Forest statistics for Vermont, 1973 and 1983 /

Frieswyk, Thomas S.; Malley, Anne M.

doi:10.5962/bhl.title.70023

Cited by 12 publications

(12 citation statements)

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“…Although redstart populations remained stable in this region during the 29 years of BBS data, a more detailed look at the BBS data suggests a further division of the region into areas corresponding to southern Vermont, where redstart abundance increased, and southern New Hampshire, where it decreased (P.D.H., unpublished data). This may be due to slightly different landscapes in these two southern subregions: Vermont has a higher percentage of hardwood forest (Frieswyk & Malley 1985a), whereas New Hampshire has more pine (Frieswyk & Malley 1985b), and the recent decline in sapling cover was more extreme in New Hampshire than in Vermont. These differences exist between northern Vermont and northern New Hampshire as well, but the two states are much more similar there than in the south.…”

Section: Discussionmentioning

confidence: 99%

Evidence from a Landscape Population Model of the Importance of Early Successional Habitat to the American Redstart

Hunt¹

1998

Conservation Biology

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Several lines of evidence indicate declines in American Redstart (Setophaga ruticilla) populations in northeastern NorthAmerica. I used data on historical changes in forest characteristics to test the hypothesis that these declines are a consequence of forest maturation and subsequent loss of the early successional habitats preferred by redstarts. Comparison of Breeding Bird Survey data on redstart abundance with those on habitat change in Vermont and New Hampshire revealed two major patterns. In three regions, redstart abundance was positively correlated with the amount of early successional habitat, whereas in two others it was positively correlated with total forest area. A mathematical model incorporating historical patterns of habitat change generated population trajectories that were reasonable approximations of the Breeding Bird Survey data for five of six regions when parameterized to reflect the higher suitability of early successional habitats. For this model to approximate observed trends, redstarts had to occur at higher densities in early successional habitats and experience higher nest success and juvenile survival there than in mature forest. In particular, unless nest success in early successional habitats was higher than published values for mature forest, simulated populations declined toward extinction. These results suggest that mature forests may frequently function as sink habitats for American Redstarts and that recent redstart population declines have resulted from losses of early successional habitat.Evidencia de la Importancia del Hábitat de Sucesión Temprana para Setophaga ruticilla Mediante un Modelo Poblacional de Paisaje Resumen: Varias líneas de evidencia indican disminuciones en las poblaciones de Setophaga ruticilla en el noreste de Norte América. Utilicé datos de cambios históricos en las características del bosque para evaluar la hipótesis de que estas disminuciones son una consecuencia de la maduración del bosque y la pérdida subsecuente de los hábitats de sucesión tempranos preferidos por S. ruticilla. Comparaciones de datos de S. ruticilla del Programa de Observaciones de Anidación de Aves con datos de cambio de hábitat en Vermont y New Hampshire revelan dos patrones principales. En tres regiones la abundancia de S. ruticilla estuvo positivamente correlacionada con la cantidad de hábitat sucesional temprano, mientras que en otras dos, estuvo positivamente correlacionada con el área total del bosque. Un modelo matemático que incorpora los patrones históricos de cambio del hábitat generó trayectorias poblacionales que resultaron ser aproximaciones razonables a los datos obtenidos de las observaciones de anidación para cinco de seis regiones en las que se modeló para reflejar la máxima viabilidad de hábitats sucesionales tempranos. Según este modelo, para que S. ruticilla se aproxime a las tendencias observadas, la especie tiene que ocurrir en grandes densidades en los hábi-tats sucesionales tempranos y experimentar un éxito de anidación mayor en estos lugares que en los bosques...

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Section: Discussionmentioning

confidence: 99%

Evidence from a Landscape Population Model of the Importance of Early Successional Habitat to the American Redstart

Hunt¹

1998

Conservation Biology

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“…This inventory was a cooperative effort of the Northern Research Station, the Vermont Department of Forests, Parks and Recreation, and landowners of Vermont, and is the culmination of the fi rst complete inventory of Vermont's forests using FIA's annualized forest inventory system. Previous forest inventories, completed in 1948 (McGuire andWray 1952), 1965 (Kingsley andBarnard 1968), 1973 (Kingsley 1977, Frieswyk andMalley 1985), 1983 Malley 1985, Frieswyk andWidmann 2000), and 1997 (Frieswyk and Widmann 2000), were collected under a different inventory system in which states were inventoried periodically with no measurements made between inventories. The annualized system was implemented to provide updated forest inventory information every year based on a 5year cycle.…”

Section: Data Sources and Techniquesmentioning

confidence: 99%

“…Error bars represent 68% confi dence interval around estimate. Vermont, 1948, 1966, 1973, 1997. (Grand Isle County not reported in 1966or 1973inventories and combined with Franklin County in 1983and 1997 Projection: Vermont State Plane, NAD83.…”

Section: What We Foundmentioning

confidence: 99%

Vermont's Forests 2007

Morin¹,

Barnett²,

Brand³

et al. 2011

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The fi rst full annual inventory of Vermont's forests reports more than 4.5 million acres of forest land with an average volume of more than 2,200 cubic feet per acre. Forest land is dominated by the maple/beech/ birch forest-type group, which occupies 70 percent of total forest land area. Sixty-three percent of forest land consists of large-diameter trees, 27 percent contains medium-diameter trees, and 9 percent contains small-diameter trees. The volume of growing stock on timberland has been rising since the 1980s and currently totals nearly 9 billion cubic feet. The average annual net growth of growing stock on timberland from 1997 to 2007 is approximately 180 million cubic feet per year. Additional information is presented on forest attributes, land use change, carbon, timber products, and forest health. Detailed information on forest inventory methods and data quality estimates is included in a DVD at the back of the report. Tables of population estimates and a glossary are also included.

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“…The study area included 40 sample data points within Lamoille County, Vermont, from the 1982-1983 U.S. Forest Service's Resource Evaluation Survey of Vermont (Frieswyk and Malley 1985). Lamoille County was chosen in part because of the number of sample points selected there, which appeared large enough to present various boundary conditions but small enough that any boundary effects would not be overshadowed by an unaffected interior region.…”

Section: A Comparative Studymentioning

confidence: 99%

Boundary Problem for Triangulated Irregular Networks

Bower¹,

Newton²

1993

Cartography and Geographic Information Systems

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The triangulated irregular network (TIN) is a data structure commonly used for approximating continuous surfaces and for analyzing point data sets. Unfortunately, the locations of the data points may limit the areal extent of a TIN such thnt some regions within a study area's boundary are outside the scope of the analysis. The use of pseudopoints generated outside the boundary is recommended as a method for increasing the extent of a TIN. Criteria for selecting pseudopoints and for assigning values to them are discussed. This comparative study demonstrates several variations of the general method.

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Forest statistics for Vermont, 1973 and 1983 /

Cited by 12 publications

References 0 publications

Evidence from a Landscape Population Model of the Importance of Early Successional Habitat to the American Redstart

Evidence from a Landscape Population Model of the Importance of Early Successional Habitat to the American Redstart

Vermont's Forests 2007

Boundary Problem for Triangulated Irregular Networks

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