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Questions tagged [community-ecology]

Sub-field of ecology that studies populations of different species living in a common environment, hence potentially interacting and subjected to similar abiotic elements.

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What are the predators of Glaucus atlanticus?

I'm researching the Glaucus atlanticus, also known as the blue glaucus, among various other names, but after reading quite a few articles and searching on the Internet as many different ways as I can ...
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System diagrams showing biofeedback processes or interactions (- and + symbols) in ecosystems

Overview: I apologise profusely for asking a silly question, but I am feeling confused and I am seeking more clarity on this subject. Could anyone, please help me understand why the interaction ...
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Is spiders building webs on plants an example of mutualism or commensalism?

In one section of the GED study book I'm looking through to prepare myself for exams, they define parasitism, mutualism, and commensalism, and give examples. One of the examples they give for ...
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Can multiple cetacean species communicate?

It seems that individuals within the same species have their own communication, but is there evidence to suggest that individuals from different species are able to communicate?
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Devonian Fish Diversity--What Would it Have Looked Like?

For 70 million years, the oceans, lakes and rivers of the world teemed with seven groups of fish: Placodermi Acanthodii Agnatha Chondrichthyes Sarcopterygii Actinopterygii Now two of those ...
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Book about ordination in ecology

This is a question I posted on Cross Validated few weeks ago but no response has been given so far. I am looking for a book that would cover a lot of different ordinations techniques (indirect ...
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Is urban beekeeeping harmful or are there good practices to follow?

I have found several newspaper articles on how good could be urban beekeeping both for the bees and for agriculture. Today I read this one: Urban beekeeping is harming wild bees saying that urban ...
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301 views

Did the construction of the Panama Canal lead to a huge change in the local marine ecology?

Before the Panama Canal opened in 1914, its two ends were only 77 km apart over land, but the closest sea route was 32,000 km long (around the entirety of South America) and passed through much colder ...
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Is there any research on wolf and bobcat interactions?

I'm studying interactions between North American predators, specifically wolves, coyotes and bobcats. There's evidence from data I've collected from game cameras that suggests a significant ...
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Have there ever been as many mammals as there are now?

I apologize for the weird question, but based on a Google search it looks like this topic hasn't been discussed before. I'm hoping that enough information about population biology is stored in the ...
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111 views

R nought calculation ( SIR model)

1 person gets bitten by 9vectors /night, the vector transmits the pathogen to 0.035 new hosts. Duration of infection: 9.5 months.What is R0? I am struggling with this question for ages as I would ...
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162 views

Species richness corrected for area — should area be log-transformed?

I am doing a study to compare plant species richness (total number of species per site) to a bunch of environmental factors of sites at which these plants were surveyed. Because these sites are ...
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It is correct to construct tree species-based rarefaction curves for birds?

If I register all the species of birds that uses sp1 tree, then, all the species of birds that use sp2 tree, and so on. With this dataset, I can made a rarefaction curve using "number of tree species" ...
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How should you choose from the various methods of constrained ordination?

I have a bacterial OTU matrix from various sample points and times. So for each sample I have the sequence counts across the various OTUs that they were assigned to. I also have a corresponding ...
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2answers
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What is the best way to calculate the biological diversity of samples from bacterial/viral OTU tables?

I have a few large OTU tables of bacterial and viral datasets. The samples are across different sites and times. I would like to visualise the community 'diversity' across the times for which I have ...
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Should you perform an ordination (such as PCA) of abiotic variables before a Redundancy analysis (RDA)?

I have a dataset of viral 'OTUs' across various sample points from different sites/times. I also have meta-data collected at these same sample points, for things like temperature and the ...
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At what temporal scales do forest structures change?

At which time scales do forest stand characteristics (i.e. stand density, species composition, & diameter distributions) change in a temperate European forest which is not managed? Ideally, I'd ...
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376 views

How do communities relate to food webs?

