Effects of alder- and salmon-derived nutrients on aquatic bacterial community structure and microbial community metabolism in subarctic lakes View Full Text


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Article Info

DATE

2022-06-23

AUTHORS

Denise A. Devotta, Angela D. Kent, David M. Nelson, Patrick B. Walsh, Jennifer M. Fraterrigo, Feng Sheng Hu

ABSTRACT

Alder (Alnus spp.) and Pacific salmon (Oncorhynchus spp.) provide key nutrient subsidies to freshwater systems. In southwestern Alaska, alder-derived nutrients (ADNs) are increasing as alder cover expands in response to climate warming, while climate change and habitat degradation are reducing marine-derived nutrients (MDNs) in salmon-spawning habitats. To assess the relative influences of ADN and MDN on aquatic microbial community structure and function, we analyzed lake chemistry, bacterial community structure, and microbial metabolism in 13 lakes with varying alder cover and salmon abundance in southwestern Alaska. We conducted bioassays to determine microbial nutrient limitation and physical factors modulating microbial response to nutrient inputs (+N, +P and +NP treatments). Seasonal shifts in bacterial community structure (F = 7.47, P < 0.01) coincided with changes in lake nitrogen (N) and phosphorus (P) concentrations (r2 = 0.19 and 0.16, both P < 0.05), and putrescine degradation (r2 = 0.13, P = 0.06), suggesting the influx and microbial use of MDN. Higher microbial metabolism occurred in summer than spring, coinciding with salmon runs. Increased microbial metabolism occurred in lakes where more salmon spawned. Microbial metabolic activity was unrelated to alder cover, likely because ADN provides less resource diversity than MDN. When nutrients were added to spring samples, there was greater substrate use by microbial communities from lakes with elevated Chl a concentrations and large relative catchment areas (β estimates for all treatments > 0.56, all P < 0.07). Thus, physical watershed and lake features mediate the effects of nutrient subsidies on aquatic microbial metabolic activity. More... »

PAGES

711-724

References to SciGraph publications

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  • 2007-05-01. Synchrony in aquatic microbial community dynamics in THE ISME JOURNAL: MULTIDISCIPLINARY JOURNAL OF MICROBIAL ECOLOGY
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  • 2010-08-27. Phosphorus retention as a function of external loading, hydraulic turnover time, area and relative depth in 54 lakes and reservoirs in HYDROBIOLOGIA
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/s00442-022-05207-7

    DOI

    http://dx.doi.org/10.1007/s00442-022-05207-7

    DIMENSIONS

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/35739283


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    67 input
    68 lake chemistry
    69 lake features
    70 lake nitrogen
    71 lakes
    72 limitations
    73 marine-derived nutrients
    74 metabolic activity
    75 metabolism
    76 microbial communities
    77 microbial community metabolism
    78 microbial community structure
    79 microbial metabolic activity
    80 microbial metabolism
    81 microbial nutrient limitation
    82 microbial responses
    83 microbial use
    84 more salmon
    85 nitrogen
    86 nutrient inputs
    87 nutrient limitation
    88 nutrient subsidies
    89 nutrients
    90 phosphorus concentrations
    91 physical factors
    92 putrescine degradation
    93 relative influence
    94 resource diversity
    95 response
    96 run
    97 salmon
    98 salmon abundance
    99 salmon runs
    100 salmon-derived nutrients
    101 samples
    102 seasonal shifts
    103 shift
    104 southwestern Alaska
    105 spring
    106 structure
    107 subarctic lakes
    108 subsidies
    109 substrate use
    110 summer
    111 system
    112 use
    113 warming
    114 watersheds
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