Poor direct exploitation of terrestrial particulate organic material from peat layers by <i>Daphnia galeata</i>

Wenzel, Anja; Bergström, Ann‐Kristin; Jansson, Mats; Vrede, Tobias

doi:10.1139/f2012-110

Cited by 26 publications

(46 citation statements)

References 47 publications

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“…When fed 100% aged tPOM, less than half of the Daphnia survived, while none of those fed 100% fresh tPOM survived. Low survival of Daphnia with pure tPOM is in accordance with a previous study (Wenzel, Bergström, Jansson, & Vrede, ). Our results indicate that the aging improved the nutritional value of tPOM, but only enough to keep some of the Daphnia alive for the duration of the experiment.…”

Section: Discussionsupporting

confidence: 93%

“…Wenzel et al. () studied the performance of Daphnia galeata on a quantity gradient of mixed tPOM and algae (50/50%), and found that Daphnia growth rate increased only to food concentrations of 0.2 mg C/L, after which further increases in food quantity did not affect Daphnia growth rate during a 10‐day feeding trial. However, similar to our results, Daphnia reproductive output increased with increasing food quantity (up to c .…”

Section: Discussionmentioning

confidence: 99%

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Terrestrial organic matter quantity or decomposition state does not compensate for its poor nutritional quality for Daphnia

et al. 2019

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The importance of allochthonous organic matter contributions to aquatic food webs has long been debated. We studied the aging process of terrestrial particulate organic matter (tPOM) in aquatic ecosystems by incubating senescent plant material in the presence of natural microbial communities in either lake water or artificial growth medium. We hypothesised that the aging would change the biomarker composition of tPOM, and would improve its nutritional quality for Daphnia due to microbial conditioning. We also hypothesised that when algal availability is low, Daphnia can partially compensate for the low quality of tPOM when more of this resource is available to them. The fatty acid biomarkers of tPOM changed very little during short‐ and long‐term incubations. In particular, the proportion of long‐chain saturated fatty acids was quite stable even during long‐term incubations. A decrease in carbohydrate and ω‐3 polyunsaturated fatty acid content, and an increase in the bacterial and fungal lipid biomarkers indicated that microbial decomposition of tPOM took place during the incubation. The δ15N value of aged tPOM increased, which indicated microbial colonisation, while the δ13C value did not change during aging. Daphnia magna survival and reproductive output were low when fed diets containing fresh or aged tPOM. The reproductive output of Daphnia was slightly enhanced in the presence of aged tPOM as compared to fresh tPOM, but only when tPOM comprised ≥ 95% of the diet. When Daphnia were offered low (0.5 mg C/L) concentrations of algae, even high additions of tPOM (up to 15 mg C/L) did not increase Daphnia growth rates. Daphnia reproduction increased with tPOM additions, presumably due to the sterols and ω‐3 polyunsaturated fatty acid in the tPOM that Daphnia retained from their diet. Our results indicate that tPOM is a poor resource for pelagic cladocerans, even when aged in the presence of microbes or offered in large quantities.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Terrestrial organic matter quantity or decomposition state does not compensate for its poor nutritional quality for Daphnia

et al. 2019

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“…Although other studies have provided evidence that algae are the main basal source of PUFA to support consumer production in aquatic habitats (e.g., Brett et al 2009a, Lau et al 2009, Wenzel et al 2012, we are the first to show this relationship for consumers of different trophic levels and habitats and in lakes that receive large inputs of terrestrial DOM. Our data show that, on average, autochthonous sources contributed between 47% and 79% of the energy to the consumer taxa (when MOB d 13 C was set to À60%).…”

Section: Discussionmentioning

confidence: 46%

“…In contrast to other fatty acids that are catabolized, these PUFA are structurally important in cell membranes and play an important role in animal physiology such as growth and reproduction (Sargent et al 1995, Parrish 2009). Thus, the PUFA-rich photosynthetic auto-trophs are disproportionately important to consumers and are assimilated at a higher rate compared to the PUFA-deficient terrestrial resources (Brett et al 2009a, Wenzel et al 2012. Thus, the PUFA-rich photosynthetic auto-trophs are disproportionately important to consumers and are assimilated at a higher rate compared to the PUFA-deficient terrestrial resources (Brett et al 2009a, Wenzel et al 2012.…”

Section: Introductionmentioning

confidence: 99%

Autochthonous resources are the main driver of consumer production in dystrophic boreal lakes

