• Title/Summary/Keyword: feeding preference

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The Feeding Preference of Cigarette Beetle, Lasioderma serricorne F., on Cured Tobacco Leaves. (궐련벌레의 원료 잎담배 식이 선호성에 관한 연구)

  • 오명희
    • Journal of the Korean Society of Tobacco Science
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    • v.16 no.2
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    • pp.122-127
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    • 1994
  • Feeding preference of cigarette beetle, Lasioderma sewicorne F., on cured tobacco leaves was investigated to obtain basic information on ecological management of the insect pest in tobacco storage warehouses. About 3, 000-4, 000 adults of the insect were released in a warehouse in which groud tobacco leaves were placed on the bottom and at 3m above the floor level, and numbers of insects attracted were examined. There was no significant difference on feeding preference between the two tobacco varieties, flue-cured(NC82) and air-cured(Br3l) tobacco leaves. However, significant differences were noted in feeding preference between thick and thin leaves and among different quality grades within a tobacco variety. Feeding preferences of cigarette beetle between flue- and air- cured tobacco varieties showed significant differences on the lower position, though there were no differences on the 3m upper position. On the 3m upper position, feeding preferences were different between thick and thin leaves of tobacco varieties, and variety X thickness and variety X thickness equality grades showed statistically significant differences. Significantly higher feeding preference by cigarette beetle adults was observed for the food placed on the 3m upper than on the lower position. There were negative correlations between quality grades of cured tobacco leaves and feeding preference on the lower position, and the regression equation was Y(feeding preference)=4.050-0.683 X (degree).

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Varietal Differences in Feeding Preference of the Striped Rice Borer Larvae (Chilo suppressalis W.) (이화명나방 유충의 식이선호성에 있어서 수도품종간 차이)

  • Choi S.Y.;Lee H.R.
    • Korean journal of applied entomology
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    • v.15 no.2 s.27
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    • pp.53-56
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    • 1976
  • A laboratory experiment was conducted to investigate varietal differences in feeding preference of striped rice borer larvae (Chilo suppressalis W.) to the stem pieces of the eight rice varieties. The preference of the larvae for feeding was significantly differed with the varieties, and in some varieties they were changed with the stages of the plants after transplanting. The larvae much more preferred the susceptible variety Rexoro than the resistant variety TKM-6. The varieties Tongil (Suweon 213-1), Yushin, Jinheung and IR-26 showed comparatively lower feeding preference than TKM-6. Some varieties exhibited a rather interesting phenomenon; strong preference in feeding was observed during the vegetative phase for Tetep and Tongil (Suweon 213-1) and during the maturing phase for Suweon 240 and Yushin. When the varieties TKM-6, Tongil and Rexore were given in several combinations, Rexore was strongly preferred by the larvae than others, and Tongil was still comparatively low in feeding preference of the larvae. The non-feeding preference of the larvae were considered to be in coincidence with the resistance of rice varieties to the striped rice borer.

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Effect of Degree of Ripeness and Size of Fruit on the Feeding Preference in Some Breeding Birds (식물의 종류와 열매의 크기 및 성숙도가 조류의 먹이선택에 미치는 영향)

  • Kim, Hyun-Woo;Cho, Sam-Rae;You, Young-Han
    • Korean Journal of Environmental Biology
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    • v.27 no.4
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    • pp.334-340
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    • 2009
  • In other to know the feeding preference over the degree of ripeness and size of fruits in birds, we gave them to three bird species in breeding condition, counted and analyzed the number of fruits by correspondence ordination technique. Chrysolophus pictus did not show a distinct preference in respect to degree of maturity or size of fruits of among three tree species. Columba rupestris preferred un-ripen fruits over ripen ones of Prunus yedoensis or Elaeagnus multiflora, but did not choose selectively in case of fruits of Malus sieboldii. Pavo muticus showed the reverse favorable pattern of Columba rupestris. Total feeding amounts eaten by birds were dependent on the initial feeding amounts of fruits. These results indicated that in feeding activity some birds chose differently in terms of species or maturity of fruits, but not in fruit size.

Feasibility on Differentiation of Resistance of Rice Varieties to Whitebacked Planthopper (Sogatella furcifera) using Radioisotope (방사성동위원소를 이용한 흰등멸구(Sogatella furcifera)의 저항성 검정법에 관한 연구 (2))

  • Chung K.H.;Choi S.Y.
    • Korean journal of applied entomology
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    • v.22 no.1 s.54
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    • pp.41-44
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    • 1983
  • In order to evaluate the technique of P-32 labelling method for screening lines of rice to whitebacked planthopper, the relationship between the amount of ingestion and feeding preference of insects were observed with the resistant and susceptible lines where characteristics were predetermined by comparing their feeding preference and antibiosis method. The feeding preference of the insects was significantly correlated with the amount of P-32 ingestion. It was more manifest in adults than nymphs of the whitebacked planthopper. The density of nymph and radioactivity of P-32 were high in the susceptible line. This suggested that deforming the ingestion amount of P-32 in the insects seemed to be useful technique for accurate screening. For this technique, the uniform labelling of P-32 on the rice seedings was prerequisite and the uniformity was increased by triming roots and leaves in the length and number.

