Zobrazeno 1 - 5
of 5
pro vyhledávání: '"Doug Helmers"'
Autor:
Wayne E Thogmartin, Laura López-Hoffman, Jason Rohweder, Jay Diffendorfer, Ryan Drum, Darius Semmens, Scott Black, Iris Caldwell, Donita Cotter, Pauline Drobney, Laura L Jackson, Michael Gale, Doug Helmers, Steve Hilburger, Elizabeth Howard, Karen Oberhauser, John Pleasants, Brice Semmens, Orley Taylor, Patrick Ward, Jake F Weltzin, Ruscena Wiederholt
Publikováno v:
Environmental Research Letters, Vol 12, Iss 7, p 074005 (2017)
The eastern migratory population of monarch butterflies ( Danaus plexippus plexippus ) has declined by >80% within the last two decades. One possible cause of this decline is the loss of ≥1.3 billion stems of milkweed ( Asclepias spp.), which monar
Externí odkaz:
https://doaj.org/article/56928cd3f32f4a4c8117ec8272a91fc2
Autor:
Wayne King, Murray K. Laubhan, Leigh H. Fredrickson, Gary Pogue, Mickey E. Heitmeyer, Frank Nelson, Doug Helmers
Publikováno v:
Wetland Techniques ISBN: 9789400769069
The history of efforts to design and develop wetland sites is extensive and rich, especially in the United States. This chapter provides an annotated view of the current state of wetland design and recommends an approach to future efforts using “Hy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::269be0f942bcce04f101c3bf1a0822e1
https://doi.org/10.1007/978-94-007-6907-6_3
https://doi.org/10.1007/978-94-007-6907-6_3
Publikováno v:
Aquatic Ecology; Mar2000, Vol. 34 Issue 1, p63-76, 14p
Publikováno v:
Ibis; 1993, Vol. 135 Issue 3, p333-348, 16p
Autor:
James T. Anderson, Craig A. Davis
Wetlands serve many important functions and provide numerous ecological services such as clean water, wildlife habitat, nutrient reduction, and flood control. Wetland science is a relatively young discipline but is a rapidly growing field due to an e