You collect giving-up density (GUD) data from three identical patches spaced 5 m apart in the environment at locations A, B, and C. Patch A is harvested to the lowest GUD, while patches B and C are harvested to the same higher GUD. Using the predictions of the ideal patch-use model, what can you conclude about the foraging costs at each site based on these data?

Question

You collect giving-up density (GUD) data from three identical patches spaced 5 m apart in the environment at locations A, B, and C. Patch A is harvested to the lowest GUD, while patches B and C are harvested to the same higher GUD. Using the predictions of the ideal patch-use model, what can you conclude about the foraging costs at each site based on these data?

BlackTom AI · Accepted Answer

We start by listing the question in our own terms: three identical patches A, B, and C are 5 m apart. Patch A is harvested to the lowest GUD, while patches B and C are harvested to the same higher GUD. We are to infer the relative foraging costs at each site using the ideal patch-use model.
Option 1: 'Foraging costs are highest at location C.' The data show that A has the lowest GUD, and B and C share a higher but equal GUD. In the ideal patch-use framework, lower GUD indicates higher foraging costs (more prey removed per visit, faster depletion, or higher handling/search costs) at that patch, while higher GUD indicates lower foraging costs because the patch is less profitable per unit time. Since A has the lowest GUD, the foraging costs at A are not highest; thus this option is inconsistent with the data.
Option 2: 'Foraging costs are the same at all locations.' The GUD values differ: A has the lowest GUD, whereas B and C have higher GUD values that are equal to each other. If costs were identical across all locations, we would expect identical GUDs (or at least no systematic difference between A and the others). The observed difference between A and B/C indicates that costs are not the same everywhere, so this option is incorrect.
Option 3: 'Foraging costs are highest at location B.' This would require B to have the lowest GUD or for B to be less profitable per unit time than A or C in a way that differs from A. However, the pattern described is that A is harvested to the lowest GUD (indicating highest costs), while B and C share a higher GUD (indicating lower costs relative to A). Therefore, saying costs are highest at B contradicts the given information, where A shows the highest apparent foraging costs.
Option 4: 'Foraging costs are lowest at location A.' Since GUD is a proxy for foraging costs in the ideal patch-use model (lower GUD corresponds to higher foraging costs, higher GUD corresponds to lower costs), the statement that costs are lowest at A would imply A has the highest GUD, which is not the case. The data actually show A has the lowest GUD, meaning A has the highest foraging costs, not the lowest; thus this option is incorrect.
Summary: the observed pattern—A with the lowest GUD, B and C with the same higher GUD—points to the conclusion that foraging costs are greatest at A and lower and equal at B and C, rather than the alternatives proposed. The reasoning hinges on the inverse relationship between GUD and foraging costs in the ideal patch-use model and the direct tie between lower GUD and higher costs.

类似问题

Using information below, determine which diet should be preferred by foragers? Food items Energy (j) Search time (s) Handling time (s) A 20 10 10 B 40 20 10 C 60 30 10

When does the marginal value theorem predict an animal will switch between patches? If animals have an idea of the distance and profitability of food patches in their surroundings and food patches have the same profitability, they should …

You own a bond that pays $64 in interest annually. The face value is $1,000 and the current market price is $1,021.61. The bond matures in 11 years. What is the yield to maturity?

Which of the following statements is CORRECT?

It will cost $9,600 to acquire an ice cream cart that is expected to produce cash inflows of $3,600 a year for three years. After the three years, the cart is expected to be worthless. What is the payback period?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单