Marine Organisms and Percent Cover

The video tutorial takes BIS2B students to Bodega Bay Harbor to explore floating docks and study species diversity over time. Plates are attached to docks for different durations (three, six, and nine months) to observe changes in species composition. The tutorial covers data collection methods, including percent cover and diversity index calculations, and provides a guide to identifying organisms like tunicates, bryozoans, and marine worms. The goal is to understand species competition and overgrowth over time.

What is the primary purpose of the floating docks at Bodega Bay Harbor?

• To study the effects of tides on marine life.

• To observe changes in species composition over time.

• To measure the water quality in the harbor.

• To provide a platform for fishing activities.

What is the main focus of the lab experiment conducted at Bodega Bay Harbor?

• To analyze changes in species diversity over time.

• To observe the impact of tides on dock stability.

• To study the effects of pollution on marine life.

• To measure the growth rate of specific marine species.

After how many months do the plates show the presence of sea squirts?

• Twelve months

• Nine months

• Three months

• Six months

Which organism is described as fun to squeeze and is found on nine-month plates?

• Sea squirts

• Marine worms

• Spirorbid worms

• Bryozoans

What method is used to calculate the diversity index in the lab?

• Using percent cover

• Measuring water temperature

• Counting individual species

• Weighing the plates

What is the significance of the grid used in the data collection process?

• It marks the areas with the most growth.

• It divides the plate into sections for percent cover estimation.

• It helps in identifying different species.

• It is used to measure the weight of the plates.

Why is percent overgrowth an important measurement in this study?

• It determines the water salinity levels.

• It indicates the amount of sunlight reaching the plates.

• It helps in understanding competition for space among species.

• It measures the growth rate of individual species.

Which of the following organisms is known for having a crusty texture due to calcium?

• Tunicates

• Sea squirts

• Bryozoans

• Marine worms

What is the main reason for using percent cover instead of counting individuals?

• It requires less equipment.

• It provides a more accurate measure of diversity.

• It is difficult to count individuals in colonial organisms.

• It is faster and more efficient.

What is a characteristic feature of spaghetti worms?

• They have tentacles resembling spaghetti.

• They are solitary organisms.

• They have a crusty texture.

• They are found only on three-month plates.