Benthic invertebrate bioassays with toxic sediment and pore water
John P. Giesy, Cornell J. Rosiu, Robert L. Graney, Mary G. Henry
1990, Environmental Toxicology and Chemistry (9) 233-248
The relative sensitivities of bioassays to determine the toxicity of sediments were investigated and three methods of making the sample dilutions required to generate dose-response relationships were compared. The assays studied were: (a) Microtox®, a 15-min assay ofPhotobacterium phosphoreum bioluminescence inhibition by pore water; (b) 48-h Daphnia magnalethality test in pore water;...
Plant community structure in an oligohaline tidal marsh
J.S. Brewer, J.B. Grace
1990, Vegetatio (90) 93-107
An oligohaline tidal marsh on the northern shore of Lake Pontchartrain, LA was characterized with respect to the distributions and abundances of plant species over spatial and temporal gradients using Detrended Correspondence Analysis (DCA). In addition, the species distributions were correlated to several physical environmental factors using Detrended Canonical Correspondence...
Toxicokinetics of PAHs in Hexagenia
Guy R. Stehly, Peter F. Landrum, Mary G. Henry, C. Klemm
1990, Environmental Toxicology and Chemistry (9) 167-174
The accumulation kinetics of two waterborne polycyclic aromatic hydrocarbons (PAHs), benzo[a]pyrene (BAP) and phenanthrene (PHE), were studied in the mayfly nymph (Hexagenia limbata). The uptake clearance decreased while the bioconcentration of BAP increased with an increase in weight of the H. limbata nymph. The relationship between uptake clearance and bioconcentration for PHE was...
Mercury accumulation in yellow perch in Wisconsin seepage lakes: Relation to lake characteristics
W.G. Cope, J.G. Wiener, R.G. Rada
1990, Environmental Toxicology and Chemistry (9) 931-940
We studied relations between lacustrine characteristics and the total mercury (Hg) content of calendar age-2 yellow perch (Perca flavescens) in 10 seepage lakes in north-central Wisconsin. Mean concentrations and burdens (masses) of Hg in whole perch varied widely among lakes, were negatively correlated with lake pH and were positively correlated...
Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons
T. W. Custer, P. C. Frederick
1990, Condor (92) 772-775
The authors' objective was to describe egg size in relation to laying order for Great Egrets (Casmerodius albus ), Snowy Egrets (Egretta thula ), and Black-crowned Night-Herons (Nycticorax nycticorax ) in a southern Texas colony and Great Egrets in a southern Florida colony. Based on egg-size patterns in...
Estimating nest success: When Mayfield wins
Douglas H. Johnson, T.L. Shaffer
1990, The Auk (107) 595-600
The Apparent estimator of nest success may be severely biased because unsuccessful nests are less likely to be found than are successful nests. The Mayfield estimator is a preferred alternative. The situation is somewhat different for nests in colonies or on islands because of greater visibility of nests, higher synchrony...
Use of fish corrals in the seine fishery of the Virgin Islands
Cecil A. Jennings
1990, Marine Fisheries Review (52) 18-19
Although selected aspects of the commercial fishery in the Virgin Islands have been documented since the early 1930's, fish corrals and their use have not been described. This account, based on personal observations made during 1985-86, summarizes commercial fishing methods in the Virgin Islands (U.S. and British),...
Producing ducks using wire and electricity
J. T. Lokemoen
1990, South Carolina Waterfowl and Wetlands (4) 8-9
Abstract has not been submitted...
Decline of wildcelery buds in the lower Detroit River, 1950-85
Donald W. Schloesser, Bruce A. Manny
1990, Journal of Wildlife Management (54) 72-76
American wildcelery buds (Vallisneria americana), an abundant food eaten by diving ducks (Aythini) during migrations, decreased in the lower Detroit River of the Great Lakes from 1950 to 1985. Bud densities decreased at 2 (-14 and -18 buds/mA?) of 5 locations and were similar at 3 (-2, +2, and +3...
Fusarium spp. recovered from waste peanuts associated with sandhill crane mortality
P.E. Nelson, R.J. Cole, T.A. Tousson, J.W. Dorner, R. M. Windingstad
1990, Mycologia (82) 562-565
Approximately 5000 sandhill cranes (Grus canadensis ) died from undetermined causes in Gains County, Texas, 1985, and an additional 200 died in 1986. Prominent clinical signs were the inability of many sick cranes to hold their necks horizontal and the neck, head, and legs sometimes drooped perpendicularly during flight. Approximately...
Physical factors and their influence on the mussel fauna of a main channel border habitat of the upper Mississippi River
L. E. Holland Bartels
1990, Journal of the North American Benthological Society (9) 327-335
The habitats of mussel species in a portion of the main stem of Navigation Pool 10 of the upper Mississippi River were examined. Population composition, abundance, and sediment and current preferences were measured at 186 sites in the East Channel of the...
Nutrient reserve dynamics of breeding canvasbacks
Jeb A. Barzen, Jerome R. Serie
1990, The Auk (107) 75-85
We compared nutrients in reproductive and nonreproductive tissues of breeding Canvasbacks (Aythya valisineria) to assess the relative importance of endogenous reserves and exogenous foods. Fat reserves of females increased during rapid follicle growth and varied more widely in size during the early phase of this period. Females began laying with...