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Feeding Stimulants and Feeding Preference of Haliotis discus Reeve (Jeju Island) to Marine Algae (제주도산 까막전복의 해조류 섭식선호도와 섭식자극물질)

  • Lee, Joon-Baek;Kim, Bo-Young
    • Korean Journal of Environmental Biology
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    • v.31 no.4
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    • pp.458-470
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    • 2013
  • Haliotis discus, a useful abalone of herbivorous gastropod, shows feeding preference to marine algae depending upon their growth stage and recognition of taste. This study was carried out to investigate this abalone's algal preferences and the presence of feeding stimulants. In single-choice experiments the small (S) group generally preferred Ulva pertusa (Chlorophyta), whereas the medium (M) and large (L) group preferred both Laminaria japonica (Phaeophyta) and Undaria pinnatifida (Phaeophyta). In multi-choice experiments using 4 algal species of L. japonica, U. pertusa, U. pinnatifida and Ecklonia cava (Phaeophyta), the results were same as in the single-choice experiments; the S group preferred U. pertusa the most, while the M and L group preferred both U. pinnatifida and L. japonica. However E. cava was not preferred by any groups. In order to examine the presence of feeding stimulant, chemical compounds from algae used as feed were isolated and identified. The abalone responded to water soluble matters of L. japonica, U. pinnatifida and U. pertusa, but those of E. cava and Sargassum sagamianum (Phaeophyta) were not attractive to them. In feeding stimulant experiments using fat soluble matters, the S group preferred the fat soluble matter of U. pertusa the most, while the M group and the L group preferred those of U. pertusa and U. pinnatifida, and those of L. japonica, respectively. However the fat soluble matter of S. sagamianum was not attractive to the abalone. The results of feeding stimulant experiments were same as those of single-choice or multi-choice experiments, which showed that compound lipids in fat soluble matter might act as feeding-stimulant.

Distribution Pattern and Feeding Preference of Asterias amurensis (Echinodermata: Asteriidae) in Tongyeong, Korea (통영해역에 서식하는 아므르불가사리의 분포 특성과 서식처에 따른 먹이 선호도 비교)

  • PARK Sang-Gyu;PARK Heung-Sik;YUN Sung Gyu;YI Soon Kil
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.37 no.6
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    • pp.469-477
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    • 2004
  • This study examined distributional patterns of Asterias amurensis in Tongyeong, the central South Sea of Korea. The density of the sea star was estimated at 10 chosen sites in the inner and the outer parts of the Tongyeong coast from December 2000. The mean density of the species in this area was $2.4ind./m^{2}$. The seasonal surveys conducted at 3 arbitrary chosen sites (i.e., sea cage, reef and soft sediment) also showed that the abundance of the species at the sea cage site $(density:\;3.6\;ind./m^{2};\;biomass:\;250.7\;gwwt/m^{2})$ was significantly higher than at the reef site $(density:\;1.7\;ind./m^{2};\;biomass:\;63.5\;gwwt/m^{2})$ and the soft sediment site $(density:\;0.4\;ind./m^{2};\;biomass:\;18.9\;gwwt/m^{2})$. Densities were higher at sea cages areas than at reefs and soft bottom sites. At sea cage site, A. amurensis population exhibited a strong aggregated distributional pattern. In contrast, at reef and soft bottom sites, A. amurensis population showed a random distributional pattern. The spatial difference in prey species and its abundance was the primary factor determining the spatial heterogeneity of the sea star in its behavior characteristics. Experiments on the feeding preference indicated that A. amurensis had a strong selectivity on its prey, but this selectivity varied between populations living in different sites. In particular, A. amurensis populations at the reef site showed a strong selectivity on various sessile and mobile animals living in reef areas, suggesting that these animal groups may play a role as "windows for the survival of A. amurensis". These results suggest that the distribution of A. amurensis in Tongyeong is closely associated with abundance of prey species and the bottom composition.

