第六讲第二节 大型底栖海藻生态
第六讲第二节 大型底栖海藻生态
主要内容 ● What are seaweeds? ●底栖藻类固着生长 ●对光的需求产生形态上的适应 ● Seaweed的种类:绿藻、褐藻、红藻 o Grazers, competition and defence o Seaweed as part of an ecosystem o The rigours of seaweed life
主要内容 ⚫ What are seaweeds? ⚫ 底栖藻类固着生长 ⚫ 对光的需求产生形态上的适应 ⚫ Seaweed的种类：绿藻、褐藻、红藻 ⚫ Grazers, competition and defence ⚫ Seaweed as part of an ecosystem ⚫ The rigours of seaweed life
o Wherever seaweeds grow they have to compete for space, inorganic nutrients and light. They are also in constant danger of being grazed on by gastropods(腹足动物),fsh, sea slugs(海蛤蝓) and sea urchins(海胆) and have some sinister tactics for putting off predators
⚫ Wherever seaweeds grow they have to compete for space, inorganic nutrients and light. They are also in constant danger of being grazed on by gastropods（腹足动物）, fish, sea slugs（海蛤蝓） and sea urchins（海胆） and have some sinister tactics for putting off predators
LEFT An'army' of Littorina snails grazing green seaweeds from a rock surface
⚫ An “army”of Littorina snails grazing green seaweeds form a rock surface (Fig. p59)
Fighting for space 1)种内竞争: o when there is mass settling and germination of spores of the same species in a confined area, competition naturally occurs between the tha(叶状体) In general this results in an inverse relationshil between density and size. This Is particularly b applicable to stands of fast-growing, short-lived species such as U№a(石莼), Bangia(红毛菜) Enteromorpha(浒苔) and Porphyra(紫菜)
Fighting for space ⚫ 1)种内竞争： ⚫ when there is mass settling and germination of spores of the same species in a confined area, competition naturally occurs between the thalli(叶状体). ⚫ In general this results in an inverse relationship between density and size. This is particularly applicable to stands of fast-growing, short-lived species such as Ulva(石莼),Bangia（红毛菜）, Enteromorpha（浒苔） and Porphyra（紫菜）