Lec5

Question 1

macroalgae associated to Sea grass beds:
➢ …. species belong to green algae
➢ …. species belong to brown algae
➢ …. species belong to red algae

Answer 1

➢ 13 species belong to green
➢ 8 species belong to brown algae
➢ 25 species belong to red algae

Question 2

occur In offshore deeper areas of the Western Arabian Gulf beyond the influence of wave action.

Answer 2

Muddy substrates

Question 3

occur as patches along the Saudi Coast of the Arabian Gulf. the subtidal rocks provide suitable substrata and physical conditions to support coral attachment

Answer 3

Shallow subtidal rocks

Question 4

Bird use rocky shore habitats for breeding and feeding purposes.

Answer 4

Herons

Question 5

They have nutrient transport systems.

Answer 5

Sea grass

Question 6

The western Arabian Gulf has vast areas with shallow water less than …. m depth suitable for Sea grass growth

Answer 6

15 m

Question 7

Microalgae require much higher light levels to grow than Sea grasses do.
T/F

Answer 7

F, sea grasses higher than microalgae

Question 8

feed directly on the Seagrass

Answer 8

• urchins
• fish
• green turtles
• dugong

Question 9

feed directly on the Seagrass

Answer 9

• urchins
• fish
• green turtles
• dugong

Question 10

In clear water, sea grasses reach depths of up to ,,,, m

Answer 10

17 m

Question 11

In very turbid waters sea grass beds may only reach depths of ,,,,,, m

Answer 11

5-8 m

Question 12

can be toxic to seagrasses at concentrations > 1 m

Answer 12

Sulfide in sediments

Question 13

are considered to be one of the most highly threatened
marine habitats along with coral reefs, mangroves and salt marshes Globally

Answer 13

Seagrass

Question 14

including burrowers and tube dwellers, and animals creeping or crawling at the sediment water interface

Answer 14

Infaunal species of fauna

Question 15

living freely under & over the leaf canopy such as fishes

Answer 15

Mobile species of fauna

Question 16

Living on leaves, mobile creeping & walking epifauna (e.g., gastropods) and swimming epifauna (e.g., caridean shrimp)

Answer 16

Epifaunal species of fauna

Question 17

Arabian Gulf sea grasses are subject to extreme salinity fluctuations ranging from …….. psu .

Answer 17

38-70 psu

Question 18

most widely distributed species of sea grass

Answer 18

Halodule uninervis

Question 19

Less common species of sea grass

Answer 19

Halophila stipulacea

Question 20

Rarely forming species of sea grass

Answer 20

Halophila ovalis

Question 21

grow whether mixed with algae or not, also grow in sheltered sandy pockets among coral reefs.

Answer 21

Sea grass

Question 22

Are flowering monocotyledon plant species that live in coastal and estuarine areas of the world.

Answer 22

Sea grasses