Rotifer communities under variable predation-turbulence combinations
| Autor: | Laura Härkönen, Zeynep Pekcan-Hekim, Jukka Horppila, Anne Ojala, Noora Hellén, Satu Estlander |
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| Přispěvatelé: | Ecosystems and Environment Research Programme, Helsinki Institute of Sustainability Science (HELSUS), Lake Ecosystem Dynamics, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre (ViPS), Anne Ojala / Principal Investigator, Ecosystem processes (INAR Forest Sciences), Faculty of Agriculture and Forestry, Institute for Atmospheric and Earth System Research (INAR) |
| Rok vydání: | 2018 |
| Předmět: |
INVERTEBRATE PREDATORS
0106 biological sciences IMPACT media_common.quotation_subject Predation ENCOUNTER RATES Rotifer Aquatic Science 010603 evolutionary biology 01 natural sciences Competition (biology) FOOD-WEB MANIPULATION Abundance (ecology) Rotifers Chaoborus flavicans 14. Life underwater BODY-SIZE Invertebrate media_common biology Ecology 010604 marine biology & hydrobiology Aquatic ecosystem 15. Life on land Plankton biology.organism_classification Turbulence SHALLOW LAKE ZOOPLANKTON COMMUNITY 1181 Ecology evolutionary biology PLANKTON CHAOBORUS-FLAVICANS CLEARANCE RATES |
| Zdroj: | Hydrobiologia. 828:339-351 |
| ISSN: | 1573-5117 0018-8158 |
| Popis: | The effects of water turbulence on rotifer communities were experimentally studied under different predation pressures. When the larvae of the phantom midge (Chaoborus flavicans) were present in turbulent water, the abundance of most rotifer taxa was enhanced. Especially the genera Chromogaster, Keratella, Polyarthra, and Trichocerca, increased in abundance. In calm water, chaoborids did not affect the rotifer community. In turbulent water predation by chaoborids was targeted more towards cladocerans (Bosmina sp.) and predation pressure on rotifers was relaxed. Additionally, reduced competition with cladocerans probably contributed to the increase of rotifer abundance. Turbulence alone had no significant effect on rotifer abundance because their individual size was small compared with the diameter of the turbulent eddies. The study suggested that the effects of turbulence on rotifers is not direct but takes place through changed predator-prey relations, i.e., the effect depends on the abundance of invertebrate predators. In aquatic ecosystems with a high density of chaoborids, increasing turbulence can considerably increase the abundance of rotifers. |
| Databáze: | OpenAIRE |
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