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Filter Total Items: 493
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Year Published: 2013

Experimental reintroduction reveals novel life-history variation in Laysan Ducks (Anas laysanensis)

Subfossil remains indicate that the Laysan Duck (Anas laysanensis) formerly occurred throughout the Hawaiian archipelago, but for more than 150 years it has been confined to a single, small atoll in the northwestern chain, Laysan Island. In 2004–2005, 42 ducks were reintroduced from Laysan to Midway Atoll, where they exhibited variation in life...

Walters, Jeffrey R.; Reynolds, Michelle H.
Experimental reintroduction reveals novel life-history variation in Laysan Ducks (Anas laysanensis); 2013; Article; Journal; The Auk; Walters, Jeffrey R.; Reynolds, Michelle H.

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Year Published: 2013

Pacific Island landbird monitoring annual report, Hawaii Volcanoes National Park, tract group 1 and 2, 2010

In concordance with the stated role of the I&M Program, the objectives of this survey were to provide information for monitoring long-term trends in forest bird distribution, density, and abundance in HAVO. Ultimately, this information will help to inform and implement management actions to stabilize and/or increase bird populations.

Judge, S. W.; Gaudioso, J. M.; Hsu, B. H.; Camp, Richard J.; Hart, P. J.

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Year Published: 2013

Immunological markers for tolerance to avian malaria in Hawai`i `Amakihi: new tools for restoring native Hawaiian forest birds?

We evaluated three assays for non-specific or innate immune capacity to see if measurements were independent of malarial infection and capable of distinguishing malaria-tolerant, low-elevation Hawaiʽi ʽAmakihi from malaria-susceptible, high-elevation ʽAmakihi. ʽAmakihi were captured at Malama Ki Forest Reserve (20 m), Hakalau Forest National...

Atkinson, Carter T.; Paxton, Eben H.
Immunological markers for tolerance to avian malaria in Hawai`i `Amakihi: new tools for restoring native Hawaiian forest birds?; 2013; Other Government Series; HCSU-042; Atkinson, Carter T.; Paxton, Eben H.

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Year Published: 2013

Multi-scale habitat selection of the endangered Hawaiian Goose

After a severe population reduction during the mid-20th century, the endangered Hawaiian Goose (Branta sandvicensis), or Nēnē, has only recently re-established its seasonal movement patterns on Hawai‘i Island. Little is currently understood about its movements and habitat use during the nonbreeding season. The objectives of this research were to...

Leopold, Christina R.; Hess, Steven C.
Multi-scale habitat selection of the endangered Hawaiian Goose; 2013; Article; Journal; Condor; Leopold, Christina R; Hess, Steve

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Year Published: 2013

Abundance, distribution, and population trends of the iconic Hawaiian Honeycreeper, the ʻIʻiwi (Vestiaria coccinea) throughout the Hawaiian Islands

Naturalists in the 1800s described the ʻIʻiwi (Vestiaria coccinea) as one of the most abundant forest birds, detected in forested areas from sea level to tree line across all the major Hawaiian Islands. However, in the late 1800s, ʻIʻiwi began to disappear from low elevation forests, and by the mid-1900s, the species was largely absent from low-...

Paxton, Eben H.; Gorresen, P. Marcos; Camp, Richard J.
Abundance, distribution, and population trends of the iconic Hawaiian Honeycreeper, the ʻIʻiwi (Vestiaria coccinea) throughout the Hawaiian Islands; 2013; OFR; 2013-1150; Paxton, Eben H.; Gorresen, P. Marcos; Camp, Richard J.

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Year Published: 2013

Demographic variation, reintroduction, and persistence of an island duck (Anas laysanensis)

Population variation in life history can be important for predicting successful establishment and persistence of reintroduced populations of endangered species. The Laysan duck (Anas laysanensis) is an endangered bird native to the Hawaiian Archipelago that was extirpated from most islands after the introduction of mammalian predators. Laysan...

Reynolds, Michelle H.; Weiser, Emily; Jamieson, Ian; Hatfield, Jeffrey S.
Demographic variation, reintroduction, and persistence of an island duck (Anas laysanensis); 2013; Article; Journal; Journal of Wildlife Management; Reynolds, Michelle H.; Emily Weiser; Jamieson, Ian; Hatfield, Jeffrey S.

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Year Published: 2013

Modeling the colonization of Hawaii by hoary bats (Lasiurus cinereus)

The Hawaiian archipelago, the most isolated cluster of islands on Earth, has been colonized successfully twice by bats. The putative “lava tube bat” of Hawaii is extinct, whereas the Hawaiian Hoary Bat, Lasiurus cinereus semotus, survives as an endangered species. We conducted a three-stage analysis to identify conditions under which hoary bats...

