--- title: "Species Distribution & Change" description: "Explain how environmental change (climate change, habitat loss, pollution) affects the distribution of species, including range shifts, local extinction, and invasive species" canonical: https://lightmysky.com/learn/science/species-distribution-and-change-mt_JSUGQ5Repv source: https://lightmysky.com/learn/science/species-distribution-and-change-mt_JSUGQ5Repv.md retrieved: 2026-11-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Species Distribution & Change Explain how environmental change (climate change, habitat loss, pollution) affects the distribution of species, including range shifts, local extinction, and invasive species Subject: Science · Area: Ecosystems & Habitats · Ages 12 to 13 Page: https://lightmysky.com/learn/science/species-distribution-and-change-mt_JSUGQ5Repv ## Ready when they can - Describes at least two ways environmental change can affect species distribution - Gives a real example of a species whose range has shifted due to climate change - Explains what an invasive species is and how environmental change can enable invasions - Discusses why some species are more vulnerable to environmental change than others ## Lesson: Species on the Move A species' distribution is where it lives. Climate change, habitat loss and pollution can make places unsuitable. A range may expand into suitable new areas or shrink as populations disappear. Local extinction means a species disappears from one area but survives elsewhere. Global extinction means no individuals remain anywhere. Losing one habitat does not always mean losing the whole species. **Example.** The comma butterfly has expanded its range northwards in Britain as the climate has warmed. Warmer conditions have helped it survive and breed in northern areas. A population's range changes as individuals spread and reproduce. This does not mean that every butterfly makes a single long journey from the old range to the new one. *(drawing: Invented survey data: a northern boundary lies 0 km, then 80 km north of one reference point. These are not comma butterfly measurements.)* **Example.** To measure a boundary shift, compare positions measured from the same reference point. Subtract the earlier position from the later one. In the invented survey, 80 minus 0 is 80 km. The northern boundary has shifted 80 km north. A boundary shift measures a change in distribution, not how far one animal travelled. An invasive species is introduced outside its native range and causes, or can cause, harm there. It may compete with native species, eat them or spread disease. A native species expanding its range is not automatically invasive. Environmental change can help an introduced species survive: milder winters may remove a cold barrier. Transport explains how it arrives; suitable conditions help it establish. A specialist depends on a narrow set of foods or conditions. If its only food plant disappears, it has fewer feeding options than a generalist that can use several remaining foods. This can make it more vulnerable to that change. A varied diet can help, but it does not guarantee survival if other needs are not met. Suitable habitat is useful only if a species can reach it. A road may block a small land animal even when food and shelter remain on both sides. A usable wildlife crossing can reconnect those areas. Movement also depends on distance and the species' abilities. Connecting habitats can help some species move, but the destination must still meet their needs. **Recap.** Environmental change can expand or shrink ranges and cause local extinction. It can help introduced species establish. Food needs and access to suitable habitat affect survival. *Lesson revisions, questions and flashcard revisions written for this dataset. Survey numbers are invented teaching examples, not measurements of the comma butterfly.* ## Practice 8 questions on this page, each with its working shown. ## Needs first - [Changing Environments](https://lightmysky.com/learn/science/changing-environments-mt_Wyd-l-6H7G) ## Optional connections - [Food Webs & Interdependence](https://lightmysky.com/learn/science/food-webs-and-interdependence-mt_URTJbS3hhs) ## Opens up - [Extinction & rapid change](https://lightmysky.com/learn/science/extinction-and-rapid-change-mt_-r3B4FQyX3) - [Sampling ecosystems with quadrats and transects](https://lightmysky.com/learn/science/sampling-ecosystems-with-quadrats-and-transects-mt_jI8rAOYdmb) - [Biodiversity & Resilience](https://lightmysky.com/learn/science/biodiversity-and-resilience-mt_xSs0xAd6i1)