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Title: Consumption of terrestrial organic matter in the rocky intertidal zone along the central Oregon coast

Journal Article · · Ecosphere
DOI:https://doi.org/10.1002/ecs2.2138· OSTI ID:1423921
 [1];  [2];  [3];  [1]
  1. Department of Biology Brigham Young University Provo Utah 84602 USA
  2. Savannah River Ecology Laboratory Drawer E Aiken South Carolina 29801 USA
  3. Oregon Institute of Marine Biology University of Oregon P.O. Box 5389 Charleston Oregon 97420 USA

Abstract Terrestrial organic matter ( TOM ) constitutes an important source of energy in many aquatic environments. This is the first study to compare the consumption of terrestrial leaves ( Alnus rubra ) to high‐quality ( Nereocystis luetkeana ) and low‐quality ( Fucus gardneri ) sources of drift kelp and low‐quality seagrass ( Phyllospadix spp.) in pools of the rocky intertidal zone on Cape Arago, Oregon, USA . On average, 1.02 kg ash‐free dry mass ( AFDM ) per day of TOM was transported by small forested streams during fall leaf abscission to the rocky intertidal zone in small pocket bays. Leaves of A. rubra (red alder) varied in wrack from negligible (12 g  AFDM /m 2 ) on some beaches to the primary source of detritus on others (256 g  AFDM /m 2 ). Long‐term feeding experiments (months) showed that consumption rates of A. rubra in the spring (19.7% of the initial pack biomass) and in the fall (52% of the initial pack biomass) were intermediate between those of N. luetkeana (fully consumed) and Phyllospadix spp. (never >10% consumed of the initial pack biomass). Long‐term experiments also showed that conditioned fall‐shed leaves of A. rubra were consumed at a faster rate (52.3% of initial pack biomass) than spring‐shed leaves of A. rubra (16.8% of initial pack biomass). Short‐term feeding experiments again showed that consumption of A. rubra in the spring (18.6% of initial pack biomass over 3 d) and fall (16.7% over 7 d) was intermediate between N. luetkeana (57.3% consumed over 3 d in the spring and 60.7% over 7 d in the fall) and Phyllospadix spp. (<1% consumed in the spring). Except for Phyllospadix spp., consumption rates followed polyphenolic concentrations in that, N. luetkeana (418 mg/mL) >  A. rubra (3415 mg/mL) >  F. gardneri (8098 mg/mL). Phyllospadix spp. was rarely consumed despite a fairly low concentration of phenolics (800 mg/mL). In the temperate zone, leaves of A .  rubra may constitute an important source of energy during the fall and winter when more nutritious marine resources dieback, such as single‐celled algae and kelp (e.g., N. luetkeana ).

Research Organization:
Savannah River Ecology Lab., Aiken, SC (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐FC09‐96SR18546; FC09-96SR18546
OSTI ID:
1423921
Alternate ID(s):
OSTI ID: 1433411; OSTI ID: 1505141
Journal Information:
Ecosphere, Journal Name: Ecosphere Vol. 9 Journal Issue: 3; ISSN 2150-8925
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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Figures / Tables (15)