Science · Year 6 · Biological Adaptations and Survival · Term 1

Environmental Change and Species Impact

Analyzing how changes to physical conditions in a habitat affect the species living there.

• ACARA Content Descriptions
• AC9S6U01

About This Topic

Environmental changes, whether natural or human-induced, can have profound effects on the survival of species. This topic examines how shifts in temperature, water availability, or habitat loss force organisms to adapt, move, or face extinction. In the Australian context, this includes studying the impact of bushfires, droughts, and rising sea levels on our unique biodiversity.

Students will explore how the rate of change is a critical factor in survival. This connects to the broader curriculum by linking biological sciences with geography and sustainability. It also involves looking at how Indigenous land management practices, such as cultural burning, have historically helped maintain environmental balance. Students grasp this concept faster through collaborative problem-solving where they must predict the outcomes of different environmental scenarios.

Key Questions

1. Predict the long-term consequences for a species when its environment changes rapidly.
2. Assess how human activities inadvertently influence the survival rates of local wildlife.
3. Hypothesize which species are most vulnerable to rising global temperatures and justify your reasoning.

Learning Objectives

• Analyze the impact of specific environmental changes, such as drought or increased rainfall, on the survival rates of Australian native species.
• Evaluate the effectiveness of different adaptation strategies for species facing rapid environmental shifts.
• Predict the long-term consequences for a species when its habitat undergoes significant alteration.
• Justify hypotheses regarding species vulnerability to rising global temperatures based on biological characteristics.

Before You Start

Characteristics of Living Things

Why: Students need to understand the basic needs of living organisms (food, water, shelter) to analyze how environmental changes affect them.

Habitats and Homes

Why: A foundational understanding of what a habitat is and the components it provides is necessary before analyzing changes to it.

Key Vocabulary

Habitat	The natural home or environment of an animal, plant, or other organism. It provides food, water, shelter, and space for survival.
Adaptation	A trait or characteristic that helps an organism survive and reproduce in its specific environment. Adaptations can be physical, behavioral, or physiological.
Biodiversity	The variety of life in a particular habitat or ecosystem. High biodiversity generally indicates a healthy and resilient environment.
Extinction	The complete disappearance of a species from Earth. This occurs when all individuals of a species have died.
Vulnerability	The degree to which a species is susceptible to harm or negative impacts from environmental changes or threats.

Watch Out for These Misconceptions

Common Misconception

All environmental changes are bad for all species.

What to Teach Instead

Students often think change only causes harm. Use examples like fire-stimulated seed germination to show that some species have adapted to benefit from specific types of environmental change, provided the frequency is natural.

Common Misconception

Species can adapt to any change if they try hard enough.

What to Teach Instead

This is a common misunderstanding of evolution. Peer discussion about the 'rate of change' helps students realize that if an environment changes too quickly, species cannot adapt fast enough and may become extinct.

Active Learning Ideas

Collaborative Problem-Solving: Habitat Rescue

Provide groups with a 'habitat map' and a sudden change card (e.g., 'A new road is built' or 'A flood occurs'). Students must work together to predict which resident species will survive based on their known adaptations and propose a management plan.

50 min·Small Groups

Mock Trial: The New Development

Students take on roles such as town planners, ecologists, local residents, and First Nations elders to debate a proposed building project on a local wetland. They must argue how the environmental change will impact local species' survival.

60 min·Whole Class

Think-Pair-Share: Fire and Regrowth

Show images of Australian bushland before and after a fire. Students think about how specific plants (like Banksias) use fire to survive, then pair up to discuss how changing fire frequencies might affect these species in the long term.

20 min·Pairs

Real-World Connections

• Conservation biologists working with organizations like Zoos Victoria study the effects of climate change on koala populations, developing strategies to protect their eucalyptus habitats from bushfires and habitat fragmentation.
• Environmental consultants assess the impact of new infrastructure projects, such as dams or urban developments, on local river ecosystems and the fish species that inhabit them, recommending mitigation measures.
• Researchers at CSIRO investigate how rising sea levels and ocean acidification affect marine life along the Great Barrier Reef, advising on management plans to protect coral and fish populations.

Assessment Ideas

Discussion Prompt

Pose the question: 'Imagine a native Australian frog species lives in a wetland that is experiencing prolonged drought. What are three specific challenges this frog might face, and what adaptations could help it survive?' Facilitate a class discussion, encouraging students to share their ideas and justify their reasoning.

Quick Check

Provide students with a short case study about a human activity, such as clearing land for agriculture near a coastal area. Ask them to write two sentences identifying a local wildlife species likely to be affected and one way its survival rate might be influenced.

Exit Ticket

On an index card, have students draw a simple diagram of a habitat. Then, ask them to label one environmental change (e.g., increased temperature, pollution) and draw an arrow to an organism in their habitat, writing one word to describe how that change impacts the organism's survival.

Frequently Asked Questions

How does climate change affect Australian wildlife?

Climate change can lead to more frequent extreme weather, such as heatwaves and droughts. For many Australian species, like the Mountain Pygmy-possum, even a small rise in temperature can disrupt their hibernation cycles and food availability.

What is cultural burning and how does it help?

Cultural burning is a traditional First Nations practice of using low-intensity fires to manage the land. It reduces fuel loads to prevent massive bushfires and promotes the growth of specific plants, helping to maintain a healthy and balanced environment.

Can animals move to a new habitat if theirs changes?

Some can, but it depends on 'connectivity.' If a habitat is surrounded by cities or farms, animals may be trapped. This is why creating wildlife corridors is a major focus for scientists in Australia today.

How can active learning help students understand environmental impact?

Active learning, like simulations and role-plays, allows students to see the 'cause and effect' of environmental changes in real-time. Instead of just hearing about extinction, they can model how a lack of resources leads to population decline, making the science much more tangible.