• Title/Summary/Keyword: Prey

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Feeding Habits of Yellow Goose Fish Lophius litulon and John Dory Zeus faber in the South Sea of Korea

  • Choi, Jung-Hwa;Sung, Bong-Jun;Lee, Dong-Woo;Kim, Jong-Bin;Oh, Taeck-Yun;Kim, Jung-Nyun
    • Fisheries and Aquatic Sciences
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    • v.14 no.4
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    • pp.435-441
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    • 2011
  • The feeding habits of yellow goosefish Lophius litulon and John Dory Zeus faber were studied by analyzing the stomach contents of specimens collected in the South Sea of Korea. In total, 132 hauls were taken during six experimental trawl survey (Tamgu 1) cruises conducted on a seasonal basis (March 2005-October 2007). The main prey items of the two species were similar. Fishes and crustaceans were the most important prey, with neither species showing ontogenetic changes in preferred species. Specifically, Pennahia argentata was the preferred prey item of L. litulon, whereas Trichiurus lepturus and Engraulis japonicus were preferred by Z. faber. Larger Z. faber (>24 cm) preferred bigger prey such as T. lepturus and Larimichthys polyactis, while smaller Z. faber preferred E. japonicus and Acropoma japonicum.

Feeding habits of juvenile sea perch, Lateolabrax japonicus in tidal creek at Sangnae-ri Suncheon, Korea (순천 상내리 갯골에 출현하는 농어(Lateolabrax japonicus) 치어의 식성)

  • Jeong, Jae Mook;Kim, Hyeon Ji;Ye, Sang Jin;Yoem, Si Dong;Park, Jong Hyeok;Baeck, Gun Wook
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.51 no.2
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    • pp.221-226
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    • 2015
  • During the study periods, total 143 individuals of Lateolabrax japonicus were collected. Body length (BL) range was 2.0-11.8 cm. Empty stomach occurred in 8.4%. The most abundant prey was copepods. Among copepods, Tigriopus japonicus was the most abundant prey appeared 32.1 in %F. Next important prey was shrimps and mysids. The results of analysis in ontogenetic changes, main prey of two small size classes (2.0-3.9 cm, 4.0-5.9 cm) were copepods. Thereafter, copepods percentage was decreased, but shrimps, mysids, fishes percentage was increased by increasing body length from 8.0 cm< size class.

Marine Prey Selectivity of Released Juvenile Chum Salmon (Oncorhynchus keta) During arly Marine Migration in Korean Waters (방류 연어, Oncorhynchus keta 치어의 해양 먹이선택성)

  • Kwon, O-Nam;Kim, Ju-Kyoung;Yoon, Moon-Geun;Kim, Doo-Ho;Hong, Kwan-Eui
    • Journal of Fisheries and Marine Sciences Education
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    • v.26 no.2
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    • pp.421-429
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    • 2014
  • We investigated the feeding ecology of juvenile chum salmon (Oncorhynchus keta) during the critical early life stage prey selectivity of juvenile chum salmon during early marine migration in Korean waters at spring 2011. Salmon juveniles and zooplanktons were collected to draw with $20m{\times}5m$ gill net and $300{\mu}m$ mesh zooplankton net at each station on 11th-13th April n 2011. Collected zooplanktons were classified to 5 Phylum, 6 Class, 9 Order 17 Species in this study. Almost 76.4-100% species were classified to Phylum Arthropoda, dominant species was a species out of Hyperia galba of Order Amphipoda, Acartia spp and Paracalanus parvus of Order Calanoida. Collected salmon juveniles were grew up to average 4.7-5.4 cm fork length and average 1.0-1.5 g wet weight in whole station. Fish stomach content (mg/salmon) was heaver to 97.4, 82.4 and 63.2 mg wet weight/salmon in ST 2, 3, 4 than 20.4, 18.9 mg/salmon of ST 1, 5, because there are fish (sand eel, Hypoptychus dybowskii) and Krill (Euphausia) as prey in salmon stomach in ST 2, 3, 4. And ST 2, 3, 4 and 5 were dominated by Amphipoda as Hyperia galba, Themisto japonica and Gammarus sp., but ST 1 was dominated by copepod, because of absence of Amphipoda in the station. Therefore small Amphipoda as Hyperia galba was good prey for just released salmon juvenile in nature.

Foraging Behavior in Beauty Goby, Pterogobius zacalles: Relationship between Foraging Modes and Prey Size (다섯동갈망둑, Pterogobius zacalles의 채식행동: 채식방법과 먹이생물 크기의 관계에 관하여)

  • Choi, Seung-Ho
    • Korean Journal of Ichthyology
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    • v.20 no.2
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    • pp.123-128
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    • 2008
  • The foraging behavior of the beauty goby, Pterogobius zacalles, was studied at Mutu Bay, Aomori province, Japan. P. zacalles harvested invertebrates prey from benthic substrates by using two distinct foraging modes: picking substrate among boulders and sucking surface of boulder. Among others, picking substrate among boulders was primarily used foraging mode. The foraging modes of P. zacalles were followed by three stages: searching for prey, feeding and chewing. For foraging, it takes less time to suck out the surface of boulder than pick up substrate among boulders, because the resting site of P. zacalles is close to the place where they do sucking. The diets of P. zacalles primarily consisted of benthic amphipods regardless of their foraging modes. Only the difference was that they can get bigger amphipods when they did picking rather than sucking. Even though it needs more time and energy to do picking, P. zacalles was compensated by getting a high-calorie diet eventually, therefore prey size can be the determinant of their foraging modes.

