Habitat connectivity is the degree to which separate habitat patches are linked so species can move between them and exchange genes, which keeps populations from getting isolated and dying out in fragmented landscapes.
Habitat connectivity is how well-connected the patches of suitable habitat in a landscape are. When patches are linked, animals can move between them to find food, mates, and new territory, and their genes mix across the whole population. When patches are cut off from each other, populations get stranded on little islands of habitat.
That "island" idea is exactly why this term lives in 2.3 Island Biogeography. A forest patch surrounded by farmland or roads acts a lot like a real island surrounded by water. Species have a hard time reaching it, and the ones already there can get stuck. High connectivity makes a fragmented landscape behave like one big habitat. Low connectivity makes it behave like a scatter of isolated islands, where small, cut-off populations are more likely to disappear.
This term supports [AP Enviro 2.3.A], which asks you to describe island biogeography, and connects to [AP Enviro 2.3.B] on its role in evolution. Per EK ERT-2.D.1, island biogeography studies how organisms are distributed and how their communities are structured. Connectivity is the lever that decides whether a habitat patch gets colonized and stays diverse, or stays cut off and loses species. It sits in Unit 2: The Living World: Biodiversity, the unit built around what keeps ecosystems diverse and resilient. The big idea: bigger, better-connected habitats support more species and more stable populations than small, isolated ones.
Keep studying AP® Environmental Science Unit 2
Wildlife corridor (Unit 2)
A wildlife corridor is the real-world fix for low connectivity. It's a strip of habitat (like a wildlife overpass over a highway) that physically links two patches so animals can move between them, raising connectivity on purpose.
Forest fragmentation (Unit 2)
Fragmentation is what destroys connectivity. When a road or development chops a forest into pieces, each piece becomes more island-like, and the species inside lose the ability to mix with neighboring populations.
Edge effects (Unit 2)
Breaking habitat into small disconnected pieces creates more edge, where conditions like light, wind, and predators differ from the interior. So poor connectivity and edge effects usually show up together and hit interior species hardest.
Endemic species (Unit 2)
EK ERT-2.E.1 notes island species often evolve as specialists. These endemic specialists depend on connectivity the least naturally but are hurt the most when isolation lets invasive generalists outcompete them.
Expect this in multiple-choice questions about why smaller or more isolated islands (and habitat patches) lose more biodiversity. A classic stem asks which principle of island biogeography explains greater biodiversity loss on the smaller island, and the answer logic runs through size, isolation, and connectivity. On free-response, you'd use connectivity to explain or propose a solution, for example arguing that building a wildlife corridor restores gene flow between two fragmented populations. The move is to connect a human action (roads, deforestation, development) to reduced connectivity and then to the population or biodiversity consequence.
Habitat connectivity is the condition (how linked patches are). A wildlife corridor is one specific tool that creates connectivity. Connectivity can be high naturally with no corridor needed, but if patches are cut off, a corridor is the engineered way to boost it. Don't write "corridor" when the question is really asking about the broader idea of connectivity, or vice versa.
Habitat connectivity measures how linked habitat patches are, which controls whether species can move between them and exchange genes.
Low connectivity turns a fragmented landscape into a set of isolated islands, and small isolated populations are more likely to go extinct.
This term lives in topic 2.3 Island Biogeography because a habitat patch surrounded by human land acts like an island surrounded by water.
A wildlife corridor is the engineered solution that raises connectivity, while forest fragmentation is the process that destroys it.
On the exam, link a human activity to reduced connectivity and then to a clear biodiversity or population outcome.
It's the degree to which separate habitat patches are linked so species can travel between them and breed, keeping gene flow going. It appears in topic 2.3 Island Biogeography because disconnected patches behave like isolated islands.
No. Connectivity is the overall condition of how linked patches are. A wildlife corridor is one specific structure (like a habitat bridge over a road) used to raise connectivity between two patches.
Isolated patches act like small islands, so populations can't mix, gene flow drops, and inbreeding rises. Smaller, more isolated populations face higher extinction risk, which is the core lesson of island biogeography.
Roads, farms, and development slice a continuous habitat into pieces, cutting the pathways animals used to move between areas. Each piece becomes more island-like, lowering connectivity and increasing edge effects.
It shows up in island biogeography questions about why smaller or more isolated patches lose more biodiversity, and in FRQs where you propose solutions like wildlife corridors to restore gene flow between fragmented populations.
Connect this key term to the AP exam workflow: review the course, practice questions, and check related study tools.
Review units, study guides, and course resources.
Check this vocabulary in multiple-choice context.
Apply key concepts in written AP responses.
Estimate the exam score you are working toward.
Review the highest-yield facts before practice.
Put the full course together before test day.