Difference between revisions of "Coho Salmon Crisis in the Central California Coast ESU"
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== Summary == | == Summary == | ||
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Marin County's Lagunitas Creek Watershed, once held out as a statewide model for fisheries restoration, is now hanging in the balance with an unprecedented 90% decline in coho salmon returning to spawn so far this year. Fisheries and watershed biologists say that several years of exceptionally reduced winter rainfall have contributed to the worst coho salmon return in recorded history. The decreased rainfall translates as reduced creek flow which prevents salmon from effectively swimming upstream and being more vulnerable to predation in the open ocean. | Marin County's Lagunitas Creek Watershed, once held out as a statewide model for fisheries restoration, is now hanging in the balance with an unprecedented 90% decline in coho salmon returning to spawn so far this year. Fisheries and watershed biologists say that several years of exceptionally reduced winter rainfall have contributed to the worst coho salmon return in recorded history. The decreased rainfall translates as reduced creek flow which prevents salmon from effectively swimming upstream and being more vulnerable to predation in the open ocean. | ||
| − | + | === History === | |
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Lagunitas Creek Watershed offers unique spawning grounds in that it is in the midst of a developed area. While historic Coho salmon runs numbered in the thousands a hundred years ago, subsequent redwood logging operations followed by road and housing construction reduced the original salmon habitat to 40% of its original size. The 7 dams spread throughout the area also significantly blocked off historic salmon habitat while also reducing gravel needed for spawning while also increasing creek sediment. In the early 1980s, restoration efforts started with the lobbying of a ''Trout Unlimited'' to the county make efforts to halt the salmon fishery decline. | Lagunitas Creek Watershed offers unique spawning grounds in that it is in the midst of a developed area. While historic Coho salmon runs numbered in the thousands a hundred years ago, subsequent redwood logging operations followed by road and housing construction reduced the original salmon habitat to 40% of its original size. The 7 dams spread throughout the area also significantly blocked off historic salmon habitat while also reducing gravel needed for spawning while also increasing creek sediment. In the early 1980s, restoration efforts started with the lobbying of a ''Trout Unlimited'' to the county make efforts to halt the salmon fishery decline. | ||
| − | + | ===Significance=== | |
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This unprecedented decline is particularly troublesome because the Lagunitas Creek Watershed is considered one of California's most critical ecosystems for endangered coho salmon. Historically the Lagunitas Creek Watershed has been California's largest wild salmon run, regularly supporting 10% of the state's Coho Salmon population. The Lagunitas Creek watershed salmon population is also considered considered critical for the coho salmon population of the entire central California coast. Salmon have been regularly taken from this watershed to supplement populations in regional watersheds. This local scale salmon decline is consistent with the recent plummeting of statewide salmon populations that prompted the closure of chinook salmon fishing along the west coast. | This unprecedented decline is particularly troublesome because the Lagunitas Creek Watershed is considered one of California's most critical ecosystems for endangered coho salmon. Historically the Lagunitas Creek Watershed has been California's largest wild salmon run, regularly supporting 10% of the state's Coho Salmon population. The Lagunitas Creek watershed salmon population is also considered considered critical for the coho salmon population of the entire central California coast. Salmon have been regularly taken from this watershed to supplement populations in regional watersheds. This local scale salmon decline is consistent with the recent plummeting of statewide salmon populations that prompted the closure of chinook salmon fishing along the west coast. | ||
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This page may contain student work completed as part of assigned coursework. It may not be accurate. It does not necessary reflect the opinion or policy of [[CSUMB]], its staff, or students. | This page may contain student work completed as part of assigned coursework. It may not be accurate. It does not necessary reflect the opinion or policy of [[CSUMB]], its staff, or students. | ||
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Revision as of 18:32, 24 January 2009
A watershed-related issue examined by the ENVS 560/L Watershed Systems class at CSUMB.
Contents
Summary
Current Issue
Marin County's Lagunitas Creek Watershed, once held out as a statewide model for fisheries restoration, is now hanging in the balance with an unprecedented 90% decline in coho salmon returning to spawn so far this year. Fisheries and watershed biologists say that several years of exceptionally reduced winter rainfall have contributed to the worst coho salmon return in recorded history. The decreased rainfall translates as reduced creek flow which prevents salmon from effectively swimming upstream and being more vulnerable to predation in the open ocean.
History
Lagunitas Creek Watershed offers unique spawning grounds in that it is in the midst of a developed area. While historic Coho salmon runs numbered in the thousands a hundred years ago, subsequent redwood logging operations followed by road and housing construction reduced the original salmon habitat to 40% of its original size. The 7 dams spread throughout the area also significantly blocked off historic salmon habitat while also reducing gravel needed for spawning while also increasing creek sediment. In the early 1980s, restoration efforts started with the lobbying of a Trout Unlimited to the county make efforts to halt the salmon fishery decline.
Significance
This unprecedented decline is particularly troublesome because the Lagunitas Creek Watershed is considered one of California's most critical ecosystems for endangered coho salmon. Historically the Lagunitas Creek Watershed has been California's largest wild salmon run, regularly supporting 10% of the state's Coho Salmon population. The Lagunitas Creek watershed salmon population is also considered considered critical for the coho salmon population of the entire central California coast. Salmon have been regularly taken from this watershed to supplement populations in regional watersheds. This local scale salmon decline is consistent with the recent plummeting of statewide salmon populations that prompted the closure of chinook salmon fishing along the west coast.
Location
Lagunita Creek Watershed winds through San Geronimo Valley on the northwest side of Mount Tamalpaisis in Marin County, California.
Resource/s at stake
Fishery biologists fear that the endangered Coho Salmon are threatened with spawning failure and possible extinction for the year. biologically speaking, diminished population size can negatively effect the genetic diversity of the population and thus reduce fitness or viability for the future. Economically, reduced salmon numbers can result in a significant negative financial impact on human communities that have relied on salmon fishing for income and tourism.
Stakeholders
...Who are the stakeholders in the watershed? e.g. agencies, non-profits, associations...
Salmon Protection and Watershed Network, or SPAWN. Trout Unlimited- lobbyists SPAWN, which was created in 1996, sponsors salmon-watching creek walks during spawning season and has saved more than 15,000 juvenile salmon and steelhead from drying pools during the summer. The Marin Municipal Water District, which is required by the state to help the coho as mitigation for raising Peter's Dam, started counting coho redds in the early 1990s and now works with SPAWN to monitor releases from the dam, install woody debris in the creeks and replant vegetation. National Marine Fisheries biologist
many residents have taken a proprietary interest in the fish. Schools have become involved, organizing work parties and teaching children about the historic coho migration
fishers
Laws, policies, & regulations
...What laws, policies, and/or regulations are involved?... The CDFG, National Marine Fisheries Since coho were listed as endangered in 2005 under the Endangered Species Act,
Systems
Climate change may be contributing The salmon form part of the food web ... What elements of the biophysical system are/were involved?...
Science
...What scientific studies are or would be relevant / already completed?...
Tools
...What analytical (e.g. modeling) tools were or could be used?... Fish could be tagged and tracked
Future research
...What knowledge gaps remain?...
...Suggest a CWSP MS thesis topic that could contribute to the issue...
...Suggest a topic for a hypothetical study that had unlimited resources...
References
Fimrite, P. 2009. Crisis Situation for Marin's coho salmon. San Francisco Chronicle. 01092009 Section B1 ...Proust, M. 1901. Poetica nausea. J. Nauseum. pp 1-9999.
Disclaimer
This page may contain student work completed as part of assigned coursework. It may not be accurate. It does not necessary reflect the opinion or policy of CSUMB, its staff, or students.
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