Question

open response: a vast national park has a highway running through the middle of it. the park includes the large and small animals found in a northern woodland ecosystem. many animals crossing the highway have been hit and injured or killed. a team of scientists proposes to fence the highway and build a series of wildlife crossing structures that connect both sides of the park. the structures would include bridges and tunnels landscaped with native plants to simulate the natural environment as animals cross over or under the highway. what is one benefit to these new crossing structures? what is one possible unintended consequence to animal populations from these crossings?

Explanation:

Benefit to new crossing structures:

One benefit is that it can increase the gene flow between animal populations on both sides of the highway. By allowing animals to cross safely, individuals from different groups can mate, which helps maintain genetic diversity. This genetic diversity is important for the long - term survival and adaptability of the species, as it provides a wider range of traits that can be selected for in changing environments. It also helps to prevent inbreeding depression, which can occur in isolated populations with limited genetic variation.

Unintended consequence to animal populations:

An unintended consequence could be the spread of diseases between previously isolated animal populations. When animals from different areas are able to mix more freely due to the new crossing structures, a disease that is present in one population can be transmitted to another population that may have no immunity to it. This could lead to significant die - offs in the newly exposed population and disrupt the balance of the ecosystem within the park. Another possible unintended consequence is the introduction of invasive species (either by animals carrying seeds or by animals themselves being invasive) into new areas. If an animal from an area outside the park (or from a different part of the park with different species) carries seeds of an invasive plant on its fur or in its digestive system, and then crosses into a new area via the crossing structure, the invasive plant could establish itself and outcompete native plants, which in turn would affect the food sources and habitats of the local animal populations.

Answer:

• Benefit: Increased gene flow (maintaining genetic diversity) among animal populations.
• Unintended consequence: Spread of diseases between previously isolated animal populations (or introduction of invasive species affecting local animal populations).