The Role of Lipids, Fungi, and Temperature in the Nutrition of a Shredder Caddisfly, Clistoronia magnifica

Cargill, Austen S.; Cummins, Kenneth W.; Hanson, Boyd J.; Lowry, Robert R.

doi:10.2307/1467178

Cited by 47 publications

(17 citation statements)

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“…Cargill et al (1985a, b) suggested that lipids in colonized detritus were responsible for this preference. However, our study has demonstrated that total FA content of leaves actually decreased with time in the Muscoot River, and that essential PUFAs, such as 18:3x3, were preferentially degraded and practically lost after the initial 30 days in this stream.…”

Section: Discussionmentioning

confidence: 99%

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Changes in the nutritional quality of decaying leaf litter in a stream based on fatty acid content

Torres-Ruiz

Wehr

2010

Hydrobiologia

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We examined the nutritional quality of decaying leaf litter in a third-order forested stream, using measurements of fatty acid (FA) composition over time. We measured changes in concentrations of total, polyunsaturated, microalgal, and microbial marker FAs in mixed-species leaf packs in spring and autumn and effects of including/excluding macroinvertebrates. Initial concentrations of total FAs in litter were significantly less in spring (5.2 mg/g) than in autumn (6.9 mg/g; F = 6.3; P = 0.03), but total FA concentrations in litter placed in the stream declined significantly over 120 days in both spring (62%; F = 10.9; P \ 0.001) and autumn (56%; F = 19.4; P = 0.0001). Quantities of most FAs declined at a greater rate than that of bulk leaf matter. The presence or absence of macroinvertebrates (5 mm vs. 250 lm mesh) had no effect on FA concentration or composition of decomposing litter. Omega-3 polyunsaturated FAs were either nearly absent (20:5x3) or depleted preferentially over other FAs (18:3x3). During decomposition the polyunsaturated FA linoleic acid (18:2x6, common in fungi), declined in concentration more rapidly than other FAs in the spring, but in autumn declined at slower rates, perhaps suggesting greater fungal activity in autumn. Quantities of bacterial (e.g., 16:1x7) and fungal (e.g., 18:1x9) FA markers increased over time in autumn (and 16:1x7 also in spring). Our data provide no evidence for increasing nutritional FA quality of litter during decay and microbial colonization, based on total and polyunsaturated FAs, despite measured increases in bacterial and fungal FA over time. Routine measurements of FA composition of litter could provide insights into the nutrition of allochthonous matter and the importance of fungi and bacteria during decomposition.

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Section: Discussionmentioning

confidence: 99%

“…Colonized or conditioned detritus is more readily eaten and assimilated by stream invertebrates and promotes better growth than sterile leaf material (Barlocher & Kendrick, 1975;Fuller & Fry, 1991). Microbial lipids could be responsible for this preference (Cargill et al, 1985a, b).…”

Section: Introductionmentioning

confidence: 99%

Changes in the nutritional quality of decaying leaf litter in a stream based on fatty acid content

Torres-Ruiz

Wehr

2010

Hydrobiologia

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“…As in earlier studies (CARGILL et al, 1985a;CARGILL et al, 1985b;RONG et al, 1995), we cultured the oomycete and the fungi in a synthetic medium with sucrose prior to extraction. The finding that none of the extracts were attractive to G. roeselii led us to postulate that growth on sucrose in a synthetic medium might result in the absence of attractants.…”

Section: Discussionmentioning

confidence: 99%

The Impact of Fungal Extracts on Leaf Litter on the Food Preference of Gammarus roeselii

Aßmann

Elert

2009

International Review of Hydrobiology

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We investigated the effect of methanol and methanol/methylene chloride extracts of the oomycete Pythium sp. JN 1-b and of the fungi Ascomycete sp. PVSo8, Fusarium sporotrichoides, and Cylindrocarpon sp. 94-2057 on the food preference of Gammarus roeselii. The preference for leaf discs coated with these extracts compared to uncoated leaf discs was tested in food-choice assays. Methanol extracts of all strains repelled G. roeselii, and the effect of the extract concentration on relative consumption was strain specific. The repellent effect of these extracts, especially of extracts of Cylindrocarpon sp., decreased when the fungi were grown on leaf extract medium as opposed to synthetic medium containing sucrose. None of the methanol/methylene chloride extracts affected the food preference of the gammarid. We conclude that biologically active compounds were extracted from fungi and an oomycete were soluble in methanol but not in methanol/methylene chloride. Only repellent activity was observed with the extracts, and relative ratios of repellents and attractants might determine the consumption of fungi by G. roeselii.

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“…A previous study has shown that the final instar of the limnephilid caddisfly, Clistoronia magnifica (Banks), needs to accumulate triglycerides for reproductive success (Cargill et al, 1985b). The final instars of trichopteran caddisfly shredders preferentially consumed alder leaf-disks coated with lipids, especially unsaturated 18-and 20-carbon fatty acids (either as free acids or in triglycerides), which were extracted from aquatic hyphomycetes.…”

Section: Introductionmentioning

confidence: 99%

Effects of aquatic fungi on feeding preferences and bioenergetics of Pycnopsyche gentilis (Trichoptera: Limnephilidae)

Chung

Suberkropp

2009

Hydrobiologia

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Previous studies which have tested the feeding preferences of shredders for fungal species and the food quality of fungi used detritus uniformly colonized by a fungus, which is not the case for decaying leaves in streams. It is not known whether shredders in different development stages exhibit variations in feeding preference and larval performance. This study examined the feeding preferences and the growth of the third and the fifth instars of Pycnopsyche gentilis larvae using fungal-colonized patches and whole leaves, respectively, having different fungal species compositions (Alatospora acuminata, Anguillospora filiformis, Articulospora tetracladia, Tetrachaetum elegans, and all species combined). The aquatic hyphomycetes used were codominant on leaves in the stream inhabited by the caddisfly. During 14 d of feeding, the larvae of both instars did not show significant differences in feeding preferences for the patches growing on oak leaves, although the third instar larvae were slightly more selective than the fifth instar larvae. When fed with maple leaves for 18 d, larval growth rates, gross growth efficiencies, and survivorship were not significantly different among the fungal treatments. However, the larval growth of both instars fed with fungal-colonized leaves was always significantly greater than the growth of larvae fed with diets of uncolonized leaves. The third instar larvae grew faster than the fifth instar larvae, but the growth efficiencies of the two instars were similar. These results suggest that P. gentilis larvae exhibit less selectivity in their feeding than other caddisfly shredders that have been examined and that the dominant fungi colonizing leaves in their habitat are similar in palatability and food quality for this shredder.

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The Role of Lipids, Fungi, and Temperature in the Nutrition of a Shredder Caddisfly, Clistoronia magnifica

Cited by 47 publications

References 0 publications

Changes in the nutritional quality of decaying leaf litter in a stream based on fatty acid content

Changes in the nutritional quality of decaying leaf litter in a stream based on fatty acid content

The Impact of Fungal Extracts on Leaf Litter on the Food Preference of Gammarus roeselii

Effects of aquatic fungi on feeding preferences and bioenergetics of Pycnopsyche gentilis (Trichoptera: Limnephilidae)

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