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Ch. 51 - Population Ecology
Freeman - Biological Science 7th Edition
Freeman7th EditionBiological ScienceISBN: 9783584863285Not the one you use?Change textbook
All textbooksFreeman 7th EditionCh. 51 - Population EcologyProblem 7
Chapter 51, Problem 7

Explain why biologists want to maintain (a) 'habitat corridors' that connect populations in a metapopulation, and (b) unoccupied habitat that is appropriate for the species in question.

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1. Habitat corridors are important because they allow for the movement of individuals between different populations within a metapopulation. This movement, or gene flow, can help maintain genetic diversity within the metapopulation, which can increase the overall fitness and survival of the species. Without these corridors, populations can become isolated, leading to inbreeding and a decrease in genetic diversity.
2. Habitat corridors also facilitate the recolonization of habitats where local extinctions have occurred. If a population in one habitat patch goes extinct, individuals from another patch can move through the corridor to recolonize the area. This can help maintain the overall size and stability of the metapopulation.
3. Maintaining unoccupied habitats that are suitable for the species is also crucial. These habitats can act as 'refuges' or 'reserves' where the species can survive and reproduce if conditions in their current habitat become unfavorable due to factors like disease, predation, or environmental changes.
4. Unoccupied habitats can also provide opportunities for population expansion when conditions are favorable. If a population grows too large for its current habitat, individuals can disperse to the unoccupied habitat and establish a new population there.
5. In conclusion, maintaining habitat corridors and unoccupied habitats are both important strategies for conserving biodiversity and ensuring the long-term survival of species in a changing environment.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Metapopulation Dynamics

A metapopulation consists of multiple, spatially separated populations of the same species that interact through migration. Understanding metapopulation dynamics is crucial for biologists as it helps them assess how populations can persist over time despite habitat fragmentation. Habitat corridors facilitate gene flow and recolonization, which are essential for maintaining genetic diversity and population stability.
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Habitat Corridors

Habitat corridors are strips of natural habitat that connect isolated populations, allowing for the movement of individuals between them. These corridors are vital for reducing the risks of inbreeding and local extinction by enabling species to access resources, mates, and new habitats. By maintaining these connections, biologists can enhance the resilience of populations against environmental changes.
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Conservation of Unoccupied Habitat

Conserving unoccupied habitat is essential for species recovery and long-term survival. This habitat can serve as potential sites for population expansion or reintroduction efforts, providing safe spaces for species to thrive. By ensuring that suitable habitats are preserved, biologists can support biodiversity and help mitigate the impacts of habitat loss and climate change.
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