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Chapter 35: Problem 67

Global climate change has led to butterflies emerging earlier and amphibians mating earlier in the United Kingdom. What impact is it most likely to have on their populations in the next few years? a. There will be no impact on butterfly and amphibian population. b. Their numbers will definitely decline with rising temperatures. c. Their numbers will decline as their plant hosts of butterflies may not flower earlier and young amphibians may not be viable as there might be a lack of water. d. It is hard to predict what will happen to their populations as there are no similar studies.

Short Answer

Expert verified
c. Their numbers will decline due to mismatched timing with plant hosts and potential water shortages for young amphibians.

Step by step solution

01

- Understanding the Context

First, consider the effects of global climate change on the behaviors of butterflies and amphibians, specifically their earlier emergence and mating times.
02

- Analyzing Potential Impacts

Identify the potential consequences of earlier emergence for butterflies and earlier mating for amphibians. Think about factors like food availability, plant flowering times, and water resources.
03

- Comparing Answer Choices

Review the provided answer choices and assess which one aligns best with the likely impacts identified in step 2.
04

- Selecting the Best Answer

Based on the analysis, the answer that most logically follows from the identified consequences of global climate change is option c: their numbers will decline as their plant hosts of butterflies may not flower earlier and young amphibians may not be viable as there might be a lack of water.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Early Emergence
Global climate change is causing many species to adjust their life cycles. One significant change includes earlier emergence times. For example, butterflies are now emerging earlier in the United Kingdom. Such shifts can disrupt the delicate balance of ecosystems.

Early emergence can lead to mismatches in life cycles between species. Butterflies might come out of hibernation before their food sources, such as nectar-producing plants, are available. This can lead to a lack of food, which affects their survival and reproduction.
Amphibian Mating
Climate change is also prompting amphibians to begin their mating seasons earlier. This change, while seemingly minor, can have major repercussions. Amphibians rely on specific environmental conditions for successful mating and the subsequent development of their offspring.

When amphibians mate earlier due to warmer temperatures, their eggs and larvae may be exposed to conditions they are not adapted to handle. For instance, there may be insufficient water in ponds and streams, leading to higher mortality rates among amphibian young. This results in fewer adults reaching maturity and reproducing the next season.
Population Decline
The combined effects of early emergence and mating can lead to population declines. Species like butterflies and amphibians are particularly vulnerable because their life cycles are closely tied to environmental conditions.

With butterflies, a lack of synchrony with their host plants can mean less food for caterpillars, lowering survival rates. Similarly, early mating in amphibians can result in lower offspring viability due to unstable water resources. These factors can reduce the overall population of both species, causing long-term ecological impacts.
Food Availability
Food availability plays a crucial role in the survival of species. When climate change causes butterflies to emerge early, their primary food sources, like flowering plants, may not yet be blooming. This mismatch can lead to starvation and a decrease in butterfly populations.

Amphibians face a similar dilemma. If their prey, such as insects, do not appear when needed due to unsynchronized life cycles, it can result in insufficient food for growing larvae. Consistent food shortages can weaken populations over time.
Water 91影视
Water is vital for many life forms, and amphibians are especially dependent on it for reproduction and survival. Global climate change can lead to less predictable and often reduced water availability. Early mating caused by warmer temperatures can lead to amphibian eggs and larvae developing in less stable and insufficient water conditions.

If ponds and streams dry up early, young amphibians may not survive to adulthood. This lack of water can not only reduce the current populations but also impact future generations, further contributing to population declines.

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