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Questions tagged [biodiversity]

The range of differences and relationships between living organisms, especially at the ecological level.

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Measure of diversity, accounting for known species

I'm interested in measuring the diversity of each sample out of many independent samples. I know a priori all possible species that could appear in a sample, and expect the counts of species to be ...
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1answer
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Time taken for species to become endemic [closed]

Is it known how long species take to become endemic? I know from examples such as Canada which have no endemics following the end of glaciation that the process must take at least 10 thousand years, ...
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Is there a biological explanation for a 0.5 difference in allele size with PCR product?

CONTEXT I am currently working on a set of diversity, this diversity in interspecific (within the same genus). I am using SSR markers, the primers were designed on one species and are working really ...
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Is my heritability implementation for an asexual population wrong?

I have written a program intending to test a couple of evolutionary strategies and I have calculated heritability for the population (asexual) based on the values recorded during the simulation itself....
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1answer
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Using proportion or a diversity index when dealing with just two strains

I'm looking at diversity maintenance in an experimental system consisting of just two strains. I have count data. I can calculate their proportions and I can use that data in my statistical models, or ...
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Why do we value species that are on the brink of extinction? [closed]

As I understand, biodiversity has two benefits: Species might be a functional part of the ecosystem, e.g. balancing other species' numbers or beeing part of the foodchain. Species with diverse ...
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1answer
102 views

What's the best way to measure biodiversity? [closed]

As I understand it there are various ways biodiversity is measured, with varying results. From what I have been told on these boards, part of the difficulty is because it's hard to define a species ...
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1answer
22 views

Is there a chemical that can be used to subdue ants only temporarily without permanent harm?

I would like to know as I want to contribute to a biodiversity project that wants to create a database with ant feature measurements. I'm not sure if I like the idea of killing ants however (even ...
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Why is there an apparent reduction of reptile species near the Mississippi River?

The USGS Gap Analysis Program published a map of reptile species richness in the U.S. There is a conspicuous reduction in reptile richness along the Mississippi River corridor. Why might this be? ...
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Why is there extreme itching when we touch a hairy caterpillar? What are ways to stop itching?

I mean there are lot of caterpillars or hairy caterpillars to be more precise when we touch those hairs we get extreme itching on that area i want to know why we got that itching? Ok i know that it ...
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Why are there so many species?

I was recently reading a science journal when I came across this article stating that there are more than 20,000 species of ants, 3,00,000 species of beetles, 28,000 species of fishes and nearly 20,...
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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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Forest Fires and Horsetails

In our school textbook, it is written that sometime forest fires can occur due to rubbing of two horsetails. In the image that I searched online, the plant itself looks thin and rod like with leaflike ...
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At what point in life's history was biodiversity at its greatest?

When considering plant & animal species throughout the entire Earth, at what point in life's history was biodiversity at its greatest? The aforementioned question stems from this article about ...
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1answer
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Estimation of species range fragmentation

While discussing species distribution patterns along spatial, temporal or functional gradients one often finds a hump shaped species richness pattern. This is well documented in many taxa and spatial ...
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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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1answer
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Bird diversity and the avian flu

From Learning from the Octopus 1 (p. 201): A complimentary line of defense would be to lower the chance of infection by lowering the prevalence and virulence of diseases…just keep the variability ...
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Is there a resource for comparing categories of life along quantifiable dimensions such as species diversity, geographic range, total mass, etc?

Ideally what I would like is some sort of interactive, sliceable tabular data along the lines of my examples below. The curious individual specifies the level of taxonomic rank, e.g. Kingdom or Class ...
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Are there any photosynthetic catalysts in use other than chlorophyll?

When I search for catalysts other than chlorophyll on Google, I only get references to artificial photosynthesis. When I look up photosynthesis, I see accessory pigments mentioned, but it appears that ...
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How close genetically is the most human-like chimpanzee to the most chimp-like human?

I understand that: Chimpanzees are the closest species to humans genetically. Only 1%-6% of their genes are different. Within any species there is genetic diversity, i.e. no two individuals have the ...
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3answers
265 views

Does leaving land alone actually help nature conservation?

