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Title of Journal: Hydrobiologia

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Abbravation: Hydrobiologia

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The effects of top-down and bottom-up controls on macroinvertebrate assemblages in headwater streams

Authors: Thayse Nery, Dénes Schmera,

Publish Date: 2015/06/17
Volume: 763, Issue:1, Pages: 173-181
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Headwater stream macroinvertebrates play an important role in processing allochthonous leaf litter, which suggests that bottom-up forces control macroinvertebrates. However, because larvae of stream-breeding salamanders are predators of macroinvertebrates and are abundant consumers in these ecosystems, macroinvertebrates in fishless headwater streams might also be controlled by top-down forces through predation by salamander larvae. The aim of this study was to test if and to what degree taxa richness, abundance, and biomass of macroinvertebrates are affected by bottom-up and top-down forces. We selected headwater streams with high abundances of fire salamander larvae (1.2–2.6 individuals per 1 m of shore length) and manipulated bottom-up and top-down forces on macroinvertebrates by leaf litter addition and by the exclusion of salamander larvae. The amphipod Gammarus fossarum Koch, 1836 was the dominant taxon and responded positively to litter addition. Linear models showed that neither predator exclusion nor leaf litter addition affected richness. However, variation in biomass and density were both explained by the individual and joint effects of bottom-up and top-down forces. These findings suggest that macroinvertebrates in these streams are strongly dependent on the organic matter input and salamander larvae, and headwater streams interact strongly with their adjacent terrestrial areas.We thank Dr. Benedikt Schmidt (University of Zurich) for providing information about the distribution salamander larvae, Peter Tanner (Abteilung Natur und Landschaft, Kanton Baselland, Schweiz) for permitting the collection of macroinvertebrates in the studied streams, and Prof. Dr. Lee Kats and four anonymous reviewers for their comments on the manuscript. We thank Dr. Krystyna Haq and Dr. Jo Edmondston for checking the English in the manuscript.



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Other Papers In This Journal:

  1. The effects of top-down and bottom-up controls on macroinvertebrate assemblages in headwater streams
  2. Phosphorus fractions and alkaline phosphatase activity in sediments of a large eutrophic Chinese lake (Lake Taihu)
  3. Interactions between nutrient availability and climatic fluctuations as determinants of the long-term phytoplankton community changes in Lake Garda
  4. Importance of underwater light field in selecting phytoplankton morphology in a eutrophic reservoir
  5. Dynamics of microbial planktonic food web components during a river flash flood in a Mediterranean coastal lagoon
  6. Chironomid species are sensitive to sugarcane cultivation
  7. Dormancy and dispersal as mediators of zooplankton population and community dynamics along a hydrological disturbance gradient in inland temporary pools
  8. Drift of stream invertebrates below a cave source
  9. Absence of negative allelopathic effects of cylindrospermopsin and microcystin-LR on selected marine and freshwater phytoplankton species
  10. Biogeochemical modelling of Ria Formosa (South Portugal)
  11. Global biodiversity of Scorpionflies and Hangingflies (Mecoptera) in freshwater
  12. Global biodiversity of Scorpionflies and Hangingflies (Mecoptera) in freshwater
  13. Characteristics of the pelagic phytoplankton in shallow oxbows
  14. Characterization of the waterbird communities wintering in Tunisian coastal lagoons
  15. Cultivating the climate: socio-economic prospects and consequences of climate-friendly peat land management in Germany
  16. Changes in microphytobenthos fluorescence over a tidal cycle: implications for sampling designs
  17. The fuzzy index of ecosystem integrity (FINE): a new index of environmental integrity for transitional ecosystems
  18. A fully implantable multi-channel biotelemetry system for measurement of blood flow and temperature: a first evaluation in the green sturgeon
  19. Are prokaryotic cell shape and size suitable to ecosystem characterization?
  20. Global diversity of hymenopterans (Hymenoptera; Insecta) in freshwater
  21. Phytoplankton composition and periodicity in a northeastern Quebec lake
  22. Present state of the systematics of planktonic coccoid green algae of inland waters
  23. Alteration of essential fatty acids in secondary consumers across a gradient of cyanobacteria
  24. The effect of environmental factors on circulation and respiration in teleost fish
  25. Surfacing activity and food utilisation in the obligatory air-breathing fish ophiocephalus striatus as a function of body weight
  26. The taxonomic and ecological status of the environmentally restricted Spongillid species of North America. II. Anheteromeyenia biceps (Lindenschmidt
  27. Effects of freshwater input on nutrient loading
  28. Long term changes in the benthic communities of Loch Linnhe and Loch Eil (Scotland)
  29. The cyclopoid copepods of a wet campo marsh in central Brazil

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