Lau

Sundh

Vrede

et al. 2014

Ecology

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Dystrophic lakes are widespread in temperate regions and intimately interact with surrounding terrestrial ecosystems in energy and nutrient dynamics, yet the relative importance of autochthonous and allochthonous resources to consumer production in dystrophic lakes remains controversial. We argue that allochthonous organic matter quantitatively dominates over photosynthetic autotrophs in dystrophic lakes, but that autotrophs are higher in diet quality and more important for consumers as they contain essential polyunsaturated fatty acids (PUFA). In a field study, we tested the hypotheses that (1) autochthonous primary production is the main driver for consumer production, despite being limited by light availability and low nutrient supplies, and greater supply of allochthonous carbon, (2) the relative contribution of autotrophs to consumers is directly related to their tissue PUFA concentrations, and (3) methane-oxidizing bacteria (MOB) provide an energy alternative for consumers. Pelagic and benthic consumer taxa representing different trophic levels were sampled from five dystrophic lakes: isopod Asellus aquaticus, megalopteran Sialis lutaria, dipteran Chaoborus flavicans, and perch Perca fluviatilis. Based on carbon and nitrogen stable isotopes, the relative contributions of autochthonous (biofilms and seston) and allochthonous (coarse particulate and dissolved organic matter) resources and MOB to these taxa were 47-79%, 9-44% and 7-12% respectively. Results from fatty acid (FA) analyses show that the relative omega3-FA and PUFA concentrations increased with trophic level (Asellus < Sialis and Chaoborus < Perca). Also, eicosapentaenoic-acid (EPA), omega3-FA and PUFA concentrations increased with the autochthonous contribution in consumers, i.e., a 47-79% biofilm and/or seston diet resulted in tissue EPA of 4.2-18.4, omega3 FAs of 11.6-37.0 and PUFA of 21.6-61.0 mg/g dry mass. The results indicate that consumers in dystrophic lakes predominantly rely on energy from autotrophs and that their PUFA concentrations are dependent on the relative contribution of these autochthonous resources. The limited energy support from MOB suggests they are not negligible and are potentially an integral part of the food webs. Our findings show that autochthonous resources are the main driver of secondary production even in dystrophic lakes and offer new insights into the functioning of these ecosystems.

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“…2003; Jansson et al, 2007), as well as fuel CO 2 evasion from these systems (Algesten et al, 2004;Lapierre et al, 2013;Berggren et al, 2012), but the relative importance for those processes compared to that of autochthonous sources of organic C (Brett et al, 2009;Wenzel et al, 2012), or terrestrially derived CO 2 (Wallin et al, 2013;Butman and Raymond, 2011), respectively, is still questioned. This questioning largely emerges from unresolved issues concerning terrestrial organic carbon degradability in aquatic ecosystems, which then determines the ability of this carbon to enter aquatic food webs and biogeochemical cycles.…”

Section: J-f Lapierre and P A Del Giorgio: Patterns Of Degradablementioning

confidence: 99%

Partial coupling and differential regulation of biologically and photochemically labile dissolved organic carbon across boreal aquatic networks

Lapierre

Giorgio²

2014

Biogeosciences

157

100

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Abstract. Despite the rapidly increasing volume of research on the biological and photochemical degradation of DOC (dissolved organic carbon) in aquatic environments, little is known of the large-scale patterns in biologically and photochemically degradable DOC (BDOC and PDOC, respectively) in continental watersheds, and on the links that exist between these two key properties that greatly influence the flow of carbon from continents to oceans. Here we explored the patterns in the concentrations and proportions of BDOC and PDOC across hundreds of boreal lakes, rivers and wetlands spanning a large range of system trophic status and terrestrial influence, and compared the drivers of these two reactive pools of DOC at the landscape level. Using standardized incubations of natural waters, we found that the concentrations of BDOC and PDOC covaried across all systems studied but were nevertheless related to different pools of dissolved organic matter (DOM; identified by fluorescence analyses) in ambient waters. Concentrations of nutrients and protein-like fluorescent DOM (FDOM) explained nearly half of the variation in BDOC, whereas PDOC was exclusively predicted by DOM optical properties, consistent with the photochemical degradability of specific FDOM pools that we experimentally determined. The concentrations of colored DOM (CDOM), which we use here as a proxy of terrestrial influence, almost entirely accounted for the observed relationship between FDOM and the concentrations of both BDOC and PDOC. The concentrations of CDOM and of the putative biolabile fluorescence component shifted from complete decoupling in clear-water environments to strong coupling in darker streams and wetlands. This suggests a baseline autochthonous BDOC pool fueled by internal production that is gradually overwhelmed by land-derived BDOC as terrestrial influence increases across landscape gradients. The importance of land as a major source of both biologically and photochemically degradable DOC for continental watersheds resulted in a partial coupling of those carbon pools in natural freshwaters, despite fundamental contrasts in terms of their composition and regulation.

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Poor direct exploitation of terrestrial particulate organic material from peat layers by Daphnia galeata

Cited by 26 publications

References 47 publications

Terrestrial organic matter quantity or decomposition state does not compensate for its poor nutritional quality for Daphnia

Terrestrial organic matter quantity or decomposition state does not compensate for its poor nutritional quality for Daphnia

Autochthonous resources are the main driver of consumer production in dystrophic boreal lakes

Partial coupling and differential regulation of biologically and photochemically labile dissolved organic carbon across boreal aquatic networks

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