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Publications

Below are publications authored by or coauthored by our experts here at Orbis

Bats

Habitat use by bats in two Indiana forests prior to silvicultural treatments for oak regeneration, Jeremy J. Sheets, Joseph E. Duchamp, Megan K. Caylor, Laura D’Acunto, John O. Whitaker, Jr., Virgil Brack, Jr., and Dale W. Sparks 

Bats of the hardwood ecosystem experiment before timber harvest: assessment and prognosis,Jeremy J. Sheets, John O. Whitaker, Jr., Virgil Brack, Jr., and Dale W. Sparks 

Questions and Answers Concerning Developers and Northern Long-Eared Bat, Jeremy J. Sheets 

Botany and Plant Ecology 

Daily Dose of Botany Articles,* Scott Namestnik 

Two Recent Plant Discoveries in Missouri, Scott Namestnik, Justin R. Thomas, Bradford S. Slaughter 

New Records for Utricularia resupinata in Indiana, Scott Namestnik, Robin W. Scribailo, Mitchell S. Alix 

Noteworthy Collections, Indiana, Scott Namestnik 

Noteworthy Collections, Mimulus alatus, Scott Namestnik 

The Discovery of Rhexia mariana L. var. mariana (Melastomataceae) in Northwest Indiana, Scott Namestnik Client Relationships 

Toward a Healthy Consultant-Client Relationship, J. Ryan Duddleson, M.A., RPA 

Cultural Resources 

The Disconnect Between College and the Real World of Archaeology, AlyciaGiedd, M.A. 

How Proactive Planning for Cultural Resources Can Help Manage the Risks of Project Delay (or Worse…), J. Ryan Duddleson, M.A., RPA 

How Places Important to Our Past Can Contribute to Our Future – the Economics of Preservation, J. Ryan Duddleson M.A., RPA 

Integrated Management of Cultural and Natural Resources, J. Ryan Duddleson, M.A., RPA 

Ten Sources for Background Research – why you shouldn’t look for archaeological sites on your desktop, J. Ryan Duddleson, M.A., RPA 

The Role of Trees in Historic Neighborhoods, J. Ryan Duddleson, M.A., RPA 

Floristic Studies 

The Vascular Flora of Sebert Property, Laporte County, Indiana, Scott Namestnik, Keith Board 

Results of the LobLolly Marsh Wetland Preserve BioBlitz, Jay County, Indiana, Scott Namestnik, Donald G. Ruch, Daryl R. Karns, Paul McMurray, Jean Moore-Palm, William Murphy, and Kirk Roth 

Vegetation Monitoring

The Critical Importance of Vegetation Surveys, Scott Namestnik 

The Use of Floristic Quality Assessment as a Tool for Monitoring Wetland Mitigations in Michigan, Scott Namestnik, Leslie Smit DeBoer, Paul E. Rothrock, Robert T. Reber 

WildlifeBiology

Urban Ichthyology, Jeremy J. Sheets, Christopher M. Ritzi, Brianne L. Everson, B. Jagger Foster, Dale W. Sparks 

*Originally appeared in The Plant Press, the regular publication of the Indiana Native Plant and Wildflower Society – North Chapter

Tessa M. Aby-Kruger

Botanist

Tessa is a geologist, botanist and vegetation ecologist with over 10 years of experience managing and conducting projects, specializing in ecological and floristic inventories, rare plant surveys, and vegetation monitoring. She also performs wetland evaluations and is a guided hike leader.

Jeremy Sheets

Senior Wildlife Biologist, Vice President

Jeremy is a founding member of Orbis and directs its ecological and wildlife surveys, assessment and planning services, and brings over 20 years’ experience conducting various wildlife surveys with a focus on bat ecology and urban wildlife management.


Jeremy has managed wildlife projects for private firms and the public sector including for wind facilities, pipelines, roadways, military bases, and airports. Jeremy is proficient in wildlife management/control techniques, wildlife identification, threatened and endangered species, and surveying and analysis techniques for mammals, birds, reptiles, amphibians, fish, and insects. Jeremy is a Federal Aviation Administration (FAA) Qualified Airport Wildlife Biologists who develop Wildlife Hazard Assessments (WHA) and Wildlife Hazard Management Plans (WHMP) for airports. Jeremy is qualified to inspect erosion, sediment and stormwater plans, and their implementation. Furthermore, Jeremy is federally permitted to conduct endangered bat surveys in USFWS Regions 3, 4, 5, and 6 and includes acoustic surveys, mist-netting, and radio telemetry.

J Ryan Duddleson​

Senior Archaeologist, Principal

Ryan is a founding member of Orbis and directs its cultural resource management services, and brings over 20 years’ experience helping clients assess and minimize the risk of impacting places with cultural value.


Ryan works with public sector clients including federal, state, and municipal government, as well as private firms in energy, transportation, industrial, and development sectors. He also coordinates with agencies and consulting parties involved with the National Environmental Policy Act, Section 106 of the National Historic Preservation Act, and other related cultural resource laws and regulations. He performs archival research, analysis, and excavation. Ryan also has experience in artifact and archival curation. He has applied innovative techniques to traditional artifact analysis, such as examining organic residues from prehistoric pottery to determine prior contents. Ryan also has experience with human remains in archaeological settings. Ryan meets the Secretary of the Interior’s Standards and Guidelines for Archaeology and Historic Preservation, 48 FR. 44716 and is a Qualified Professional Archaeologist in Indiana, Illinois, Iowa, Michigan, Ohio, Pennsylvania, and Wisconsin.