Carson A. Jeffres
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View article: Inter-method differences (SIMS vs. IRMS) in oxygen isotope fractionation: insights from Chinook salmon otoliths
Inter-method differences (SIMS vs. IRMS) in oxygen isotope fractionation: insights from Chinook salmon otoliths Open
View article: Archaeological evidence across four millennia indicates recent erosion of Chinook salmon age structure in California
Archaeological evidence across four millennia indicates recent erosion of Chinook salmon age structure in California Open
Chinook salmon Oncorhynchus tshawytscha provide crucial ecosystem services, but their populations are in steep decline throughout their native range. Recent decades have seen widespread erosion of age structures, but the lack of long-term …
View article: Enhancing reproducibility in stable isotope analysis (SIA) of fish eye lenses: A comparison between lamina number and diameter
Enhancing reproducibility in stable isotope analysis (SIA) of fish eye lenses: A comparison between lamina number and diameter Open
Analyzing stable isotopes in archival tissues, such as fish eye lenses, is used to document shifts in feeding ecology, diet, habitat use, and to reconstruct life history. Fish eye lenses grow throughout their ontogeny, forming multiple seq…
View article: Widespread thiamine deficiency in California salmon linked to an anchovy-dominated marine prey base
Widespread thiamine deficiency in California salmon linked to an anchovy-dominated marine prey base Open
Thiamine (vitamin B 1 ) deficiency in marine systems is a globally significant threat to marine life. In 2020, newly hatched Chinook salmon ( Oncorhynchus tshawytscha ) fry in California’s Central Valley (CCV) hatcheries swam in corkscrew …
View article: Springtime upwelling conditions influence microbial communities and dissolved thiamin compounds in the California Current Ecosystem
Springtime upwelling conditions influence microbial communities and dissolved thiamin compounds in the California Current Ecosystem Open
Understanding dissolved concentrations of the essential coenzyme thiamin (vitamin B 1 ) can provide insights into the biological controls on highly productive upwelling systems such as the California Current Ecosystem. To connect thiamin a…
View article: Early evidence for establishment of a Chinook salmon population in a restored watershed
Early evidence for establishment of a Chinook salmon population in a restored watershed Open
As fish populations face compounding pressures under climate change, highly modified rivers are receiving increasing research and conservation attention as important sites for restoration. Across the North Pacific Ocean, Chinook salmon ( O…
View article: First report of Vandellia sp. parasiting the Raspy river stingray Potamotrygon scobina in the Amazon basin
First report of Vandellia sp. parasiting the Raspy river stingray Potamotrygon scobina in the Amazon basin Open
This study reports the first record of candiru, Vandellia sp. parasitizing the freshwater stingray Potamotrygon scobina in the Amazon basin, Brazil. In April 2018, a specimen of Potamotrygon scobina was collected by bottom long-term using …
View article: Reconstructing salmon growth trajectories through biochronologies across a highly variable growthscape
Reconstructing salmon growth trajectories through biochronologies across a highly variable growthscape Open
Measuring the growth of migratory fish across habitats is difficult because field observations only provide a snapshot into their life; yet, understanding which habitats provide better growth opportunities is crucial for their conservation…
View article: Investigation of Floating Peat Wetlands, Sacramento–San Joaquin Delta, California
Investigation of Floating Peat Wetlands, Sacramento–San Joaquin Delta, California Open
Tidal wetland restoration is integral to achieving the Delta coequal goals. Deeply subsided islands limit the potential for tidal wetland restoration. Floating peats may offer an opportunity to create tidal habitat in the subsided western …
View article: Does Method of Field Preparation Affect Survival and Growth of Juvenile Chinook Salmon in Agricultural Floodplains?
Does Method of Field Preparation Affect Survival and Growth of Juvenile Chinook Salmon in Agricultural Floodplains? Open
There is growing interest to integrate conservation initiatives into agricultural practices using a reconciliation ecology framework. In California's Central Valley, one approach to improving crucial nursery habitat for threatened and enda…
View article: Foodscapes for salmon and other mobile consumers in river networks
Foodscapes for salmon and other mobile consumers in river networks Open
Mobile consumers track fluctuating resources across heterogeneous landscapes to grow and survive. In river networks, the abundance and accessibility of food and the energetic consequences of foraging vary among habitats and through time, p…
View article: Restoring freshwater habitat mosaics to promote resilience of vulnerable salmon populations
Restoring freshwater habitat mosaics to promote resilience of vulnerable salmon populations Open
Phenotypic diversity and abundance drive salmon resilience in the face of increasing environmental variability. But what happens when human activities fundamentally alter the habitat complexity that drives this diversity? And how can we re…
View article: Forensic geochemistry identifies the illegal introduction of Walleye into Lake Cascade, Idaho
Forensic geochemistry identifies the illegal introduction of Walleye into Lake Cascade, Idaho Open
Objective The illegal introduction of fish species can disrupt ecosystems, collapse food webs, and undermine recreational fishing opportunities. Determining whether introduced fish are locally reproducing is important for resource managers…
View article: Does method of field preparation affect survival and growth of juvenile Chinook salmon in agricultural floodplains?
