Seasonality in lake pelagic 15N values: patterns, possible explanations, and implications for food web baselines

Syväranta, Jari; Tiirola, Marja; Jones, Roger

doi:10.1127/1863-9135/2008/0172-0255

Cited by 30 publications

(37 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is unclear why d 15 N signatures were so high for Holopedium and all zooplankton in low DOC, Blue Chalk Lake. The enriched d 15 N signatures of all zooplankton may indirectly be a consequence of nitrogen enrichment in surface waters that can occur during summer and autumn (Bode and Alvarez-Ossorio 2004;Cifuentes et al 1988, Syvaranta et al 2008 or upward movement of enriched nitrogen resulting from microbial denitrification in the hypolimnion (O'Reilly et al 2002). We were able to correct for this by using the DOM baseline correction.…”

Section: Isotopic Valuesmentioning

confidence: 99%

Differences in zooplankton feeding rates and isotopic signatures from three temperate lakes

Persaud

Dillon

2010

Aquat Sci

View full text Add to dashboard Cite

Bacteria and phytoplankton are integral in the mobilization and transfer of organic matter to higher trophic levels. Hence, we examined their role in zooplankton diets and assessed trends in their nitrogen isotopic variability. We performed feeding experiments with natural particulate organic matter (POM) and four zooplankton groups (Daphnia, Holopedium, large calanoids and small calanoids) to (1) examine whether there are differences in consumption (presented as clearance and ingestion rates) of phytoplankton and bacteria, and (2) determine whether differences in zooplankton clearance and ingestion rates are correlated with their d 15 N isotopic signatures. In general, phytoplankton and bacteria clearance rates and biomass ingested per animal varied significantly among different zooplankton groups within lakes and between lakes for a given zooplankton group. Within a given lake, Daphnia and Holopedium had the highest phytoplankton and bacteria clearance and ingestion rates, followed by large calanoids, and then small calanoids. For a given zooplankton group, bacteria and phytoplankton clearance rates varied among lakes. In contrast, phytoplankton ingestion rates were consistently highest in Dickie Lake for all taxa, whereas bacteria ingestion rates were more variable among lakes for the different zooplankton taxa. The percentage contribution of different phytoplankton taxa to the biomass of phytoplankton ingested also varied significantly among lakes for a given taxa, but there were few differences within a given lake among zooplankton. Zooplankton d 15 N DOMC values were correlated with their size adjusted phytoplankton and bacteria clearance and ingestion rates. The correlations were stronger with (1) phytoplankton compared to bacteria, and (2) clearance rates compared to ingestion rates of biomass. Together our results suggest that zooplankton taxa with low phytoplankton and bacteria clearance and ingestion rates and higher d 15 N DOMC are likely exploiting food sources from higher trophic levels.

show abstract

Section: Isotopic Valuesmentioning

confidence: 99%

Differences in zooplankton feeding rates and isotopic signatures from three temperate lakes

Persaud

Dillon

2010

Aquat Sci

View full text Add to dashboard Cite

show abstract

“…Previous studies have revealed that d 15 N POM varies over time in individual lakes (Gu et al, 1994(Gu et al, , 2006Lehmann et al, 2004;Syva¨ranta et al, 2008;Hadas et al, 2009). Several studies have compared d 15 N POM among lakes.…”

Section: Introductionmentioning

confidence: 99%

“…These processes often involve large isotope fractionation (Owens, 1987). The use of the remaining substrates or the resulting products may dramatically affect phytoplankton isotope composition (Syva¨ranta et al, 2008;Hadas et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Patterns and controls of nitrogen stable isotopes of particulate organic matter in subtropical lakes

Schelske

2010

Ann. Limnol. - Int. J. Lim.

View full text Add to dashboard Cite

-Nitrogen stable isotope composition (d 15 N) of particulate organic matter (POM) has been used to infer dominant nitrogen cycling processes in lakes. However, very few studies have compared the isotope variations in lakes along trophic state and other biogeochemical gradients. Here we report an analysis of d 15 N POM and selected environmental variables from 96 subtropical lakes to assess the patterns and controls of isotope variations. Results indicate that d 15 N POM values varied from x 2.8 to 13.2‰ and were not significantly correlated with total phosphorus (TP), total nitrogen (TN) and chlorophyll a (Chl a). The 15 N depletion in POM was found across the entire trophic gradient and likely reflected contributions from planktonic nitrogen fixation. The 15 N enrichment was attributed to high primary production and the contributions of anthropogenic wastes in eutrophic lakes, and the presence of microzooplankton in the water samples of the oligotrophic lakes. The d 15 N POM was negatively correlated with water color and positively correlated with pH. Because water color is indicative of light availability which affects phytoplankton growth and pH is significantly correlated with Chl a concentration in the study lakes, the close relationship between water color, pH and d 15 N POM therefore suggests primary productivity-driven isotope fractionation. Results from this study did not reveal the importance of trophic state, nitrogen concentration and surface area to the variations of d 15 N POM and points to the complex interactions of nitrogen cycling processes in lakes with diverse biogeochemical features.

show abstract

“…The change between anoxic and oxic conditions during the water-land transition and the availability of large amounts of organic material favor denitrification, which would also lead to higher δ 15 N values for BOM [40]. Rooted species could obtain nitrogen, phosphorus, calcium and other key nutrients from the sediment [42].…”

mentioning

confidence: 99%

“…Initial seston 15 N composition is established by the composition of phytoplankton and their variations in assimilation ability of isotopically distinct dissolved inorganic nitrogen (DIN) [33,39]. For example, NH 4 + is considerably 15 N-enriched (20‰-30‰) compared with NO 3 − (<10‰) [33,40]. The proportion of cyanobacteria in the phytoplankton biomass increased in the wet season at Poyang Lake and further contributed to the decrease in the seston δ 15 N value, because cyanobacteria can directly use atmospheric N 2 and have low stable nitrogen isotope fractionation [34,39].…”

mentioning

confidence: 99%

Potential influence of water level changes on energy flows in a lake food web

Wang

et al. 2011

Chin. Sci. Bull.

View full text Add to dashboard Cite

Large seasonal water-level fluctuations may influence isotopic signatures of primary producers and the types and amounts of these potential food sources accessible to aquatic fauna of Poyang Lake, the largest freshwater lake in China. In this study, the isotopic signatures of primary producers and consumers were determined, stable carbon and nitrogen isotope analysis and mixing models were combined to investigate the influence of water levels on the diet and isotopic composition of Poyang Lake fish and invertebrates. Five potential food sources (seston, benthic organic matter, aquatic macrophytes, attached algae, and terrestrial plants), 4 species of invertebrates, and 10 species of fish were collected from the lake area during dry and wet seasons between January

show abstract

Seasonality in lake pelagic 15N values: patterns, possible explanations, and implications for food web baselines

Cited by 30 publications

References 41 publications

Differences in zooplankton feeding rates and isotopic signatures from three temperate lakes

Differences in zooplankton feeding rates and isotopic signatures from three temperate lakes

Patterns and controls of nitrogen stable isotopes of particulate organic matter in subtropical lakes

Potential influence of water level changes on energy flows in a lake food web

Contact Info

Product

Resources

About