Food habits of invertebrate grazers in a forested stream: variations according to taxonomic affiliation, flow habitat, and body size

Tamura, Shigeaki; Kagaya, Takashi

doi:10.1007/s10750-019-04010-5

Cited by 5 publications

(4 citation statements)

References 41 publications

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“…Large‐sized vertebrates (predators, omnivores, herbivores and detritivores) may substantially influence ecosystem functioning, such as primary production, decomposition and nutrient cycling, directly via nutrient provisioning through faeces and carcass deposition, or indirectly, by altering the diversity of other trophic groups (Atkinson et al., 2017; McIntyre et al., 2007). Invertebrate omnivores (such as macroinvertebrates) are responsible for processing large amounts of plant and animal detritus (Tamura & Kagaya, 2019), which may determine the amount of resources and functional rates in the aquatic food web, influencing decomposition rates and nutrient cycling. The diversity of small invertebrates (such as small‐sized filter feeders, small omnivores and carnivores, or phagotrophic protists) is fundamental to maintain multiple functions and energy flow within the aquatic food webs.…”

Section: Introductionmentioning

confidence: 99%

Multitrophic richness enhances ecosystem multifunctionality of tropical shallow lakes

et al. 2021

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The role of multitrophic diversity in sustaining multiple functions simultaneously (multifunctionality) is still poorly understood in natural communities, especially in highly diverse aquatic ecosystems. Existing studies have focused on the effect of single trophic group on ecosystem function and on individual ecosystem functions, neglecting the fact that multiple trophic groups are needed to maintain ecosystem multifunctionality. Here, using a 16‐year database from tropical shallow lakes, we combined species richness of nine single trophic group into a unique measurement of multitrophic richness. We then investigated the influence of the richness within separate single trophic group and in a multitrophic context on ecosystem multifunctionality. We also investigated how removal of any single trophic group influence the effect of the multitrophic richness on multifunctionality; and how the interactions among multiple single trophic group affect multifunctionality. We showed that the multitrophic richness had a stronger positive effect on multifunctionality than the richness of single trophic group. The removal of each single trophic group decreased the effect of the multitrophic richness on multifunctionality. The larger predatory vertebrates and primary producers had stronger positive effects on multifunctionality, but the richness of basal trophic groups fuelled the large‐sized predators, thus indirectly contributing to increase multifunctionality. Our study highlights the need for preserving multiple trophic groups to sustain multifunctionality in highly diverse aquatic ecosystems; thus, trophic degradation of the ecosystems should strongly impair their functioning. A free Plain Language Summary can be found within the Supporting Information of this article.

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Section: Introductionmentioning

confidence: 99%

Multitrophic richness enhances ecosystem multifunctionality of tropical shallow lakes

et al. 2021

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“…In another study, macroinvertebrates ingested fewer diatoms and more fine particulate organic matter in low-flow than in rapid-flow areas (Tamura & Kagaya, 2019). Furthermore, grazer-periphyton interactions may not only be context-dependent, but also vary across taxonomic groups.…”

Section: Introductionmentioning

confidence: 96%

“…For example, Prochilodus mariae Eigenmann, a detritivorous fish, was found to affect sediment accrual in pools, but not in riffles (Flecker, 1997). In another study, macroinvertebrates ingested fewer diatoms and more fine particulate organic matter in low‐flow than in rapid‐flow areas (Tamura & Kagaya, 2019). Furthermore, grazer–periphyton interactions may not only be context‐dependent, but also vary across taxonomic groups.…”

Section: Introductionmentioning

confidence: 99%

“…The strength of grazing pressure may depend on the habitat type in question. This is because streams are heterogeneous in depth, water flow, near‐bed current, substratum composition and sediment deposition (Heino et al, 2015), potentially affecting the performance of different grazer species (Flecker, 1997; Leitão et al, 2015; Tamura & Kagaya, 2019) and controlling algal assembly (Passy & Larson, 2019; Wagenhoff et al, 2013; Wellnitz & Poff, 2012). For example, Prochilodus mariae Eigenmann, a detritivorous fish, was found to affect sediment accrual in pools, but not in riffles (Flecker, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Effects of mesohabitat, grazing and substratum roughness on locally common and rare diatom species

2023

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Habitat type and grazing are key factors controlling benthic diatom communities. Nonetheless, the strength of grazing may depend on the habitat complexity at fine (substratum roughness) and meso scales (mesohabitat type). The interaction between grazers and physical conditions may thus be an important factor shaping benthic diatom communities. Several investigations have evaluated how habitat type, grazing and substratum roughness separately affect the biomass, species richness and community structure of algal communities. However, how these factors act together remains poorly understood, particularly for sets of common and rare species. The latter is important for understanding whether common and rare species are affected differently by environmental filters at the local scale. We investigated the effects of mesohabitat type, grazer occurrence and substratum roughness as well as their interactions on benthic diatom communities in a split‐split‐plot field experiment consisting of hierarchical treatments: (i) mesohabitat (pools and riffles); (ii) grazer occurrence (presence or absence of grazers >1 cm in size); and (iii) substratum roughness (smooth and rough substrata). We analysed the entire community and also datasets of common and rare species. Here, we define common and rare species based on their abundance–occupancy relationships, with rare species presenting low mean abundance per experimental unit (between 0.025 and 8.2) and low occupancy (between 2.5% and 25%). Substratum roughness was the main factor explaining differences in species richness, with higher species richness found on rough than on smooth substrata for both the complete dataset and for common and rare species. There was evidence that the interactions between mesohabitat and grazer occurrence and between mesohabitat and substratum roughness affected community structure (relative abundances) for the complete dataset and for common species, whereas the three‐way interaction between mesohabitat, grazer and substratum roughness affected community structure of rare species. Our findings emphasise that crevices are important microhabitats that allow the establishment of both common and rare species. Furthermore, our results suggest that physical differences between mesohabitats influenced the effect of grazers on the community structure of common and rare species. For common species, the effects of this interaction were difficult to depict, but we found a change in the second‐most‐common species between mesohabitats and depending on the occurrence of grazers. For rare species, grazers more clearly affected community structure on smooth substrata in riffles than in pools. Our results demonstrate that local patterns of common and rare diatom species resulted from distinct combinations of the evaluated environmental filters. Together, our results highlight how multifactorial field experiments are key to understanding the main environmental filters driving the species richness and community structure of benthic diatom communities.

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Complementary information from fatty acid and nutrient stoichiometry data improve stream food web analyses

Torres-Ruiz

Wehr

2019

Hydrobiologia

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Food habits of invertebrate grazers in a forested stream: variations according to taxonomic affiliation, flow habitat, and body size

Cited by 5 publications

References 41 publications

Multitrophic richness enhances ecosystem multifunctionality of tropical shallow lakes

Multitrophic richness enhances ecosystem multifunctionality of tropical shallow lakes

Effects of mesohabitat, grazing and substratum roughness on locally common and rare diatom species

Complementary information from fatty acid and nutrient stoichiometry data improve stream food web analyses

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