16 Dec 2009

中六理組一班生物科野外考察 (淡水溪流)

十二月十六日為本校中六理組一班生物科野外考察，地點為大帽山淡水溪流，是次野外考察由嗇色園可觀自然教育中心暨天文館主辦。考察中，同學透過搜集數據及進行實驗，分析溪流環境因素如何影響物種多樣性及其適應能力，也了解周遭對河溪所造成之污染，最後進行小組匯報及答問環節，同學更能在考察中尋找香港受保護的香港瘰螈及海南沼蝦。除提高學生考察實驗技巧及數據分析能力，同學更能在考察中明白到環境保育及可持續發展之重要性！

  • Mr. Dickson Wong, tutor of the center, briefs the students on freshwater ecology and methodology in the field studies.

  • Students are walking uphill to collect data in the freshwater stream.

  • Two students are getting water sample for chemical analysis in the laboratory.

  • Transects are set across the river to investigate the physical factors of the sectional profile, in addition to flora and fauna distribution.

  • Students are carefully measuring the depth of the river to sketch a cross-sectional profile.

  • Students are taking readings of temperature and relative humidity above the water level.

  • Mr. Wong is teaching students to gently brush off organisms attaching on the underneath surface of the stone

  • Students are sampling mobile shrimps in the river.

  • This is a Small Long-armed Shrimp (Macrobrachium hainanense), the nocturnal shrimps which are generalist predators that feed primarily on slow-moving or sedentary benthic macroinvertebrates.

  • This is a Hong Kong Newt (Paramesotriton honkongensis), a protected species under Wild Animals Protection Ordinance Cap 170. When threatened it releases a toxic secretion and may also feign death, rolling onto its back and ex

  • Bibiana is using a luxmeter to measure the light intensity at the river bed.

  • The big family of class 6S1 enjoys the field trip very much.

  • After the field trip, students are analyzing their data and preparing for the following parts of chemical analysis in the laboratory.

  • Raymond is filtering the water sample to measure the amount of total suspended solid in the river section.

  • Spectrophotometer is used to quantify the amount of phosphate ions and ammonia in the river section.

  • Spectrophotometer is used to quantify the amount of phosphate ions and ammonia in the river section.

  • Samson is using a light microscope to identify algal cells in the polluted region of the river.

  • Different working groups share their data and findings on the whiteboard.

  • After the field trip, each group has to give a pinpoint presentation focusing on different aspects of study.

  • At last, a photo is taken with the students of partner school in the field trip, Fanling Government Secondary School.