The greatest growth of seaweeds occur where there is a rock surface for attachment 冷 The topography(地形) of rocky shore also affects the type of flora On steep rocky surface,sit(泥沙) doesnt accumulate and only epilithic(长在石头上的) flora grow. But a change in the flora occur where sufficient silt of sand collect on flat rocky surface Some epilithic algae: laminaria海带 Porphyra紫菜
❖ The greatest growth of seaweeds occur where there is a rock surface for attachment. ❖ The topography（地形）of rocky shore also affects the type of flora. On steep rocky surface, silt（泥沙） doesn’t accumulate and only epilithic （长在石头上的） flora grow. But a change in the flora occur where sufficient silt of sand collect on flat rocky surface. Some epilithic algae: Laminaria 海带 Porphyra 紫菜
冷 The moving pebbles(鹅卵石) or gravel(砂砾) can not maintain an epilithic flora, yet similar sized pebbled in a protected habitat are colonized by genera such as Enteromorpha(浒苔), Ectocarpus(水云) of even fucus (墨角藻) .o In areas of sand movement, the species diversity is low and the species tend to be tough and wiry .o Most of the seaweeds found on sandy shore are torn loose from their holdfast(固着器) and washed on to shore
❖ The moving pebbles(鹅卵石) or gravel(砂砾) can not maintain an epilithic flora, yet similar sized pebbled in a protected habitat are colonized by genera such as Enteromorpha(浒苔), Ectocarpus（水云） of even Fucus （墨角藻）. ❖ In areas of sand movement, the species diversity is low and the species tend to be tough and wiry. ❖ Most of the seaweeds found on sandy shore are torn loose from their holdfast（固着器） and washed on to shore
第一节微型底栖藻类 冷 Types of benthic microalgae底栖微藻的类群 l)Blue- green algae蓝绿藻 2) Diatom硅藻 3) Dinoflagellates甲藻
第一节 微型底栖藻类 ❖ Types of benthic microalgae 底栖微藻的类群 1) Blue-green algae 蓝绿藻 2) Diatom 硅藻 3) Dinoflagellates 甲藻
1) Blue-green algae 8 In marine habitats, blue-green algae are relatively inconspicuous as compared to other algae. The growth of blue-green algae often gives a black appearance to the substratum &s Blue-green algae live in all parts of the lighted marine benthic environment and may be dredged from water depth more than 30m under very dim illumination
1）Blue-green algae ❖ In marine habitats, blue-green algae are relatively inconspicuous as compared to other algae. The growth of blue-green algae often gives a black appearance to the substratum. ❖ Blue-green algae live in all parts of the lighted marine benthic environment and may be dredged from water depth more than 30m under very dim illumination