Herbivory effects and growth rate of invasive species, Pomacea canaliculata on different macrophytes species

  • Ismail, Hasnun Nita;Anuar, Wan Nurul Hidayah Wan;Noor, Noormawaty Mohammad
    • Fisheries and Aquatic Sciences
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    • v.24 no.12
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    • pp.415-427
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    • 2021
  • Wetland ecosystems act as natural freshwater purification systems, but their rich biodiversity is being threatened with the introduction of the non-native freshwater snail, Pomacea canaliculata. This study was conducted to measure the herbivory effects and growth rate of P. canaliculata on common macrophytes: Ipomoea aquatica, Ipomoea batatas, Pandanus amaryllifolius and Cucurma longa. In separate experiments, the macrophyte species were served as the snails' food as individual species and simultaneously. In the individual treatment, the growth pattern and rate were based on the snails' weight (mg/snail/day; n = 9) while the individual feeding consumption (mg/snail/day) was calculated from the leftover food. In the simultaneous treatment, the herbivory effects were evaluated as the feeding preference (%) from observations every two hours, while the total feeding consumption (mg) was calculated based on the food remaining after a 12-hour experiment (3 replicates: total n = 27). The results indicated that the growth pattern was significant for snails grazing on I. aquatica but not when other macrophyte species were eaten. The individual feeding consumption was higher when using I. aquatica than P. amaryllifolius but the growth rate for snails grazing on I. aquatica and P. amaryllifolius did not differ significantly. Meanwhile, the consumption of C. longa deterred the snails' growth rate. Although the snails consumed all the macrophytes in the individual experiment, when given the species simultaneously, the feeding preference and total feeding consumption were directed significantly more toward I. aquatica than P. amaryfollius and C. longa. We conclude that P. canaliculata is a generalist feeder given a limited choice of food but tends to show a strong feeding preference after being introduced to more food choices. These findings indicate that the introduction of P. canaliculata into wetland ecosystems may increase the herbivory effects on macrophytes, making these ecosystems vulnerable to the impact of eutrophication and biodiversity reduction.

Resistance of 'Tong-il' variety to the smaller brown planthopper, Laodelphax striatellus Fallen (애멸구에 대한 '통일' 벼의 저항성)

  • Choi S. Y.;Song Y. H.
    • Korean journal of applied entomology
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    • v.13 no.2 s.19
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    • pp.77-82
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    • 1974
  • The variety Tong-il from the IR667 lines have been reported as a variety resistant to the smaller brown planthopper, Laodelphax striatellus Fallen, in Korea. The resistance of Tong-il to the insect, however, have been mainly evaluated from a viewpoint of plant reaction of rice at the seedling stage. In this study, the nature of resistance of Tong-il to the insect was furthermore evaluated from the standpoints of feeding preference, antibiosis and plant tolerance in comparison with the resistant varieties Karsamba Red ASD-7 and Vellailangalayan. and the susceptible variety Jinheung which have been reported to the insect. The smaller brown planthopper much more prefered Tong-il for feeding than the resistant varieties ASD-7 and Vellailangalayan. The degree of antibiosis of Tong-il to the smaller brown planthopper was significantly lower than ASD-7 and Vellailangalayan. The results showed significantly lower nymphal mortality and higher adult emergence in Tong-il and Jinheung than other two resistant varieties. The degree o( tolerance of Tong-il to the insect was also lower than ASD-T and Vellailangalayan. Only. Tong-il seemed to be relatively more tolerable than Jinheung. The reason of showing resistant reaction of Tong-il in the mass screening test might be related with relatively lower feeding preference and more tolerance than Jinheung and other susceptible varieties.

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Feeding behaviors of a sea urchin, Mesocentrotus nudus, on six common seaweeds from the east coast of Korea

  • Yang, Kwon Mo;Jeon, Byung Hee;Kim, Hyung Geun;Kim, Jeong Ha
    • ALGAE
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    • v.36 no.1
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    • pp.51-60
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    • 2021
  • The sea urchin, Mesocentrotus nudus, is widely distributed in North West Pacific regions. It has a substantial impact on macroalgal communities as a generalist herbivore. This study examined various aspects of its feeding ecology, including algal preference, foraging behaviors, and possible effects of past feeding history on its algal preference. We used six common algal species (Ulva australis, Undaria pinnatifida, Sargassum confusum, Dictyopteris divaricata, Grateloupia elliptica, and Grateloupia angusta) from the east coast of Korea as food choice in a series of indoor aquarium experiments. The first choice of starved M. nudus was exclusively U. pinnatifida, followed by G. elliptica and S. confusum. Unlike large urchins, small urchins equally preferred U. pinnatifida and G. elliptica. On the other hand, Undaria-fed urchins preferred to feed only G. elliptica, although its preference slightly differed over time. We then grouped sea urchins into three categories (starved, Undaria-fed, mixed species-fed) to observe 12-days feeding preference as well as early foraging movements. Foraging behaviors of the three groups were distinctively different, although they could not completely reflect the actual consumption. For example, U. australis was highly attractive, but rarely eaten. Undaria-fed urchins seemed to stay with only S. confusum and U. australis. This study demonstrates that M. nudus shows high flexibility in food preference depending on past feeding history and body size. Its foraging behaviors are also affected by past feeding conditions, exhibiting active chemoreceptive movements.