• Title/Summary/Keyword: invertebrates

Search Result 276, Processing Time 0.034 seconds

The initial mass loss rates and the changes in carbon/nitrogen ratio of dead woods for the three dominant tree species in tropical rainforests of Brunei Darussalam (브루나이 열대우림 내 주요 3개 수종 고사목의 초기 질량 감소율과 탄질율 변화)

  • Roh, Yujin;Jang, Minju;Son, Yowhan
    • Korean Journal of Environmental Biology
    • /
    • v.39 no.2
    • /
    • pp.218-224
    • /
    • 2021

  • This study was conducted to determine the mass-loss rates and the changes in carbon/nitrogen (C/N) ratio of dead woods, which were of following species: Dryobalanops aromatic, D. rappa, and Cratoxylum arborescens. These were dominant tree species in mixed Dipterocarp forests (MDF) and peat swamp forests (PSF) in Brunei Darussalam. In May, 2019, 48 dead wood samples (15 cm×4.8 cm×5 cm) were placed in MDF and PSF sites, and all the samples were collected after 16 months. The effects of species on mass loss were statistically significant (p<0.05); however, no difference was observed in the mass loss obtained from the two forest types (p>0.05). The initial density (g·cm-3) of the dead woods D. aromatic, D. rappa, and C. arborescens, was 0.64±0.02, 0.60±0.00, and 0.44±0.01, respectively. Also the annual mass loss rate (%) was estimated to be 6.37, 8.17, and 18.53 for D. aromatic, D. rappa, and C. arborescens, respectively. The proportion of dead woods in decay class III was only 25% of C. arborescens samples, which were attacked by wood-feeding invertebrates, such as termites. The C/N ratio decreased significantly in D. aromatic and D. rappa, but the decreasing trend of C/N ratio was not statistically significant in C. arborescens. The results indicate that physical traits of dead woods, such as density, could be one of the main factors causing the decomposition of dead woods initially, as invertebrates such as termites are one of the key decomposers of dead wood in tropical rainforests. In the samples of C. arborescens, which was attacked by invertebrates, nitrogen immobilization occurred to lesser extent as compared to that observed in D. aromatic and D. rappa.

  • https://doi.org/10.11626/KJEB.2021.39.2.218 인용 PDF KSCI

Two New Eisenia Species from South Korea Similar to E. koreana and Comparable to Eisenoides from USA (Oligochaeta: Lumbricidae)

  • Blakemore, Robert J.;Park, Tae Seo
    • Animal Systematics, Evolution and Diversity
    • /
    • v.28 no.4
    • /
    • pp.297-303
    • /
    • 2012

  • New Korean lumbricids are described: Eisenia gaga Blakemore sp. nov. from remote Gageodo Island and E. sindo Blakemore, sp. nov. from an island at Incheon. Both are comparable to Eisenia koreana (Zicsi, 1972) from near Pyongyang, North Korea. A remarkable yet previously unrecognized similarity to American earthworm Eisenoides carolinensis (Michaelsen, 1910) is discussed, but synonymy is rejected on tenuous morphological grounds (form of nephridial vesicle bladders) with taxonomy supported by objective molecular data (mtDNA cytochrome c oxidase subunit 1 barcodes).

  • https://doi.org/10.5635/ASED.2012.28.4.297 인용 PDF KSCI

Projection Pathway of Specific FMRFamide-producing Neurons in Terminal Abdominal Ganglion Innervating Hindgut

  • Na, So-Young;Lee, Bong-Hee
    • Proceedings of the Korean Society of Sericultural Science Conference
    • /
    • 2003.04a
    • /
    • pp.74-74
    • /
    • 2003

  • Tetrapeptide FMRFamide, originally isolated and then characterized from the mollusc (Clam) Macrocallista, had been demonstrated to have action as a cardioexcitatory agent. During the next two decades since its discover, neuropeptide FMRFamide and a large family of related peptides have been shown to exist in the central nervous system and gut of a wide variety of invertebrates and vertebrates including insect species. (omitted)

  • PDF