Herzog, QT; Tittgen, C; Laforsch, C: Predator specific reversibility of morphological defenses in Daphnia barbata, Journal of Plankton Research, 1-10 (2016), online: 20.06.2016, doi:10.1093/plankt/fbw045
Stichworte: Daphnia; inducible defenses; phenotypic plasticity; reversibility; morphological defenses; induced defenses; Daphnia barbata; Triops; Notonecta; morphological plasticity
Inducible defenses are a common phenotypically plastic response to a heterogeneous predation risk. Once induced, these defenses cannot only lose their benefit, but even become costly, should the predator disappear. Consequently, some organisms have developed the ability to reverse their defensive traits. However, despite extensive research on inducible defenses, reports on reversibility are rare and mostly concentrate on defensive behavior. In our study, we investigated the reversibility of morphological defenses in the freshwater crustacean Daphnia barbata. This species responds to Notonecta glauca and Triops cancriformis with two distinctively defended morphotypes. Within the numerous defensive traits, we found both trait- and predator-specific reversibility. Body torsion and tail-spine-related traits were highly reversible, whereas helmet-related traits remained stable, suggesting different physiological constraints. However, in general, we found the defenses against Triops mostly reversible, while Notonecta-induced defenses were persistent and grew further, even in the absence of a predator.
Aktuelle Termine

Do. 12.04.2018
Diversity and impact of invasive crayfish and crayfish plague: from Czechia to continental scale
Do. 19.04.2018
A new experiment to unravel the Impact of Biodiversity and Climate Variability on the functioning of grasslands
Do. 26.04.2018
Anticipating biome shifts
Ökologisch-Botanischer Garten:
So. 01.04.2018
April, April! Auch Pflanzen täuschen
So. 15.04.2018
Führung: Der ÖBG zum Kennenlernen: Allgemeine Gartenführung
Wetter Versuchsflächen
Luftdruck (356m): 960.6 hPa
Lufttemperatur: -2.2 °C
Niederschlag: 1.1 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 9.1 km/h
Wind (Max.): 22.3 km/h
Windrichtung: N

Globalstrahlung: 3 W/m²
Lufttemperatur: -5.4 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 6.8 km/h
Wind (Max.): 18.6 km/h