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  • Life Cycle Modeling of Life History Diversity and Habitat Relationships


Northwest Fisheries Science Center (NWFSC) Fish Ecology FE - Watershed


Life cycle modeling
Life Cycle Modeling of Life History Diversity and Habitat Relationships
The goals of this project are to examine 1) the relative importance of multiple aquatic habitats (streams, estuaries, and nearshore areas, for example) used by salmon during their migration, 2) evaluate how different forms of density dependence influence the relative importance of these habitats, and 3) determine the influence of life history variation on extinction risk. Analyses of Skagit Chinook, OR coho, and Winter run Chinook are currently being examined

Research Themes

Habitats to support sustainable fisheries and recovered populations
Healthy oceans, coastal waters, and riverine habitats provide the foundation for aquatic resources used by a diversity of species and society. Protecting marine, estuarine and freshwater ecosystems that support these species relies on science to link habitat condition/processes and the biological effects of restoration actions. The NWFSC provides the habitat science behind many management actions taken by NOAA Fisheries and other natural resource agencies to protect and recover aquatic ecosystems and living marine resources. The NWFSC also maintains a longstanding focus on toxic chemical contaminants, as a foundation for regional and national research on pollution threats to fisheries and protected resources.

Research Foci

Develop effective and efficient habitat restoration and conservation techniques
Maintaining and re-establishing viability and sustainability of living marine resources requires conservation and rehabilitation or restoration of habitats upon which species depend. Common habitat restoration approaches and tech-niques often presume that habitats are static features of the environment, and that creation of stable habitats is a desirable restoration strategy. However, riverine, nearshore, and marine habitats are created and sustained by dynamic landscape, climatic, and oceanographic processes and biota are adapted to changing habitats that are within the range of natural variability. Hence, current restoration strategies often have limited success, in part because they fail to recognize larger scale processes that drive habitat change, and in part because they fail to recognize intrinsic habitat potential of individual restoration sites. The main goals of this research focus are to: improve understanding of how large-scale processes create diverse and dynamic habitats that support marine and anadromous species, better understand how human activities alter habitat-forming processes and habitats, develop new restoration techniques that are compatible with sustainable habitat-forming processes, and understand the variety of actions needed to adequately conserve intact critical habitats. In addition, NWFSC’s research will improve understanding of how new and existing habitat restoration and protection techniques affect fish and habitat at multiple scales (i.e., reach, watershed, Evolutionarily Significant Unit).


habitat capacity
maximum density or abundance for a particular habitat type or unit
habitat use
how animals use their environment (e.g., foraging)
life history variation
Variation in life history types in a population
all salmonids
survival modeling
Survival CJS (Cormack-Jolly-Seber) modeling


None associated


Genus Oncorhynchus


Correigh Greene
Principal Investigator
Hiroo Imaki