Problem 2 - Campbell Biology Concepts & Connections

Question

Which of these statements best describes what conservation biologists mean by the "the rapid loss of biodiversity"? a. Introduced species, such as starlings and zebra mussels, have rapidly expanded their ranges. b. Harvests of marine fishes, such as cod and bluefin tuna, are declining. c. The current species extinction rate is as much as 100 times greater than at any time in the past 100,000 years. d. Many potential medicines are being lost as plant species become extinct.

Step-by-Step Solution

Answer

c. The current species extinction rate is as much as 100 times greater than at any time in the past 100,000 years.

Step 1: Understand the Concept of Biodiversity

Biodiversity refers to the variety of life in the world or in a particular habitat or ecosystem. It includes the number of species of plants, animals, and microorganisms, their genes, and the ecosystems they form.

Step 2: Analyze the Term 'Rapid Loss of Biodiversity'

'Rapid loss of biodiversity' means a significant and swift decline in the variety of life forms within a particular area or globally. It generally refers to the extinction rate and the disappearance of species.

Step 3: Review Each Option

a. Introduced species expanding their ranges is more about invasive species than biodiversity loss.b. Declining fish harvests refer to overfishing, which is related but not specifically describing rapid biodiversity loss.c. An extinction rate 100 times greater than the historical rate clearly describes a rapid loss of biodiversity.d. The loss of potential medicines highlights the importance of biodiversity but does not directly describe rapid biodiversity loss.

Step 4: Select the Best Statement

Option c, 'The current species extinction rate is as much as 100 times greater than at any time in the past 100,000 years,' directly addresses the concept of rapid loss of biodiversity since it discusses how quickly species are becoming extinct.

Key Concepts

Biodiversity

Biodiversity describes the variety of life on Earth, encompassing all the different species of plants, animals, microorganisms, and the genetic differences within these species. It also includes the ecosystems within which these organisms live and interact. Biodiversity is essential because it ensures the stability and resilience of ecosystems. High biodiversity increases the ability of an ecosystem to recover from disturbances, such as natural disasters or human activities, while supporting processes such as pollination, nutrient cycling, and soil formation.

Species Extinction

Species extinction occurs when a species no longer exists anywhere on Earth. Currently, the rate of species extinction is alarmingly high, largely due to human activities like habitat destruction, climate change, overexploitation, and pollution. When species become extinct, it disrupts ecosystems and the services they provide, affecting food security, health, and the global economy. Unlike natural extinction events that unfold over millions of years, the current rate is rapid and can result in significant biodiversity loss in a short period.

Ecosystem Diversity

Ecosystem diversity refers to the variety of ecosystems in a given place. It includes different habitats, biological communities, and ecological processes. For example, a region rich in ecosystem diversity might contain forests, wetlands, grasslands, and coral reefs. Each ecosystem supports unique species and plays a role in maintaining healthy environmental conditions. Ecosystem diversity is crucial for providing ecosystem services like water purification, climate regulation, and food production. Loss of ecosystem diversity can lead to the collapse of ecological networks and the services they offer.

Conservation Biology

Conservation biology is a field of science focused on understanding and preserving biodiversity. It involves studying species and ecosystems, assessing the impacts of human activities, and developing strategies to protect and restore biodiversity. Conservation biologists work on various efforts including creating protected areas, restoring habitats, breeding endangered species, and enacting policies that mitigate environmental threats. Their ultimate aim is to prevent species extinction, protect ecosystem diversity, and ensure that natural habitats continue to function effectively for future generations.