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Questions tagged [life-history]

The timing of key events in an organism's lifetime, including development, reproduction and death.

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1answer
30 views

What is an accessible book about plant evolution for a non-biologist? [closed]

I have an acquaintance interested in learning about the evolution history of plants. This person has a wide knowledge on botanics, from personal reading and taking care of plants, but E is neither a ...
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0answers
34 views

What flora existed during the last ice age, before the Anthropocene epoch?

Somehow there isn't a single source on the internet that can simply answer a decent amount of what species or even genus of flora existed during the ice age. Obviously only an advanced computer ...
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1answer
1k views

What animal has the longest juvenile period?

I just heard the following complaint from a comedienne. Humans are the only animal that is completely useless for the first twenty five years of life. Obviously this is just a joke but it is true ...
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2answers
2k views

Was iron important for the first life on Earth?

Some ions or compounds are thought not to have become involved or important in the metabolism of living organisms until some time after certain mutations took place. For instance, early life is ...
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1answer
191 views

How to find the age of a memory stored in the brain?

Is there any way to find how old one's memory is? One can find the age of stones, plants, animals, etc. So why not find the age of a memory stored inside one's brain?
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0answers
20 views

Is there a authority , full scale and detailed document or database about creature taxonmy? [duplicate]

I am a fan and starter in biology. I want to know more about different creatures. Is there an official website that introduces all or a majority of creatures in the world? For example: a famous ...
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0answers
14 views

Does imprinting occur at different life stages?

For example, consider the offspring of a bird species. Can offspring get imprinted by other individuals of the same population at various life stages (e.g., hatchling, nestling, fledgeling, juvenile)? ...
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2answers
363 views

Is a microspore diploid?

In gymnosperms the plant body is predominantly sporophytic. It produces microspores or megaspores my textbook says that these undergo reduction division in order to form male gametophytes pollen ...
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0answers
33 views

Can we estimate longevity from menopause age?

This is from an answer in other question, about the age at which menopause occurs: Aristotle's assessment was similar to those of Hippocrates and also Roman authors, so it seems that 2000 years ...
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1answer
104 views

How have single-celled organisms learned to survive?

Upfront: I am a computer science student trying to understand evolution and its implications. I've been pondering the concepts of evolution for some time, especially related to neuroscience / how ...
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1answer
578 views

Life cycle of proteins

I try to get a picture of the life cycle of a protein (considered as a specific molecule). This is how I can imagine it: After the cell is born a protein molecule is synthesized by gene expression ...
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0answers
37 views

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
173 views

Wasn't extinction of dinosaurs necessary? [closed]

Beginning from the triassic era, dinosaurs crawled for millions of years. So my basic idea is, that had the dinosaurs not been wiped out, they would have eaten all the flora on the planet then. ...
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1answer
3k views

How long before robin no longer needs the nest on my porch?

A robin has made a nest on my porch. Unfortunately, the nest is on my weed wacker which I might want to use at some point this summer. Currently, there are two eggs in the nest. How long will it be ...
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2answers
453 views

Why would a human female have a sexual display despite male biased operational sex ratio? [closed]

why would a human female have a sexual display despite male-biased operational sex ratio? In human society there is a male-biased sex ratio, due to female child rearing, which results from anisogamy. ...
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0answers
32 views

How, when, and where did the very first life in the universe exist/formed [closed]

Do we know about the very first life, how it is formed? or from where it originated in the universe? How life is fromed in our planet earth?? Life require conditions for survival or it can create ...
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0answers
38 views

Infant Death Adjusted Historical Human Lifespan

I had found a good paper at one point to describe this but I can't seem to locate something similar now. I am looking for a manuscript that describes average human lifespans throughout history/...
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0answers
129 views

To what extent do fossils change over time?

Fossils are formed over millions of years. How do scientists quantify the extent to which a particular fossil has changed in shape/relative tissue density/etc. over geological timescales (if at all)? ...
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3answers
348 views

Real-world examples of Darwinian extinction

Darwinian extinction (also known as "evolutionary suicide") refers to processes of selection-driven self-extinction, i.e. the cases where natural selection causes the extinction of an evolving ...
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0answers
102 views

Why does female's age of puberty inform on mating system?

Reading from Does increased calorie intake cause increase in libido in humans?, @AlexStone says: I'm aware that humans have a dual mating strategy - somewhere between pair bond and casual mating. ...
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1answer
131 views

When did death due to aging first appear? [duplicate]

As I understand it, single-celled organisms that reproduce via mitosis essentially live forever. When a cell divides, one cannot say that either one of the new cells "is" the parent and the other the ...
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2answers
5k views

Why do pink rain lilies flower only after rains, and not from being watered?

We have pink rain lilies (Zephyranthes carinata) in the garden. In my personal experience, I've found that they always flower, without exception, shortly after rains. However, there are roughly ten ...
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0answers
170 views

Does reproduction cause aging ? Is aging just a strategy to increase reproductive success in all organisms? [closed]

Background for why I am asking this: I read a book—modern biological theory and experiments on celibacy— which uses life history theory to imply that reproduction is the reason why organisms grow old....
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1answer
612 views

What makes animal to continually reproduce? [closed]

I was reading about Trypophobia and reached to Surinam Toad's reproduction methods. Then I had this doubt- Why would animals want to reproduce so much? In case of humans we mostly have the offsprings ...
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0answers
33 views

How do furniture beetle larvae drink?

I have read that the furniture beetle (Anobium punctatum) has larva that will burrow for three to four years in wood before emerging and pupating. How do they obtain water during that time if they are ...
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0answers
91 views

Why do people die? [duplicate]

what is the reason people die naturally even though they have no known disease? I see people become physically weak at times they get old and die eventually in case they are not attacked by any known ...
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3answers
897 views

Do any amphibians start their lives on land?

