Question

use the information in table 1 and figure 1 to answer the question. which change is most responsible for the decline of the kit fox population? a an increase in predator habitat due to reduced competition b a reduction in carrying capacity due to habitat loss c a reduction in carrying capacity due to decreased temperatures d an increase in insect populations due to agriculture
information about kit fox ecology and your knowledge of science to answer questions.
table 1. san joaquin kit fox characteristics
envied habitat: deserts, open grasslands, prairies, scrub lands
size: about the size of a house cat
diet: small rodents, lizards, birds, insects
behavior: hunts at night; digs in soft soil to make underground dens
reproduction: two to six pups each year
predators: red foxes, coyotes, bobcats, raptors
other threats: habitat loss from human encroachment; use of pesticides and poisons
1800s, the san joaquin valley of california was mostly open grassland and marshes with sparsely wooded areas. today, humans have changed much of the central valley cultural and urban use. figure 1 shows the results of a study about how a portion of county in the central valley changed over time.

Explanation:

To determine the cause of the kit fox population decline, we analyze each option:

• Option A: The kit fox is a predator, so an increase in predator habitat (for other predators) would likely increase competition, but the text mentions human encroachment reducing kit fox habitat, not predator habitat. Eliminate A.
• Option B: The passage states humans changed the Central Valley (kit fox habitat) with urban/cultural use, and Table 1 shows "habitat loss from human encroachment" as a threat. Carrying capacity (max population an environment can support) decreases with habitat loss. This matches.
• Option C: The text doesn't mention temperature changes affecting the kit fox. Eliminate C.
• Option D: The kit fox hunts insects, so an increase in insects would likely help, not harm, the kit fox population. Eliminate D.

Answer:

B. a reduction in carrying capacity due to habitat loss