Search found 29 matches

by marquitosgm
Mon Jun 25, 2012 10:48 am
Forum: Zoology Discussion
Topic: Bug ID help needed
Replies: 2
Views: 4755

Re: Bug ID help needed

Hi.
We have a similar one here in Europe.
It is a hummingbird Hawk-moth or Hummingmoth.
Looks like, flies as, and feeds the same way as a humming bird, but is a moth.
Cheers.
by marquitosgm
Fri Mar 30, 2012 10:11 am
Forum: Evolution
Topic: Evolution not supported by the facts
Replies: 8
Views: 5943

Re: Evolution not supported by the facts

have you read this one?

On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life? By Ch. Darwin (1859)

Pure beauty.
by marquitosgm
Fri Mar 30, 2012 8:05 am
Forum: Ecology
Topic: Herbivores without predators
Replies: 19
Views: 26937

Re: Herbivores without predators

Yes, true. Bottleneck effect, associated genetic drift and inbreeding depression are all well theorised to reduce genetic variation, thus harming populations' ability to whithstand environmental changes. Increased riskof extinction results. But back in my years as a conservation biologist I remember...
by marquitosgm
Fri Mar 30, 2012 7:16 am
Forum: Human Biology
Topic: Albinism
Replies: 2
Views: 3644

Re: Albinism

Albinism is not a disorder. It is just infrequent. Albino people enjoy good health, are fully competent and have the same potential for happiness as others. They have poorer natural protection against harmful sun radiation, yes, but compensating for this does not require major departures from a norm...
by marquitosgm
Thu Mar 29, 2012 9:18 pm
Forum: Ecology
Topic: Herbivores without predators
Replies: 19
Views: 26937

Re:

JorgeLobo wrote:reference please


Yes, please. We all have heard a lot about endogamic depression theory. But over the years I have only come across one single study showing it happening in wild populations. I remember it was a paper on european vipers published by late nineties, that's all I can remember.
by marquitosgm
Thu Mar 29, 2012 9:11 pm
Forum: Ecology
Topic: Herbivores without predators
Replies: 19
Views: 26937

Re: Herbivores without predators

Forget about genetics, ecology alone gives big enough an issue. You need to consider: 1) Is your system closed or open? If closed -say an island or a fenced property- herbivores can't migrate into or out of the system. They will eat all edible plants and start dying of starvation as food becomes sca...
by marquitosgm
Thu Mar 29, 2012 7:12 pm
Forum: Zoology Discussion
Topic: Green mammals
Replies: 12
Views: 29876

Re: Green mammals

Sorry, I could'n get this issue out of my mind.

I sought what others have wrote about it and came across this:

http://www.hhmi.org/askascientist/answe ... 5-195.html

Highly interesting

Cheers
by marquitosgm
Thu Mar 29, 2012 10:40 am
Forum: Zoology Discussion
Topic: Maximum Life Span of Animals, Fishes and Birds.
Replies: 9
Views: 13976

Shortly:

I remember to have read about what JackBean says in the first reply here:

http://www.amazon.com/Ecological-Implic ... 052128886X

A must for zoologists, online in google:

http://books.google.es/books?id=OYVxiZg ... ze&f=false

Cheers
by marquitosgm
Thu Mar 29, 2012 10:31 am
Forum: Zoology Discussion
Topic: Mean corpuscular volume differences
Replies: 1
Views: 2978

Re: Mean corpuscular volume differences

Interesting Whithout the time to graph data, check taxonomy and make statistics my first gess is: 1) Deep divers such as dolphins, whales and seals have high MCV. This may well be related to the need to store oxigen when diving. However some kind of balance must exist between cell size and number of...
by marquitosgm
Thu Mar 29, 2012 10:12 am
Forum: Zoology Discussion
Topic: Green mammals
Replies: 12
Views: 29876

Re: Green mammals

Yes, evolution usually works in simple ways, but understanting them is often a complex task. I didn't think much to write the "green is useless for mammals" theory, just tried to be original in order to set scientific method to work. In my opinion we have not added enough evidence in this ...
by marquitosgm
Tue Mar 27, 2012 11:35 am
Forum: Cell Biology
Topic: Path of an electron through the electron transport chain
Replies: 1
Views: 4342

It's simple. The journey starts when NADH (or FADH2) delivers two electrons to the transport chain. The cahin is in fact made of a number of proteins in the inner mitochondrial membrane (or bacterium membrane) including citochrome. Thake a look at m for details. The last member of the ETC gives the ...
by marquitosgm
Tue Mar 27, 2012 11:27 am
Forum: Cell Biology
Topic: Anaphase in cells
Replies: 6
Views: 6724

I usually tell to my students you can easily recognize anaphasic chromosomes because they " tienen cara de velocidad" (are speed faced).