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Displaying 10,641 - 10,650 of 65,202 Publications- We discuss a recent paper which evaluated the hydrologic changes resulting from a pond-and-plug meadow restoration project in the Sierra Nevada Mountains of California. In the study, measurements of streamflow into and out of the meadow suggested late-summer baseflow increased as much as five-fold when compared with prerestoration conditions. However, the volume of streamflow attributed to the restored meadow (49,000–96,000 m3 over four months) would require that 2.5–4.8 m of saturated meadow soils drain during summer months. The groundwater data from this meadow record only 0.45 m of...AuthorsCaroline S. Nash, Gordon Grant, John S. Selker, Steven M. WondzellSourceJAWRA Journal of the American Water Resources Association. 50(3): 2657-2660.Year2019
- Dense rhizomatous herbaceous ferns such as hay-scented fern (Dennstaedtia punctilobula) and New York fern (Thelypteris noveboracensis), graminoids such as bearded shorthusk (Brachelytrum erectum), Danthonia spp., and Carex sp. ground cover, and woody understories of striped maple (Acer pensylvanicum), American beech (Fagus grandifolia), and sweet birch (Betula lenta) are found throughout the Allegheny Plateau region and beyond (Allegheny National Forest 1995, Horsley 1991). Considerable evidence suggests these ground cover layers are caused by long-term browsing by overabundant white-tailed...AuthorsTodd RistauSourceIn: Stout, Susan L., ed. SILVAH: 50 years of science-management cooperation. Proceedings of the Allegheny Society of American Foresters training session; 2017 Sept. 20-22; Clarion, PA. Gen. Tech. Rep. NRS-P-186. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 44-55.Year2019
- I came to work at the Forestry Sciences Laboratory in 1973, about 10 years after harvest cutting had begun in the maturing second-growth Allegheny hardwood forest. Clearcutting had been selected as the forest regeneration technique because it seemed to have worked well in the turn of the 20th century harvests on the Allegheny Plateau. But at this time, only about half the stands regenerated to desirable species; the other half regenerated to hay-scented fern (Dennstaedtia punctilobula), New York fern (Thelypteris noveboracensis), grasses and sedges, or to shade-tolerant understory trees...AuthorsStephen HorsleySourceIn: Stout, Susan L., ed. SILVAH: 50 years of science-management cooperation. Proceedings of the Allegheny Society of American Foresters training session; 2017 Sept. 20-22; Clarion, PA. Gen. Tech. Rep. NRS-P-186. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 37-43.Year2019
- Freshwater migratory shrimp in Puerto Rico depend on watershed connectivity, from stream headwaters to the ocean, to complete their life cycle. Moreover, shrimp populations in different watersheds are known to be connected in an island‐wide metapopulation. However, low‐head dams paired with water intakes on streams draining the El Yunque National Forest (EYNF) reduce streamflow. Here, we examine the cumulative effects of low‐head dams on shrimp habitat connectivity over 37 years across seven EYNF watersheds. We calculate total and refugia habitat connectivity (where refugia habitat is...AuthorsJessica Chappell, S. Kyle McKay, Mary C. Freeman, Catherine M. PringleKeywordsSourceRiver Research and ApplicationsYear2019
- We meet few people in our lives who command unblemished lifelong respect and affection based on both their scientific accomplishments and their admirable personal qualities, and it is with profound sorrow that we recognize the passing of someone with these attributes, one of the most outstanding individuals in the tribe of field ornithologists— James Warren Wiley.AuthorsNoel F R. Snyder, Herbert Raffaele, Arturo Kirkconnell, Joseph M. Wunderle Jr.SourceThe AukYear2019
- We report a 6-year study of an irruptive invasion of emerald ash borer (EAB) into a 36-yearold comparison of 60 green ash (Fraxinus pennsylvanica Marsh.) and 5 white ash (F. americana L.) populations. As the infestation progressed, annual measures of EAB injury (density of adult emergence holes on the trunk, crown condition, and mortality) were significantly influenced by genetic effects (population and in some instances family within population), site quality (field blocks), and neighborhood (contagion effects over distances of 5–13 m). At the last measurement, 99% of green ash trees and...AuthorsKim C. Steiner, Lake E. Graboski, Kathleen Knight, Jennifer Koch, Mary E. MasonKeywordsSourceBiological InvasionsYear2019
