1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
hammer [34]
3 years ago
12

A wildlife biologists has adopted a number of techniques to protect the Willow Flycatcher, a bird that often nests and feeds in

willows. Some techniques reflect top-down while some reflect bottom up control. Which of the following approaches demonstrates her understanding of how top-down forces affect community dynamics?
A) The biologists attempts to increase food availability by reintroducing beaver. She hypothesized that beaver will raise the water table, stimulating the growth of willow, which will result in an increase in insect abundance, giving flycatchers more food.
B) Willow Flycatchers can lose eggs to squirrels, weasels, and other predators. The biologist attempts to protect nests by putting metal collars around the base of the windows that keep ground predators from climbing up to reach the nests.
C) Both approaches rely on bottom-up forces.
D) Neither approach relies on bottom up forces.
Biology
1 answer:
Ilia_Sergeevich [38]3 years ago
3 0

Answer:

B) Willow Flycatchers can lose eggs to squirrels, weasels, and other predators. The biologist attempts to protect nests by putting metal collars around the base of the windows that keep ground predators from climbing up to reach the nests.

Explanation:  

The dynamic of a species depends on its interaction with other species. So in species management plans, among other aspects, it is important to know the trophic webs in which a species is involved and the interactions of that taxonomic group with the others in the chain.

Top-down techniques take decisions from the most global variables to the most inferior or specific ones. When referring to the trophic web, the most global variables are related to top predators, while the most inferior ones are related to the first levels of the chain.

If the researcher needs to adopt a top-down technique, the most suitable one to choose is to protect the Flycatcher´s nests from predators. Predators are the carnivores in the chain that feeds on the Flycatchers´ eggs. This action will interrupt the link between the superior predators and the flycatchers, allowing this last species to recover its population size.  

You might be interested in
Adding all the three primary colors-red, green, and blue-at maximum intensity produces the color _____, while adding any two of
emmasim [6.3K]

Answer:

White

Explanation:

Some times when we look at some objects they appear to be different in color to us than their actual color. It may be due to several wavelength of  light with different intensities is striking on our eye.

Remember, white is not a color it is just produced in response to combination of 3 or more than three colors like light.

The three colors that can be combined at full intensity to form a white color are called as primary colors. The most common set is

               Red+Green+Blue= white

Zero intensity of each component gives darkest color and full intensity of any component give a white color.

Secondary colors can be produced by the addition of two colors such as;

                Red+Green=Yellow

                Red+Blue=Magneta

                Green+Blue=Cyan

5 0
3 years ago
How do cultural traits, cultural complexes, and cultural patterns differ?
Lady bird [3.3K]
Cultural traits are the individual elements or smallest units of culture. It is these traits, which distinguish one culture from another. A cultural pattern is formed when traits and complexes become connected to each other in Tylor’s definition lay in his “complex whole” formulation, it varied cultures of different peoples or societies. While cultural complexes is a group of cultural traits that are all interrelated and dominated with one essential trait. To make substantial and accurate comparisons between cultures, lives are always entangled in complex patterns of work and family, power and meaning, they also focus a lot on the differences between every person it was discovered that physical traits that had been used to.
5 0
3 years ago
Read 2 more answers
Which structure is often modified to attract pollinators?
aivan3 [116]
Flowers that are in bunches and bright in color may apply pollinators
6 0
3 years ago
How does one determine when an ecosystem is in balance
liubo4ka [24]
An ecosystem<span> is </span>balanced<span> when the natural animals and plants and non-living components are in harmony- i.e. there is nothing to disturb the </span>balance<span>. With increasing pollution, change in migratory patterns, and rise of human population, many </span>ecosystems<span> are in danger of losing that harmony.</span>
8 0
3 years ago
Read 2 more answers
Instructions: Select the correct layers. Identify the intrusions in the rock layer.
bagirrra123 [75]
The <span>intrusions in the rock layers would be H and J.
</span>Intrusions are formed by crystallization of magma infiltrations inside the Earth's crust. These intrusions happen as magma ascends slowly from within the Earth penetrating any space or fissure that it can find. Because this process is so slow, as pressure is released and temperature decreases, magma solidifies and crystallizes into solid intrusive rocks. They are usually the "layers" that brake through others and appear across several other layers in a different orientation than those.
8 0
3 years ago
Other questions:
  • Which diagram in figure 32-2 shows an example of a joint involved in lifting your arms above your head?
    6·1 answer
  • Someone help me plz
    10·1 answer
  • 1. Which of the following structures in the diagram below enables the observer to identify that it is a plant cell? a. 1 and 3 b
    14·1 answer
  • How did you classify the materials?​
    14·2 answers
  • Which of the following provides the best comparison between reptiles and fish?
    6·2 answers
  • Cells that contain a full set of chromosomes,or pairs of each chromosomes are?
    7·1 answer
  • Why should we be concerned about the increase in amount of the green house gases in the atmosphere?
    12·1 answer
  • Without the nervous system you couldn't
    15·1 answer
  • Animal Cell definition
    12·2 answers
  • Which statement best describes the process of natural selection?​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!