Co-existence of zebra mussels and freshwater unionids: Population dynamics of Leptodea fragilis in a coastal wetland infested with zebra mussels
S. Jerrine Nichols, Jon Amberg
1999, Canadian Journal of Zoology (77) 423-432
In 1996, thousands of live Leptodea fragilis were collected from a marsh located in the western basin of Lake Erie that was infested with zebra mussels (Dreissena polymorpha). Despite the presence of zebra mussels at this site for a number of years, this L. fragilis population showed no signs of competition-induced changes in population dynamics....
Establishment of woody riparian species from natural seedfall at a former gravel pit
J. E. Roelle, D.N. Gladwin
1999, Restoration Ecology (7) 183-192
Establishment of native riparian communities through natural seedfall may be a viable reclamation alternative at some alluvial sand and gravel mines where water level can be controlled in the abandoned pit. We experimented with this approach at a pit in Fort Collins, Colorado, where a drain culvert equipped with a...
Environmental influences on potential recruitment of pink shrimp, Fatlantopenaeus duorarum, from Florida Bay nursery grounds
Joan A. Browder, V.R. Restrepo, J.K. Rice, M. B. Robblee, Z. Zein-Eldin
1999, Estuaries (22) 484-499
Two modeling approaches were used to explore the basis for variation in recruitment of pink shrimp, Farfantepenaeus duorarum, to the Tortugas fishing grounds. Emphasis was on development and juvenile densities on the nursery grounds. An exploratory simulation modeling exercise demonstrated large year-to-year variations in recruitment contributions to the Tortugas rink...
Liquefaction evidence for at least two strong Holocene paleo-earthquakes in central and southwestern Illinois, USA
W.E. McNulty, S. F. Obermeier
1999, Environmental & Engineering Geoscience (5) 133-146
Two strong mid-Holocene earthquakes in Illinois have been documented by paleoliquefaction features such as clastic dikes, sills, and detachments of fine-grained sediment that sunk into liquefied sand. At least one paleo-earthquake occurred in central Illinois about 35 km NE of Springfield, probably sometime...
Trace-element concentrations in streambed sediment across the conterminous United States
Karen C. Rice
1999, Environmental Science & Technology (33) 2499-2504
Trace-element concentrations in 541 streambed-sediment samples collected from 20 study areas across the conterminous United States were examined as part of the National Water-Quality Assessment Program of the U.S. Geological Survey. Sediment samples were sieved and the <63-μm fraction was retained for determination of total concentrations of trace elements. Aluminum,...
The types of data needed for assessing the environmental and human health impacts of coal
R. B. Finkelman, P.M.K. Gross
1999, International Journal of Coal Geology (40) 91-101
Coal is one of the most important sources of energy. Its worldwide use will continue to expand during the next several decades, particularly in rapidly developing countries such as China and India. Unfortunately, coal use may bring with it environmental and human health costs. Many of the environmental and health...
The insignificance of statistical significance testing
Douglas H. Johnson
1999, Journal of Wildlife Management (63) 763-772
Despite their use in scientific journals such as The Journal of Wildlife Management, statistical hypothesis tests add very little value to the products of research. Indeed, they frequently confuse the interpretation of data. This paper describes how statistical hypothesis tests are often viewed, and then contrasts that interpretation with the...
Density and fledging success of grassland birds in Conservation Reserve Program fields in North Dakota and west-central Minnesota
Rolf R. Koford
1999, Studies in Avian Biology (19) 187-195
The Conservation Reserve Program, initiated in 1985, was designed primarily to reduce soil erosion and crop surpluses. A secondary benefit was the provision of habitat for wildlife. Grassland bird populations, many of which declined in the decades prior to the Conservation Reserve Program, may have benefited from the Conservation Reserve...
On the relative importance of pool morphology and woody debris to distributions of shrimp in a Puerto Rican headwater stream
M. Pyron, A.P. Covich, R. W. Black
1999, Hydrobiologia (405) 207-215
In this paper, we report the sizes and distributional orientation of woody debris in a headwater rainforest stream in the Luquillo Experimental Forest (LEF), Puerto Rico. We also provide results of a 4-month study of a wood addition experiment designed to increase cover for benthic macroinvertebrates (freshwater shrimp). We added...
