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Details for article 31 of 181 found articles
| Title: |
Chemoreception in a lysianassid amphipod: The chemicals that initiate food-searching behavior |
| Author: |
Meador, James P. |
| Appeared in: |
Marine & freshwater behaviour & physiology |
| Paging: | Volume 14 (1989) nr. 2 pages 65-80 |
| Year: |
1989-01 |
| Contents: |
Fifty-eight compounds were tested individually on Orchomene limodes (Gammaridea: Lysianassidae). Major responses were elicited by small nitrogenous compounds, mainly amino acids and amines. Organic acids, fatty acids, and carbohydrates were without effect. The vast majority of the compounds tested singly, produced no response below 100 μM. Mackerel homogenate was fractionated and tested. Almost all of the potency of this homogenate was found in the diffusate fraction which contained molecules smaller than 6000 daltons. When this fraction was treated with ethanol, a significant decrease in the activity was noted. An artificial solution of small nitrogenous compounds was made to mimic natural mackerel diffusate. This solution alone was without effect when applied at a concentration equivalent to natural diffusate. The addition of small amounts of reduced glutathione to this mixture elicited responses which equaled that of the natural solution on a molarity equivalent basis. Oxidized glutathione was not effective in producing a response. It is concluded that the thiol moiety of GSH is required for full activity. Synergistic interactions between the glutathione and some component(s) of the synthetic mixture are implicated. Reduced glutathione in combination with amino acids lowered the concentration needed to produce a response equivalent to that of individual amino acids by approximately 100 times. The threshold concentration needed to elicit a response in this species is about 75 μM. When no stimulatory chemicals are emanating from a substance, this species will ingest an item based solely on its physical nature. This is termed texture feeding. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 31 of 181 found articles
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