- Several upcoming satellite missions have core science requirements to produce data for accurate forest aboveground biomass mapping. Largely because of these mission datasets, the number of available biomass products is expected to greatly increase over the coming decade. Despite the recognized importance of biomass mapping for a wide range of science, policy and management applications, there remains no community accepted standard for satellite-based biomass map validation. The Committee on Earth Observing Satellites (CEOS) is developing a protocol to fill this need in advance of the next...AuthorsL. Duncanson, J. Armston, M. Disney, V. Avitabile, N. Barbier, K. Calders, S. Carter, J. Chave, M. Herold, T.W. Crowther, M. Falkowski, J.R. Kellner, N. Labrière, R. Lucas, N. MacBean, R.E. McRoberts, V. Meyer, E. Næsset, J.E. Nickeson, K.I. Paul, O.L. Phillips, M. Réjou-Méchain, M. Román, S. Roxburgh, S. Saatchi, D. Schepaschenko, K. Scipal, P.R. Siqueira, A. Whitehurst, M. WilliamsKeywordsSourceSurveys in GeophysicsYear2019
- In this article we respond to a recent paper in which Rosenberg (2019) suggested that red tree voles (Arborimus longicaudus) were just as common as western redbacked voles (Myodes californicus) and implied that federal management agencies should consider dispensing with field surveys of red tree voles in favor of an unspecified adaptive management approach. Our primary purpose in writing this response is not to debate how management agencies should manage red tree voles. Our objective is to demonstrate that Rosenberg’s (2019) attempt to compare the distribution and relative abundance of...AuthorsEric D. Forsman, James K. Swingle, Damon B. Lesmeister, Chad A. Marks-Fife, Mark A. LinnellKeywordsSourceForest Ecology and Management. 451: 117258-.Year2019
- During the early decades of the 20th century the confluence of two major alterations to forest and wildlife population dynamics occurred in the northern tier of Pennsylvania; namely, the near-complete harvesting and resultant regrowth of all forests in the region coupled with the extirpation and subsequent reintroduction of white-tailed deer (Odocoileus virginianus) (Redding 1995). In the ensuing years, abundant early-successional habitat, the absence of apex predators such as wolves and mountain lions, and lax game management policies resulted in a population explosion of deer to levels...AuthorsAlejandro A. Royo, Susan L. StoutSourceIn: Stout, Susan L., ed. SILVAH: 50 years of science-management cooperation. Proceedings of the Allegheny Society of American Foresters training session; 2017 Sept. 20-22; Clarion, PA. Gen. Tech. Rep. NRS-P-186. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 26-36.Year2019
- Transpiration in humid tropical forests modulates the global water cycle and is a key driver of climate regulation. Yet, our understanding of how tropical trees regulate sap flux in response to climate variability remains elusive. With a progressively warming climate, atmospheric evaporative demand [i.e., vapor pressure deficit (VPD)] will be increasingly important for plant functioning, becoming the major control of plant water use in the twenty-first century. Using measurements in 34 tree species at seven sites across a precipitation gradient in the neotropics, we determined how the...AuthorsCharlotte Grossiord, Bradley Christoffersen, Aura M. Alonso-Rodríguez, Kristina Anderson-Teixeira, Heidi Asbjornsen, Luiza Maria T. Aparecido, Z. Carter Berry, Christopher Baraloto, Damien Bonal, Isaac Borrego, Benoit Burban, Jeffrey Q. Chambers, Danielle S. Christianson, Matteo Detto, Boris Faybishenko, Clarissa G. Fontes, Claire Fortunel, Bruno O. Gimenez, Kolby J. Jardine, Lara Kueppers, Gretchen R. Miller, Georgianne W. Moore, Robinson Negron-Juarez, Clément Stahl, Nathan G. Swenson, Volodymyr Trotsiuk, Charu Varadharajan, Jeffrey M. Warren, Brett T. Wolfe, Liang Wei, Tana E. Wood, Chonggang Xu, Nate G. McDowellSourceOecologiaYear2019