A5101419991- Isotope Analysis in Ecology
- Fish Ecology and Management Studies
- Marine and fisheries research
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Groundwater and Isotope Geochemistry
- Aquatic Invertebrate Ecology and Behavior
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Geological Studies and Exploration
- Marine animal studies overview
- Mercury impact and mitigation studies
- Amino Acid Enzymes and Metabolism
- Hydrological Forecasting Using AI
- Soil erosion and sediment transport
- Atmospheric and Environmental Gas Dynamics
- Smart Materials for Construction
- Fish Biology and Ecology Studies
- Flood Risk Assessment and Management
- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Environmental Monitoring and Data Management
- Identification and Quantification in Food
- Hydrology and Sediment Transport Processes
- Cryospheric studies and observations
University of Washington
2016-2024
University of Alaska Fairbanks
2014-2015
University of Alaska Southeast
2014
University of Canberra
2008
Watersheds are complex mosaics of habitats whose conditions vary across space and time as landscape features filter overriding climate forcing, yet the extent to which reliability ecosystem services depends on these dynamics remains unknown. We quantified how shifting habitat expressed a range spatial scales within large, free-flowing river, they stabilize production Pacific salmon that support valuable fisheries. The strontium isotope records ear stones (otoliths) show relative productivity...
Highly migratory organisms present major challenges to conservation efforts. This is especially true for exploited anadromous fish species, which exhibit long-range dispersals from natal sites, complex population structures, and extensive mixing of distinct populations during exploitation. By tracing the histories individual Chinook salmon caught in fisheries using strontium isotopes, we determined relative production habitats at fine spatial scales different life histories. Although...
Abstract A critical challenge for the Earth sciences is to trace transport and flux of matter within among aquatic, terrestrial, atmospheric systems. Robust descriptions isotopic patterns across space time, called “isoscapes,” form basis a rapidly growing wide‐ranging body research aimed at quantifying connectivity Earth's However, isoscapes rivers have been limited by conventional Euclidean approaches in geostatistics lack quantitative framework apportion influence processes driven...
Abstract Production patterns of highly mobile species, such as anadromous fish, often exhibit high spatial and temporal heterogeneity across landscapes. Such variability is asynchronous in time among habitats, which stabilizes production at aggregate scales complexity. Reconstructing explicitly space multiple scales, however, remains difficult but important for prioritizing habitat conservation. This especially true fishes inhabiting river basins due to long‐range dispersal, mortality early...
Abstract Migratory animals pose difficult challenges to conservation and management because identifying critical habitats used throughout their lives is rarely possible. Endogenous tracers (e.g. isotope ratios) recorded in sequentially growing biogenic tissues, however, represent a potential source of unique insights at the more elusive temporal spatial scales central understanding ecology mobile species. To this end, general probabilistic framework has emerged that quantitatively compares...
Abstract Riverine chemistry reflects both watershed conditions and instream processing, of which vary across river networks, yet little is known about the scales at attributes regulate biogeochemical constituents. We used spatial stream network (SSN) models to quantify effects on streamwater constituents in Kuskokwim River (western Alaska), largest free‐flowing United States. assessed chemical spanning from labile nutrients (nitrate [NO 3 − ] orthophosphate [PO 4 3− ]) biologically...
Abstract Human activities threaten the biodiversity of aquatic mammals across globe. Conservation these species hinges on ability to delineate movements and foraging behaviors animals, but gaining such insights is hampered by difficulties in tracing individuals over their lives. We determined isotope ratios teeth ( 87 Sr/ 86 Sr, 13 C/ 12 C, 18 O/ 16 O) examine lifelong movement resource‐use patterns a unique freshwater population wide‐ranging pinniped (harbor seal [ Phoca vitulina ]) that...
Life-history diversity has been shown to contribute the resilience of species but can be challenging quantify, particularly where intra-population genetic structure is lacking. Such case for salmon within many fisheries North American Pacific Northwest, resolution markers variable and limited. For Sockeye (Oncorhynchus nerka) U.S.-Canada transboundary Taku Watershed, example, single-nucleotide polymorphisms have successfully distinguished populations associated with specific inland lakes...
Freshwater mercury (Hg) contamination is a widespread environmental concern but how proximate sources and downstream transport shape Hg spatial patterns in riverine food webs poorly understood. We measured total (THg) slimy sculpin (Cottus cognatus) across the Kuskokwim River, large boreal river western Alaska home to subsistence fishing communities who rely on fish for primary nutrition. used stream network models (SSNMs) quantify watershed instream conditions influencing THg. Spatial...
Abstract Conserving wild fisheries requires identifying and monitoring distinct populations, yet prevalent genetic approaches often do not integrate habitat data may fully delineate these structures. This issue is critical in sea/river‐type sockeye salmon ( Oncorhynchus nerka ), an ecotype whose specific spawning habitats better define breeding populations. Despite possessing traits that confer greater resilience to climate change significant contributions fisheries, gene flow among groups...