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指導教授 : 蔣國平 博士 報告學生 : 王榮

指導教授 : 蔣國平 博士 報告學生 : 王榮. INTRODUCTION. Heterotrophic bacteria constitute a fundamental component of marine ecosystems, with important roles in the biogeochemical cycles of key elements (Sherr & Sherr 2000).

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指導教授 : 蔣國平 博士 報告學生 : 王榮

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  1. 指導教授:蔣國平 博士 報告學生:王榮

  2. INTRODUCTION

  3. Heterotrophic bacteria constitute a fundamental component of marine ecosystems, with important roles in the biogeochemical cycles of key elements (Sherr & Sherr 2000). Bacteria with high nucleic acid (HNA) content were the active fraction (e.g. Gasol & del Giorgio 2000). Bacteria with low nucleic acid (LNA) content are not metabolically inactive and can be an integral part of the microbial food web (Zubkov et al. 2001, Jochem et al. 2004, Longnecker et al. 2005).

  4. MATERIALS AND METHODS

  5. 2000.5/30~6/9

  6. kD= 1/t × (dC/dt) kD= μn – g × D μ0 = g + kD0, 淨細菌數量增加量 (對T時間的數量作積分) Cincorporated = μ × B0(e(μ – g)t–1) × (μ – g)–1 Cgrazed = g × B0(e(μ – g)t–1) × (μ – g) –1 15 fg C cell–1 C/μ=ΔBk/K

  7. RESULTS AND DISCUSSION

  8. Surface ,DCM 差4~6 C Freshwater 影響深度 10~30m(北向南遞減) 表水溫 18.5~19.8C(北至南)

  9. Surface Chl a :0.12±0.05 mgl-1 DCM Chl a :0.74±0.30 mgl-1 Bac. Size: surface HNA >surface LNA >DCM HNA LNA (p<0.01) (p<0.001)

  10. Bacterial concentration Bac. Abundance Surface:4.5~13.3x105(7.2±2.9x105) DCM:6.4~9x105(7.4±1.1x105) HNA 比例 Surface:34~55%(49.4±5.3%) DCM:39~47%(43.0±2.9%) Growth and grazing

  11. HNA:1.18±0.60d-1 LNA:0.47±0.28d-1 HNA:0.36±0.23d-1 LNA:0.90±0.46d-1 HNA:1.02±0.31d-1 LNA:0.37±0.19d-1 HNA:0.26±0.17d-1 LNA:0.77±0.50d-1 ms:0.88±0.43d-1 mD:0.71±0.23d-1 gs:0.75±0.23d-1 gD:0.58±0.29d-1

  12. Bacterial C flux Surface: 10.9±4.40 mgCl-1 DCM: 11.1±1.69 mgCl-1 Incorporation:10.2±6.4 mgCl-1d-1 Grazed: 9.0±3.2 mgCl-1d-1 Incorporation: 8.7±4.3 mgCl-1d-1 Grazed: 6.9±4.0 mgCl-1d-1 (70%HNA) (80%LNA) Bacterial C flux :10mgCl-1d-1 Phytoplanlton C flux :4.6mgCl-1d-1 200% (surface) photosynthesis versus irradiance (P-E) 3.48 ± 2.02 mg of C mg–1 chlorophyll a h–1(與前六年相當) Cincorporated = μ × B0(e(μ – g)t–1) × (μ – g)–1

  13. m: growth rates 0.88d-1 > 0.25d-1 (之前的報告) dilution growth and grazing rates > C14 ,餵珠子 m > 1d-1 :低grazing,排除大型攝食者 log10 BP= 0.07 × T + 0.40 log10 chlorophyll a (Pedrós-Alió et al.,2000) Gasol et al. (2002) high intrinsic growth rates when bacterialabundances are limited by predation and low growthrates when limited by resources. g: Vaqué et al. (2001) for the area, but are consistent with or even lower than rates reported from elsewhere 15fgC cell-1

  14. END

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