Feeding activity

Rongsriyam, Y., S. Prownebon, and S. Hirakoso. 1968. Effects of insecticides on the feeding activity of the guppy, a mosquito eating fish, in Thailand. Bull. World Health Org. 39 977-980. 

M. salmoides 45 Decline in feeding activity after 8 weeks 38... 

Glen DM, Wilson MJ, Brain P, Stroud G. Feeding activity and survival of slugs, Derocerus reticulatum, exposed to the rhabditid nematode, Phasmarhabditis hermaphrodita a model of dose response. Bio Cont. 2000 17 73-81. 

The results illustrate that RP-HPLC can contribute to the elucidation of the feeding activity of copepod species [77],... 

For PAHs with log Ko s ranging from 3.4 to 5.3, differences between the CFs in SPMDs and in oysters decreased with increasing Ko (Figure 7.7). In the case of PAHs with log Ko s >5.6, oyster CFs were much higher in the low treatment (10 ng L ), where feeding appeared to occur, than in the high treatment (250 ng ), where feeding activity appeared to be minimal. The ability of juvenile... 

Although phototrophs are restricted to the surface ocean, photosynthesis is the ultimate source of almost all the organic matter that supports heterotrophic activity in the sea. As shown in Figure 8.1, this organic matter is transferred through the marine food web by the feeding activities of heterotrophs including bacteria, protozoans, and animals. 

Bioturbation The physical mixing of sediments caused by the burrowing and feeding activities of benthic organisms. 

However these compounds either singly or in combination do not account for the total lack of feeding activity observed either in the laboratory or in the field. Resistance of S. nemoralis to Insect attack seems to Involve, as is expected, not a single class of compounds but a multichemical response. Other compounds isolated from nemoralis showing antifeedant activity to Trirhabda canadensis are at present under investigation. 

JVeit The assumption is that an SCNdesioned animal, monitored under an LD cycle and showing masking of locomotor activity, will have an altered feeding activity. Is this known ... 

Resource restriction. If chemical defenses vary quantitatively within or between individual plants, then some tissues may be defended while others are not. As a result, insects have available to them the evolutionary option of avoidance they may develop the ability to recognize poor quality food and avoid it, rather than evolving detoxication mechanisms (12,18). This should result in feeding activity concentrated on a restricted set of tissues or plant individuals. There are two important consequences of this. First, contact rates with defenses can be lowered by avoiding them. Hence, the evolution of detoxication is less li)cely or less rapid (18). Second, and perhaps more important, the effectiveness of natural enemies may be enhanced (below). 

An insect host s exposure to parasites and predators may be increased by variable plant defenses in three ways. First, by restricting feeding activity to certain tissue types or portions of the host plant, the position of insect hosts becomes more predictable. Parasites (24,46,42) or predators (48) able to recognize physical plant traits such as tissue color or form, or those capable of employing the unique chemistry of the preferred tissues as cues (47,49) would be able to locate their hosts more readily by focusing their search on these traits. 

Finally, density-dependent mortality from various enemies may be enhanced by host plant variation. Again, focusing feeding activities on a restricted set of suitable tissues should also focus the activities and abundance of pathogens, parasitoids, and predators. Sessile insects, such as gall-forming aphids (55,62),... 

Several phenylpropanoid compounds have pronounced anti feeding activity. Isoasarone (from Piper futokadzura, Piperaceae) and piperenone were highly active against Spodoptera litura (54). 

A number of sesquiterpenes have been demonstrated to have pronounced biological activity ( ) among the non-volatile compounds the sesquiterpene lactones are best known (M) but other oxygenated sesquiterpenes are also known to be active. For example, the role of gossypol, a dimeric sesquiterpene and structurally related compounds has been investigated (21,22). The oxygenated sesquiterpenes, shiromodiol monoacetate and diacetate, from Parabenzoin trilobum (=Lindera triloba Blume) possess potent anti feeding activity toward Spodoptera litura larvae (85). 

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