Publications
Below is a list of WERC's peer-reviewed publications. If you are searching for a specific publication and cannot find it in this list, please contact werc_web@usgs.gov
Filter Total Items: 3617
Walking of the shore crab Pachygrapsis crassipes in its two natural environments
Video analyses of crabs walking on smooth and rocky terrains when in air and when submerged in water were conducted. Modifications of walking in the two environments, between which the animal’s weight changes sixfold, are consistent with the goals of maximizing ease of walking and minimizing risk of injury. The duty factor (fraction of step cycle in which the dactylus is in contact with the substr
Authors
Clifford A. Hui
Experimental evidence for the effects of polyphenolic compounds from Dictyoneurum californicum (Phaeophyta; Laminariales) on feeding rate and growth in the red abalone Haliotus rufescens Swainson
The effects of polyphenolic compounds from brown algae on grazing and growth rate of the California red abalone Haliotis rufescens Swainson were examined. Abalone consumed three phenolic-poor algal species, Laminaria sinclarii (Harvey) Farlow, Macrocystis pyrifera Agardh, and Nereocystis luetkeana Postels et Ruprecht (mean phenolic content = 0.52% dry mass), at a greater rate than two phenolic-ric
Authors
F.C. Winter, J. A. Estes
Selenium and other elements in freshwater fishes from the irrigated San Joaquin Valley, California
Arsenic (As), chromium (Cr), mercury (Hg), and selenium (Se) were measured in composite whole-body samples of five fishes — bluegill (Lepomis macrochirus), common carp (Cyprinus carpio), mosquitofish (Gambusia affinis), largemouth bass (Micropterus salmoides), and Sacramento blackfish (Orthodon microlepidotus) — from the San Joaquin River system to determine if concentrations were elevated from ex
Authors
M. K. Saiki, M.R. Jennings, T.W. May
Aspects of the ecology of an isolated brook trout (Salvelinus fontinalis) population in Fairfax County, Virginia
No abstract available.
Authors
J.E. Lovich
Commissioned Review. Carbon: freshwater plants
δ13C values for freshwater aquatic plant matter varies from −11 to −50‰ and is not a clear indicator of photosynthetic pathway as in terrestrial plants. Several factors affect δ13C of aquatic plant matter. These include: (1) The δ13C signature of the source carbon has been observed to range from +1‰ for HCO3− derived from limestone to −30‰ for CO2 derived from respiration. (2) Some plants assimila
Authors
J. E. Keeley, D.R. Sandquist
Nesting behavior and movements of western pond turtles, Clemmys marmorata
No abstract available.
Authors
G. B. Rathbun, N. Siepel, D. Holland
Modelling crustacean fisheries: effects of parasites on management strategies
No abstract available.
Authors
A. M. Kuris, K. D. Lafferty
Foraging on prey that are modified by parasites
A model that weighs the energetic cost of parasitism for a predator against the energetic value of prey items that transmit the parasite to the predator suggests that there is often no selective pressure to avoid parasitized prey This offers an explanation for why parasites so frequently exploit predators and prey as definitive and intermediate hosts, respectively Furthermore, predators may actual
Authors
Kevin D. Lafferty
Toxic elements and organochlorines in harbor seals (Phoca vitulina richardsi), Kodiak, Alaska, USA
No abstract available.
Authors
A. Keith Miles, Donald Calkins, Nancy C. Coon
Cross-boundary issues for National Parks: What works "on the ground."
In recent years, cross-boundary management has become an essential part of park management. In this article we compare the perspectives of managers of several US national parks to the advice on this issue presented in the published literature. Data were obtained from interviews of the superintendents, assistant superintendents and resources managers of five major western national parks and from a
Authors
M. Buechner, C. Schonewald-Cox, R. Sauvajot, B. Wilcox