Mission Areas L2 Landing Page Tabs
On November 20, 2014, eight teams of fishery biologists from the U.S. Geological Survey (USGS), U.S. Fish and Wildlife Service (USFWS), Florida Fish and Wildlife Conservation Commission (FWC), U.S. National Park Service (NPS), and Florida International University (FIU) gathered for a one-day sampling event to collect non-native fishes from canals, ponds and ditches in Miami-Dade County, FL....
USGS scientists work to provide data to UC Davis researchers on health and growth of smelt population in Bay-Delta.
Scientists study habitats occupied by longfin smelt larvae to better understand their ecology and to inform water management operations, species management, and habitat restoration efforts.
Based on field research conducted during 2002-2009, the bobwhite population on the Babcock-Webb Wildlife Management Area (WMA) in Southwest Florida is incapable of supporting desired levels of sport harvest.
Habitat alteration and climate, when combined, are serious threats to amphibians and other wildlife. Habitat suitability models are being used to predict the responses of an amphibian community to hydrological and habitat restoration in the Greater Everglades Ecosystem.
The South Atlantic Landscape Conservation Cooperative (SALCC) has proposed natural resource indicators and associated targets for the marine ecosystem.
Scientists research the importance of abiotic versus biotic (food supply) habitat features as drivers of delta smelt abundance and distribution.
Coping with Invasive Alien Species and Environmental Stressors: Linking Behavioral Studies with Management for Anuran Amphibians
Climate change and invasive species are two key drivers of biodiversity loss. Knowing how amphibians respond to climate change and invasive species can greatly improve predictions of species' persistence in the face of these factors and can help guide resource managers and conservation biologists in developing strategies to manage for these encroaching disturbances.
Fire is a major driving force in determining the structure and composition of subtropical vegetation. Prescribed fire constitutes one of the most pervasive management actions influencing the restoration and maintenance of the Greater Everglades Ecosystem.
The southeastern United States is home to a variety of freshwater snails, mussels, crayfish, and fishes. USGS scientists are conducting systematic studies to better document the region's biodiversity.
Florida's springs are a source of cultural, recreational, and ecological importance. But land-use changes and increased demands for groundwater due to the state's growing population have led to widespread impairment of these unique ecosystems.
The decline of freshwater animals has resulted in an increase in the number of imperiled species and extinctions. USGS scientists use genetics to determine if these species truly are gone forever.
2011 Kiwikiu (Maui Parrotbill) and Maui `Alauahio abundance estimates and the effect of sampling effort on power to detect a trend
The Kiwikiu (Pseudonestor xanthophrys), also called the Maui Parrotbill, is an endangered, forest bird found only in high elevation, wet forest of the eastern portion of Maui Island. Recent surveys, conducted at five year intervals, have revealed wide variation in abundance estimates (Camp et al. 2009). Effective management and conservation...Brinck, Kevin W.; Camp, Richard J.; Gorresen, P. Marcos; Leonard, David L.; Mounce, Hanna L.; Iknayan, Kelly J.; Paxton, Eben H.
Developing accurate survey methods for estimating population sizes and trends of the critically endangered Nihoa Millerbird and Nihoa Finch.
This report describes the results of a comparative study of bird survey methods undertaken for the purpose of improving assessments of the conservation status for the two endemic passerines on the Island of Nihoa—Nihoa Millerbird (Sylviidae: Acrocephalus familiaris kingi) and Nihoa Finch (Fringilidae: Telespiza ultima; also referred herein...Gorresen, P. Marcos; Camp, Richard J.; Brinck, Kevin W.; Farmer, Chris
N2-fixing red alder indirectly accelerates ecosystem nitrogen cycling
Symbiotic N2-fixing tree species can accelerate ecosystem N dynamics through decomposition via direct pathways by producing readily decomposed leaf litter and increasing N supply to decomposers, as well as via indirect pathways by increasing tissue and detrital N in non-fixing vegetation. To evaluate the relative importance of these pathways, we...Perakis, Steven S.; Matkins, Joselin J.; Hibbs, David E.
