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  Finding the optimal vertical distribution: behavioural responses of Daphnia pulicaria to gradients of environmental factors and the presence of fish

Larsson, P., & Lampert, W. (2012). Finding the optimal vertical distribution: behavioural responses of Daphnia pulicaria to gradients of environmental factors and the presence of fish. Freshwater Biology, 57(12), 2514-2525. doi:10.1111/fwb.12024.

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Datensatz-Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-0CA8-B Versions-Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-0CA9-9
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Larsson_2012.pdf (Verlagsversion), 692KB
 
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 Urheber:
Larsson, Petter1, Autor              
Lampert, W.2, Autor              
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Emeritus Group Lampert, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445636              

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Schlagwörter: Daphnia; environmental gradients; fitness optimisation; predation; vertical distribution
 Zusammenfassung: 1. The vertical distribution of zooplankton results from active habitat choice aiming to optimise fitness gain in a system of trade-offs. 2. Using large, controlled indoor mesocosms (Plo¨n Plankton Towers), we monitored the behavioural response of Daphnia pulicaria to vertical gradients of temperature, food, oxygen and light, in the presence and absence of fish predation. 3. In the absence of fish, Daphnia distributed as predicted by an ideal ‘free distribution with costs’. If the food was distributed homogeneously, they stayed in the warm epilimnion, while they balanced their time dwelling in epi- and hypolimnion if the food was concentrated in a deep-water maximum. 4. However, oxygen depletion in the hypolimnion, representing an additional cost, prevented Daphnia from completely exploiting the hypolimnetic food maximum. Consequently, the proportion dwelling in the hypolimnion was larger if oxygen was not limiting. 5. Fish predation had an overwhelming effect, driving Daphnia into the hypolimnion under all experimental conditions. If permitted by oxygen availability, Daphnia used the whole hypolimnion, but oxygen depletion reduced their possible habitat to the upper hypolimnion with oxygen concentrations above c. 0.7 mg L)1. As fish were less tolerant of low oxygen, the layer below the thermocline formed a predation refuge for Daphnia

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Sprache(n): eng - Englisch
 Datum: 2012-09-262012-12
 Publikationsstatus: Im Druck veröffentlicht
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 Identifikatoren: DOI: 10.1111/fwb.12024
Anderer: 2952/S 39297
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Titel: Freshwater Biology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford, Eng. : Blackwell Scientific Publications.
Seiten: - Band / Heft: 57 (12) Artikelnummer: - Start- / Endseite: 2514 - 2525 Identifikator: ISSN: 0046-5070 (print)
ISSN: 1365-2427 (online)
CoNE: /journals/resource/954925455964