Publications
These publications showcase the significant science conducted in our Science Centers.
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Modeling association among demographic parameters in analysis of open population capture-recapture data
We present a hierarchical extension of the Cormack–Jolly–Seber (CJS) model for open population capture–recapture data. In addition to recaptures of marked animals, we model first captures of animals and losses on capture. The parameter set includes capture probabilities, survival rates, and birth rates. The survival rates and birth rates are treated as a random sample from a bivariate distribution
Authors
William A. Link, Richard J. Barker
Winter status of White-eyed Vireos in northeastern Louisiana
In December 2004, February 2005, and June 2005, we recaptured a White-eyed Vireo (Vireo griseus) that was banded on 19 May 2004 at the same location on the Tensas River National Wildlife Refuge, Madison Parish, LA. This is the first documented permanent resident White-eyed Vireo outside of resident populations known from Florida and southern Texas. This individual appears to be resident near the
Authors
S.G. Somershoe, D.J. Twedt
Modeling anuran detection and site occupancy on North American Amphibian Monitoring Program (NAAMP) routes in Maryland
One of the most fundamental problems in monitoring animal populations is that of imperfect detection. Although imperfect detection can be modeled, studies examining patterns in occurrence often ignore detection and thus fail to properly partition variation in detection from that of occurrence. In this study, we used anuran calling survey data collected on North American Amphibian Monitoring Progra
Authors
Linda Weir, J. Andrew Royle, Priya Nanjappa, Robin E. Jung
Designing occupancy studies: General advice and allocating survey effort
1.The fraction of sampling units in a landscape where a target species is present (occupancy) is an extensively used concept in ecology. Yet in many applications the species will not always be detected in a sampling unit even when present, resulting in biased estimates of occupancy. Given that sampling units are surveyed repeatedly within a relatively short timeframe, a number of similar methods h
Authors
Darryl I. MacKenzie, J. Andrew Royle
Efficacy of selected coccidiostats in sandhill cranes (Grus canadensis) following challenge
The anticoccidial efficacy of amprolium, clazuril, and monensin were studied in sandhill cranes (Grus canadensis) infected with a mixture of Eimeria spp. oocysts. Five groups of four 1-day-old sandhill crane chicks were maintained on a crumbled ration containing no coccidiostat, amprolium at 2.2 ppm, clazuril at 1.1 ppm, clazuril at 5.5 ppm, or monensin at 99 ppm. After 2 wk on their respective fe
Authors
James W. Carpenter, Meliton N. Novilla, Jeffrey Hatfield
Surface elevation dynamics in a regenerating mangrove forest at Homebush Bay, Australia
Following the dieback of an interior portion of a mangrove forest at Homebush Bay, Australia, surface elevation tables and feldspar marker horizons were installed in the impacted, intermediate and control forest to measure vertical accretion, elevation change, and shallow subsidence. The objectives of the study were to determine current vertical accretion and elevation change rates as a guide to u
Authors
K. Rogers, N. Saintilan, D. Cahoon
Geology and nonfuel mineral deposits of Greenland, Europe, Russia, and northern Central Asia
No abstract available.
Authors
Warren J. Nokleberg, Walter J. Bawiec, Jeff L. Doebrich, Bruce R. Lipin, Robert J. Miller, Greta J. Orris, Michael L. Zientek
Strength and acoustic properties of Ottawa sand containing laboratory-formed methane gas hydrate
Although gas hydrate occurs in a wide variety of sediment types and is present and even pervasive at some locations on continental margins, little is known about how it forms naturally. Physical properties of the resultant gas hydrate-sediment mixtures, data needed for input into models that predict location and quantity of in situ hydrate are also lacking. Not only do properties of the host mater
Authors
William J. Winters, William F. Waite, David H. Mason
The history of recent limnological changes and human impact on Upper Klamath Lake, Oregon
Hypereutrophic Upper Klamath Lake has been studied for almost 50 years to evaluate the nature, cause, and effects of its very productive waters. Mitigation of undesirable effects of massive cyanobacterial blooms requires understanding their modern causes as well as their history. Knowledge of the pre-settlement natural limnology of this system can provide guidelines for lake restoration and manage
Authors
J. Platt Bradbury, Steve M. Colman, Richard L. Reynolds
Analysis of summer 2002 melt extent on the Greenland ice sheet using MODIS and SSM/I data
Previous work has shown that the summer of 2002 had the greatest area of snow melt extent on the Greenland ice sheet ever recorded using passive-microwave data. In this paper, we compare the 0deg isotherm derived from the Moderate-Resolution Imaging Spectroradiometer (MODIS) instrument, with Special Sensor Microwave/Imager (SSM/I)-derived melt, at the time of the maximum melt extent in 2002. To va
Authors
D. K. Hall, R.S. Williams, K. Steffen, Janet Y.L. Chien
Paleolimnology and paleoclimate studies in Upper Klamath Lake, Oregon
The subsiding Upper Klamath Lake Basin contains sediments that were continuously deposited in a shallow, freshwater lake for more than 40 000 years. Well dated by radiometric methods and containing volcanic ashes of known age, these sediments constitute a valuable paleoclimate record. Sediment constituents and properties that reflect past climatic conditions in the area include pollen, diatoms, se
Authors
S.M. Colman, J. Platt Bradbury, Joseph G. Rosenbaum