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Filter Total Items: 493
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Year Published: 2013

ʻŌhiʻa Lehua rainforest: born among Hawaiian volcanoes, evolved in isolation: the story of a dynamic ecosystem with relevance to forests worldwide

In the early 1970s, a multidisciplinary team of forest biologists began a study of Hawaiian ecosystems under the International Biological Program (IBP). Research focus was on the intact native ecosystems in and around Hawai'i Volcanoes National Park, in particular the ʻŌhiʻa Lehua rainforest. Patches of dead ʻŌhiʻa stands had been reported from...

Mueller-Dombois, Dieter; Jacobi, James D.; Boehmer, Hans Juergen; Price, Jonathan P.
ʻŌhiʻa Lehua rainforest: born among Hawaiian volcanoes, evolved in isolation: the story of a dynamic ecosystem with relevance to forests worldwide; 2013; Book; Mueller-Dombois, Dieter; Jacobi, James D.; Boehmer, Hans Juergen, Price, Jonathan P.

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Year Published: 2013

Distribution of invasive ants and methods for their control in Hawai'i Volcanoes National Park

The first invasive ants were detected in Hawai`i Volcanoes National Park (HAVO) more than 80 years ago. Ecological impacts of these ants are largely unknown, but studies in Hawai`i and elsewhere increasingly show that invasive ants can reduce abundance and diversity of native arthropod communities as well as disrupt pollination and food webs....

Peck, Robert W.; Banko, Paul C.; Snook, Kirsten; Euaparadorn, Melody

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Year Published: 2013

Population genetic structure of rare and endangered plants using molecular markers

This study was initiated to assess the levels of genetic diversity and differentiation in the remaining populations of Phyllostegia stachyoides and Melicope zahlbruckneri in Hawai`i Volcanoes National Park and determine the extent of gene flow to identify genetically distinct individuals or groups for conservation purposes. Thirty-six Amplified...

Raji, Jennifer; Atkinson, Carter T.

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Year Published: 2013

Dynamics of seabird colonies vulnerable to sea-level rise at French Frigate Shoals, Hawai`i

Globally, seabirds are vulnerable to anthropogenic threats both at sea and on land. Seabirds typically nest colonially and show strong site fidelity; therefore, conservation strategies could benefit from an understanding of the population dynamics and vulnerability of breeding colonies to climate change. More than 350 atolls exist across the...

Reynolds, Michelle H.; Courtot, Karen N.; Krause, Crystal M.; Seavy, Nathaniel E.; Hartzell, Paula; Hatfield, Jeff S.
Dynamics of seabird colonies vulnerable to sea-level rise at French Frigate Shoals, Hawai`i; 2013; Other Government Series; HCSU-037; Reynolds, Michelle H.; Courtot, Karen N.; Krause, Crystal M.; Seavy, Nathaniel E.; Hartzell, Paula; Hatfield, Jeff S.

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Year Published: 2013

Climate-associated population declines reverse recovery and threaten future of an iconic high-elevation plant

Although climate change is predicted to place mountain-top and other narrowly endemic species at severe risk of extinction, the ecological processes involved in such extinctions are still poorly resolved. In addition, much of this biodiversity loss will likely go unobserved, and therefore largely unappreciated. The Haleakalā silversword is...

Krushelnycky, Paul D.; Loope, Lloyd L.; Giambelluca, Thomas W.; Starr, Forest; Starr, Kim; Drake, Donald R.; Taylor, Andrew D.; Robichaux, Robert H.
Climate-associated population declines reverse recovery and threaten future of an iconic high-elevation plant; 2013; Article; Journal; Global Change Biology; Krushelnycky, Paul D.; Loope, Lloyd L.; Giambelluca, Thomas W.; Starr, Forest ; Starr, Kim ; Drake, Donald R.; Taylor, Andrew D.; Robichaux, Robert H.

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Year Published: 2013

Tamarix as wildlife habitat

Sher, Anna; Quigley, Martin F.; Bateman, Heather L.; Paxton, Eben H.; Longland, William S.
Tamarix as wildlife habitat; 2013; Book chapter; Book; Tamarix: a case study of ecological change in the American West; Bateman, Heather L.; Paxton, Eben H.; Longland, William S.

