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Filter Total Items: 495
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Year Published: 2014

Competitive impacts of an invasive nectar thief on plant-pollinator mutualisms

Plant–pollinator mutualisms are disrupted by a variety of competitive interactions between introduced and native floral visitors. The invasive western yellowjacket wasp, Vespula pensylvanica, is an aggressive nectar thief of the dominant endemic Hawaiian tree species, Metrosideros polymorpha. We conducted a large-scale, multiyear manipulative...

Hanna, Cause; Foote, David; Kremen, Claire
Competitive impacts of an invasive nectar thief on plant-pollinator mutualisms; 2014; Article; Journal; Ecology; Hanna, Cause; Foote, David; Kremen, Claire

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Year Published: 2014

Developing tools to eradicate ecologically destructive ants on Rose Atoll: effectiveness and attractiveness of formicidal baits

A key factor contributing to the decline in the population of Pisonia grandis on Rose Atoll is an infestation of the non-native scale, Pulvinaria urbicola (Homoptera: Coccidae). Ants, in facultative relationships with scale insects, may facilitate scale population growth and increase their effect on plant hosts. Three ant species found on Rose...

Peck, Robert; Banko, Paul; Pendleton, Frank
Developing tools to eradicate ecologically destructive ants on Rose Atoll: effectiveness and attractiveness of formicidal baits; 2014; Other Government Series; TR HCSU-052; Hawaii Cooperative Studies Unit Technical Report; Peck, Robert; Banko, Paul; Pendleton, Frank

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Year Published: 2014

Arthropod community structure on bark of koa (Acacia koa) and ʻōhiʻā (Metrosideros polymorpha) at Hakalau Forest National Wildlife Refuge, Hawaiʻi Island, Hawaiʻi

The arthropod community associated with tree bark contains a wide variety of taxa but is poorly described, particularly in Hawaiʽi. Our overall goals were to evaluate the abundance of arthropods available to foraging birds and how variation in bark substrates may contribute to arthropod distributions in native forests. Our study aimed to identify...

Peck, Robert W.; Banko, Paul C.; Stelmach, Matt
Arthropod community structure on bark of koa (Acacia koa) and ʻōhiʻā (Metrosideros polymorpha) at Hakalau Forest National Wildlife Refuge, Hawaiʻi Island, Hawaiʻi; 2014; Other Government Series; TR HCSU-050; Hawai‘i Cooperative Studies Unit Technical Report; Peck, Robert W.; Banko, Paul C.; Stelmach, Matt

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Year Published: 2014

El Niño-Southern Oscillation is linked to decreased energetic condition in long-distance migrants

Predicting how migratory animals respond to changing climatic conditions requires knowledge of how climatic events affect each phase of the annual cycle and how those effects carry-over to subsequent phases. We utilized a 17-year migration dataset to examine how El Niño-Southern Oscillation climatic events in geographically different...

Paxton, Kristina L.; Cohen, Emily B.; Paxton, Eben H.; Németh, Zoltan; Moore, Frank R.
Paxton, K.L., E.B. Cohen, E.H. Paxton, Z. Németh, and F.R. Moore. 2014. El Niño-Southern Oscillation Is Linked to Decreased Energetic Condition in Long-Distance Migrants. PLoS One, 9(5): e95383. doi: 10.1371/journal.pone.0095383

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Year Published: 2014

Hawaiian hoary bat occupancy at Kaloko-Honokōhau National Historical Park

Hawaiian hoary bat (Lasiurus cinereus semotus) vocalizations were recorded using Anabat SD1 and Song Meter SM2Bat ultrasonic recorders at four monitoring stations in Kaloko-Honokōhau National Historical Park on the island of Hawai‘i. We hypothesize that echolocation call events are more numerous during the reproductive season of this bat. Bat...

Bonaccorso, Frank J.; Pinzari, Corina; Montoya-Aiona, Kristina
Hawaiian hoary bat occupancy at Kaloko-Honokōhau National Historical Park; 2014; Other Government Series; TR HCSU-051; Hawaii Cooperative Studies Unit Technical Report; Bonaccorso, Frank; Pinzari, Corina; Montoya-Aiona, Kristina

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Year Published: 2014

Strength of evidence for the effects of feral cats on insular wildlife: The Club Med Syndrome Part II

Various types of evidence have been promulgated as proof for the effects of feral cats on wildlife, typically including numerous studies on predation inferred from diet, mortality attributed to pathogens, and photographic or videographic documentation. The strength of these types of evidence is often short of conclusive. For example, studies of...