I like nature conservation - the idea of creating protected areas where nature lives on its own and wilderness is "created" like that. Is is possible to raise the natural value of land only by leaving ...
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4answers
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How to introduce predators to a simulated ecosystem?

I made an evolution simulator and observed that when a marginally competent predator appears, it quickly multiplies and hunts down all of the prey animals, which leads to their own extinction soon ...
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1answer
608 views

Does the edge effect promote biodiversity?

I define the edge effect as: A term used to describe what occurs at habitat boundaries where two bordering communities influence one another. My question is whether it generally leads to an increase ...
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How important is dead wood to the ecology of a forest and how much dead wood should remain?

I have a local 'forest management group' in my area. One of the jobs they do is to thin out the forest by removing some of the trees. They then sell the wood for firewood. I want to tell them to ...
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1answer
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Measuring tumor heterogeneity [closed]

I would like to ask if there's any method (established or not) in order to quantify heterogeneity found in mutations occuring in primary neoplasms and metastatic lesions (either common or private) and ...
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1answer
663 views

Based on this diagram, how do you deduce the keystone species? [closed]

How would you figure out what the keystone species is in the following textbook question? (questions 1 and 2 at the bottom of the image) Based on my knowledge, a keystone species helps to maintain ...
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1answer
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Conservation Ex Situ

This came up in my biology diversity course and I wanted to raise a question about it. On the topic of ex situ, one of the presentations that a speaker mentioned that one of its disadvantages is ...
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1answer
363 views

How to compare diversity between different ecosystems?

I've used the Shannon Wiener Diversity Index for a single ecosystem (species as categorical variables). Do you know any alternative indices, especially ones that compare diversity between different ...
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Do eukaryotes assimilate DNA that is floating in the extracellular membrane?

Prokayotes, which replicate primarily using binary fission, don't get much genetic diversity. For this reason, they take in any genetic material they encounter, in a gambit to help them better adapt ...
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1answer
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Species-area relation graph

When species richness is plotted vs area, the graph follows the equation : log S = log C + Z log A where Z is the slope of the line. Z values are usually in the range of 0.1 to 0.2 but if very large ...
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2answers
657 views

Explaining the simpson's diversity index

In my biology class, we were trying to compare the biodiversity of two site. In doing so, we were instructed to use the Simpson's Diversity index as follows: $$ \frac{\sum_i n_i (n_i - 1)}{N (N - 1)}...
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1answer
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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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1answer
188 views

What would be the impact of depositing limestone in the oceans (to reverse acidification) on ocean life forms and biodiversity?

This question asked: What is the evidence it is feasible to reverse ocean acidification by adding large quantities of a base (bicarb soda)? The result was: Danny Harvey of the University of ...
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Database of Geographic Range of Species

Is there a database of organisms which would contain their queriable geographic location? I would need to perform a rather simple query, such as ...
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2answers
75 views

What ways are there to determine how big genera are?

I want to look at genera as a whole, across the animal kingdom to determine the range of sizes of genera. I have examined species richness and genetic diversity (pairwise distance from sequence data ...
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2answers
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Why aren't animals diverse in phenotype? [duplicate]

I am not comparing a cat with leopard. I am just saying that we humans are all one type of creature and we are diverse (I am not saying we are class of mammals and phylum of etc and kingdom etc, ...
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3answers
255 views

What problems do invasive species cause ? [closed]

Why do we value species? What is so bad about invasive species? Why value biodiversity?
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1answer
505 views

Molting in arthropods

Do all the arthropods molt ? Which ones do not molt ? Why don't they need to molt ? I tried googling this - but did not get satisfactory answers.
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Is there a hypothesis that attempts to explain patterns of species richness along all three energy-related environmental gradients?

My question is related to one of the oldest question in ecology: "What determines global patterns of species richness?". However, I want to focus on one particular part of this question, which has ...
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1answer
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How do you estimate global species richness?

I know how estimates of species richness in a small area are made. But how do you estimate the total number of species on a global scale? One example of such a method can be found in Mora et al. ...
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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 ...
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476 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 ...