Mapping plant species ranges in the Hawaiian Islands: developing a methodology and associated GIS layers
This report documents a methodology for projecting the geographic ranges of plant species in the Hawaiian Islands. The methodology consists primarily of the creation of several geographic information system (GIS) data layers depicting attributes related to the geographic ranges of plant species. The most important spatial-data layer generated here...Price, Jonathan P.; Jacobi, James D.; Gon, Samuel M.; Matsuwaki, Dwight; Mehrhoff, Loyal; Wagner, Warren; Lucas, Matthew; Rowe, Barbara
An economic approach to assessing import policies designed to prevent the arrival of invasive species: the case of Puccinia psidii in Hawai'i
Since its first documented introduction to Hawai‘i in 2005, the rust fungus Puccinia psidii has already severely damaged Syzygium jambos (Indian rose apple) trees and the federally endangered Eugenia koolauensis (nioi). Fortunately, the particular strain has yet to cause serious damage to Metrosideros polymorpha (‘ōhi‘a),...Burnett, Kimberly; D'Evelyn, Sean; Loope, Lloyd; Wada, Christopher A.
Bird populations on the Island of Tinian: persistence despite wholesale loss of native forests
Bird habitat on the island of Tinian, Mariana Islands, has been substantially altered, and only around 5% of the island has native forest today. The modern bird fauna is likely to be a subset of the original avifauna where only species tolerant to native forest loss and human disturbance have survived. Avian surveys were conducted on the island in...Camp, Richard J.; Amidon, Frederick A.; Marshall, Ann P.; Pratt, Thane K.
Diet and conservation implications of an invasive chameleon, Chamaeleo jacksonii (Squamata: Chamaeleonidae) in Hawaii
We summarize information on current distribution of the invasive lizard Chamaeleo jacksonii and predict its potential distribution in the Hawaiian Islands. Potential distribution maps are based on climate models developed from known localities in its native range and its Hawaiian range. We also present results of analysis of stomach contents of a...Kraus, Fred; Medeiros, Arthur; Preston, David; Jarnevich, Catherine S.; Rodda, Gordon H.
Ecology and conservation biology of avian malaria
Avian malaria is a worldwide mosquito-borne disease caused by Plasmodium parasites. These parasites occur in many avian species but primarily affect passerine birds that have not evolved with the parasite. Host pathogenicity, fitness, and population impacts are poorly understood. In contrast to continental species, introduced avian malaria poses a...LaPointe, Dennis A.; Atkinson, Carter T.; Samuel, Michael D.
Influence of space use on fitness and the reintroduction success of the Laysan teal
Translocation is an important tool for wildlife conservation and biodiversity restoration, but an inefficient one because of the unpredictability of success. Predictors of success such as habitat quality of the release site and number of individuals released have been identified, but the dynamics of successful translocations remain poorly...Reynolds, M.H.; Hatfield, J.S.; Laniawe, L.P.; Vekasy, M.S.; Klavitter, J.L.; Berkowitz, P.; Crampton, L.H.; Walters, J.R.
New plant records from Hawai'i Island
The following plant records from the island of Hawai'i include 2 new state records, 6 new island records, 3 new records of naturalized species previously known to be present on the island, and 1 range extension of an orchid recently reported as naturalized. All cited voucher specimens are deposited at BISH.Pratt, Linda W.; Bio, Keali'i F.
A preliminary study of effects of feral pig density on native Hawaiian montane rainforest vegetation
This study aimed to examine the effects of different levels of pig density on native Hawaiian forest vegetation. Pig sign was measured across four pig management units in the 'Öla'a Forest from 1998 through 2004 and pig density estimated based upon pig activity. Six paired vegetation monitoring plots were established in the units, each pair...Scheffler, Pamela Y.; Pratt, Linda; Foote, David; Magnacca, Karl
Summary of bird-survey and banding results at W.L. Finley National Wildlife Refuge, 1998-2008
With some of the best remaining examples of oak habitats in the Willamette Valley, the Willamette Valley National Wildlife Refuge Complex (WVNWRC) has been implementing restoration efforts to reverse the successional trend towards Douglas-fir and maple that is threatening existing oak woodlands. The restoration work has been considered a model for...Hagar, Joan