Scientists & Staff

Extracting a northern goshawk from a net.

Mariko Yamasaki

Team Leader / Research Wildlife Biologist
271 Mast Road
Durham, NH, 03824
Phone: 603-868-7659

Contact Mariko Yamasaki

Current Research

I work on forest management issues that affect the quality and quantity of vertebrate wildlife habitat availability in the northeastern US, and I provide useful wildlife-silvicultural habitat guidance for forest managers on working forest landscapes and across non-industrial forest landscapes.

Research Interests

We continue to work on the influence of silvicultural practices and land capability on species-habitat relationships across working forest landscapes as well as urbanizing forest landscapes. Forest raptors, passerine birds, small mammals, bats, and salamanders provide numerous opportunities to investigate these habitat relationships for forest managers desiring integrated wildlife/timber practices in northern forest ecosystems. We also have an increasing interest in the level of contaminants, particularly mercury, in forest-dwelling species.

Why This Research is Important

There is a pressing need to provide forest managers with information and strategies to maintain vertebrate diversity and habitat quality in the face of increasing urbanization of forest landscapes in the northeastern US as well as provide guidance to forest managers on working forest landscapes.


  • University of Michigan, M.S. Natural Resources (Wildlife),
  • University of Michigan, B.S. Anthropology-Zoology,

Professional Organizations

  • The Wildlife Society
  • Society of American Foresters (SAF)
  • American Society of Mammalogists and Raptor Research Foundation
  • USGS Bird Banding Lab

Featured Publications & Products

Publications & Products

Research Datasets

  • Leak, William B.; Yamasaki, Mariko; Belair, Ethan P.; Knapp, Rachel A.; Brissette, John C. 2017. Bartlett Experimental Forest permanent cruise plot data. Fort Collins, CO: Forest Service Research Data Archive.

National Research Highlights

LiDAR-derived map of canopy cover for the Bartlett Experimental Forest and surrounding area. Values are a percentage; the dark blue colors are 100 percent canopy closure. Coeli M Hoover, U.S. Department of Agriculture Forest Service.

LiDAR: A Bird’s-Eye Look at Wildlife Habitat

Year: 2016

Wildlife species often prefer habitats with specific characteristics. For example, many birds need dense brushy areas where they can safely nest, feed young, complete their growth, and prepare for migration. LiDAR, or Light Detection and Ranging, data give us a bird’s-eye view at the landscape level to help locate areas that might meet the habitat needs of species of concern to managers.

Bartlett Haystack Mountains, Bartlett, N.H. U.S. Department of Agriculture Forest Service.

Has Climate Affected Tree Species Distribution in New England?

Year: 2016

Remeasurement of plots 70 years after establishment on the White Mountain National Forest shows no evidence of changes in elevations among climate-sensitive species.

Whole-tree harvest in 1935. Bartlett Experimental Forest, Bartlett, NH.  USDA Forest Service

No Signifigant Losses of Stand Productivity From Whole-tree Harvesting and Clearcutting in New England Forests

Year: 2015

Silviculturalists have been concerned over nutrient losses from clearcutting and, more recently, whole-tree harvesting in New England since the late 1960s. Recent information from studies in New Hampshire and Maine show there are no significant losses of essential nutrients and stand productivity following these harvest methods.

Looking east toward the Attitash Mountain Range from the Bartlett Experimental Forest, NH. Ken Dudzik, USDA Forest Service

Silvicultural Guide for Northern Hardwoods in the Northeast Updated

Year: 2014

This revision of the 1987 silvicultural guide updates and expands the silvicultural information on northern hardwoods. It provides additional information on wildlife habitat and managing mixed-wood and northern hardwood-oak stand.

Shrubland Birds and Their Habitats

Year: 2010

Shrubland birds, such as prairie warblers and field sparrows require constant habitat management, and thus, reliable and specific knowledge to guide management efforts is urgently needed. NRS researchers David King and Mariko Yamasaki have been providing expert advice based on their research for state and federal land managers as well as private individuals, in both formal and informal settings.

Last modified: Thursday, September 10, 2015