)
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One of the biggest challenges when conducting a national-scale assessment of lakes, such as the
2007 US National Lake Assessment (NLA), is finding enough reference lakes to set appropriate
expectations for the assessed sites. In the NLA, a random...
2013-02-12 (iso8601)
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We quantified the patterns in macroinvertebrate assemblages and their
associated environmental gradients from 457 least-disturbed wadeable
stream sites across the 48 contiguous United States sampled as part
of US EPA’s National Wadeable Stream...
2013 (iso8601)
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There will be winners and losers as climate change alters the habitats of polar organisms. For an Adelie penguin (Pygoscelis adeliae) colony on Beaufort Island (Beaufort), part of a cluster of colonies in the southern Ross Sea, we report a recent...
2013-04-03 (iso8601)
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