Correlation between allochthonous subsidy input and isotopic variability in the giant kelp Macrocystis pyrifera in central California, USA

Foley, Melissa M.; Koch, Paul L.

doi:10.3354/meps08600

Cited by 32 publications

(24 citation statements)

References 54 publications

(58 reference statements)

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“…For P. oceanica, the maximum photosynthetically active radiation above their canopies ranged from 50 to 310 mmol m −2 s −1 between the sampling locations and the coverage of leaf necrosis ranged from 0 to 37.5%. M. pyrifera samples were collected either in spring or late fall, periods of contrasting ocean conditions that result in widely divergent bulk isotopic values [18]. Note that our sampling was not designed for investigating the influence of geographical region on terrestrial plants since a previous study [14] found no systematic differences in δ 13 C AA patterns from greenhouse plants and those collected in boreal and mangrove ecosystems.…”

Section: Methodsmentioning

confidence: 99%

“…The terrestrial plant collection was supplemented with two species from public owned land in Denmark where no permission was required for sampling. We obtained five P. oceanica samples from the Catalonian shore in the Mediterranean Sea under a permit to Teresa Alcoverro by the Catalan Water Agency, and the five M. pyrifera samples from the Californian shore were sampled under a permit to Melissa M. Foley [18] by NOAA’s Monterey Bay National Marine Sanctuary. All field samples were kept on crushed ice in coolers and stored between 1 and 3 days before thoroughly washing them in milliQ water (except for animal and seston samples).…”

Section: Methodsmentioning

confidence: 99%

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Tracing Carbon Sources through Aquatic and Terrestrial Food Webs Using Amino Acid Stable Isotope Fingerprinting

et al. 2013

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Tracing the origin of nutrients is a fundamental goal of food web research but methodological issues associated with current research techniques such as using stable isotope ratios of bulk tissue can lead to confounding results. We investigated whether naturally occurring δ13C patterns among amino acids (δ13CAA) could distinguish between multiple aquatic and terrestrial primary production sources. We found that δ13CAA patterns in contrast to bulk δ13C values distinguished between carbon derived from algae, seagrass, terrestrial plants, bacteria and fungi. Furthermore, we showed for two aquatic producers that their δ13CAA patterns were largely unaffected by different environmental conditions despite substantial shifts in bulk δ13C values. The potential of assessing the major carbon sources at the base of the food web was demonstrated for freshwater, pelagic, and estuarine consumers; consumer δ13C patterns of essential amino acids largely matched those of the dominant primary producers in each system. Since amino acids make up about half of organismal carbon, source diagnostic isotope fingerprints can be used as a new complementary approach to overcome some of the limitations of variable source bulk isotope values commonly encountered in estuarine areas and other complex environments with mixed aquatic and terrestrial inputs.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Tracing Carbon Sources through Aquatic and Terrestrial Food Webs Using Amino Acid Stable Isotope Fingerprinting

et al. 2013

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“…There are reports that the latter is highly variable among individuals, and even within a single blade (Stephenson et al 1984, Dunton & Schell 1987. For a given macroalgal species, the isotope signature can be affected by many factors such as depth, light partitioning, and nutrient availability (Foley & Koch 2010, Hepburn et al 2011. Although active tidal hydrodynamics most likely prevent nutrient limitation in the Roscoff area (Wafar et al 1983), light levels may have influenced the isotopic signal because high variation in light is expected particularly in kelp forest strata (Norton et al 1977 Senescent red algae associated with the kelp forest appeared to decay in November until new growth commenced before March and continued to June-September.…”

Section: Organic Matter Sources Of the Kelp Forestmentioning

confidence: 99%

Temporal variation in organic matter supply in kelp forests: linking structure to trophic functioning

Leclerc¹,

Riera²,

Leroux³

et al. 2013

Mar. Ecol. Prog. Ser.