Bonaccorso, Frank J.; McGuire, Liam P.
Modeling the colonization of Hawaii by hoary bats (Lasiurus cinereus); 2013; Book chapter; Book; Bat Evolution, Ecology, and Conservation; Bonaccorso, Frank J.; McGuire, Liam P.

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Year Published: 2013

A five-year study of Hawaiian hoary bat (Lasiurus cinereus semotus) occupancy on the island of Hawai`i

Using acoustic recordings of the vocalizations of the endangered Hawaiian hoary bat (Lasiurus cinereus semotus) collected over a five-year period (2007–2011) from 25 survey areas across the island of Hawai`i, we modeled the relationship between habitat attributes and bat occurrence. Our data support the conclusion that hoary bats concentrate in...

Gorressen, Marcos P.; Bonaccorso, Frank J.; Pinzari, Corinna A.; Todd, Christopher M.; Montoya-Aiona, Kristina; Brinck, Kevin W.
A five-year study of Hawaiian hoary bat (Lasiurus cinereus semotus) occupancy on the island of Hawai`i; 2013; Other Government Series; HCSU-041; Gorressen, Marcos P.; Bonaccorso, Frank J.; Pinzari, Corinna A.; Todd, Christopher M.; Montoya-Aiona, Kristina; Brinck, Kevin

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Year Published: 2013

Rebuilding after collapse: evidence for long-term cohort dynamics in the native Hawaiian rain forest

Questions: Do long-term observations in permanent plots confirm the conceptual model of Metrosideros polymorpha cohort dynamics as postulated in 1987? Do regeneration patterns occur independently of substrate age, i.e. of direct volcanic disturbance impact? Location: The windward mountain slopes of the younger Mauna Loa and the older Mauna Kea...

Boehmer, Hans Juergen; Wagner, Helene H.; Jacobi, James D.; Gerrish, Grant C.; Mueller-Dombois, Dieter
Rebuilding after collapse: evidence for long-term cohort dynamics in the native Hawaiian rain forest; 2013; Article; Journal; Journal of Vegetation Science; Boehmer, Hans Juergen; Wagner, Helene H.; Jacobi, James D.; Gerrish, Grant C.; Mueller-Dombois, Dieter

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Year Published: 2013

Vegetation map of the watersheds between Kawela and Kamalō Gulches, Island of Molokaʻi, Hawaiʻi

In this document we describe the methods and results of a project to produce a large-scale map of the dominant plant communities for an area of 5,118.5 hectares encompassing the Kawela and Kamalō watersheds on the island of Molokaʻi, Hawaiʻi, using digital image analysis of multi-spectral satellite imagery. Besides providing a base map of the area...

Jacobi, James D.; Ambagis, Stephen
Vegetation map of the watersheds between Kawela and Kamalō Gulches, Island of Molokaʻi, Hawaiʻi; 2013; SIR; 2013-5093; Jacobi, James D.; Ambagis, Stephen

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Year Published: 2013

Estimating hydraulic properties from tidal attenuation in the Northern Guam Lens Aquifer, territory of Guam, USA

Tidal-signal attenuations are analyzed to compute hydraulic diffusivities and estimate regional hydraulic conductivities of the Northern Guam Lens Aquifer, Territory of Guam (Pacific Ocean), USA. The results indicate a significant tidal-damping effect at the coastal boundary. Hydraulic diffusivities computed using a simple analytical solution for...

Rotzoll, Kolja; Gingerich, Stephen B.; Jenson, John W.; El-Kadi, Aly I.
Estimating hydraulic properties from tidal attenuation in the Northern Guam Lens Aquifer, territory of Guam, USA; 2013; Article; Journal; Hydrogeology Journal; Rotzoll, Kolja ; Gingerich, Stephen B.; Jenson, John W.; El-Kadi, Aly I.

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Year Published: 2013

Biology and impacts of Pacific island invasive species 9. Capra hircus, the feral goat, (Mammalia: Bovidae)

Domestic goats, Capra hircus, were intentionally introduced to numerous oceanic islands beginning in the sixteenth century. The remarkable ability of C. hircus to survive in a variety of conditions has enabled this animal to become feral and impact native ecosystems on islands throughout the world. Direct ecological impacts include consumption and...

