Abstract
Filter feeding zooplankton are a crucial component of limnic food webs. Copepods and cladocerans are important prey organisms for first-level predators like the common and abundant larvae of phantom midges (Chaoborus sp.). The latter possess a complex catching basket built of head appendages specialized to capture small crustaceans. The predator-prey-relationship of Chaoborus (Diptera, Nematocera) and Daphnia (Crustacea, Cladocera) has been studied in particular detail owing to the daphniids’ ability to react upon the threat of predation with inducible defenses. Daphnia pulex expresses so-called ‘neckteeth’ in the presence of Chaoborus larvae that are discussed as a defensive trait that interferes with the larval head appendages and their effectiveness has been shown in several studies. Nonetheless, mode of function of these neckteeth is not understood and the hypothesis that they interfere with the predator’s head appendages still has to be confirmed. To clarify the role of neckteeth in Daphnia, an understanding of the Chaoborus capture apparatus is essential. Here, we present a detailed three-dimensional analysis of Chaoborus obscuripes’ larval head morphology as well as a kinematic analysis of the attack motion, which revealed an impressive strike velocity (14 ms to prey contact). The movement of the larvae’s head appendages is reconstructed in the three-dimensional space using a combination of high-speed videography, micro-computed tomography and computer animation. Furthermore, we provide predation trial data to distinguish between pre- and post-attack defensive effects in D. pulex. Our findings suggest a combination of pre- and post-attack defenses with an average effectiveness of 50% each. With this study, we quantitatively describe prey capture kinematics of C. obscuripes and take a further step to reveal the neckteeth’ mode of function in D. pulex.
Highlights
Most lentic ecosystems are organized in multi-level food webs
We quantitatively describe prey capture kinematics of C. obscuripes and take a further step to reveal the neckteeth’ mode of function in D. pulex
Chaoborus larvae hatch from eggs deposited in freshwater habitats
Summary
Most lentic ecosystems are organized in multi-level food webs. Herbivorous zooplankters, feeding on primary producers, are the first level of consumers followed by first-level predators. As Chaoborus is a typical inhabitant of freshwaters world-wide, these larvae can be regarded as a central component of aquatic food webs [2] While they serve as an important food source for higher trophic levels including many fish species, the larvae themselves prey on ciliates, copepods, and cladocerans [3]. They are ambush predators that hold their position in the water column using two pairs of tracheal gas sacs for buoyancy correction [4]. Prey capture is accomplished with the help of a uniquely-formed catching basket This catching basket is formed by the larval head appendages functioning in concert. Whereas the individual morphological structures have been described in detail, the successive movements and their functional relation, have remained speculative [8]
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