{"status": "Complete", "organizations": [{"category": "Academic", "logo_name": "09_20_38_65_EPSCoR_300x300.png", "name": "EPSCoR - Alaska Adapting to Changing Environments", "description": "Experimental Program to Stimulate Competitive Research - A nationwide research funding program administered by the National Science Foundation.    http://www.alaska.edu/epscor/"}, {"category": "Federal", "logo_name": "6jc8g1ukz3_NSF.png", "name": "National Science Foundation", "description": "The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 \"to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense\u2026\""}], "links": [{"url": "http://www.nrcresearchpress.com/doi/full/10.1139/cjfas-2014-0498#.V-sFgvkrKUm", "category": "Website", "display_text": "Publisher's website"}], "collections": [], "description": "Yukon River Chinook salmon (Oncorhynchus tshawytscha) populations are declining for unknown reasons, creating\r\nhardship for thousands of stakeholders in subsistence and commercial fisheries. An informed response to this crisis requires\r\nunderstanding the major sources of variation in Chinook salmon productivity. However, simple stock\u2013recruitment models leave\r\nmuch of the variation in this system\u2019s productivity unexplained. We tested adding environmental predictors to stock\u2013recruitment\r\nmodels for two Yukon drainage spawning streams in interior Alaska \u2014 the Chena and Salcha rivers. Low productivity was\r\nstrongly associated with high stream discharge during the summer of freshwater residency for young-of-the-year Chinook\r\nsalmon. This association was more consistent with the hypothesis that sustained high discharge negatively affects foraging\r\nconditions than with acute mortality during floods. Productivity may have also been reduced in years when incubating eggs\r\nexperienced major floods or cold summers and falls. These freshwater effects \u2014 especially density dependence and high\r\ndischarge \u2014 helped explain population declines in both rivers. They are plausible as contributors to the decline of Chinook\r\nsalmon throughout the Yukon River drainage.", "end_date": null, "title": "Low productivity of Chinook salmon strongly correlates with high summer stream discharge in two Alaskan rivers in the Yukon drainage", "other_contacts": [], "iso_topics": ["005", "007", "012"], "tags": ["Canada", "management", "Yukon Territory", "Environmental aspects", "United States", "chinook salmon", "Agricultural productivity", "alaska"], "bounds": [{"geom": "{\"type\":\"Polygon\",\"coordinates\":[[[-147.28379416226693,64.465],[-146.972,64.465],[-146.972,65.05728083719947],[-147.28379416226693,65.05728083719947],[-147.28379416226693,64.465]]]}", "type": "Attachment"}], "start_date": null, "regions": ["Alaska"], "other_agencies": "National Science Foundation", "data_types": [{"name": "Report", "description": null}], "archived_at": null, "primary_contacts": [{"phone": null, "name": "Gary Kofinas", "email": "ffsbb@uaf.edu"}], "type": {"color": "#c09853", "name": "Project", "description": "catalog record for projects with no associated data/observation files"}, "slug": "low-productivity-of-chinook-salmon-strongly-correlates-with-high-summer-stream-discharge-in-two-alaskan-rivers-in-the-yukon-drainage", "attachments": [{"category": "Geojson", "file_name": "imported_locations", "description": "gLynx locations", "file_size": 183}]}