The Dietary Importance of Kelp-Derived Detritus to Pelagic and Benthic Consumers along the West Coast of Vancouver Island, Canada  

作　　者：Brock Christopher Ramshaw Evgeny Alexandrovich Pakhomov Brock Christopher Ramshaw;Evgeny Alexandrovich Pakhomov(101-108 Esplanade W, North Vancouver, Canada;Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada;Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, Canada;Hakai Institute, Campbell River, Canada)

机构地区：[1]101-108 Esplanade W, North Vancouver, Canada [2]Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada [3]Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, Canada [4]Hakai Institute, Campbell River, Canada

出　　处：《Open Journal of Marine Science》2021年第4期187-213,共27页海洋科学期刊（英文）

摘　　要：Stable isotope analysis was used to determine the relative dietary importance of kelp-derived detritus to plankton and benthic organisms along a gradient of kelp abundance driven by recovering sea otter populations along the west coast of Vancouver Island (WCVI), Canada. The study used region-specific kelp isotope values (<i>δ</i>¹³C and <i>δ</i>¹⁵N) and season-specific phytoplankton isotope values to model dietary contributions of kelp-derived detritus (KDD). In general, KDD contributions were moderate to high in most plankton size fractions during the summer and decreased during the winter, particularly in the kelp sparse region. Hypothesized regional and spatial (distance from the coast) differences in kelp detritus contributions to zooplankton w<span style="white-space:normal;"><span style="font-family:;" "="">ere</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> not evident. Modeled estimates of the KDD contribution to benthic invertebrates w</span></span><span style="white-space:normal;"><span style="font-family:;" "="">ere</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> high (>40%) and independent of the organism size, among regions and between seasons, with the exception of <i>Astraea gibberosa</i> in the kelp abundant region. Local oceanography, natural kelp isotope signature variation, and significant overlap between kelps’ and blooming phytoplankton isotope values led to a large uncertainty in the assessed KDD contributions in benthic organisms. These results highlighted the importance of the KDD as a widespread and stable year-round food source in coastal kelp populated regions.</span></span>Stable isotope analysis was used to determine the relative dietary importance of kelp-derived detritus to plankton and benthic organisms along a gradient of kelp abundance driven by recovering sea otter populations along the west coast of Vancouver Island (WCVI), Canada. The study used region-specific kelp isotope values (<i>δ</i>¹³C and <i>δ</i>¹⁵N) and season-specific phytoplankton isotope values to model dietary contributions of kelp-derived detritus (KDD). In general, KDD contributions were moderate to high in most plankton size fractions during the summer and decreased during the winter, particularly in the kelp sparse region. Hypothesized regional and spatial (distance from the coast) differences in kelp detritus contributions to zooplankton w<span style="white-space:normal;"><span style="font-family:;" "="">ere</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> not evident. Modeled estimates of the KDD contribution to benthic invertebrates w</span></span><span style="white-space:normal;"><span style="font-family:;" "="">ere</span></span><span style="white-space:normal;"><span style="font-family:;" "=""> high (>40%) and independent of the organism size, among regions and between seasons, with the exception of <i>Astraea gibberosa</i> in the kelp abundant region. Local oceanography, natural kelp isotope signature variation, and significant overlap between kelps’ and blooming phytoplankton isotope values led to a large uncertainty in the assessed KDD contributions in benthic organisms. These results highlighted the importance of the KDD as a widespread and stable year-round food source in coastal kelp populated regions.</span></span>

关 键 词：Kelp-Derived Detritus Primary Production Stable Isotopes Vancouver Island Particulate Organic Matter KELP Benthic Organisms Primary Consumers Food Web 

分 类 号：P73[天文地球—海洋科学]