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    Glacier runoff influences biogeochemistry and resource availabilityin coastal temperate rainforest streams: Implications for juvenile salmon growth

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    2022 Fellman, Hood 2022 _Limnology ...
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    Author
    Fellman, Jason B.
    Bellmore, J. Ryan
    Johnson, Connor
    Dunkle, Matthew R.
    Hood, Eran
    Keyword
    glacier runoff
    biogeochemistry
    coastal temperate rainforest
    juvenile salmon
    stream habitat
    watersheds
    Metadata
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    URI
    http://hdl.handle.net/11122/13153
    Abstract
    Meltwater contributions to watersheds are shrinking as glaciers disappear, altering theflow, temperature, andbiogeochemistry of freshwaters. A potential consequence of this landscape change is that streamflow patternswithin glacierized watersheds will become more homogenous, potentially altering the capacity of watersheds tosupport Pacific salmon. To assess heterogeneity in stream habitat quality for juvenile salmon in a watershed inthe Alaska Coast Mountains, we collected organic matter and invertebrate drift and measured streamwater phys-ical and biogeochemical properties over the main runoff season in two adjacent tributaries, one fed mainly byrain and the other partially by glacier ice/snowmelt. We then used bioenergetic modeling to evaluate how tem-poral patterns in water temperature and invertebrate drift in each tributary influence juvenile salmon growthpotential. Across the study period, average invertebrate drift concentrations were similar in non-glacierizedMontana (0.33 mg m 3) and glacier-influenced McGinnis Creeks (0.38 mg m 3). However, seasonal patterns ofinvertebrate drift were temporally asynchronous between the two streams. Invertebrate drift and modeledfishgrowth were generally higher in McGinnis Creek in the spring and Montana Creek in the Summer. For juvenilesalmon, tracking these resource asynchronies by moving between tributaries resulted in 20% greater growththan could be obtained within either stream alone. These results suggest that hydrologic heterogeneity withinwatersheds may enhance the diversity of foraging and growth opportunities for mobile aquatic organisms,which may be essential for supporting productive and resilient natural salmon runs.
    Date
    2022-10-01
    Publisher
    Association for the Sciences of Limnology and Oceanography
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Fellman, J. B., Bellmore, J. R., Johnson, C., Dunkle, M. R., & Hood, E. (2022). Glacier runoff influences biogeochemistry and resource availability in coastal temperate rainforest streams: Implications for juvenile salmon growth. Limnology and Oceanography, 68(1), 70–83. https://doi.org/10.1002/lno.12251
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    Hood, Eran

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