Introduction to Marine Biology: Christmas Island Crabs

These flashcards cover key concepts, facts, and details about Christmas Island crabs discussed in the marine biology lecture.

What is Gecarcoidea natalis commonly known as?

Christmas Island red crab.

What are land crabs?

Crabs that live independent of water; they can survive for parts of their lifecycle outside water.

What adaptations allow crabs to survive out of water?

Behavioural, morphological, physiological and biochemical adaptations.

Where is Christmas Island located?

10°26'49.85" S 105°40'06.48" E.

How many species of land crabs are found on Christmas Island?

33 land crab species, with 6 being endemic.

What triggers the migration of the red crabs?

The arrival of the wet season rains.

What is the significance of the red crab's migration?

It plays a crucial role in the breeding cycle and ecosystem dynamics.

What physiological changes occur in migrating crabs?

Increased energy metabolism and hormonal regulation.

What is Crustacean Hyperglycaemic Hormone (CHH)?

A hormone that regulates blood glucose levels and energy during migration.

What effect does salinity have on CHH levels in crabs?

Salinity significantly affects circulating CHH in crabs.

What solutions are being implemented to protect migrating crabs from road traffic?

Building bridges and barriers to prevent vehicle entry during migration.

What are the conservation challenges faced by the crabs?

Road traffic, invasive 'crazy' ants, and climate change.

What happens during the larval stage of crabs?

Larvae develop and eventually return to shore after approximately 30 days.

What are the potential spawning dates for red crabs in 2024/25?

November 25-26, December 26-27, and January 24-25.

Who conducted research on the land crabs in the lecture?

Mrinalini and Dr. Lucy Turner.