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International audienceOwing to their productivity, kelps may be the main primary carbon source for consumers in coastal areas. Their contribution has often been compared to that of phytoplankton, but the potential involvement of the red algae associated with kelp forests has been overlooked. All these 3 primary sources have distinct life cycles and may contribute to the particulate organic matter pool differently according to season. In the present study, we characterised the trophic structure of a pristine Laminaria hyperborea forest off the coast of Brittany (France) in terms of the organic carbon biomass of the main primary producers and consumer trophic groups on 4 sampling dates over a 1 yr period. Senescence of many red algae species occurred during their resting period (i.e. before November), whereas the kelp regrowth period (i.e. before March) was accompanied by the fragmentation of old lamina. During these periods, when phytoplankton biomass is comparable, stable isotope analyses (delta C-13 and delta N-15) were conducted in an attempt to link structure to trophic functioning. By combining analyses of temporal variability in primary source and consumer isotopic ratios and using mixing models, we inferred changes in the trophic significance of macroalgae in the associated food web. Decaying kelp laminae were a major contributor to the particulate organic matter pool, and the fragmentation of old lamina promoted their contribution to the diet of deposit-and suspension-feeders in March. Growth of red algae enhanced direct grazer consumption in March, while their senescence contributed significantly to primary consumer diets in November via indirect consumption

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“…the exact diet of the simulated consumer); and (2) the standard assumptions were used (the model is given fresh macrophyte isotope values as potential food input data). 'Fresh' Saccharina was represented by Week 1 scraped blades, as 'fresh' samples are frequently scrubbed or scraped and then rinsed to remove epibionts (Guest et al 2008, Page et al 2008, Foley & Koch 2010. Fresh Saccharina was verified as isotopically distinct from all other sources before the analysis ( Table S3 in the Supplement at www.intres.com/articles/suppl/m494p107_supp.…”

Section: Model Sourcesmentioning

confidence: 99%

Isotopic evidence and consequences of the role of microbes in macroalgae detritus-based food webs

Sosik¹,

Simenstad²

2013

Mar. Ecol. Prog. Ser.

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Deep subtidal coastal food webs are increasingly a focus among coastal researchers, largely due to the reliance of these systems on subsidies of organic detritus donated from allochthonous sources. To better understand the dynamics of these food webs, researchers have frequently employed multiple stable isotope (MSI; δ 13 C, δ 15 N, δ 34 S) analysis to gain insights into the relative importance and origins of various sources of detritus. However, the role of microbial decomposition in these detritus-based food webs has been poorly quantified and frequently overlooked in MSI food web mixing models. In this study, we explicitly examined the ecological and MSI methodological effects of microbial decomposition of algal detritus. We found a relationship between δ 15 N enrichment and microbial abundance on decomposing kelp blades, and evidence that this pattern is influenced by the underlying biochemistry of the kelp. C:N ratios supported the hypothesis that microbial biofilms utilize nitrogen from kelp detritus, rather than augment the detrital nitrogen content. The results also showed that microbial effects can introduce a nonnegligible amount of error to MSI mixing models if left unquantified.KEY WORDS: Detritus · δ 15 N · Microbes · Isotopes · Kelp · Food webs · δ 13 C · δ 34 S Resale or republication not permitted without written consent of the publisher Editorial responsibility: Just Cebrian,

show abstract

Correlation between allochthonous subsidy input and isotopic variability in the giant kelp Macrocystis pyrifera in central California, USA

Cited by 32 publications

References 54 publications

Tracing Carbon Sources through Aquatic and Terrestrial Food Webs Using Amino Acid Stable Isotope Fingerprinting

Tracing Carbon Sources through Aquatic and Terrestrial Food Webs Using Amino Acid Stable Isotope Fingerprinting

Temporal variation in organic matter supply in kelp forests: linking structure to trophic functioning

Isotopic evidence and consequences of the role of microbes in macroalgae detritus-based food webs

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