Does method of field preparation affect survival and growth of juvenile Chinook salmon in agricultural floodplains? Open
There is growing interest to integrate conservation initiatives into agricultural practices using a reconciliation ecology framework. In California’s Central Valley, one approach to improving crucial nursery habitat for threatened and enda…
View article: Connecting thiamine availability to the microbial community composition in Chinook salmon spawning habitats of the Sacramento River basin
Connecting thiamine availability to the microbial community composition in Chinook salmon spawning habitats of the Sacramento River basin Open
Thiamine deficiency complex (TDC) is a major emerging threat to global populations of culturally and economically important populations of salmonids. Salmonid eggs and embryos can assimilate exogenous thiamine, and evidence suggests that m…
View article: Foodscapes for Salmon and Other Mobile Consumers in River Networks
Foodscapes for Salmon and Other Mobile Consumers in River Networks Open
Mobile consumers track fluctuating resources across heterogeneous landscapes to grow and survive. In river networks, the abundance and accessibility of food and the costs of foraging vary between habitats and through time, providing a shif…
View article: Connecting Thiamine Availability to the Microbial Community Composition in Chinook Salmon Spawning Habitats of the Sacramento River Basin
Connecting Thiamine Availability to the Microbial Community Composition in Chinook Salmon Spawning Habitats of the Sacramento River Basin Open
Thiamine Deficiency Complex (TDC) is a major emerging threat to global populations of culturally and economically important populations of salmonids. Salmonid eggs and embryos can assimilate exogenous thiamine, and evidence suggests that m…
View article: First record of plastic ingestion by a freshwater stingray
First record of plastic ingestion by a freshwater stingray Open
View article: First Record of Plastic Ingestion by a Freshwater Stingray
First Record of Plastic Ingestion by a Freshwater Stingray Open
View article: Behavioral cues enable native fishes to exit a California floodplain while leaving non‐native fishes behind
Behavioral cues enable native fishes to exit a California floodplain while leaving non‐native fishes behind Open
Floodplains are highly productive environments that provide critical rearing habitat and increased growth for diverse native fishes, including juvenile Chinook salmon ( Oncorhynchus tshawytscha ). Yet, stranding during the flood recession …
View article: Floodplain trophic subsidies in a modified river network: managed foodscapes of the future?
Floodplain trophic subsidies in a modified river network: managed foodscapes of the future? Open
View article: Variability in foodscapes and fish growth across a habitat mosaic: Implications for management and ecosystem restoration
Variability in foodscapes and fish growth across a habitat mosaic: Implications for management and ecosystem restoration Open
Riverine ecosystems in their natural state are complex mosaics of habitats whose conditions vary across space and time as landscape features filter prevailing hydrologic forcing. Yet, through anthropogenic alteration many large river syste…
View article: Mechanisms, Impacts, and Mitigation for Thiamine Deficiency and Early Life Stage Mortality in California’s Central Valley Chinook Salmon
Mechanisms, Impacts, and Mitigation for Thiamine Deficiency and Early Life Stage Mortality in California’s Central Valley Chinook Salmon Open
View article: Biogeochemical processes create distinct isotopic fingerprints to track floodplain rearing of juvenile salmon
Biogeochemical processes create distinct isotopic fingerprints to track floodplain rearing of juvenile salmon Open
Floodplains represent critical nursery habitats for a variety of fish species due to their highly productive food webs, yet few tools exist to quantify the extent to which these habitats contribute to ecosystem-level production. Here we co…
View article: Not All Rivers Are Created Equal: The Importance of Spring-Fed Rivers under a Changing Climate
Not All Rivers Are Created Equal: The Importance of Spring-Fed Rivers under a Changing Climate Open
In the Western United States, volcanic spring-fed rivers are anticipated to become increasingly more important for salmonids and other native fishes, as these rivers will retain coldwater habitats as the climate warms. Despite this, little…
View article: Reconciling fish and farms: Methods for managing California rice fields as salmon habitat
Reconciling fish and farms: Methods for managing California rice fields as salmon habitat Open
Rearing habitat for juvenile Chinook Salmon ( Oncorhynchus tshawytscha ) in California, the southernmost portion of their range, has drastically declined throughout the past century. Recently, through cooperative agreements with diverse st…
View article: Understanding community assembly rules in managed floodplain food webs
Understanding community assembly rules in managed floodplain food webs Open
Community assembly has been an important topic in ecological research and theory for over a century. Recently, restoration ecologists have emphasized the use of community assembly rules, such as environmental filtering, to better inform ma…
View article: Advancing diet reconstruction in fish eye lenses
Advancing diet reconstruction in fish eye lenses Open
Tracking habitat use and dietary shifts in migratory species is vital to conservation and management. Yet, conventional animal tracking often precludes tracking small juveniles at critical life stages where recruitment bottlenecks often ma…
View article: Rapture facilitates inexpensive and high-throughput parent-based tagging in salmonids
Rapture facilitates inexpensive and high-throughput parent-based tagging in salmonids Open
Accurate methods for tracking individuals are crucial to the success of fisheries and aquaculture management. Management of migratory salmonid populations, which are important for the health of many economies, ecosystems, and indigenous cu…
View article: Juvenile Chinook Salmon Weight Prediction Using Image-Based Morphometrics
Juvenile Chinook Salmon Weight Prediction Using Image-Based Morphometrics Open
We developed an empirical weight prediction model for juvenile Chinook Salmon Oncorhynchus tshawytscha ranging from 33–113 mm FL and 0.35–14.86 g using morphometrics analysis on images that were collected from live fish in the field. This …