The relative importance of light and nutrient limitation of phytoplankton growth: A simple index of coastal ecosystem sensitivity to nutrient enrichment
J. E. Cloern
1999, Aquatic Ecology (33) 3-16
Anthropogenic nutrient enrichment of the coastal zone is now a well-established fact. However, there is still uncertainty about the mechanisms through which nutrient enrichment can disrupt biological communities and ecosystem processes in the coastal zone. For example, while some estuaries exhibit classic symptoms of acute eutrophication, including enhanced production of...
Killing of a muskox, Ovibos moschatus, by two wolves, Canis lupis, and subsequent caching
L. David Mech, Layne G. Adams
1999, Canadian Field-Naturalist (113) 673-675
The killing of a cow Muskox (Ovibos moschatus) by two Wolves (Canis lupus) in 5 minutes during summer on Ellesmere Island is described. After two of the four feedings observed, one Wolf cached a leg and regurgitated food as far as 2.3 km away and probably farther. The implications of...
General geology and geomorphology of the Mars Pathfinder landing site
A. W. Ward, Lisa R. Gaddis, Randolph L. Kirk, Laurence A. Soderblom, K. L. Tanaka, M.P. Golombek, T. J. Parker, Ronald Greeley, R.O. Kuzmin
1999, Journal of Geophysical Research E: Planets (104) 8555-8571
The Mars Pathfinder (MPF) spacecraft landed on relatively young (late Hesperian-early Amazonian; 3.1-0.7 Ga) plains in Chryse Planitia near the mouth of Ares Vallis. Images returned from the spacecraft reveal a complex landscape of ridges and troughs, large hills and crater rims, rocks and boulders of various sizes and shapes,...
The effects of crude oil and remediation burning on three clones of smooth cordgrass (Spartina alterniflora loisel.)
D.L. Smith, C.E. Proffitt
1999, Estuaries (22) 616-623
Burning has been employed as an oil spill remediation technique in coastal marshes, even though the combined and interactive effects of oil and burning on vegetation are poorly understood. Variation among clones of perennial marsh grasses in response to these perturbations is not known. We performed a greenhouse experiment designed...
Additional records of bats from the middle Rio Grande Valley, New Mexico
Ernest W. Valdez, James N. Stuart, Michael A. Bogan
1999, Southwestern Naturalist (44) 398-400
The resident and migratory bat fauna of the middle Rio Grande Valley in central New Mexico is inadequately known. Many of the specimen records from this valley are from Bosque del Apache National Wildlife Refuge, ca. 20 km S of Socorro, Socorro Co. Findley et al. (1975) reported Myotis...
Nonlinear soil response in the vicinity of the Van Normal Complex following the 1994 Northridge, California, earthquake
G. Cultrera, D.M. Boore, W. B. Joyner, C.M. Dietel
1999, Bulletin of the Seismological Society of America (89) 1214-1231
Ground-motion recording obtaineds at the Van Norman Complex from the 1994 Northridge, California, mainshock and its aftershocks constitute an excellent data set for the analysis of soil response as a function of ground-motion amplitude. We searched for nonlinear response by comparing the Fourier...
Funnel traps capture a higher proportion of juvenile Great Tits parus major than automatic traps
J.C. Senar, J. Domenech, M.J. Conroy
1999, Ringing and Migration (19) 257-259
We compared capture rates of Great Tits at funnel traps, where several birds can be captured at once so that some decoy effect may appear, to those obtained at automatic traps, where only one bird can be trapped at a time, at trapping stations in northeastern Spain. Juvenile birds were...
Seroepidemiology of upper respiratory tract disease in the desert tortoise of California
Mary B. Brown, Kristin H. Berry, Isabella M. Schumacher, Kenneth A. Nagy, Mary M. Christopher, Paul A. Klein
1999, Journal of Wildlife Diseases (35) 716-727
Several factors have combined with an upper respiratory tract disease (URTD) to produce declines on some population numbers of desert tortoises (Gopherus agassizii) in the western USA. This study was designed to determine the seroepidemiology of URTD in a population of wild adult tortoises at the Desert Tortoise Research Natural...
