Potential influences of a net-spinning caddisfly (Trichoptera:Stenopsyche marmorata) on stream substratum stability in heterogeneous field environments

Takao, Akira; Negishi, Junjiro N.; Nunokawa, Masanori; Gomi, Takashi; Nakahara, Osamu

doi:10.1899/0887-3593(2006)25[545:pioanc]2.0.co;2

Cited by 25 publications

(23 citation statements)

References 47 publications

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“…From this point of view, shredders serve as ecosystem engineers. Other invertebrates have also been shown to serve as ecosystem engineers in different contexts, from crayfish disturbing sediments by digging burrows (Statzner et al 2003) to net-building caddisfly larvae increasing bed stability by binding rocks together through construction of their silk nets (Takao et al 2006). Although the mechanisms of engineering we predicted, i.e.…”

Section: Sediment Effectsmentioning

confidence: 80%

“…Invertebrates have been proposed to act as ecosystem engineers in streams (Moore 2006). For example, net-spinning caddisflies have been demonstrated to increase the stability of benthic substrates, generating refugia for other species (Cardinale et al 2004;Takao et al 2006). Crayfish was found to decrease algal growth and increase eggs survival of fish due to direct erosion and to influence detritus decomposition, benthic diversity and particulate organic matter and fine sediment accumulation (Statzner et al 2000;Zhang et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Fine sediment on leaves: shredder removal of sediment does not enhance fungal colonisation

2011

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Inorganic fine sediments are easily carried into streams and rivers from disturbed land. These sediments can affect the stream biota, including detritivorous invertebrates (shredders) and impair ecosystem functions, such as leaf litter decomposition. We hypothesized that fine sediment (kaolin) deposited on leaves would reduce or suppress fungal development, reducing decomposition rates of leaves. Moreover, we predicted that shredders would act as ecosystem engineers by perturbing sediment deposition, reducing its impact on decomposition and fungi. We used a fully crossed experimental design of sediment addition (control, 400 mg L -1 ) and shredders (none, Gammarus, Potamophylax) in laboratory aquaria. Leaf mass loss, suspended solids, microbial respiration, fungal biomass and spore production were measured. Sediment addition had no significant effects on the leaf mass remaining nor on shredders' consumption rates. However, sediment slightly reduced fungal assemblage richness and the sporulation rate of three fungal species. The presence of shredders substantially increased the resuspension of fine sediments ([300%), resulting in higher suspended loads. However, the action of shredders did not have a significant effect on fungal biomass nor on leaf mass loss. Even if shredders did not enhance fungal colonisation, they affected the settlement of fine sediment, serving as allogenic engineers. Our study suggests that concentrations of fine sediment of 400 mg L -1 with short exposure times (192 h) can have some effect on leaf decomposition.

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Section: Sediment Effectsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Fine sediment on leaves: shredder removal of sediment does not enhance fungal colonisation

2011

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“…Takao et al (2006) suggested the potential influences of this caddisfly on substratum stability from a field observation. They revealed the force required to shift the particles inhabited by larval S. marmorata increased up to 260%.…”

Section: Discussionmentioning

confidence: 99%

The relationships between benthic macroinvertebrates and biotic and abiotic environmental characteristics downstream of the Yahagi Dam, Central Japan, and the State Change Caused by inflow from a Tributary

Takao

Kawaguchi

Minagawa

et al. 2008

River Research & Apps

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Anthropogenic modifications have disrupted aquatic ecosystems by modification of the flow regime and transport of sediment. The impacts of dams are believed to be very large, but, despite the abundance of dams in monsoonal Asia, great scientific uncertainty still exists about the effect of dams on macroinvertebrates. Therefore, we studied macroinvertebrate assemblages at three reaches (downstream of a dam, downstream of a confluence and on a tributary) of the Yahagi River, central Japan, to confirm the impact of long-term impoundment on the relationships between macroinvertebrate assemblages and biotic and abiotic environmental factors and also the role of a major tributary in community shift.Four Surber samples and associated physical measurements (depth, velocity and substrate composition) were taken from four study sites (riffles) at each study reach during the period from 10 to 21 February 2004. Drifting materials (zooplankton, POM and bedload sediment) and periphyton were also sampled. Significant differences were found in the macroinvertebrate fauna of these different reaches. Faunal distributions downstream of the dam were severely altered, with high macroinvertebrate abundance and low taxa richness in contrast to those in the tributary. The two-way indicator species analysis (TWINSPAN) classification clearly distinguished these samples from the others. Based on nonmetric multidimensional scaling (NMS) ordination and correlation analysis (environmental variables vs. NMS axis score), these differences in community structure reflected changes in substrate composition and quantity and quality of suspended and benthic FPOMs. Our observations suggest that while dam-derived zooplankton and reduced sediment transport had a great impact on the fauna, the tributary inflow, with a catchment size of less than 20% of that above the dam, acted as a major source of sediment input and facilitated macroinvertebrate community recovery.

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“…The importance of net-spinning caddisfly retreats to changes in the substrate environment have been demonstrated, adding to our understanding about the functional roles of caddisfly larvae in stream ecosystems (e.g., Statzner et al 1996;Cardinale et al 2004;Takao et al 2006;Tashiro and Tsujimoto 2006). The net-forming process of caddisflies inevitably causes consolidation of substrate particles, which may increase the coherent strength of streambed material.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of Hydropsyche larvae alters substrate scouring by floods from 1.7-to 2.5-year recurrence intervals (Cardinale et al 2004). Stenopsyche biomass around cobbles increases substrate stability in riffle reaches (Takao et al 2006).…”

Section: Introductionmentioning

confidence: 99%

A new method to measure substrate coherent strength of Stenopsyche marmorata

et al. 2008

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We developed a method for estimating the substrate coherent strength of a net-spinning caddis larva, Stenopsyche marmorata, in the field. Plastic experimental cages (prefabricated containers with 5-mm mesh; 0.1 m high, 0.12 m wide, 0.2 m long) that enclosed gravel substrate and an objective stone (5-6 cm in diameter) were prepared. We expected the caddisflies to build a retreat(s) between the objective stone and cage substrate when submerged in a riffle channel reach for 6 days. Ten final-instar larvae (4-5 cm long) were placed in the cage and allowed to form retreats. Two treatments (cages with and without larvae) with 15 replicates each were used in two experimental trials. The vertical lift-force of objective stones associated with a retreat (coherent strength) was measured using a spring weighing scale. In 87% of 30 cages of with-larvae treatment, retreats were formed between the objective stone and cage substrate. Coherent strength ranged from 0.0 to 1.6 kg. Our approach can be used under varying flow velocities, substrate conditions, and larval biomass, all of which are normally difficult to test in flume experiments. Findings based on our field method provide unique physical properties of the caddisfly retreats in stream ecosystems.

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Potential influences of a net-spinning caddisfly (Trichoptera:Stenopsyche marmorata) on stream substratum stability in heterogeneous field environments

Cited by 25 publications

References 47 publications

Fine sediment on leaves: shredder removal of sediment does not enhance fungal colonisation

Fine sediment on leaves: shredder removal of sediment does not enhance fungal colonisation

The relationships between benthic macroinvertebrates and biotic and abiotic environmental characteristics downstream of the Yahagi Dam, Central Japan, and the State Change Caused by inflow from a Tributary

A new method to measure substrate coherent strength of Stenopsyche marmorata

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