Results
876 - 900 of 1229 Items << < 31 32 33 34 35 36 37 38 39 40 > >>
876 - 900 of 1229 Items << < 31 32 33 34 35 36 37 38 39 40 > >>
|
Recent studies of estuarine sediment deposits have focused on grain size spectra as a tool to better
understand depositional processes, in particular those associated with tidal inlet and basin dynamics.
The key to accurate interpretation of...
2013-07-10 (iso8601)
|
|
Substantial scientific investment has been directed towards understanding
factors that influence distribution patterns and animals' remarkable ability for precise
orientation and navigation, yet fundamental gaps in our knowledge remain. In my...
2014-12-02 (iso8601)
|
|
Taxonomy report title; "May 1980."; Author affiliated wiht "Oregon Natural Heritage Program," within the text of the work under "IV. Authorship." p.10; Includes bibliographical references (p. 9-10)
1980-09-21
2009-07-16 2009-12-21 |
|
The ecological interaction between the largest coastal predator, the gray whale (Eschrichtius robustus) and the most abundant shallow water marcrozooplanktonic prey, mysids, were examined in a poorly-understood predator-prey relationship along the...
2009-06-15 (iso8601)
|
|
“This report summarizes project progress in FY 1976 on the first phase of a
survey on the continental shelf and upper continental slope off the coast of Washington. The second and final phase is a replicate survey scheduled for FY 1977....
1976-06 (iso8601)
|
|
Individuals within populations often differ substantially in habitat use, the ecological consequences of which can be far reaching. Stable isotope analysis provides a convenient and often cost effective means of indirectly assessing the habitat...
2016-06-15 (iso8601)
|
|
From July 1985 to April 1987 the pelagic
zooplankton community of Crater Lake, Oregon was studied
to determine taxonomic structure, absolute and relative
densities, and spatial and temporal distributional
patterns. Samples were collected using...
1988-03-14 (iso8601)
|
|
We examined the incidental
catches of American shad (Alosa
sapidissima) taken during research
cruises and in commercial and recreational
landings along the Pacific
coast of North America during over
30 years of sampling. Shad, an introduced...
2011 (iso8601)
|
|
2008-10-03
2008-10-03 1975-09-21 |
|
The amount and distribution of neutral and adaptive genetic diversity are often assumed to follow similar patterns. However, natural selection on adaptive loci may cause divergence from patterns observed for loci which are only influenced by...
2014-09-10 (iso8601)
|
|
Abstract Sediment-phosphorus release rates as a function of pH were determined in laboratory experiments for sediment and water samples collected from Shoalwater Bay in Upper Klamath Lake, Oregon, in 2001. Areal release rates for a stable...
2024-09-21
2005-01-31 2004-12-22 |
|
The critically endangered Maui's dolphin (Cephalorhynchus hectori maui) and the endangered Hector's dolphin (C. h. hectori) are endemic to the coastal waters of New Zealand, where their primary threat is fisheries-related mortality. The Maui's...
2014-04-18 (iso8601)
|
|
From 3 April – 23 September 2009 we monitored the distribution, abundance and productivity of the federally Threatened Western Snowy Plover (Charadrius alexandrinus nivosus) along the Oregon coast. From north to south, we surveyed and monitored...
2009-12-30 (iso8601)
|
|
This dissertation examines the efficacy of using passive acoustic monitoring of dolphin echolocation clicks to study ecological questions about spatial and temporal distribution patterns and the influence of environmental variability on dolphin...
2008 (iso8601)
|
|
Documentary
films and filmstrips produced by Ruth and Louis Kirk for public television and
educational distribution many of them relating to the National Parks; Ruth and Louis Kirk were a husband and wife team of filmmakers who
made...
|
|
The seasonal life history of the cereal stem moth (CSM), Ochsenheimeria
vacculella Fischer von Roslerstamm, (Lepidoptera : Ochsenheimeriidae) was investigated
in a commercial field of annual ryegrass in the Willamette Valley, OR from January
1993...
1994-11-18 (iso8601)
|
|
Comparatively little work has been done to determine the ecology
of Clostridium botulinum type E since its initial isolation in the
nineteen-thirties. This spore forming, anaerobic microorganism is
relatively heat labile and has been missed in...
1966-05-12 (iso8601)
|
|
Document: Appendices to Pacific Southwest Water Plan Review Draft "Bureau of Sport Fisheries and Wildlife", August 1963, page 2
1963-08-01
|
|
purchase of fishing tackle and sporting arms and ammunition; food, fuel, and other supplies; licenses and fees; vehicles and trailers; the hire of services and equipment; and the rental of motels, cabins, and other accommodations.
Understandably,...
|
|
This thesis consists of three manuscripts describing ecophysiological research on
the cyanolichen Lobaria oregana. The first manuscript includes a re-evaluation of
the assumptions underlying past estimates of N fixation by this species and...
2001-10-30 (iso8601)
|
|
The Lewis and Clark journals contain some of the earliest and most detailed written descriptions of a large part of the United States before
Euro-American settlement.We used the journal entries to assess the influence of humans on wildlife...
2003-10 (iso8601)
|
|
Human activities have altered Earth’s ecosystems. Most biomes have experienced a 20-50% conversion to human use. Loss of habitat has obvious effects on the persistence of species. Fragmentation, however, may also negatively affect biodiversity for...
2014-03-19 (iso8601)
|
