The plasma composition of larval Aeshna cyanea müller—III. The effect of different external media and temperature on the free amino acids

Herzog, Hans-Ulrich; Liappis, Nikolas

doi:10.1016/0300-9629(87)90147-2

Cited by 1 publication

(1 citation statement)

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“…Amino acids are abundant in tissues of marine and freshwater invertebrates (Sutcliffe, 1962;Firling, 1977;Edwards, 1982;Herzog and Liappis, 1987;Carr et al, 1996;Zimmer et al, 1999), and they act as feeding stimulants/ attractants for diverse predatory species (Carter and Steele, 1982;Carr, 1988;Valentincic and Captrio, 1994;Coman et al, 1996;Hara, 2006;Keiichiro et al, 2006). In the present study, worm (Eisenia rosea Gates 1942) prey of adult newts (Taricha torosa Rathke 1883) were collected on three occasions (April 14, August 26 and October 12, 2004) from natural streamside sediments at the field study site.…”

Section: Amino Acid Analysis Of Worm Body Fluidsmentioning

confidence: 99%

Chemosensory reception, behavioral expression, and ecological interactions at multiple trophic levels

Ferrer

Zimmer

2007

Journal of Experimental Biology

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SUMMARY Chemoreception may function throughout an entire animal lifetime, with independent, stage-specific selection pressures leading to changes in physiological properties, behavioral expression, and hence, trophic interactions. When the California newt (Taricha torosa) metamorphoses from an entirely aquatic larva to a semi-terrestrial juvenile/adult form, its chemosensory organs undergo dramatic reorganization. The relationship between newt life-history stage and chemosensory-mediated behavior was established by comparing responses of adults (as determined here) to those of conspecific larvae (as studied previously). Bioassays were performed in mountain streams,testing responses of free-ranging adults to 13 individual l-amino acids. Relative to stream water (controls), adults turned immediately upcurrent and moved to the source of arginine, glycine or alanine release. These responses were indicative of predatory search. Arginine was the strongest attractant tested, with a response threshold (median effective dose)of 8.3×10–7 mol l–1 (uncorrected for dilution associated with chemical release and delivery). In contrast to adult behavior, arginine suppressed cannibal-avoidance and failed to evoke search reactions in larvae. For a common set of arginine analogs, the magnitudes of adult attraction and larval suppression were not positively correlated. Suppression of cannibal-avoidance behavior in larvae was unaffected by most structural modifications of the arginine molecule. Adult behavior, on the other hand, was strongly influenced by even subtle alterations in the parent compound. Reactions to arginine in both adults and larvae were eliminated by blocking the external openings of the nasal cavity. Stimulating adult predatory search in one case and inhibiting larval cannibal avoidance in the other, arginine is a chemical signal with opposing behavioral effects and varying ecological consequences. Significant differences between responses of adults and larvae to changes in arginine structure suggest alternative, chemosensory receptor targets. Although arginine reception functions throughout an entire newt lifetime, an ontogenetic shift in larval and adult chemoreceptive ability changes behavioral expression, and thus, reflects the unique selection pressures that act at each life-history stage.

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