Publications
This is a list of publications written by Patuxent employees since Patuxent opened in 1939. To search for Patuxent's publications by author or title, please click below to go to the USGS Publication Warehouse.
Filter Total Items: 8128
Wolf nipple measurements as indices of age and breeding status Wolf nipple measurements as indices of age and breeding status
We measured nipple sizes of 29 captive wolves (Canis lupus), of known breeding histories, throughout the year and tested distinctions among various known breeding statuses of 20 wild wolves examined in northeastern Minnesota from May through September. For ca. 8 mo of the year only breeders and nonbreeders can be classified. Distinctions between current and former breeders were not...
Authors
L. David Mech, Thomas J. Meier, Ulysses S. Seal
Relative effects of nutrient enrichment and grazing on epiphyte-macrophyte (Zostera marina L.) dynamics Relative effects of nutrient enrichment and grazing on epiphyte-macrophyte (Zostera marina L.) dynamics
The independent and interactive effects of nutrient concentration and epiphyte grazers on epiphyte biomass and macrophyte growth and production were examined in Zostera marina L. (eelgrass) microcosms. Experiments were conducted during early summer, late summer, fall, and spring in a greenhouse on the York River estuary of Chesapeake Bay. Nutrient treatments consisted of ambient or...
Authors
Hilary A. Neckles, R. L. Wetzel, R.J. Orth
Simulation testing of unbiasedness of variance estimators Simulation testing of unbiasedness of variance estimators
In this article I address the evaluation of estimators of variance for parameter estimates. Given an unbiased estimator X of a parameter θ, and an estimator V of the variance of X, how does one test (via simulation) whether V is an unbiased estimator of the variance of X? The derivation of the test statistic illustrates the need for care in substituting consistent estimators for unknown...
Authors
William A. Link
The common wolf snake, Lycodon aulicus capucinus, a recent colonist of Christmas Island in the Indian Ocean The common wolf snake, Lycodon aulicus capucinus, a recent colonist of Christmas Island in the Indian Ocean
The discovery of the common wolf snake, Lycodon aulicus capucinus, on Christmas I . in the Indian Ocean suggests that individuals of the species have colonised the island recently. On the basis of biological information for this widespread colubrid snake and for the brown tree snake, Boiga irregularis, a well-documented pest species on Guam, the establishment of the common wolf snake...
Authors
T. H. Fritts
The effects of hurricanes on birds, with special reference to Caribbean islands The effects of hurricanes on birds, with special reference to Caribbean islands
Cyclonic storms, variously called typhoons, cyclones, or hurricanes (henceforth, hurricanes), are common in many parts of the world, where their frequent occurrence can have both direct and indirect effects on bird populations. Direct effects of hurricanes include mortality from exposure to hurricane winds, rains, and storm surges, and geographic displacement of individuals by storm...
Authors
James W. Wiley, Joseph M. Wunderle
Problems and practices in backcountry recreation management: A survey of National Park Service managers Problems and practices in backcountry recreation management: A survey of National Park Service managers
No abstract available.
Authors
J. L. Marion, J.W. Roggenbuck, R.E. Manning
[Letter to the editor] Idolizing wolves [Letter to the editor] Idolizing wolves
No abstract available.
Authors
L.D. Mech
The mating behavior of Iguana iguana (Part 2) The mating behavior of Iguana iguana (Part 2)
No abstract available.
Authors
G.H. Rodda
Efficiency and optimal allocation in the staggered entry design Efficiency and optimal allocation in the staggered entry design
The staggered entry design for survival analysis specifies that r left-truncated samples are to be used in estimation of a population survival function. The ith sample is taken at time Bi, from the subpopulation of individuals having survival time exceeding Bi. This paper investigates the performance of the staggered entry design relative to the usual design in which all samples have a...
Authors
W.A. Link