Hess, Steve C.
Hess, S.C. 2014. Strength of Evidence for the Effects of Feral Cats on Insular Wildlife: The Club Med Syndrome Part II. In: Proceedings of the 26th Vertebrate Pest Conference, ed. Timm, R.M. and J.M. O'Brien. University of California, Davis, pp. 211-216.

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Year Published: 2014

Monitoring Hawaiian waterbirds: evaluation of sampling methods to produce reliable estimates

We conducted field trials to assess several different methods of estimating the abundance of four endangered Hawaiian waterbirds: the Hawaiian duck (Anas wyvilliana), Hawaiian coot (Fulica alai), Hawaiian common moorhen (Gallinula chloropus sandvicensis) and Hawaiian stilt (Himantopus mexicanus knudseni). At two sites on Oʽahu, James Campbell...

Camp, Richard J.; Brinck, Kevin W.; Paxton, Eben H.; Leopold, Christina
Monitoring Hawaiian waterbirds: evaluation of sampling methods to produce reliable estimates; 2014; Other Government Series; TR HCSU-049; Hawaii Cooperative Studies Unit Technical Report; Camp, Richard J.; Brinck, Kevin W.; Paxton, Eben H.; Leopold, Christina

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Year Published: 2014

How much land is needed for feral pig hunting in Hawai'i?

Hunting is often considered to be incompatible with conservation of native biota and watershed functions in Hawai'i. Management actions for conservation generally exclude large non-native mammals from natural areas, thereby reducing the amount of land area available for hunting activities and the maintenance of sustainable game populations. An...

Hess, Steven C.; Jacobi, James D.
Hess, S.C. and J.D. Jacobi. 2014. How much land is needed for feral pig hunting in Hawai'i? Pacific Conservation Biology, 20(1) 54-56.

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Year Published: 2014

Status of forest birds on Rota, Mariana Islands

The western Pacific island of Rota is the third largest human inhabited island in the Mariana archipelago, and is designated an Endemic Bird Area. Between 1982 and 2012, 12 point-transect distance sampling surveys were conducted to assess population status. Surveys did not consistently sample the entire island; thus, we used a ratio estimator to...

Camp, Richard J.; Brinck, Kevin W.; Gorresen, P. Marcos; Amidon, Fred A.; Radley, Paul M.; Berkowitz, S. Paul; Banko, Paul C.
Status of forest birds on Rota, Mariana Islands; 2014; Other Government Series; TR HCSU-048; Hawaii Cooperative Studies Unit Technical Report; Camp, Richard J.; Brinck, Kevin W.; Gorresen, P. Marcos; Amidon, Fred A.; Radley, Paul M.; Berkowitz, S. Paul; Banko, Paul C.

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Year Published: 2014

Changing climate and the altitudinal range of avian malaria in the Hawaiian Islands: an ongoing conservation crisis on the island of Kaua'i

Transmission of avian malaria in the Hawaiian Islands varies across altitudinal gradients and is greatest at elevations below 1500 m where both temperature and moisture are favorable for the sole mosquito vector, Culex quinquefasciatus, and extrinsic sporogonic development of the parasite, Plasmodium relictum. Potential consequences of global...

Atkinson, Carter T.; Utzurrum, Ruth B.; LaPointe, Dennis A.; Camp, Richard J.; Crampton, Lisa H.; Foster, Jeffrey T.; Giambelluca, Thomas W.
Changing climate and the altitudinal range of avian malaria in the Hawaiian Islands: an ongoing conservation crisis on the island of Kaua'i; 2014; Article; Journal; Global Change Biology; Atkinson, Carter T.; Utzurrum, Ruth B.; Lapointe, Dennis A.; Camp, Richard J.; Crampton, Lisa H.; Foster, Jeffrey T.; Giambelluca, Thomas W.

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Year Published: 2014

Colony social structure in native and invasive populations of the social wasp Vespula pensylvanica

Social insects rank among the most invasive of terrestrial species. The success of invasive social insects stems, in part, from the flexibility derived from their social behaviors. We used genetic markers to investigate if the social system of the invasive wasp, Vespula pensylvanica, differed in its introduced and native habitats in order to...

Hanna, Cause; Cook, Erin D.; Thompson, Ariel R.; Dare, Lyndzey E.; Palaski, Amanda L.; Foote, David; Goodisman, Michael A. D.
Hanna, C., E.D. Cook, A.R. Thompson, L.E. Dare, A.L. Palaski, D. Foote & M.A.D. Goodiman. 2014. Colony social structure in native and invasive populations of the social wasp Vespula pensylvanica. Biological Invasions 16(2):283-294.

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Year Published: 2014

Dry forest restoration and unassisted native tree seedling recruitment at Auwahi, Maui

Efforts to restore highly degraded but biologically significant forests draw from a limited toolbox. With less than 10% of their former distribution remaining, Hawaiian dry forests, though critically endangered, remain important biological and cultural refugia. At restoration onset (1997), vegetation of restoration and control areas of degraded...