Early Devonian (late Emsian) Brachiopods from Zhongping, Xiangzhou, central Guangxi, China
X.-Q. Chen, Z.-G. Yao
1999, Senckenbergiana Lethaea (79) 223-265
The brachiopod fauna (20 species in 6 genera) from the Ma'anshan section of the Emsian Dale Formation at Zhongping, Xiangzhou county, central Guangxi is described. The fauna is dominated by spire-bearing brachiopods. One new genus and 4 new species are proposed: the smooth-shelled, septalium-bearing Lubricospirifer gumoensis gen. et sp. nov.,...
Sidescan-sonar mapping of benthic trawl marks on the shelf and slope off Eureka, California
A. M. Friedlander, G.W. Boehlert, M.E. Field, J.E. Mason, J.V. Gardner, P. Dartnell
1999, Fishery Bulletin (97) 786-801
The abundance and orientation of trawl marks was quantified over an extensive portion (>2700 km2) of the Eureka, California, outer shelf and slope, an important commercial bottom trawling ground for such high-value species as rockfish, sole, and sablefish. Fishing logbook data indicate that the entire reporting area was trawled about...
Etologia aplicada al manejo de especies amenazadas: el caso del turon de patas negras (Mustela nigripes)
Astrid Vargas, D. Biggins, B. Miller
1999, Etologia 33-39
Los turones de patas negras (Mustela nigripes) son considerados como uno de los mamíferos más amenazados del mundo. La última población silvestre fue descubierta en 1981 en Meeteetse, Wyoming, y en 1985 se extinguió debido a una epidemia de moquillo canino en combinacion con una epidemia de peste bubónica. Antes de...
A record of hydrocarbon input to San Francisco Bay as traced by biomarker profiles in surface sediment and sediment cores
F. D. Hostettler, W. E. Pereira, K.A. Kvenvolden, A. VanGeen, S. N. Luoma, C. C. Fuller, R. Anima
1999, Marine Chemistry (64) 115-127
San Francisco Bay is one of the world's largest urbanized estuarine systems. Its water and sediment receive organic input from a wide variety of sources; much of this organic material is anthropogenically derived. To document the spatial and historical record of the organic contaminant input, surficial sediment from 17 sites...
Observations of turbulence in a partially stratified estuary
M.T. Stagey, Stephen G. Monismith, J.R. Burau
1999, Journal of Physical Oceanography (29) 1950-1970
The authors present a field study of estuarine turbulence in which profiles of Reynolds stresses were directly measured using an ADCP throughout a 25-h tidal day. The dataset that is discussed quantifies turbulent mixing for a water column in northern San Francisco Bay that experiences a sequence of states that...
Tools for groundwater protection planning: An example from McHenry County, Illinois, USA
R. C. Berg, B. Brandon Curry, R. Olshansky
1999, Environmental Management (23) 321-331
This paper presents an approach for producing aquifer sensitivity maps from three-dimensional geologic maps, called stack-unit maps. Stack-unit maps depict the succession of geologic materials to a given depth, and aquifer sensitivity maps interpret the successions according to their ability to transmit potential contaminants. Using McHenry County, Illinois, as a...
A CALFED-supported study of the Delta’s foodweb base
J. E. Cloern
1999, Interagency Ecological Program Newsletter (12) 19-20
Scientists from six universities and the US Geological Survey (USGS) have begun a new project to characterize the food resource which supports secondary production in different habitats of the Sacramento-San Joaquin Delta. The project is supported by CALFED Category III, USGS, and the IEP; it is designed to answer basic...
Large-magnitude, late Holocene earthquakes on the Genoa fault, West-Central Nevada and Eastern California
A. R. Ramelli, J. W. Bell, C.M. DePolo, J. C. Yount
1999, Bulletin of the Seismological Society of America (89) 1458-1472
The Genoa fault, a principal normal fault of the transition zone between the Basin and Range Province and the northern Sierra Nevada, displays a large and conspicuous prehistoric scarp. Three trenches excavated across this scarp exposed two large-displacement, late Holocene events. Two of the trenches contained multiple layers of stratified...
