Zobrazeno 1 - 10
of 17
pro vyhledávání: '"James M. Helfield"'
Publikováno v:
Frontiers in Ecology and Evolution, Vol 12 (2024)
Large dam removal can trigger changes to physical and biological processes that influence vegetation dynamics in former reservoirs, along river corridors downstream of former dams, and at a river’s terminus in deltas and estuaries. We present the f
Externí odkaz:
https://doaj.org/article/5ef813dcbaf84b9cb5607688d8fdfc27
Autor:
Joshua Chenoweth, Patrick B. Shafroth, Rebecca L. Brown, James M. Helfield, Jenise M. Bauman, Sara Cendejas-Zarelli, Chhaya M. Werner, Jarrett L. Schuster, Olivia A. Morgan
Publikováno v:
Frontiers in Ecology and Evolution, Vol 11 (2023)
Large dam removals are increasing in frequency and the response of natural and managed revegetation is a critical consideration for managed restoration of dewatered reservoir landscapes post dam removal. The removal of two large dams on the Elwha Riv
Externí odkaz:
https://doaj.org/article/65ad53625f454b6eb3f696ac4b01949c
Publikováno v:
Ecology. 99:2433-2441
As they return to spawn and die in their natal streams, anadromous, semelparous fishes such as Pacific salmon import marine-derived nutrients to otherwise nutrient-poor freshwater and riparian ecosystems. Diverse organisms exploit this resource, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da74679322845702d165f33c720df520
https://doi.org/10.1002/ecy.2453
https://doi.org/10.1002/ecy.2453
Autor:
Paul R. Sheppard, Dustin A. Gleaves, James M. Helfield, Deanne C. Drake, Jody R. Gerdts, Andrew G. Bunn
Publikováno v:
Dendrochronologia. 44:19-21
The ability to accurately measure interannual variability of the stable isotope of nitrogen, 15N, in tree rings could greatly improve understanding of marine-derived nitrogen delivery to terrestrial ecosystems, soil nitrogen dynamics, and the influen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19eeee1259f2813dc3aff3dbe3e283ca
https://doi.org/10.1016/j.dendro.2017.03.001
https://doi.org/10.1016/j.dendro.2017.03.001
Publikováno v:
Northwest Science. 85:15-29
Scheduled to begin in 2011, the removal of two dams on the Elwha River, Washington, will be one of the largest dam removal and river restoration projects undertaken in the United States. One challenge associated with this project is to understand how
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe97d590454397a1ecb11fbb64126c7b
https://doi.org/10.3955/046.085.0102
https://doi.org/10.3955/046.085.0102
Publikováno v:
Ecological Applications. 17:840-851
Fluvial processes such as flooding and sediment deposition play a crucial role in structuring riparian plant communities. In rivers throughout the world, these processes have been altered by channelization and other anthropogenic stresses. Yet despit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc4ea61f1bb4d038b6a95fc63b5c73ca
https://doi.org/10.1890/06-0343
https://doi.org/10.1890/06-0343
Autor:
Robert J. Naiman, James M. Helfield
Publikováno v:
Ecosystems. 9:167-180
The term “keystone species” is used to describe organisms that exert a disproportionately important influence on the ecosystems in which they live. Analogous concepts such as “keystone mutualism” and “mobile links” illustrate how, in many
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df741abe067186fb31e6293ccdc0501c
https://doi.org/10.1007/s10021-004-0063-5
https://doi.org/10.1007/s10021-004-0063-5
Autor:
Daniel Palm, Niclas Hjerdt, Roland Jansson, Fabio Lepori, Christer Nilsson, James M. Helfield, Hans Lundqvist, Erik Törnlund, Johan Östergren, Björn Malmqvist, Eva Brännäs
Publikováno v:
Ecosystems. 8:779-800
Log floating in the 19th to mid 20th centuries has profoundly changed the environmental conditions in many northern river systems of the world. Regulation of flow by dams, straightening and narrowing of channels by various piers and wing dams, and ho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e4c7da28cf85e45dd73ea7daad884e8
https://doi.org/10.1007/s10021-005-0030-9
https://doi.org/10.1007/s10021-005-0030-9
Publikováno v:
Ecology. 83:2971-2977
Decision-makers concerned with salmon or their stream habitats are faced with many persistent, difficult questions including: how large and variable were these populations before European settlement? Here, we examine the feasibility of reconstructing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bf9d38fd4d575d74affc361a84eae42
https://doi.org/10.1890/0012-9658(2002)083[2971:rsaira]2.0.co
https://doi.org/10.1890/0012-9658(2002)083[2971:rsaira]2.0.co
Publikováno v:
Ecosystems. 5:399-417
Pacific salmon (Oncorhynchus spp.) accumulate substantial nutrients in their bodies as they grow to adulthood at sea. These nutrients are carried to predominantly oligotrophic lakes and streams, where they are released during and after spawning. Rese
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7880b45679c7f9aac6755e8caf5941ff
https://doi.org/10.1007/s10021-001-0083-3
https://doi.org/10.1007/s10021-001-0083-3