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Year Published: 2013

Abundance and distribution of feral pigs at Hakalau Forest National Wildlife Refuge, 2010-2013

The Hakalau Forest Unit of the Big Island National Wildlife Refuge Complex has intensively managed feral pigs (Sus scrofa) and monitored feral pig presence with surveys of all managed areas since 1988. Results of all available data regarding pig management activities through 2004 were compiled and analyzed, but no further analyses had been...

Hess, Steven C.; Leopold, Christina R.; Kendall, Steven J.
Abundance and distribution of feral pigs at Hakalau Forest National Wildlife Refuge, 2010-2013; 2013; Organization Series; HCSU-045; Hess, Steven C.; Leopold, Christina R.; Kendall, Steve J.

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Year Published: 2013

Juvenile i`iwi detected in lower elevations of Hawaii Volcanoes National Park

The Hawaiian islands are home to a diverse array of plants and animals found nowhere else on Earth. Among the most famous of these are the spectacular Hawaiian honeycreepers, a group that evolved from a single flock of ancestral finches into at least 54 unique species. Unfortunately, the same isolation that fostered such dramatic...

Gaudioso, Jacqueline M.; Beck, Angela T.
Juvenile i`iwi detected in lower elevations of Hawaii Volcanoes National Park; 2013; Other Government Series; NPS web page; Gaudioso, Jacqueline M.; Beck, Angela T.

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Year Published: 2013

Home range and use of habitat of western yellow-billed cuckoos on the middle Rio Grande, New Mexico

The western yellow-billed cuckoo (Coccyzus americanus occidentalis) is a Distinct Population Segment that has been proposed for listing under the Endangered Species Act, yet very little is known about its spatial use on the breeding grounds. We implemented a study, using radio telemetry, of home range and use of habitat for breeding cuckoos along...

Sechrist, Juddson; Ahlers, Darrell; Potak Zehfuss, Katherine; Doster, Robert; Paxton, Eben H.; Ryan, Vicky M.
Sechrist, J., D. Ahlers, K. Zehfuss, R. Doster, E.H. Paxton, and V. Johanson. 2013. Home Range and Use of Habitat of Western Yellow-Billed Cuckoos On the Middle Rio Grande, New Mexico. Southwestern Naturalist 58:411-419

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Year Published: 2013

Pacific Island landbird monitoring annual report, Haleakalā National Park, 2012

Haleakalā National Park (HALE) was surveyed for landbirds and habitat characteristics from March 20 through July 26, 2012. This information provides data in the time-series of landbird monitoring for long-term trends in forest bird distribution, density, and abundance. The Kīpahulu District of eastern Haleakalā Volcano was surveyed using point-...

Judge, Seth W.; Camp, Richard J.; Hart, Patrick J.
Pacific Island landbird monitoring annual report, Haleakalā National Park, 2012; 2013; Other Government Series; NPS/PACN/NRTR—2013/740; Judge, Seth W.; Camp, Richard J.; Hart, Patrick J.

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Year Published: 2013

Invasive species management restores a plant-pollinator mutualism in Hawaii

1.The management and removal of invasive species may give rise to unanticipated changes in plant–pollinator mutualisms because they can alter the composition and functioning of plant–pollinator interactions in a variety of ways. To utilize a functional approach for invasive species management, we examined the restoration of plant–pollinator...

Hanna, Cause; Foote, David; Kremen, Claire
Invasive species management restores a plant-pollinator mutualism in Hawaii; 2013; Article; Journal; Journal of Applied Ecology; Hanna, Cause; Foote, David; Kremen, Claire

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Year Published: 2013

Freshwater and drought on Pacific Islands

Izuka, Scot K.; Keener, Victoria
Freshwater and drought on Pacific Islands; 2013; Book chapter; Book; Climate Change and Pacific Islands: Indicators and Impacts: Report for the 2012 Pacific Islands Regional Climate Assessment; Scot K Izuka; Keener, Victoria

Our scientists in the Northwest Region conduct impartial, multi- and interdisciplinary research and monitoring on a large range of natural-resource issues that impact the quality of life of citizens of the Northwest states of Idaho, Montana, Oregon, Washington, and Wyoming.

