Competition typically increases with the density of nearby individuals. However, studies suggest that killifish, in some circumstances, prefers to associate with more rather than fewer fish. What can explain this observation?

Question

BlackTom AI · Accepted Answer

In crowding-related behavioral ecology questions, we weigh how density affects fitness and social choices.
Option 1: Frequency-dependent selection. This concept describes how the fitness of a phenotype depends on its frequency in the population, not directly on population density or the number of nearby conspecifics. While frequency effects can shape traits, it doesn’t specifically explain a tendency to associate with more individuals as density changes.
Option 2: Allee effect. This is the best fit here: at low densities, individuals may experience reduced fitness because mate finding, cooperative foraging, or predator dilution benefits are diminished. As density increases, these advantages improve until other costs (competition, disease) kick in. The observed preference for more, rather than fewer, fish in certain contexts aligns with density-dependent fitness gains characteristic of the Allee effect.
Option 3: Disruptive selection. This form of selection favors extreme phenotypes over intermediate ones, which can generate bimodal trait distributions, but it does not address the positive relationship between individual fitness and increasing local density or social association.
Option 4: Mimicry. Mimicry involves resembling another species or trait to gain advantages such as reduced predation. It is typically unrelated to the general social preference for more conspecifics driven by fitness benefits at certain densities, so it does not explain why killifish would cluster with higher numbers based on density alone.
In summary, only the Allee effect specifically captures the phenomenon where individuals benefit from higher local density, motivating association with more fish in particular circumstances, whereas the other options describe different evolutionary or ecological mechanisms that do not directly address density-related social aggregation.

Competition typically increases with the density of nearby individuals. However, studies suggest that killifish, in some circumstances, prefers to associate with more rather than fewer fish. What can explain this observation?单项选择题

类似问题

BONUS QUESTION (This question is worth 2 extra points, which will be added to your score manually within the next two weeks.) A population demonstrating the strong Allee effect, present only in the critical depensation model, occurs:

Which point corresponds to the Allee threshold in Fig. 4? Fig. 4 Population Model

A project has a required return of 12.6 percent, an initial cash outflow of $42,100, and cash inflows of $16,500 in Year 1, $11,700 in Year 2, and $10,400 in Year 4. What is the net present value?

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