Life Histories of Aquatic Species Active
Many species exhibit diverse behaviors that translate into different patterns of habitat use and demography. Diversity within species can be related to a complex array of processes, including genetic and maternal influences, and external environmental drivers. Our work addresses life history diversity in salmon and trout, including Pacific salmon, steelhead and rainbow trout, cutthroat trout, and bull trout. We have also begun to study life histories of lesser known species, such as western pearlshell mussels (Margaritifera falcata), which can live for more than 100 years in rivers. Understanding the full range of life histories and how they link to environmental conditions is critical for understanding long-term species persistence and viability.
Below are publications associated with this project.
Ecological and evolutionary patterns of freshwater maturation in Pacific and Atlantic salmonines
Influence of sex, migration distance, and latitude on life history expression in steelhead and rainbow trout (Oncorhynchus mykiss)
Variability in expression of anadromy by female Oncorhynchus mykiss within a river network
Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, ncorhynchus mykiss
Fine scale relationships between sex, life history, and dispersal of masu salmon
Freshwater ecosystems and resilience of Pacific salmon: Habitat Management based on natural variability
Influences of body size and environmental factors on autumn downstream migration of bull trout in the Boise River, Idaho
Fine-scale natal homing and localized movement as shaped by sex and spawning habitat in chinook salmon
Landscape attributes and life history variability shape genetic structure of trout populations in a stream network
Habitat segregation of Ambystoma gracile and Ambystoma macrodactylum in mountain ponds, Mount Rainer National Park, Washington, USA
- Overview
Many species exhibit diverse behaviors that translate into different patterns of habitat use and demography. Diversity within species can be related to a complex array of processes, including genetic and maternal influences, and external environmental drivers. Our work addresses life history diversity in salmon and trout, including Pacific salmon, steelhead and rainbow trout, cutthroat trout, and bull trout. We have also begun to study life histories of lesser known species, such as western pearlshell mussels (Margaritifera falcata), which can live for more than 100 years in rivers. Understanding the full range of life histories and how they link to environmental conditions is critical for understanding long-term species persistence and viability.
- Publications
Below are publications associated with this project.
Filter Total Items: 22Ecological and evolutionary patterns of freshwater maturation in Pacific and Atlantic salmonines
Reproductive tactics and migratory strategies in Pacific and Atlantic salmonines are inextricably linked through the effects of migration (or lack thereof) on age and size at maturity. In this review, we focus on the ecological and evolutionary patterns of freshwater maturation in salmonines, a key process resulting in the diversification of their life histories. We demonstrate that the energeticsAuthorsMatthew R. Sloat, Dylan J. Fraser, Jason B. Dunham, Jeffery A. Falke, Chris E. Jordan, John R. McMillan, Haley A. OhmsInfluence of sex, migration distance, and latitude on life history expression in steelhead and rainbow trout (Oncorhynchus mykiss)
Abstract:In partially migratory species, such as Oncorhynchus mykiss, the emergence of life history phenotypes is often attributed to fitness trade-offs associated with growth and survival. Fitness trade-offs can be linked to reproductive tactics that vary between the sexes, as well as the influence of environmental conditions. We found that O. my kiss outmigrants are more likely to be female in ninAuthorsHaley A. Ohms, Matthew R. Sloat, Gordon H. Reeves, Chris E. Jordan, Jason B. DunhamVariability in expression of anadromy by female Oncorhynchus mykiss within a river network
We described and predicted spatial variation in marine migration (anadromy) of female Oncorhynchus mykiss in the John Day River watershed, Oregon. We collected 149 juvenile O. mykiss across 72 sites and identified locations used by anadromous females by assigning maternal origin (anadromous versus non-anadromous) to each juvenile. These assignments used comparisons of strontium to calcium ratios iAuthorsJustin S. Mills, Jason B. Dunham, Gordon H. Reeves, John R. McMillan, Christian E. Zimmerman, Chris E. JordanIndividual condition and stream temperature influence early maturation of rainbow and steelhead trout, ncorhynchus mykiss
Alternative male phenotypes in salmonine fishes arise from individuals that mature as larger and older anadromous marine-migrants or as smaller and younger freshwater residents. To better understand the processes influencing the expression of these phenotypes we examined the influences of growth in length (fork length) and whole body lipid content in rainbow trout (Oncorhynchus mykiss). Fish wereAuthorsJohn R. McMillan, Jason B. Dunham, Gordon H. Reeves, Justin S. Mills, Chris E. JordanFine scale relationships between sex, life history, and dispersal of masu salmon
Identifying the patterns and processes driving dispersal is critical for understanding population structure and dynamics. In many organisms, sex-biased dispersal is related to the type of mating system. Considerably less is known about the influence of life history variability on dispersal. Here we investigated patterns of dispersal in masu salmon (Oncorhynchus masou) to evaluate influences of sexAuthorsShigeru Kitanishi, Toshiaki Yamamoto, Itsuro Koizumi, Jason B. Dunham, Seigo HigashiFreshwater ecosystems and resilience of Pacific salmon: Habitat Management based on natural variability
In spite of numerous habitat restoration programs in fresh waters with an aggregate annual funding of millions of dollars, many populations of Pacific salmon remain significantly imperiled. Habitat restoration strategies that address limited environmental attributes and partial salmon life-history requirements or approaches that attempt to force aquatic habitat to conform to idealized but ecologicAuthorsP.A. Bisson, J. B. Dunham, G.H. ReevesInfluences of body size and environmental factors on autumn downstream migration of bull trout in the Boise River, Idaho
Many fishes migrate extensively through stream networks, yet patterns are commonly described only in terms of the origin and destination of migration (e.g., between natal and feeding habitats). To better understand patterns of migration in bull trout,Salvelinus confluentus we studied the influences of body size (total length [TL]) and environmental factors (stream temperature and discharge) on migAuthorsL. Monnot, J. B. Dunham, T. Hoem, P. KoetsierFine-scale natal homing and localized movement as shaped by sex and spawning habitat in chinook salmon
Natal homing is a hallmark of the life history of salmonid fishes, but the spatial scale of homing within local, naturally reproducing salmon populations is still poorly understood. Accurate homing (paired with restricted movement) should lead to the existence of fine-scale genetic structuring due to the spatial clustering of related individuals on spawning grounds. Thus, we explored the spatial rAuthorsHelen Neville, Daniel Isaak, J. B. Dunham, Russel Thurow, B. RiemanLandscape attributes and life history variability shape genetic structure of trout populations in a stream network
Spatial and temporal landscape patterns have long been recognized to influence biological processes, but these processes often operate at scales that are difficult to study by conventional means. Inferences from genetic markers can overcome some of these limitations. We used a landscape genetics approach to test hypotheses concerning landscape processes influencing the demography of Lahontan cutthAuthorsH.M. Neville, J. B. Dunham, M.M. PeacockHabitat segregation of Ambystoma gracile and Ambystoma macrodactylum in mountain ponds, Mount Rainer National Park, Washington, USA
Ambystoma gracile (Baird) and Ambystoma macrodactylum Baird are common salamander species occupying key trophic positions in mountain ponds and lakes of Mount Rainier National Park (MORA). Based on amphibian surveys conducted in ponds and lakes in the northeast quadrant of MORA during the summers of 1993a??1995, 20 sites were resampled in 1996 to document and evaluate distributions of the two specAuthorsRobert L. Hoffman, Gary L. Larson, Brendan J. Brokes