I am a biology student who has just completed drawing a food web for class. As I was making it, I learned that a food web is the sum of all feeding interactions. My teacher associated food webs with ...
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A question about a succession study by Chapin et al. (1994)

The succession study in Glacier Bay, Alaska (Chapin et al., 1994) is an example that is used in almost all introductory texts on ecological succession. In the study, the effect of each succession ...
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Terrarium Compatibility: Millipedes with Carnivorous Plants?

I have a child that loves his large millipedes (Desert Millipedes) and Venus Fly Traps. He's also been wanting to get some Sundew Savages. Given this little collection and his real enjoyment of ...
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223 views

How to use Transect-based sampling to select sample trees [closed]

I was wondering if you help me how to use Transect-based sampling to select sample trees
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Relation between biomass and radius of roots system

Is there a known relation between the mass of a plant to the size of its roots? For example, can I take the root size to be proportional to the biomass of the plant like in this relation: $$R = R_0 (...
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What does a climax community lead to?

Seral communities modify the environmental conditions in such a way that these are less favourable for itself and more favourable for the next community. Each community acts to end itself. If the ...
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2answers
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Biological meaning of Lotka-Volterra Jacobian matrices

In a book about community ecology, I learned about Lotka-Volterra models and dynamic food web models (I am not an ecologist in the first place). In one of the chapters, a Jacobian matrix of partial ...
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1answer
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Distance to source populations and/or environmental gradients?

How do you disentangle the effects of distance to source populations and environmental gradients when the environmental gradient occurs in the same direction as the source population? For example, ...
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437 views

How can I calculate Shannon-Wiener diversity index in caves with different kind of habitats and different sampling methods?

I would like to start a monitoring in different caves, compare caves of different age and length, and find out if there are any correlations between these factors and their diversity. I was thinking ...
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Is “aggregate percentage” still a valid term in ecology?

Martin et al. 1946 define "aggregate percentage" as a metric that describes the mean percentage contribution of a group to the total mass/abundance of all samples. The metric is useful in datasets ...
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290 views

Are there any theories using thermodynamics/statistical mechanics or information theory principles to modelling in ecology?

So far, I've only known one: the MaxEnt theory. It uses the maximum information entropy developed by information theorist, which in turn inspired by the thermodynamics from physics, to predict the ...
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Can I compare Shannon-Wiener diversity indices between plots of different sizes (area)?

Can I compare the Shannon-Wiener (a.k.a. Shannon-Weaver) Index of diversity ($H'$) of plots (communities) with varying sizes (areas)? If not, what steps do I need to take and/or which tests should ...
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63 views

Blomberg's K and branch length

Do different values of the smoothing parameter lambda for estimating the divergence times (in situ Sanderson 2002) will affect trait conservatism (e.g., Blomberg's K)?
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196 views

Recent classification for parasitoid (ecological relationships)

I'm about to present an exam about ecological interactions in biological control. Although the position of some groups is clear, in the case of parasitoids they are included sometimes as predators, ...
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1answer
51 views

Literature that demonstrates organisms have a competitive advantage in numbers

I'm studying two bird populations that are competing against each other for a resource: Population A and Population B. Population A is present in much higher numbers than Population B, and as a ...
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2answers
257 views

Why do pine stands exist?

I live in the midwestern United States. I cycle to work, sometimes on heavily wooded roads, and I can't help but notice that in most places within the surrounding deciduous forests Pine and evergreen ...
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Null distribution of Blomberg's K

I've noticed different functions in different R libraries have different ways of assessing significance for Blomberg's K. For instance, picante's phylosignal looks at a distribution of PIC variance ...
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Definition of “Niche Complementarity”

What does "Niche Complementarity" mean? On this website they define "Niche Complementarity" as: The tendency for coexisting species which occupy a similar position along one niche dimension I don'...
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406 views

Standardized Selection Ratio (SSR)

In this article the athors used the Standardized Selection Ratio (SSR) in order to infer what is the preferred host (anemone) of anemonefish. Here is a quotation coming from their methods: ...
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Index of ecological niche overlap

What is the Pianka's Index? How does it work? How can one calculate this index? How often is it used? In what context do people usually use it? Can one infer any statistical significance with this ...
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1answer
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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 ...
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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 ...