TY  - JOUR
A1  - Pasternak, Zohar
A1  - Blasius, Bernd
A1  - Abelson, Avigdor
A1  - Achituv, Yair
T1  - Host-location in flow by larvae of the symbiotic barnacle Savignium dentatum using odor-gated rheotaxis
N2  - The detection and location of specific organisms in the aquatic environment, whether they are mates, prey or settlement sites, are two of the most important challenges facing aquatic animals. Large marine invertebrates such as a lobster have been found to locate specific organisms by navigating in the plume of chemicals emitted by the target. However, active plume tracking in flow by small organisms such as a marine larvae has recieved little scientific attention. Here, we present results from a study examining host location in flow by nauplius larvae of the barnacle Trevathana dentata, which inhabits the stony reef coral Cyphastrea chalcidicium.The experiments included analysis of larval motion in an annular flume under four conditions: (i) still water, (ii) in flow, (iii) in still water with waterborne host metabolites and (iv) in flow with host metabolites. Our results show that T. dentata nauplii are unable to locate their target organism in still water using chemotaxis, but are capable of efficient host location in flow using odour-gated rheotaxis. This technique may enable host location by earlier, less-developed larval stages.
Y1  - 2004
UR  - http://www.agnld.uni-potsdam.de/~bernd/papers/ProcRoySoc4.pdf
ER  - 
TY  - JOUR
A1  - Pasternak, Zohar
A1  - Blasius, Bernd
A1  - Abelson, Avigdor
T1  - Host location by larvae of a parasitic barnacle: larval chemotaxis and plume tracking in flow
N2  - Numerous studies describe stimulation and/or enhancement of larval settlement by distance chemoreception in response to chemical factors emitted by conspecific adults, host and prey species and microbial films. However, active upstream tracking of odor plumes, needed in order to locate specific, spatially limited settlement sites, has thus far recieved little scientific attention. This study examines host location in flow and still water by larvae of the parasitic barnacle Heterosaccus dollfusi, which inhabits the brachyuran crab Charybdis longicollis. Experiments included analysis of larval motion patterns under four conditions: still water, in flow, in still water with waterborn host metabolites and in flow with host metabolites. Our results show that the H. dollfusi larvae are capable of actively and effectively locating their host in still water and in flow, using chemotaxis and rheotaxis and modifying their swimming pattern, direction, velocity, determination and turning rate to accommodate efficient navigation in changing environmental conditions.
Y1  - 2004
UR  - http://www.agnld.uni-potsdam.de/~bernd/papers/JPlankR1.pdf
ER  - 
TY  - JOUR
A1  - Pasternak, Zohar
A1  - Blasius, Bernd
A1  - Abelson, Avigdor
A1  - Achituv, Yair
T1  - Host-finding behaviour and navigation capabilities of symbiotic zooxanthellae
N2  - Past studies have shown that the initiation of symbiosis between the Red-Sea soft coral Heteroxenia fuscescens and its symbiotic dinoflagellates occurs due to the chemical attraction of the motile algal cells to substances emanating from the coral polyps. However, the resulting swimming patterns of zooxanthellae have not been previously studied. This work examined algal swimming behaviour, host location and navigation capabilities under four conditions: (1) still water, (2) in still water with waterborne host attractants, (3) in flowing water, and (4) in flow with host attractants. Algae were capable of actively and effectively locating their host in still water as well as in flow. When in water containing host attractants, swimming became slower, motion patterns straighter and the direction of motion was mainly towards the host-even if this meant advancing upstream against flow velocities of up to 0.5 mm s(-1)supercript stop. Coral-algae encounter probability decreased the further downstream of the host algae were located, probably due to diffusion of the chemical signal. The results show how the chemoreceptive zooxanthellae modify their swimming pattern, direction, velocity, circuity and turning rate to accommodate efficient navigation in changing environmental conditions
Y1  - 2006
UR  - http://www.springerlink.com/content/100407
U6  - https://doi.org/10.1007/s00338-005-0085-2
ER  -