globalchange  > 过去全球变化的重建
DOI: 10.1002/eap.1880
WOS ID: WOS:000474122100016
Title:
Warm, dry winters truncate timing and size distribution of seaward-migrating salmon across a large, regulated watershed
Author: Munsch, Stuart H.1; Greene, Correigh M.2; Johnson, Rachel C.3,4; Satterthwaite, William H.3; Imaki, Hiroo1; Brandes, Patricia L.5
Corresponding Author: Munsch, Stuart H.
Source Publication: ECOLOGICAL APPLICATIONS
ISSN: 1051-0761
EISSN: 1939-5582
Publishing Year: 2019
Volume: 29, Issue:4
Language: 英语
Keyword: dams ; drought ; flow ; migration ; nursery ; phenology ; reservoirs ; salmonids ; snow ; temperature mitigation ; thermal tolerance
WOS Keyword: CLIMATE-CHANGE ; CHINOOK SALMON ; MATCH-MISMATCH ; LIFE-HISTORY ; TEMPERATURE ; GROWTH ; IMPACTS ; RIVER ; CONSERVATION ; MANAGEMENT
WOS Category: Ecology ; Environmental Sciences
WOS Research Area: Environmental Sciences & Ecology
English Abstract:

Ecologists are pressed to understand how climate constrains the timings of annual biological events (phenology). Climate influences on phenology are likely significant in estuarine watersheds because many watersheds provide seasonal fish nurseries where juvenile presence is synched with favorable conditions. While ecologists have long recognized that estuaries are generally important to juvenile fish, we incompletely understand the specific ecosystem dynamics that contribute to their nursery habitat value, limiting our ability to identify and protect vital habitat components. Here we examined the annual timing of juvenile coldwater fish migrating through a seasonally warm, hydrologically managed watershed. Our goal was to (1) understand how climate constrained the seasonal timing of water conditions necessary for juvenile fish to use nursery habitats and (2) inform management decisions about (a) mitigating climate-mediated stress on nursery habitat function and (b) conserving heat-constrained species in warming environments. Cool, wet winters deposited snow and cold water into mountains and reservoirs, which kept the lower watershed adequately cool for juveniles through the spring despite the region approaching its hot, dry summers. For every 1 degrees C waters in April were colder, the juvenile fish population (1) inhabited the watershed 4-7 d longer and (2) entered marine waters, where survival is size selective, at maximum sizes 2.1 mm larger. Climate therefore appeared to constrain the nursery functions of this system by determining seasonal windows of tolerable rearing conditions, and cold water appeared to be a vital ecosystem component that promoted juvenile rearing. Fish in this system inhabit the southernmost extent of their range and already rear during the coolest part of the year, suggesting that a warming climate will truncate rather than shift their annual presence. Our findings are concerning for coldwater diadromous species in general because warming climates may constrain watershed use and diminish viability of life histories (e.g., late springtime rearing) and associated portfolio benefits over the long term. Lower watershed nurseries for coldwater fish in warming climates may be enhanced through allocating coldwater reservoir releases to prolong juvenile rearing periods downstream or restorations that facilitate colder conditions.


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Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/138796
Appears in Collections:过去全球变化的重建

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Affiliation: 1.NOAA, Ocean Associates Inc, Northwest Fisheries Sci Ctr, Natl Marine Fisheries Serv, 2725 Montlake Blvd East, Seattle, WA 98112 USA
2.NOAA, Fish Ecol Div, Northwest Fisheries Sci Ctr, Natl Marine Fisheries Serv, 2725 Montlake Blvd Eest, Seattle, WA 98112 USA
3.NOAA, Fisheries Ecol Div, Southwest Fisheries Sci Ctr, Natl Marine Fisheries Serv, 110 McAllister Way, Santa Cruz, CA 95060 USA
4.Univ Calif Davis, Ctr Watershed Sci, 1 Shields Ave, Davis, CA 95616 USA
5.US Fish & Wildlife Serv, 850 S Guild Ave,Suite 105, Lodi, CA 95240 USA

Recommended Citation:
Munsch, Stuart H.,Greene, Correigh M.,Johnson, Rachel C.,et al. Warm, dry winters truncate timing and size distribution of seaward-migrating salmon across a large, regulated watershed[J]. ECOLOGICAL APPLICATIONS,2019-01-01,29(4)
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