Medeiros, Arthur C.; von Allmen, E. I.; Chimera, C.G.
Dry forest restoration and unassisted native tree seedling recruitment at Auwahi, Maui; 2014; Article; Journal; Pacific Science; Medeiros, Arthur C.; von Allmen, E. I.; Chimera, C. G.

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
Seining a heavily bullfrog populated side channel at Two Moon County Park in Billings, MT.
December 31, 2014

Capturing invasive American bullfrog tadpoles in the Yellowstone River floodplain.

Seining a heavily bullfrog populated side channel at Two Moon County Park in Billings, MT.

Pend Oreille River in winter
December 1, 2014

Pend Oreille River in winter

The Kalispel Tribe in northeastern Washington is located along the Pend Oreille River, home to culturally important, cold-water fish, such as bull trout and cutthroat trout. In an ongoing study, USGS researchers are helping to identify cold-water refuges and develop a protection and restoration framework that will inform Kalispel Tribe natural resource managers involved in

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Visitors at Glines Canyon East Abutment in Olympic National Park, the location of the Elwha River Restoration project.
October 31, 2014

Glines Canyon East Abutment

Visitors at Glines Canyon East Abutment in Olympic National Park, the location of the Elwha River Restoration project. Image available at Olympic National Park flickr site.

Looking out the mouth of Reynolds Glacier in Glacier National Park.
September 24, 2014

Looking out the mouth of Reynolds Glacier in Glacier National Park.

Looking out the mouth of Reynolds Glacier in Glacier National Park. Glacier National Park is iconic of the combined impacts of climate change and snow and ice loss – over 80 percent of the park’s glaciers have been lost since the mid-19th century.

August 17, 2014

A2 West Transect – 2014

Permanent Site: A2 West Transect; Depth: 12.6 Meters (Feet 41.5); Distance from river mouth: Kilometers 1.8 (1.1 Miles); Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.14130295, -123.5883331; Site Description: One of our deeper sites at over 40 feet. Sediment is primarily sand/sandy mud with scattered boulders. Seaweeds are absent except for a couple Agarum

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August 17, 2014

F2 West Transect – 2014

Permanent Site: F2 West Transect; Depth: 11.8 Meters (38.6 Feet); Distance from river mouth: 1.5 Kilometers (0.9 Miles) east; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.15672004,-123.55036603; Site Description: Substrate is mainly a gravel - cobble mixture with an occasional boulder. Some seaweed has returned. Larger reds are present (0:43, 0:59 seconds)

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August 17, 2014

A2 East Transect – 2014

Permanent Site: A2 East Transect; Depth: 12.6 Meters (Feet 41.5); Distance from river mouth: Kilometers 1.8 (1.1 Miles); Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.14130295, -123.58766124; Site Description: One of our deeper sites at over 40 feet. Sediment is primarily sand/sandy mud. Seaweeds are absent again this year. The sandy substrate is covered in

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August 17, 2014

F2 East Transect – 2014

Permanent Site: F2 East Transect; Depth: 11.9 Meters (39.1 Feet); Distance from river mouth: 1.5 Kilometers (0.9 Miles) east; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.15672004,-123.54969397; Site Description: Substrate is mainly a gravel - cobble mixture with an occasional boulder. Some seaweed has returned. Larger reds are present (0:33, 2:08 seconds)

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August 16, 2014

D2 West Transect – 2014

Permanent Site: D2 West Transect; Depth: 12.3 Meters (40.5 Feet); Distance from river mouth: 0.3 Kilometers (0.2 Miles); Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.15233001,-123.56896603; Site Description: This site is right off the mouth of the river. Substrate is mainly gravel with some sand and cobble. Woody debris is present (1:07 seconds). Seaweeds

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August 16, 2014

D2 East Transect – 2014

Permanent Site: D2 East Transect; Depth: 12.6 Meters (41.4 Feet); Distance from river mouth: 0.3 Kilometers (0.2 Miles); Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.15233001,-123.56829403; Site Description: This site is right off the mouth of the river. Substrate is mainly gravel with some sand and cobble. Woody debris is present (0:28 seconds). Seaweeds

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Hay pile gathered by an American pika.
August 12, 2014

American pika hay pile in talus.

A hay pile gathered by an American pika sits on a talus slope.  During summer pikas collect green mountain plants to make hay piles for winter food.

An American pika collects grass and flowers to stockpile its winter food supplies.
August 9, 2014

American pika collecting food.

An American pika collects grass and flowers to stockpile its winter food supplies.

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.