Web-Building Strategy of a Wasp Spider, Argiope bruennichi, under Sensory Information Emitted by a Prey Species (먹이 종 감각 정보 제공에 따른 긴호랑거미(Argiope bruennichi)의 웹 건축 전략)

  • Jin, Woo-Young;Shin, Hyun-Chul;Kim, Kil-Won
    • Journal of Life Science
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    • v.21 no.7
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    • pp.1009-1015
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    • 2011
  • Web structure of spiders is a foraging strategy as well as an investment to get prey. In order to increase the fitness consequence, spiders change their foraging strategy based on sensory information provided by prey species. We conducted an experiment to demonstrate whether an orb-web building spider, Argiope bruennichi modifies its web-building behavior after experiencing sensory information emitted by a UV recognizing flying insect, Bombus terrestris. To know how the web structure would be modified, we observed web characteristics after providing sensory information of a potential prey species, the bumblebee (experimental group) and compared them to the control group (no information provided). We hypothesized that the spiders of the experimental group would increase investments in their web construction and stabilimentum decoration. The results rejected our hypothesis. Web and stabilimentum constructions decreased in the course of the experiment in both the control group and the experimental group. The individuals did not increase their stabilimentum length and did not extend their web areas, in spite of sensory information given by the nectar collector.

Development and oviposition of Orius strigicollis (Poppius) (Hemiptera: Anthocoridae) reared on three different insect preys (먹이 곤충에 따른 Orius strigicollis(Poppius)의 발육과 산란)

  • 김정환;한만위;이건형;김용헌;이정운;인치종
    • Korean journal of applied entomology
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    • v.36 no.2
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    • pp.166-171
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    • 1997
  • To find out an alternative prey of Orius strigicollis Poppius in the laboratory continuous rearing system, cotton aphid (Aphis gossypii), two spotted spider mite (Tetmnychus urticae) and mold mite (Tyrophagus putrescenriae) were tested as alternative prey. Development and oviposition of 0. strigicollis were observed at 25f l0C, RH 60-80% and 16L:8D. Survival rate and developmental period of the nymphal stages of 0. strigicollis was 81. 6% and 11.6 days when fed on cotton aphid, 56.796, 14.6 days, 42.3% and 16.5 days when fed on two spotted spider mite and mold mite, respectively. Total oviposition of 0. strigicollis was 68.5 eggslfemaie fed on cotton aphid, 46.1 and 26.5 eggsifemale fed on two spotted spider mite and mold mite, respectively. Cotton aphid seems to be most suitable prey for rearing 0 . strigicollis among the three prey species tested.

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Simulation of Sustainable Co-evolving Predator-Prey System Controlled by Neural Network

  • Lee, Taewoo;Kim, Sookyun;Shim, Yoonsik
    • Journal of the Korea Society of Computer and Information
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    • v.26 no.9
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    • pp.27-35
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    • 2021
  • Artificial life is used in various fields of applied science by evaluating natural life-related systems, their processes, and evolution. Research has been actively conducted to evolve physical body design and behavioral control strategies for the dynamic activities of these artificial life forms. However, since co-evolution of shapes and neural networks is difficult, artificial life with optimized movements has only one movement in one form and most do not consider the environmental conditions around it. In this paper, artificial life that co-evolve bodies and neural networks using predator-prey models have environmental adaptive movements. The predator-prey hierarchy is then extended to the top-level predator, medium predator, prey three stages to determine the stability of the simulation according to initial population density and correlate between body evolution and population dynamics.

Ecophysiology of the kleptoplastidic dinoflagellate Shimiella gracilenta: I. spatiotemporal distribution in Korean coastal waters and growth and ingestion rates

