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Determining species occurrence in ecosystems of high conservation concern is especially important for recommending habitat management techniques and identifying suitable restoration sites. We investigated (1) how stand- and landscape-scale attributes affect occupancy of priority bird species associated with longleaf pine (Pinus palutris) ecosystems, (2) if these priority birds can be used as indicator species for desired open pine forest structure, and (3) if these indicator species are positively correlated with greater avian richness. We compared priority bird occupancy among 12 stand types (habitat types) throughout the historic range of longleaf pine in Mississippi. We found stands resembling the historic longleaf...
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The Williston Basin, located in the NorthernGreat Plains, is experiencing rapid energy developmentwith North Dakota and Montana being the epicenter ofcurrent and projected development in the USA. Theaverage single-bore well pad is 5 acres with an estimated58,485 wells in North Dakota alone. This landscapeleveldisturbance may provide a pathway for the establishmentof non-native plants. To evaluate potentialinfluences of energy development on the presence andabundance of non-native species, vegetation surveyswere conducted at 30 oil well sites (14 ten-year-oldand 16 five-year-old wells) and 14 control sites in nativeprairie environments across the Williston Basin. Nonnativespecies richness and cover were recorded...
Hawaiian forest birds are imperiled, with fewer than half the original >40 species remaining extant. Recent studies document ongoing rapid population decline and project complete climate‐based range losses for the critically endangered Kaua’i endemics ‘akeke’e (Loxops caeruleirostris) and ‘akikiki (Oreomystis bairdi) by end‐of‐century due to projected warming. Climate change facilitates the upward expansion of avian malaria into native high elevation forests where disease was historically absent. While intensified conservation efforts attempt to safeguard these species and their habitats, the magnitude of potential loss and the urgency of this situation require all conservation options to be seriously considered....
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Oil development in the Bakken shale region has increased rapidly as a result of new technologies and strongdemand for fossil fuel. This region also supports a particularly high density and diversity of grassland bird species,which are declining across North America. We examined grassland bird response to unconventional oilextraction sites (i.e. developed with hydraulic fracturing and horizontal drilling techniques) and associatedroads in North Dakota. Our goal was to quantify the amount of habitat that was indirectly degraded by oil development,as evidenced by patterns of avoidance by birds. Grassland birds avoided areas within 150 m of roads(95% CI: 87–214 m), 267 m of single-bore well pads (95% CI: 157–378 m),...
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The 25,000 km of shoreline in southeast Alaska was surveyed for waterbirds by fixed-wing aircraft in summer and winter during the period 1997 to 2002. A ground/boat survey double sampled 20% of the summer habitat and 5% of the winter habitat to adjust and enhance the air survey. The most abundant species during the summer surveys, with visibility correction factors applied, were gulls (Larus spp.; 306,200, CV = 0.004), scoters (Melanitta spp.; 185,700, CV = 0.004), and Harlequin Duck (Histrionicus histrionicus; 34,640, CV = 0.03). The most abundant species observed during the winter surveys were goldeneyes (Bucephala islandica and B. clangula; 121,920, CV = 0.01), gulls (105,000, CV = 0.01), Mallard (Anas platyrhynchos;...
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Conant et al. (1991) describe swan survey methods used by the U.S. Fish and Wildlife Service in Alaska and present the results of surveys using these methods. Full citation: Conant, B., J.I. Hodges, and J. G. King. 1991. Continuity and advancement of trumpeter swan Cygnus buccinator and tundra swan Cygnus columbianus population monitoring in Alaska. Pages 125-136 in J. Sears and P.J. Bacon (Eds.) 1991. Proc. Third IWRB International Swan Symposium, Oxford 1989. Wildfowl Supplement No. 1.
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Quantitative studies focusing on the collection of semibuoyant fish eggs, which are associated with a pelagic broadcast-spawning reproductive strategy, are often conducted to evaluate reproductive success. Many of the fishes in this reproductive guild have suffered significant reductions in range and abundance. However, the efficiency of the sampling gear used to evaluate reproduction is often unknown and renders interpretation of the data from these studies difficult. Our objective was to assess the efficiency of a modified Moore egg collector (MEC) using field and laboratory trials. Gear efficiency was assessed by releasing a known quantity of gellan beads with a specific gravity similar to that of eggs from representatives...
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This 1996 publication by John I. Hodges, James G. King, Bruce Conant, and Henry A. Hanson summarized population abundance trends of waterfowl, loons, and sandhill cranes from data collected in the Alaska strata (i.e., strata 1-11) of the North American Waterfowl Breeding Population and Habitat Survey during 1957-1994. The authors also presented results of analyses that compared the detection rates of right- vs. left-seat observers (i.e., with vs. without piloting duties).
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Conant et al. (2002) present the results of trumpeter swan censuses conducted by the U.S. Fish and Wildlife Service in Alaska between 1968 and 2000. Full citation: Conant, B., J.I. Hodges, D.J. Groves, and J. G. King. 2002. Census of trumpeter swans on Alaskan nesting habitats, 1968-2000. Waterbirds: The International Journal of Waterbird Biology, v. 25, Special Publication 1: Proceedings of the Fourth International Swan Symposium 2001, pp 3-7.
    map background search result map search result map Sampling Efficiency of the Moore Egg Collector Avoidance of unconventional oil wells and roads exacerbates habitat loss for grassland birds in the North American great plains Presence and abundance of non-native plant species associated with recent energy development in the Williston Basin Distribution and abundance of waterbirds near shore in southeast Alaska 1997-2002 Census of trumpeter swans on Alaskan nesting habitats, 1968-2000 publication Continuity and advancement of trumpeter swan Cygnus buccinator and tundra swan (Cygnus columbianus) population monitoring in Alaska 1991 publication Publication: Aerial Surveys of Waterbirds in Alaska 1957-1994 Avoidance of unconventional oil wells and roads exacerbates habitat loss for grassland birds in the North American great plains Sampling Efficiency of the Moore Egg Collector Distribution and abundance of waterbirds near shore in southeast Alaska 1997-2002 Presence and abundance of non-native plant species associated with recent energy development in the Williston Basin Publication: Aerial Surveys of Waterbirds in Alaska 1957-1994 Census of trumpeter swans on Alaskan nesting habitats, 1968-2000 publication Continuity and advancement of trumpeter swan Cygnus buccinator and tundra swan (Cygnus columbianus) population monitoring in Alaska 1991 publication