Browsing by Subject "reproductive success"

Now showing 1 - 3 of 3
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    Data supporting the comparison of golden-winged warbler and American woodcock productivity in northern Minnesota, USA
    (2019-02-06) Kramer, Gunnar R; Peterson, Sean M; Daly, Kyle O; Streby, Henry M; Andersen, David E; gunnarrkramer@gmail.com; Kramer, Gunnar R; Minnesota Cooperative Fish and Wildlife Research Unit
    Spatially explicit predicted reproductive output for golden-winged warblers and American woodcock at Tamarac National Wildlife Refuge, Minnesota, USA used to compare reproductive output of woodcock and warblers in Kramer et al. (2019; DOI:https://doi.org/10.1016/j.biocon.2019.02.039). Models developed by Peterson (2014: http://hdl.handle.net/11299/167309),Peterson et al. (2016) rely on raw demographic data for golden-winged warblers collected and reported by Peterson (2014; http://hdl.handle.net/11299/167309). Models developed by Kramer (2017; http://hdl.handle.net/11299/188784) and Kramer et al. (in press) use raw demographic data for American woodcock collected and reported by Daly (2014; http://hdl.handle.net/11299/167288).
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    Eastern larch beetle reproductive success in western and subalpine larch
    (2024-10-31) Picklo, Rose; Eidson, Erika; Steed, Brytten; Aukema, Brian; bhaukema@umn.edu; Aukema, Brian; University of Minnesota Forest Entomology Lab
    Eastern larch beetle Dendroctonus simplex LeConte has been outbreaking for the past two decades in the Great Lakes region of North America, impacting approximately 400,000 hectares of eastern larch Larix laricina (tamarack) forest in Minnesota, United States, alone. Range expansions of some Dendroctonus species driven by climate change have occurred across North America as rising temperatures increase climatically suitable habitats across latitudes and elevations. The range of eastern larch beetle is currently sympatric to that of its host, eastern larch, but the insect could, in theory, eventually access ranges of other species of Larix native to North America. We compared host suitability of two potential novel hosts, western larch (Larix occidentalis Nutt.) and subalpine larch (Larix lyalli Parl.) against the beetle’s native host, eastern larch, using a reproductive success experiment conducted in cut bolts of all three species. We measured fertility, maternal gallery length, and offspring size and lipid content as metrics of reproductive success. We share data here upon publication of this work in the journal Frontiers in Forests and Global Change.
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    Habitat use and reproductive success of waterbirds in the human-dominated landscape of North America’s prairies: Using sparse data to inform management
    (2018-05) Specht, Hannah
    Information needed to implement effective management strategies requires an understanding of where, when and how target species use habitats available to them to survive and reproduce. I used new approaches for field data collection and analysis for rare and cryptic species to improve understanding of how anthropogenic and natural habitat characteristics affect the habitat use and reproductive success of grassland waterbirds, to better inform management in North America’s Northern Great Plains. Using historical data on waterfowl age ratios at banding and a database of upland shorebird nest records, I identified spatial and temporal variation in upland nesting waterfowl and shorebird fecundity. Specifically, I found positive relationships between vole population irruptions and metrics of fecundity (age ratios and nest survival) in both upland nesting waterfowl and shorebirds, and that fecundity of both groups was tightly tied to wetland conditions; increases in wetland inundation improved dabbling duck fecundity and Marbled Godwits (Limosa fedoa) experienced higher fecundity in territories with greater wetland cover. Density dependent effects were mixed across species. I used occupancy surveys with behavioral indicators of brood presence to assess whether habitat use by conservation concern upland shorebirds and Northern Pintail (Anas acuta) was altered by oil development in the Bakken oil field, using habitat suitability models to account for natural variation in habitat quality. I found reduced habitat use by breeding pairs and/or broods of all five studied species at sites with higher traffic and that Wilson’s phalarope (Phalaropus tricolor) breeding pairs avoided habitat with higher well density. Using behavior to infer brood presence facilitated identifying effects of traffic on brood habitat use where data would otherwise have been too sparse. Finally, I present a new occupancy survey sampling design that improves estimates for rare species. Management for upland-nesting waterbirds should continue to prioritize maintaining the capacity of less permanent wetland basins to rehydrate and active patch management of grassland. Infrastructure and activity that impacts grassland wildlife should be concentrated within corridors on the landscape while conservation should be concentrated in spaces between development corridors.