  • Ok, Jin Hee;Jeong, Hae Jin;Kang, Hee Chang;Park, Sang Ah;Eom, Se Hee;You, Ji Hyun;Lee, Sung Yeon
    • ALGAE
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    • v.36 no.4
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    • pp.263-283
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    • 2021
  • To explore the ecophysiological characteristics of the kleptoplastidic dinoflagellate Shimiella gracilenta, we determined its spatiotemporal distribution in Korean coastal waters and growth and ingestion rates as a function of prey concentration. The abundance of S. gracilenta at 28 stations from 2015 to 2018 was measured using quantitative real-time polymerase chain reaction. Cells of S. gracilenta were detected at least once at all the stations and in each season, when temperature and salinity were 1.7-26.4℃ and 9.9-35.6, respectively. Moreover, among the 28 potential prey species tested, S. gracilenta SGJH1904 fed on diverse prey taxa. However, the highest abundance of S. gracilenta was only 3 cells mL-1 during the study period. The threshold Teleaulax amphioxeia concentration for S. gracilenta growth was 5,618 cells mL-1, which was much higher than the highest abundance of T. amphioxeia (667 cells mL-1). Thus, T. amphioxeia was not likely to support the growth of S. gracilenta in the field during the study period. However, the maximum specific growth and ingestion rates of S. gracilenta on T. amphioxeia, the optimal prey species, were 1.36 d-1 and 0.04 ng C predator-1 d-1, respectively. Thus, if the abundance of T. amphioxeia was much higher than 5,618 cells mL-1, the abundance of S. gracilenta could be much higher than the highest abundance observed in this study. Eurythermal and euryhaline characteristics of S. gracilenta and its ability to feed on diverse prey species and conduct kleptoplastidy are likely to be responsible for its common spatiotemporal distribution.

Lack of mixotrophy in three Karenia species and the prey spectrum of Karenia mikimotoi (Gymnodiniales, Dinophyceae)

  • Jin Hee Ok;Hae Jin Jeong;An Suk Lim;Hee Chang Kang;Ji Hyun You;Sang Ah Park;Se Hee Eom
    • ALGAE
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    • v.38 no.1
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    • pp.39-55
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    • 2023
  • Exploring mixotrophy of dinoflagellate species is critical to understanding red-tide dynamics and dinoflagellate evolution. Some species in the dinoflagellate genus Karenia have caused harmful algal blooms. Among 10 Karenia species, the mixotrophic ability of only two species, Karenia mikimotoi and Karenia brevis, has been investigated. These species have been revealed to be mixotrophic; however, the mixotrophy of the other species should be explored. Moreover, although K. mikimotoi was previously known to be mixotrophic, only a few potential prey species have been tested. We explored the mixotrophic ability of Karenia bicuneiformis, Karenia papilionacea, and Karenia selliformis and the prey spectrum of K. mikimotoi by incubating them with 16 potential prey species, including a cyanobacterium, diatom, prymnesiophyte, prasinophyte, raphidophyte, cryptophytes, and dinoflagellates. Cells of K. bicuneiformis, K. papilionacea, and K. selliformis did not feed on any tested potential prey species, indicating a lack of mixotrophy. The present study newly discovered that K. mikimotoi was able to feed on the common cryptophyte Teleaulax amphioxeia. The phylogenetic tree based on the large subunit ribosomal DNA showed that the mixotrophic species K. mikimotoi and K. brevis belonged to the same clade, but K. bicuneiformis, K. papilionacea, and K. selliformis were divided into different clades. Therefore, the presence or lack of a mixotrophic ability in this genus may be partially related to genetic characterizations. The results of this study suggest that Karenia species are not all mixotrophic, varying from the results of previous studies.

Dietary composition of two coexisting bat species, Myotis ikonnikovi and Plecotus ognevi, in the Mt. Jumbong forests, South Korea

  • Sungbae Joo;Injung An;Sun-Sook Kim
    • Journal of Ecology and Environment
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    • v.47 no.4
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    • pp.168-176
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    • 2023
  • Background: Many insectivorous bats have flexible diets, and the difference in prey item consumption among species is one of the key mechanisms that allows for the avoidance of interspecies competition and promotes coexistence within a microhabitat. In Korea, of the 24 bat species that are known to be distributed, eight insectivorous bats use forest areas as both roosting and foraging sites. Here, we aimed to understand the resource partitioning and coexistence strategies between two bat species, Myotis ikonnikovi and Plecotus ognevi, cohabiting the Mt. Jumbong forests, by comparing the differences in dietary consumption based on habitat utilization. Results: Upon examining their dietary composition using the DNA meta-barcoding approach, we identified 403 prey items (amplicon sequence variants). A greater prey diversity including Lepidoptera, Diptera, Coleoptera, and Ephemeroptera, was detected from M. ikonnikovi, whereas most prey items identified from P. ognevi belonged to Lepidoptera. The diversity index of prey items was higher for M. ikonnikovi (H': 5.67, D: 0.995) than that for P. ognevi (H': 4.31, D: 0.985). Pianka's index value was 0.207, indicating little overlap in the dietary composition of these bat species. Our results suggest that M. ikonnikovi has a wider diet composition than P. ognevi. Conclusions: Based on the dietary analysis results, our results suggests the possibility of differences in foraging site preferences or microhabitat utilization between two bat species cohabiting the Mt. Jumbong. In addition, these differences may represent one of the important mechanism in reducing interspecific competition and enabling coexistence between the two bat species. We expected that our results will be valuable for understanding resource partitioning and the coexistence of bats inhabiting the Korean forests.