Chynoweth, Mark W.; Litton, Creighton M.; Lepczyk, Christopher A.; Hess, Steve A.; Cordell, Susan
Biology and impacts of Pacific island invasive species 9. Capra hircus, the feral goat, (Mammalia: Bovidae); 2013; Article; Journal; Pacific Science; Chynoweth, Mark W.; Litton, Creighton M.; Lepczyk, Christopher A.; Hess, Steve A.; Cordell, Susan

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 23, 2014

C2 East Transect – 2014

Permanent Site: C2 East Transect; Depth: 16.3 Meters (Feet 53.6); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.147841,-123.57596074; Site Description: One of our deepest sites. Substrate is all muddy sand. Seaweed is absent. Woody debris is seen (0:05 0:28, 1:52 seconds). Featherduster tubeworms, mainly

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July 23, 2014

C1 West Transect – 2014

Permanent Site: C1 West Transect; Depth: Meters (Feet); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.14525225,-123.57361291; Site Description: Substrate is entirely sand. All seaweeds are absent. Fragments of drift seaweed and eelgrass are seen throughout entire video. Invertebrates are scarce and are

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July 23, 2014

C2 West Transect – 2014

Permanent Site: C2 West Transect; Depth: 16.8 Meters (Feet 55.2); Distance from river mouth: 0.7 Kilometers (0.5 Miles); Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.147841,-123.57663268; Site Description: One of our deepest sites. Substrate is all muddy sand. Seaweed is absent. Lots of woody debris is present (0:28, 1:52 seconds). Featherduster tubeworms,

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July 22, 2014

H2 West Transect – 2014

Permanent Site: H2 West Transect; Depth: 7.7 Meters (25.2 Feet); Distance from river mouth: 2.6 Kilometers (1.6 Miles) east; Pre/Post Dam Removal: 3 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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July 22, 2014

H2 East Transect – 2014

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: 3 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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July 22, 2014

J1 West Transect – 2014

Permanent Site: J1 West Transect; Depth: 9.6 Meters (31.5 Feet); Distance from river mouth: 6.6 Kilometers (4.1 Miles) east; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.13607725,-123.48002186; Site Description: This site is medium depth. Substrates is mainly a gravel/sand mixture. Seaweed density is still greatly decreased. Three species of brown seaweed

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July 21, 2014

A1 West Transect – 2014

Permanent Site: A1 West Transect; Depth: 8.6 Meters (28.3 Feet); Distance from river mouth: 1.9 Kilometers (1.2 Miles) West; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.13870775, -123.586203; Site Description: Transect is in eastern part of Freshwater Bay. Sediment is primarily sand/sandy mud with patches of boulders. Seaweeds are absent this year. Feather

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July 21, 2014

4SP1 West Transect – 2014

Permanent Site: 4SP1 - West Transect; Depth: 6.5 Meters (21.2 Feet); Distance from river mouth: 0.8 Kilometers (0.5 Miles) East; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.15257, -123.557376; Site Description: The site has converted from gravel/cobble substrate to sand. Seaweed is completely absent. 
 

July 21, 2014

A1 East Transect – 2014

Permanent Site: A1 East Transect; Depth: 8.2 Meters (26.9 Feet); Distance from river mouth: 1.8 Kilometers (1.1 Miles) West; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.13870775, -123.5855312; Site Description: Transect is in eastern part of Freshwater Bay. Sediment is primarily sand/sandy mud. Previous small boulders appear to be buried. Seaweeds are

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July 21, 2014

4SP1 East Transect – 2014

Permanent Site: 4SP1 - East Transect; Depth: 6.5 Meters (21.2 Feet); Distance from river mouth: 0.8 Kilometers (0.5 Miles) East; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.15257, -123.556704; Site Description: The site has converted from gravel/cobble substrate to sand. Seaweed is completely absent. Dungeness crabs are seen regularly (0:06 seconds) as

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July 20, 2014

K1 East Transect – 2014 - YouTube

Permanent Site: K1 East Transect; Depth: 6.6 Meters (21.8 Feet); Distance from river mouth: 4.5 Kilometers (2.8 Miles) east; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.13592923,-123.5101581; Site Description: Visibility and surge was bad on this date so video is of poor quality. This is a shallow site. Sediment is a gravel/sand mixture. Seaweed was sparse

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July 19, 2014

L1 East Transect – 2014

Permanent Site: L1 East Transect; Depth: 11.3 Meters (37.1 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,-123.59359993; Site Description: This transect is medium depth. Substrate is still mainly fine sediment/sand/mud with a few scattered boulders. Seaweed is gone except small reds (

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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.