Interactions and relationships among organisms and their environment. This includes biotic and abiotic (non-living/environmental) factors that impact organisms.

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1answer
71 views

What causes tree lines?

There is an area of where there is a distinct line of only trees on one side and only shrubs on the other (right next to each other). What could cause this? My attempt: I said there could be a ...
11
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1answer
106 views

Vaccination and population dynamics of an epidemic

I'm trying to figure out how should a vaccination model be built to correlate with population density, and I'm having problems to understand meanings of the results I receive when I apply theory on ...
3
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2answers
669 views

Does finite rate of increase depend on mortality of individuals in a population?

As written in my lecture handouts, there two main factors in the Geometric Growth Model of populations: $R_{0}$ is the expected lifetime reproductive output. This way, for unicellulars, for example, ...
5
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3answers
126 views

Does the entire surface of the earth contain organisms?

Does the entire surface of the earth contain organisms? My teacher mentioned that in some parts of the earth, there aren't any organism. Is this true? Thanks in advance.
3
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1answer
147 views

Statement about Tropical Rainforests

I made a statement about tropical rainforests, and I want to know if it's somewhat true or not: The soil in tropical rainforests is not exceptionally fertile, because it contains few minerals. The ...
2
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1answer
81 views

What does self-preservation stem from? [closed]

Self-preservation, or preservation anyway, probably happens throughout the animal kingdom, and perhaps through the plant kingdom as well (some plants/trees, apparently, produce chemicals to repel ...
2
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1answer
55 views

What type of biome is this?

There is a region that gets about 812mm of precipitation and is mildly hot all year long. I believe this region is a tropical savanna, but I'm not 100% sure. Is this correct?
4
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2answers
269 views

Why is the floral biodiversity of grazed grassland higher than that of mown grassland?

I have collected some data to compare the biodiversity of a field in which the plagioclimax is maintained by machine mowing with a field in which the plagioclimax is maintained by sheep grazing. What ...
3
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0answers
51 views

Help with designing the analysis of radio telemetry study [closed]

I was wondering if there are any spatial ecologists out there who can provide some insight on the trouble I'm having with my Masters research. I am looking at the association a bat species to high ...
9
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1answer
1k views

Why are some berries poisonous?

In my understanding, the evolutional function of berries is to be eaten and pood out somewhere else, so that the seeds of the plant spread. Is this so? Then why are some berries poisonous?
9
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2answers
139 views

Does artificial high intensity light damage permanently dark ecosystems?

Popular science features on wildlife typically capture camera images using natural light, or high-speed exposures. This is not possible where the ambient light is extremely poor. E.g. Caves, Undersea ...
5
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1answer
230 views

Are there any side-effects from a mosquitoes extinction?

Suppose that we have the ability to make mosquitoes extinct, what would the side-effect of such extinction be other than the fact that there won't be any mosquitoes left? Is it worth it to make ...
11
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3answers
279 views

Most suitable biodiversity index

I am conducting an investigation into the effect of two different grass management techniques (grazing vs. machine-mowing) upon floral biodiversity. I have collected my data and now need to process ...
4
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2answers
179 views

Is there a good field methods book that covers terrestrial ecology?

In the past I have used Limnological Analysis by Wetzel and Likens and Methods in Stream Ecology edited by Hauer and Lamberti to develop labs and research methods for courses and projects with an ...
6
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2answers
219 views

Can I compare Shannon indices of metagenome gene data?

I'm comparing 12 Metagenomes. I'm using HMM counts of a number of proteins known to exists as groups within certain operons. I have grouped the HMM counts for each type of operon and calculated the ...
3
votes
1answer
98 views

How do susceptible organisms prevent parasites from overcoming resistance?

Bt corn is genetically modified to kill borers, but "regulations require farmers to plant conventional varieties as well, which is intended to stop the borers becoming resistant." -Source How do ...
9
votes
1answer
770 views

How does population stability evolve?

The number of individuals constituting a population is called population size. Over time population size does not remain constant, it fluctuates to different extent over generations because of ...
5
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2answers
144 views

Difference between biological control and introducing species for conservation?

I have a biology assignment and we have to explain various methods and strategies for conservation, two of which are: Biological control Introduced Species What is the difference between ...
7
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1answer
78 views

Is there a standard format for plant community composition data?

FIA has a nice database of forest Inventory data, this would be great except that it does not seem capable of handling data from non-tree species (e.g., grasslands, wetlands). Is there a standard ...
7
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1answer
213 views

Compare and contrast “Rubisco activity” and “assimilation rate” (is there a difference, and if so, what is it)?

I am confused about the variable "RuBisCO activity". How is it measured, and is it any different from the net assimilation rate? Based on some background reading (e.g. Kling, 2008; Lambers et al ...
12
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3answers
233 views

When are population dynamics models useful?

When are population dynamics models useful? There seems to have been a lot of research about it, but how does it help? If I need data about how a population will evolve under what conditions, I need ...
13
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2answers
4k views

How will rising carbon dioxide levels in the troposphere affect photosynthetic producers?

Much discussion has been had about the affects of climate change on plantlife, but how will rising carbon dioxide concentrations affect the photosynthetic process itself? Since CO₂ is a reagent in ...
8
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3answers
214 views

Can elements of one's environment act directly as hormones?

Can pollution and things in an organism's environment serve as hormones?
21
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2answers
453 views

Smallest viable reproducing population

What is the smallest viable reproducing population, such as in a human population. By viable I mean a population which keeps genetic defects low (enough). A very strongly related question: what is ...
24
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2answers
378 views

How do biological communities at deep-ocean hydrothermal vents migrate between vents?

Much interest in the astrobiology community has been generated by the discovery of biological communities populating deep-ocean hydrothermal vents (i.e. "black smokers"). (1) These ecosystems rely on ...