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

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 packmore » 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).« less

Authors:
 [1];  [2];  [3];  [1]
  1. Brigham Young Univ., Provo, UT (United States). Dept. of Biology
  2. Savannah River Ecology Lab., Aiken, SC (United States)
  3. Univ. of Oregon, Charleston, OR (United States). Oregon Inst. of Marine Biology
Publication Date:
Research Org.:
Savannah River Ecology Lab., Aiken, SC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1423921
Alternate Identifier(s):
OSTI ID: 1433411; OSTI ID: 1505141
Grant/Contract Number:  
FC09-96SR18546
Resource Type:
Published Article
Journal Name:
Ecosphere
Additional Journal Information:
Journal Volume: 9; Journal Issue: 3; Journal ID: ISSN 2150-8925
Publisher:
Ecological Society of America
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 54 ENVIRONMENTAL SCIENCES; ecosystem linkages; marine consumers eat red alder leaves; rocky intertidal consumers; terrestrial organic matter

Citation Formats

Fairbanks, Douglas O., McArthur, J. Vaun, Young, Craig M., and Rader, Russell B. Consumption of terrestrial organic matter in the rocky intertidal zone along the central Oregon coast. United States: N. p., 2018. Web. doi:10.1002/ecs2.2138.
Fairbanks, Douglas O., McArthur, J. Vaun, Young, Craig M., & Rader, Russell B. Consumption of terrestrial organic matter in the rocky intertidal zone along the central Oregon coast. United States. doi:10.1002/ecs2.2138.
Fairbanks, Douglas O., McArthur, J. Vaun, Young, Craig M., and Rader, Russell B. Tue . "Consumption of terrestrial organic matter in the rocky intertidal zone along the central Oregon coast". United States. doi:10.1002/ecs2.2138.
@article{osti_1423921,
title = {Consumption of terrestrial organic matter in the rocky intertidal zone along the central Oregon coast},
author = {Fairbanks, Douglas O. and McArthur, J. Vaun and Young, Craig M. and Rader, Russell B.},
abstractNote = {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/m2) on some beaches to the primary source of detritus on others (256 g AFDM/m2). 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).},
doi = {10.1002/ecs2.2138},
journal = {Ecosphere},
number = 3,
volume = 9,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1002/ecs2.2138

Figures / Tables:

Figure 1 Figure 1: Map of sites near Coos Bay in southern Oregon (USA) showing the streams used to quantify terrestrial organic matter in the drift (open circles) and the pocket bays where beach wrack was sampled and where our feeding experiments were conducted (closed circles).

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