Questions tagged [biodiversity]

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

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How many different species have existed on Earth?

NOTE: Someone else asked this same question a few years back, but it was incorrectly marked as a duplicate and so the question may not have been answered satisfactorily. I'm asking it again, in hopes ...
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What effect would glaciation have on biodervisity?

If the holocene ended, and there was another glaciation, what would happen to wildlife and flora globally ?
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How can I calculate Fst, Gst, and Nei diversity index?

I got different polymorphisms of Cucumber mosaic virus in different regions of its genome from different libraries of RNAseq. This virus have two coding regions which are 3A and CP regions. I have ...
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Which plant's part is this?

I found this plant in Rajasthan, India. This sample is 4-5 cm long. This is an ornamental plant. It was a potted plant. I put my fingertip in the photo to give an idea of size of the specimen. I can't ...
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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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Inequality factor for similarity sensitive diversity

In a research article, Lou Jost has introduced the concept of inequality factor. The paper is "The relation between evenness and diversity", published in 2010. Inequality factor allows an intuitive ...
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Were there any terrestrial species in the ancestry of all crustaceans?

To the exception of woodlice, Crustaceans live in aquatic (marine or freshwater) environments. Crustaceans are arthropods which is an immensely diverse taxon. Many arthropods live in terrestrial ...
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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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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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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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225 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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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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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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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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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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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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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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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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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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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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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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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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413 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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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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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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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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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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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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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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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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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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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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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 ...