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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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How to correctly assess the impact of invasive species on a community using the diversity index?

How can the impact of invasive species on a community be correctly assessed using the diversity index if the abundance of the target species, i.e. the invasive species, is not used to calculate the ...
benjamin jarcuska's user avatar
0 votes
1 answer
37 views

Overly stabilised population dynamics model

My project aims to model population dynamics of a 3 trophic levels system: primary producers, herbivores and predator. I try to predict how changes in the vegetation abundance might affect higher ...
Rachel's user avatar
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1 vote
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How should I analyze proportional community data, in respect to habitat variables?

I want to analyze how the proportions of groups of species in a biological community correlated to habitat variables. I have 6 functional groups, defined by their similar traits, and I want to know ...
Jaxson Priest's user avatar
1 vote
1 answer
88 views

How selective are wolves about the size of their prey?

For an animal that lives and hunts socially like a wolf, is there a lower threshold to the size of prey items they will hunt? A pack wouldn't have much trouble with catching say a rabbit, but would ...
pbuchheit's user avatar
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How do I construct sample-based rarefaction curves if the area (or volume) sampled is not consistent between samples?

My apologies if a similar question has been asked previously but I cannot find an answer. I have data from multiple zooplankton tows from different study sites and I am trying to construct sample-...
planktonQ's user avatar
3 votes
1 answer
214 views

Ecology: Indices to calculate species overlap in a community?

Experimental design: I sampled the abundances of four species for each month of the year. I did this across 6 sites. I want to calculate the temporal niche overlap for all the species at each site. ...
verbose's user avatar
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0 answers
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Has anyone seen/read interspecies competition that is different at spatial scale for the same group of animals?

I work at a highly fragmented wildlife sanctuary in North Borneo, Malaysia. We have 8 species of hornbills here and from our observation they've grown to be less territorial in terms of where they ...
Ashraft Yusni's user avatar
1 vote
1 answer
608 views

does more biomass mean more energy?

I am a high school student and I am very confused about ecological pyramids. My textbook states that the biomass of zooplankton in an aquatic ecosystem is more than that of phytoplankton (I don't know ...
Arun Bhardwaj's user avatar
2 votes
0 answers
85 views

Extrapolating rarefaction curves

I am interested in methods for extrapolating rarefaction curves and/or estimating the true species richness. The ecosystem of interest is the gut microbiome and extrapolation is to higher sequencing. ...
Roger V.'s user avatar
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3 votes
0 answers
78 views

Apportionment models, niche theory, neutral theory

I am trying to understand the relation between apportionment models, niche theory, and neutral theory of biodiversity. Wikipedia seems to suggest that the first two are the same thing, whereas the ...
Roger V.'s user avatar
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-1 votes
1 answer
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Animal body size determination for abundance

Does an animal being small or large determine its abundance?
Chikodili's user avatar
0 votes
1 answer
964 views

How is the carrying capacity of a logistic growth model calculated?

I am reading a book in epidemiology where the carrying capacity for a standard logistic growth rate is given by K = (b - delta) / gamma where: ...
Gigiux's user avatar
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Are there solitary animals communicating with themselves?

I can imagine 3 different kinds of communication between individuals: Communication between individuals of the same species. Communication between an individual and another from a different species. ...
Nicolas Malebranche's user avatar
5 votes
1 answer
3k views

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 ...
米凯乐's user avatar
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0 answers
603 views

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 ...
Alice Hobbs's user avatar
3 votes
2 answers
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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 ...
Mithical's user avatar
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1 answer
81 views

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?
mschroth's user avatar
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4 votes
0 answers
179 views

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 ...
JohnWDailey's user avatar
3 votes
2 answers
99 views

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 ...
Circus pygargus's user avatar
3 votes
1 answer
100 views

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 ...
Mil's user avatar
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12 votes
1 answer
528 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 ...
tparker's user avatar
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5 votes
1 answer
167 views

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 ...
Caam's user avatar
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3 votes
2 answers
172 views

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 ...
StarlightDown's user avatar
-1 votes
1 answer
1k 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 ...
Lili's user avatar
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9 votes
1 answer
400 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 ...
Kayleigh Nielson's user avatar
1 vote
0 answers
48 views

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" ...
Emanuel's user avatar
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2 votes
1 answer
61 views

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 ...
Frodo Baggings's user avatar
4 votes
2 answers
373 views

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 ...
Frodo Baggings's user avatar
3 votes
0 answers
94 views

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 ...
Frodo Baggings's user avatar
9 votes
1 answer
176 views

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 ...
erc's user avatar
  • 93
5 votes
2 answers
774 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 ...
Tim Eterno's user avatar
2 votes
0 answers
102 views

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 ...
quibble's user avatar
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3 votes
0 answers
315 views

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 ...
ylluminate's user avatar
0 votes
1 answer
339 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
Nunu's user avatar
  • 1
-2 votes
1 answer
2k views

what does 'invoking the ghost of competition past" mean? Why is it important for present research on interspecific competition? [closed]

Ecological and evolutionairy effects are sometimes difficult to distinguish.
Barry_de_wrat's user avatar
4 votes
1 answer
154 views

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 (...
Ohm's user avatar
  • 151
1 vote
1 answer
2k views

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 ...
sreekara's user avatar
  • 769
3 votes
2 answers
653 views

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 ...
KermittDuss's user avatar
2 votes
1 answer
113 views

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, ...
Sean's user avatar
  • 21
4 votes
1 answer
513 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 ...
Joseph's user avatar
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5 votes
1 answer
115 views

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 ...
Mikko's user avatar
  • 272
5 votes
2 answers
565 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 ...
Ooker's user avatar
  • 578
8 votes
1 answer
2k views

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 ...
theforestecologist's user avatar
0 votes
1 answer
104 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)?
user1301593's user avatar
8 votes
1 answer
225 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, ...
user12257's user avatar
0 votes
1 answer
82 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 ...
luciano's user avatar
  • 599
4 votes
2 answers
449 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 ...
user1833028's user avatar
5 votes
1 answer
937 views

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 ...
user1301593's user avatar
3 votes
3 answers
10k views

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'...
Remi.b's user avatar
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1 vote
1 answer
489 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: ...
Remi.b's user avatar
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