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Titolo:
Postingestive chemosensation and feeding by leeches
Autore:
Kornreich, L; Kleinhaus, AL;
Indirizzi:
New York Med Coll, Dept Cell Biol & Anat, Valhalla, NY 10595 USA New York Med Coll Valhalla NY USA 10595 ol & Anat, Valhalla, NY 10595 USA
Titolo Testata:
PHYSIOLOGY & BEHAVIOR
fascicolo: 5, volume: 67, anno: 1999,
pagine: 635 - 641
SICI:
0031-9384(199911)67:5<635:PCAFBL>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
TASTE NERVE RESPONSES; HIRUDO-MEDICINALIS; MONOSODIUM GLUTAMATE; ALPHA-GUSTDUCIN; BEHAVIOR; PATHWAYS; RECEPTOR; STIMULI; NEURONS; SYSTEM;
Keywords:
feeding behavior; food rejection; leeches; postingestive sensory mechanisms; taste chemical senses; Hirudo medicinalis; Macrobdella decora;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Kleinhaus, AL New York Med Coll, Dept Cell Biol & Anat, Valhalla, NY 10595USA New York Med Coll Valhalla NY USA 10595 halla, NY 10595 USA
Citazione:
L. Kornreich e A.L. Kleinhaus, "Postingestive chemosensation and feeding by leeches", PHYSL BEHAV, 67(5), 1999, pp. 635-641

Abstract

Distinct chemical cues acting on chemosensory structures on the dorsal lipof bloodsucking leeches activate the entire complement of appetitive and ingestive feeding behaviors. However, it is not known whether the maintenance of ingestion depends on continuous stimulation of these peripheral chemosensors. Leeches of the species Hirudo medicinalis and Macrobdella decora were fed for 2 min on an artificial blood solution containing 150 mM NaCl/1 mM arginine before switching the feeding solution to various experimental mixtures. Leeches did not start to feed on, but continued to ingest solutionsin which equiosmolar KCI or lysine substituted for NaCl or arginine, respectively, until sated. In contrast, they rejected water and dropped off the feeding apparatus within 30 s of the exchange. Leeches also detached from the feeding tube when quinine, denatonium, or caffeine were added to the NaCl/arginine solution during an ongoing feeding bout. The duration of ingestion following the switch correlated inversely with the concentration of the drugs (0.1-10 mM). Superfusion of the dorsal lip with high concentrations of the bitter chemicals, while feeding was in progress, had no effect on theduration of ingestion. However, injections of the bitter substances directly into the gut, during a feeding bout, abruptly stopped ingestion. The results suggest that while leeches continue to sample their food once ingestion has begun, secondary chemosensory mechanisms situated downstream from thedorsal lip may be involved in the maintenance of ingestion and the rapid postingestive rejection of noxious foods. (C) 1999 Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 21:49:58