冷空间的竞争 In densely populated benthic community. competition for space is likely to be severe, and biotic interactions among algae, and between algae and other groups of organisms like bacteria, fungi seagrasses, grazing animals are more complex Spores(孢子) of seaweeds germinates(萌发) only when they adheres to substrate Crowding lead shading and competition for nutrients and there is an inverse relationship between density and individual size
❖ 空间的竞争 In densely populated benthic community, competition for space is likely to be severe, and biotic interactions among algae, and between algae and other groups of organisms like bacteria, fungi, seagrasses, grazing animals are more complex. Spores(孢子) of seaweeds germinates（萌发） only when they adheres to substrate. Crowding lead shading and competition for nutrients and there is an inverse relationship between density and individual size
两种不同的底栖环境 ☆ Intertidal zone潮间带 in which organisms are subject at intervals to desiccation(T PR),direct solar heat rain. snow. freshwater runoff wind frost. etc and more uniform. but has nevertheless marked ☆ Subtidal zone 潮下带 which is strictly aquat variables of light intensity and quality
两种不同的底栖环境 ❖ Intertidal zone 潮间带 in which organisms are subject at intervals to desiccation (干燥), direct solar heat, rain, snow, freshwater runoff, wind, frost, etc. ❖ Subtidal zone 潮下带 which is strictly aquatic and more uniform, but has nevertheless marked variables of light intensity and quality
&s The algae growing in intertidal zone must be able to withstand and recover rapidly from these changes than subtidal algae o Full sunlight severly in hibit photosynthesis in phytoplanktons, but photosynthesis versus light intensity curve of benthic diatoms has a broad optimum, saturating at fairly low light intensities with only slight inhibition under full sunlight
❖ The algae growing in intertidal zone must be able to withstand and recover rapidly from these changes than subtidal algae. ❖ Full sunlight severly in hibit photosynthesis in phytoplanktons, but photosynthesis versus light intensity curve of benthic diatoms has a broad optimum, saturating at fairly low light intensities with only slight inhibition under full sunlight
100 Beach diatoms 80 E 60 Phytoplankton 40 20 Full sunlight range 102030405060708090100 Solar irradiance gm cal cm 2 h1 Fig. 6.3. Light-photosynthesis curves for beach diatoms(Taylor 1964) and marine phytop lankton(ryther, 1956)
两种主要的沉积物基质 ☆ Solid rock礁石 Particulate sand or mud沙、泥 o In general, on rocky shores, the greatest amount of solid substratum is to be found between tide marks with a progressive change through sand to mud In deep water o The stability of substratum is obviously important for growth of seaweeds
两种主要的沉积物基质 ❖ Solid rock 礁石 ❖ Particulate sand or mud 沙、泥 ❖ In general, on rocky shores, the greatest amount of solid substratum is to be found between tide marks, with a progressive change through sand to mud in deep water. ❖ The stability of substratum is obviously important for growth of seaweeds