Most amphibians - at least, all the ones I know of - start their lives in the water (at least, after they hatch). They then spend time maturing before venturing onto land, where they can breed. The ...
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2answers
666 views

How to gather life-history traits data on bird species?

I am looking for a data base of life history traits for bird species. Is there such data base? If not, what are your advice on how to collect those data? Is there a handy website that list ...
2
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1answer
130 views

Do Blanding's Turtles die of old age?

I have recently found articles and various claims that turtles (Blanding's turtles as an exact example) could possibly live indefinitely. http://discovermagazine.com/2002/jun/featturtle This is said ...
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1answer
731 views

Any examples of an organism's life cycle where the reproductive stage occur before the 'adult' stage?

Most life cycles we knew of consist of a juvenile stage (e.g. larval for insects, sporozoite for some intracellular parasites), a reproductive stage and an adult stage. Usually the reproductive stage ...
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2answers
1k views

Could we slow down life? [closed]

As far as I know there is no absolute time measurement (one that would measure time in a non-environment-dependent fashion) in any life form. Only such time measurements exist, which are dependent ...
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4answers
1k views

Why are the fertility rates of large predators kept low?

Predators at the top of a food chain, like lions, seem to have a relatively low fertility rate, which fits well to the ecosystem and avoids overpredation. But what is the mechanism that keeps the ...
4
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1answer
615 views

What fish (and/or shellfish) species with a multi-year life-cycle, besides salmon, die after spawning?

Most species of salmon die after spawning. Are there any other types of fish that spawn once and then die after a multi-year life-cylce? Is this a rare life history strategy among our human exploited ...
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2answers
971 views

What determines the autumn leaf color?

It is autumn out there. Green, brown, red, yellow, and mixed-colored leaves drop from the trees to the ground. What determines the colors of the leaves? Wikipedia tells me Leaf senescence is the ...
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1answer
401 views

Evolutionary support for parenting book “The happiest baby on the block”

The book by Dr Harvey Karp (MD) The Happiest Baby on the Block proposes that the duration of human gestation has evolved as a tradeoff between cranial size and development of the infant. He ...
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1answer
15k views

Do bacteria die of old age?

I know that the cells of mammals at least stop dividing when they are old, and then die a programmed cell death. Then other cells have to replace them. But in a bacterial colony, each cell ...
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2answers
3k views

In practice, do fishes die from old age?

I was watching sea birds eating fishes and wondered if fishes actually died from old age, or if they are all eaten before this can happen? I reckon some big predator fishes must be able to live long ...
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1answer
67 views

About validation process of phenological study

I have recently done a phenological study using remote sensing techniques. Now I need to validate my results and my methods, that is, to determine if the phenology estimated from remote sensing is ...
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1answer
3k views

Regulation in plants bearing cleistogamous and chasmogamous flowers

In most plants bearing cleistogamous flowers, chasmogamous flowers are also borne by the plants. For example, Viola, Oxalis and Commelina contain both these kinds of flowers.( I am unaware of a ...
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1answer
63 views

Are there cannibalistic k-selectors?

My understanding of r- and k-selectors does not go deeper than the wikipedia article. I understand k-selectors to be creatures that put tendentially more effort and energy into rearing their offspring,...
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1answer
164 views

Is there already discovered non-carbon form of life?

I have heard of some rumors going around about a living organism based on non-carbon. Is Has research been done with real form of life based on non-carbon? Or carbon-based life is only type of life ...
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1answer
100 views

Why might you NOT observe a tradeoff between two life-history traits?

I have traditionally thought of and heard about life-history traits (e.g., size at first reproduction, number of offspring, size of offspring, survival, etc., etc.) as drawing from a finite pool of ...
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2answers
258 views

Is the missing “life-ingredient” in today's Earth's existence the reason why we cannot recreate life?

As far as I know, there was no report of "life" popping up in a lab or in nature so far. Everything that we know is only some copy with similarity to previous life-forms. We certainly can mix some ...
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1answer
194 views

Hibernation, Metabolism and Aging

People are beginning to seriously research space travel applications of therapeutic hypothermia, specifically for reducing metabolism and stress on humans traveling to Mars. It seems that as you ...
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1answer
792 views

What biological processes cause leaves to change colours in Autumn?

I am curious to learn what are the biological mechanisms that cause leaves of deciduous plants to change colour? What happens to the chlorophyll? What environmental phenomena (temperature/air ...
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2answers
197 views

Is there theory that connects longevity, time-scale of environmental disturbance, and adaptation?

I'm thinking here about environmental disturbance or like climate change-driven warming. It seems as if there are two macroevolutionary ways to deal with environmental change: 1) Have short ...
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2answers
1k views

Is life expectancy linked to intelligence in animals?

For example, animals that live only a few days or a few years are often not very intelligent. In contrast, the most intelligent animals seem to live longer. Is this true? Are there any studies to ...
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1answer
808 views

How do animals/plants change for each season? [closed]

The question pretty much sums it up. How do animals/plants change for each: Spring, Summer, Autumn, and Winter? A detailed explanation on distinct behaviour and appearance changes would be nice.
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0answers
410 views

Is there a standard definition for plant “maturity”?

Is there a species-agnostic metric for identifying plant maturity? There seems to be plenty of literature defining life-history stages for specific crops, but it is not clear if there is a generic ...
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1answer
138 views

What controls leaf senescence in deciduous tree species, and how can I predict it?

If I want to predict litterfall, what data do I need to collect, and what statistical model might I use? For example, I might use the following coding to record phenological stage every other day, or ...