Filter Total Items: 301
July 19, 2014

L1 West Transect – 2014

Permanent Site: L1 West Transect; Depth: 11.0 Meters (36.2 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.13957527,-123.59427175; Site Description: This transect is medium depth. The first 20 meters contains scattered boulders (0:18 seconds). Where there are no boulders, substrate is still

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View along shore. Smooth blue water with bands of snow-covered ice (left) beside dark bluffs topped with brown grass (right).
June 15, 2014

North shore of Barter Island on Alaska’s Arctic coast

Photo from a time-lapse camera looking eastward along the north shore of Barter Island on Alaska’s Arctic coast, June 15, 2014. View the complete time-lapse sequence to see how the coastal bluffs and beach changed during a single summer.

Image of Blake Hossack
December 31, 2013

Image of Blake Hossack

USGS scientist Blake Hossack demonstrates swabbing the skin of a boreal toad to detect the amphibian chytrid fungus, to the Conservation Ecology class from the University of Montana.

Sampling for invasive northern pike in south central Alaska.
December 31, 2013

Sampling for invasive northern pike in south central Alaska.

Sampling for invasive northern pike in south central Alaska.

September 10, 2013

F2 East Transect – 2013

Permanent Site: F2 East Transect; Depth: 11.7 Meters (38.3 Feet); Distance from river mouth: 1.5 Kilometers (0.9 Miles) east; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.15672004,-123.54969397; Site Description: This video was taken in September, about 40 days after the video on the west transect (F2 West Transect – 2013). Substrate is mainly gravel mixed

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Tanner Creek outfall
September 5, 2013

Tanner Creek

Tanner Creek outfall delivers stormwater runoff with insecticides to Tanner Creek, tributary of the Willamette River

August 30, 2013

L1 East Transect – 2013

Permanent Site: L1 East Transect; Depth: 10.3 Meters (33.9 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.13957527,-123.59359993; Site Description: This transect is medium depth. Substrate is now mainly fine sediment/sand/mud covered in a layer of brown diatoms (0:09 seconds). Scattered

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August 30, 2013

L1 West Transect – 2013

Permanent Site: L1 West Transect; Depth: 11.2 Meters (36.9 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.13957527,-123.59427175; Site Description: This transect is medium depth. The first 20 meters contains scattered boulders (0:08 seconds). Where there are no boulders, substrate is now

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August 28, 2013

H2 West Transect – 2013

Permanent Site: H2 West Transect; Depth: 7.4 Meters (24.3 Feet); Distance from river mouth: 2.6 Kilometers (1.6 Miles) east; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.15008216,-123.53277857; Site Description: This site is medium to shallow depth. Substrate is mainly gravel with some sand, cobble and an occasional boulder and has not changed since dam

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August 28, 2013

H2 East Transect – 2013

Permanent Site: H2 East Transect; Depth: 8.0 Meters (26.3 Feet); Distance from river mouth: 2.6 Kilometers (1.6 Miles) east; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.15008216,-123.53210661; Site Description: This site is medium to shallow depth. Substrate is mainly gravel with some sand, cobble and an occasional boulder and has not changed since dam

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August 27, 2013

GP2 East Transect – 2013

Permanent Control Site: GP2 East Transect; Depth: 13.0 Meters (42.8 Feet); Distance from river mouth: 18.8 Kilometers (11.7 Miles) east; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.12781102,-123.31645664; Site Description: This site was established as the eastern control. Substrate is mainly a gravel sand mixture. A few large boulders are located off

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Our scientists in the Northwest Region conduct impartial, multi- and interdisciplinary research and monitoring on a large range of natural-resource issues that impact the quality of life of citizens of the Northwest states of Idaho, Montana, Oregon, Washington, and Wyoming.