J D Walker

Datos Biográficos

ID80800
NOMBREJ D Walker
NOMBRESJ D
APELLIDOWalker
FIRMAWALKER J D
AFILIACIONESUniversity of Minnesota
ORCID0000-0002-3706-2729
VERIFICADOSí
TOTAL DE OBRAS8
TOTAL DE CITAS19
TOTAL COMO AUTOR8
TOTAL COMO EDITOR0
PRIMER AÑO DE PUBLICACIÓN1992
AÑO MÁS RECIENTE DE PUBLICACIÓN2021
ÍNDICE H2

  • Life histories and niche dynamics in late Quaternary proboscideans from midwestern North America

    Open AccessChris Widga, Gregory W L Hodgins et al.ARTICLEQuaternary Research2021

    Stable isotopes of mammoths and mastodons have the potential to illuminate ecological changes in late Pleistocene landscapes and megafaunal populations as these species approached extinction. The ecological factors at play in this extinction remain unresolved, but isotopes of bone collagen (δ 13 C, δ 15 N) and tooth enamel (δ 13 C, δ 18 O, 87 Sr/ 86 Sr) from midwestern North America are leveraged to examine ecological and behavioral changes that …

  • Group peer assessment for summative evaluation in a graduate-level statistics course for ecologists

    Althea ArchMiller, Althea A ArchMiller et al.ARTICLEAssessment & Evaluation in Higher…2017

    Peer assessment is often used for formative learning, but few studies have examined the validity of group-based peer assessment for the summative evaluation of course assignments. The present study contributes to the literature by using online technology (the course management system MoodleTM) to implement structured, summative peer review based on an anchored rubric in an ecological statistics course taught to graduate students. We found that gr…

  • Variability in Bioavailable 87 Sr/ 86 Sr in the North American Midcontinent

    Open AccessChris Widga, J D Walker et al.ARTICLEOpen Quaternary2017Citada por: 8Referencias: 30

    Strontium (Sr) isotope tracers are useful for understanding provenance and mobility in biological materials across multiple disciplines. However, the impact of these techniques is highly dependent on the construction of appropriate comparative baselines (i.e., an isoscape). We present the results of a systematic survey of87Sr/86Sr values from grasses in the North American Midcontinent with a particular emphasis on sedimentary systems. Although87S…

  • It's not about seat time

    Open AccessPaul Baepler, J D Walker et al.ARTICLEComputers & Education2014

  • Middle Holocene Bison diet and mobility in the eastern Great Plains (USA) based on δ 13 C, δ 18 O, and 87 Sr/ 86 Sr analyses of tooth enamel carbonate

    Open AccessChris Widga, J D Walker et al.ARTICLEQuaternary Research2010

    During the Holocene, bison ( Bison bison) were key components of the Great Plains landscape. This study utilizes serial stable isotope analyses (tooth enamel carbonate) of 29 individuals from five middle Holocene (∽ 7–8.5·ka) archaeological sites to address seasonal variability in movement patterns and grazing behavior of bison populations in the eastern Great Plains. Stable carbon isotopes ( δ 13 C) indicate a bison diet that is similar to the C…

  • Infant Killing, Wounding and Predation in Eulemur and Lemur

    Open AccessA Jolly, S Caless et al.ARTICLEInternational Journal of…2000Citada por: 11Referencias: 43

  • The Misrepresentation of Diop's Views

    Open AccessJ D WalkerARTICLEJournal of Black Studies1995

    The late Cheikh Anta Diop was perhaps the strongest opponent from Africa of bias in historical scholarship, broadly defined. His work and purpose have been frequently misunderstood and misinterpreted. It is also very likely that his views, or some of them, have been seriously misrepresented. The purpose of this brief essay is to examine in a preliminary fashion recent statements or implications about Diop by a team from the Universities of Michig…

  • Tobacco sales

    Sébastien JM Moreau, S Moreau et al.ARTICLETobacco Control1992