Induction of sporulation and the influence of time, temperature, and inoculum size on growth in two species of aquatic fungi (Saprolegniales)
T.A. Bailey, K. Bradford, C.E. Bland
1990, Journal of the Elisha Mitchell Scientific Society (106) 57-63
Because the infective stage of most mycoses of aquatic organisms is the zoospore, we attempted to establish optimum conditions under which zoospores could be produced for use in antifungal testing. Optimum sporulation time, incubation time, inoculum size, and growth temperature were determined for each oftwo saprolegniaceous fungi, Achlya flagellata Coker...
Improved method for sectioning pectoral spines of catfish for age determination
Marc A. Blouin, Glenda R. Hall
1990, Journal of Freshwater Ecology (5) 489-490
A modified low-speed saw provided fast and precise sectioning of catfish pectoral spines for use in aging studies. In one hour, 10–15 spines can be sectioned, the sections mounted, and the annuli counted. Two methods commonly used to section ictalurid pectoral spines are (1) acid decalcification, followed by the...
Contaminant residues in the bloater (Coregonus hoyi) of Lake Michigan, 1969-1986
Robert J. Hesselberg, James P. Hickey, David A. Nortrup, Wayne A. Willford
1990, Journal of Great Lakes Research (16) 121-129
Residues of DDT, PCBs, and dieldrin in Lake Michigan bloaters (Coregonus hoyi) decreased between 1969 and 1986. All values for contaminant residues were measured and reported as μg/g of whole fish, wet weight; the error limits represented the 95% confidence interval half widths. Total DDT content declined 87%, from 9.9...
Effect of pH on the accumulation kinetics of pentachlorophenol in goldfish
G. R. Stehly, W. L. Hayton
1990, Archives of Environmental Contamination and Toxicology (19) 464-470
The kinetics of accumulation of pentachlorophenol (PCP) at various pH values were investigated to explore how pH-dependent accumulation might influence PCP toxicity. Goldfish (Carassius auratus) were exposed to 5 μg PCP/L in a static system buffered with 7.5 mM bicine orN,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid (BES) at pH 7.0, 8.0, or 9.0....
Mass-marking of otoliths of lake trout sac fry by temperature manipulation
Roger A. Bergstedt, Randy L. Eshenroder, Charles Bowen, James G. Seelye, Jeffrey C. Locke
1990, American Fisheries Society Symposium (7) 216-223
The otoliths of 676,000 sac fry of lake trout Salvelinus namaycush in 1986, and of 1,100,000 in 1987, were marked by daily manipulation of water temperature. The fish were stocked into Lake Huron in the spring. Otolith marks consisted of groups of daily growth rings accentuated into recognizable patterns by...
Host-parasite relationships and geographic distribution of Salmincola corpulentus (Copepoda: Lernaeopodidae) on bloater (Coregonus hoyi) stocks in Lake Huron
Charles A. Bowen, Ralph M. Stedman
1990, Canadian Journal of Zoology (68) 1988-1994
Examination of the branchial cavities of 8347 adult bloaters (Coregonus hoyi) collected from seven locations in Lake Huron for parasitic copepods yielded only the lernaeopodid Salmincola corpulentus; its distribution was limited to bloaters collected in the southern two-thirds of the lake. The infections were highest off Au Sable Point and on...
A bioaccumulation bioassay for freshwater sediments
Michael J. Mac, George E. Noguchi, Robert J. Hesselberg, Carol C. Edsall, John A. Shoesmith, James D. Bowker
1990, Environmental Toxicology and Chemistry (9) 1405-1414
A laboratory bioassay is described for determining the bioavailability of contaminants from freshwater sediments. The bioassay consists of 10-d exposures to whole sediments under flow-through conditions. After testing five species, the fathead minnow (Pimephales promelas) and the earthworm (Lubricus terrestris) were recommended for use in the test....
Recovery of an offshore lake trout (Salvelinus namaycush) population in eastern Lake Superior
Gary L. Curtis
1990, Journal of Great Lakes Research (16) 279-287
The lake trout (Salvelinus namaycush) population at Stannard Rock, Michigan, an isolated offshore reef in eastern Lake Superior, was monitored each spring from 1959–79 using a permit assessment gill net fishery. This population, like nearly all of those in inshore waters, declined to low levels during the years of intense...
Enhanced bioaccumulation of mercury, cadmium and lead in low-alkalinity waters: An emerging regional environmental problem
J.G. Wiener, P.M. Stokes
1990, Environmental Toxicology and Chemistry (9) 821-823
During the past decade or so, observations of high mercury concentrations in fish have renewed concerns and mercury, primarily in two groups of fresh waters: low-alkalinity lakes (the topic of this editorial) and newly created impoundments. The recent focus on the chemistry and biota of low-alkalinity (< 50...
A method of prioritizing small islands and shoals for conservation based on biological and aesthetic criteria
M. G. Knutson
1990, Thesis
Abstract not submitted to date...
Bird use of natural and restored woodlands
B.E. Kus
1990, Conference Paper
No abstract available at this time...
International position statement and evaluation guidelines for artificial reefs in the Great Lakes
John E. Gannon
1990, Special Publication 90-2
The purpose of this position statement is to guide the evaluation of artificial reef proposals in the Great Lakes so that any reefs built will enhance the fisheries and recreational uses of the lakes without adversely affecting natural resources or impeding other beneficial uses. This position statement sets minimum recommended...
The evolution of sex-change mechanisms in fishes
Robert M. Ross
1990, Environmental Biology of Fishes (29) 81-93
Five distinct sex-change mechanisms are identified among sequentially hermaphroditic fishes based on socio-ecological characteristics. The primary determinants of the sex-change mechanisms appear to be social organization and mating system, which in turn depend on resource distribution in space and time. The ability of a single individual to control all mating...
