Marine Biology: Coral Reefs, Biodiversity, and Threats

Abiotic factors affecting coral distribution

Factors such as dissolved oxygen, light availability, salinity, temperature, substrate, aragonite, and low levels of nitrates and phosphates that influence where corals can thrive.

How do abiotic factors affect coral reef distribution?

Abiotic factors determine the environmental conditions necessary for coral growth, influencing their geographic distribution and health.

Types of corals

Corals are categorized into soft corals and hard corals, with hard corals being further divided into reef-forming and non-reef forming types.

Anatomy of reef-forming hard coral

Includes components such as skeleton, corallite, coelenteron, coral polyp, tentacles, nematocyst, mouth, and zooxanthellae.

Symbiotic relationships in corals

Coral polyps and zooxanthellae engage in a mutualistic relationship where zooxanthellae provide energy through photosynthesis while corals offer protection and nutrients.

Coral reef growth

The growth of coral reefs relies on accretion processes (growth) being greater than destructive processes (erosion and damage).

Structure and function of coral anatomy

Coral anatomy is structured to support both the physical structure of the reef and the biological functions necessary for survival and reproduction.

Types of diversity in ecosystems

Includes genetic diversity, species diversity, and ecosystem diversity, each contributing to the resilience and functionality of ecosystems.

Species diversity

Described in terms of species richness (the number of different species) and evenness (the relative abundance of each species).

Simpson's diversity index

A mathematical formula used to calculate species diversity, taking into account both species richness and evenness.

Threats to the Great Barrier Reef

Includes increasing sea surface temperatures, rising sea levels, ocean acidification, runoff, and pest outbreaks.

Shelford's law of tolerance

Describes the range of environmental conditions (optimum range, zone of physiological stress, and zone of intolerance) within which a species can survive.

Thermal threshold data for reefs

Data that indicates the temperature limits for coral survival, helping to predict the likelihood of coral bleaching events in different sections of the Great Barrier Reef.

Crown of Thorns Starfish (COTS)

A species of starfish known for its destructive impact on coral reefs; its lifecycle includes phases that can lead to outbreaks.

Abiotic factors leading to COTS outbreaks

Factors such as water quality that can contribute to the proliferation of Crown of Thorns Starfish on the Great Barrier Reef.

COTS and anthropogenic factors

Crown of Thorns Starfish are naturally occurring, but human activities can exacerbate their populations and lead to outbreaks.

Data analysis on COTS

Involves interpreting research data to understand the impact of Crown of Thorns Starfish on coral reef ecosystems.

Outbreaks of COTS

Involves the identification and discussion of abiotic factors affecting the outbreaks of Crown of Thorns Starfish on the Great Barrier Reef.