Influence of inorganic nitrogen cycling on the δ&lt;sup&gt;15&lt;/sup&gt;N of Lake Ontario biota

Leggett, M.F.; Johannsson, O.; Hesslein, R.; Dixon, D.G.; Taylor, W.D.; Servos, M.R.

doi:10.1139/cjfas-57-7-1489

Cited by 21 publications

(32 citation statements)

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“…This trend could stem from a number of biological processes, including variation in excretion and growth rates (Power et al, 2003) and, as has been suggested for the d 13 C, from variation in the signatures of ingested food in relation to nitrogen cycling (Leggett et al, 2000).…”

Section: Discussionmentioning

confidence: 83%

Distribution and ecology of Hemimysis anomala, the latest invader of the Great Lakes basin

et al. 2009

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Since 2006, the known distribution of Hemimysis anomala has greatly expanded in the Great Lakes ecosystem, with, to date, 45 sites of occurrence among 91 monitored sites, located in four of the Great Lakes and the upper St. Lawrence River. By means of carbon and nitrogen stable isotopes, a first assessment of the feeding ecology of Hemimysis was completed. The d 13 C values of 18 individuals collected in Lake Erie (Port Mainland) on a single date (Sept. 23, 2008) ranged from -30.2 to -24.5%, indicating that Hemimysis could feed on multiple carbon sources including pelagic and littoral autochthonous and terrestrial carbon. In Lake Erie, variation in d 13 C was related to d 15 N, indicating the importance of food source for determining the trophic position of Hemimysis. The d 15 N signatures of individuals were strongly related to their C/N ratios, suggesting that variations in the nutritional value of Hemimysis may depend on trophic position. Isotopic variation among individuals in Lake Erie was complemented by temporal variation in Lake Ontario. Monthly changes (from June to December 2008) in carbon isotope signatures were observed and related to changes in water temperature, highlighting the variations in the baseline prey signatures that fuel Hemimysis diets. The observed variation in stable isotope signatures occurring among individuals within a localized Hemimysis assemblage and temporally should be considered as a key design feature in further studies attempting to identify the possible effects of Hemimysis on nearshore food webs in the Great Lakes.

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Section: Discussionmentioning

confidence: 83%

Distribution and ecology of Hemimysis anomala, the latest invader of the Great Lakes basin

et al. 2009

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“…There were multiple time series for several of the better-studied taxa [e.g., Dreissena polymorpha (Bivalvia) = 3 studies, 4 time series; Chironomidae (Insecta) = 5 studies, 8 time series). The number of time series per major invertebrate group ranged from 22 to 62 (gastropod to zooplankton, respectively) with an average of 38 per group ( Leggett et al 2000). After removing zooplankton, the dataset included 130 time series (n = 393 data points per isotope) and the availability of time series data varied by feeding group, trophic state, and climate regime (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Variability and directionality of temporal changes in δ13C and δ15N of aquatic invertebrate primary consumers

et al. 2011

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Seasonal oscillations in the carbon (δ(13)C) and nitrogen (δ(15)N) isotope signatures of aquatic algae can cause seasonal enrichment-depletion cycles in the isotopic composition of planktonic invertebrates (e.g., copepods). Yet, there is growing evidence that seasonal enrichment-depletion cycles also occur in the isotope signatures of larger invertebrate consumers, taxa used to define reference points in isotope-based trophic models (e.g., trophic baselines). To evaluate the general assumption of temporal stability in non-zooplankton aquatic invertebrates, δ(13)C and δ(15)N time series data from the literature were analyzed for seasonality and the influence of biotic (feeding group) and abiotic (trophic state, climate regime) factors on isotope temporal patterns. The amplitude of δ(13)C and δ(15)N enrichment-depletion cycles was negatively related to body size, although all size-classes of invertebrates displayed a winter-to-summer enrichment in δ(13)C and depletion in δ(15)N. Among feeding groups, periphytic grazers were more variable and displayed larger temporal changes in δ(13)C than detritivores. For nitrogen, temporal variability and magnitude of directional change of δ(15)N was most strongly related to ecosystem trophic state (eutrophic > mesotrophic, oligotrophic). This study provides evidence of seasonality in the isotopic composition of aquatic invertebrates across very broad geographical and ecological gradients as well as identifying factors that are likely to modulate the strength and variability of seasonality. These results emphasize the need for researchers to recognize the likelihood of temporal changes in non-zooplankton aquatic invertebrate consumers at time scales relevant to seasonal studies and, if present, to account for temporal dynamics in isotope trophic models.

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“…The increase of the pelagic δ 13 C baseline probably reflects changes in phytoplankton carbon isotopic signature (Zohary et al 1994) consequent to changes in the availability of carbon sources with season, and the degree of fractionation during the uptake of dissolved inorganic carbon (DIC) for photosynthesis. Plankton collected during periods of high biomass and primary productivity tends to exhibit 13 C-enrichment (Degens et al 1968;Fry & Wainright 1991;Zohary et al 1994;France et al 1997) and thus heaviest (i.e., less negative) δ 13 C signatures, due to reduced isotopic fractionation at high cell densities or growth rates, or to a switch to use of HCO 3 -when CO 2 is depleted (France et al 1997;Leggett et al 1999Leggett et al , 2000. Lighter (i.e., more negative) δ 13 C signatures are again typically observed in the fall with gradual thermal de-stratification and resulting inputs of dissolved carbon from the hypolimnion, and lead to a seasonal minimum during winter mixing (Zohary et al 1994).…”

Section: Discussionmentioning

confidence: 99%

Seasonal changes in the δ13C and δ15N signatures of the Lago Maggiore pelagic food web

Visconti¹,

Manca²

2011

J Limnol

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Influence of inorganic nitrogen cycling on the δ<sup>15</sup>N of Lake Ontario biota

Cited by 21 publications

References 0 publications

Distribution and ecology of Hemimysis anomala, the latest invader of the Great Lakes basin

Distribution and ecology of Hemimysis anomala, the latest invader of the Great Lakes basin

Variability and directionality of temporal changes in δ13C and δ15N of aquatic invertebrate primary consumers

Seasonal changes in the δ13C and δ15N signatures of the Lago Maggiore pelagic food web

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