Skip to content

SANParks.org Forums

View unanswered posts | View active topics






Post new topic Reply to topic  Page 46 of 64
 [ 958 posts ]  Go to page Previous  1 ... 43, 44, 45, 46, 47, 48, 49 ... 64  Next
Author Message
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sat Nov 13, 2010 10:01 am 
Offline
Virtual Ranger
Virtual Ranger
User avatar

Joined: Wed Jan 02, 2008 4:57 pm
Posts: 3183
Location: Randburg, SA
:whistle:

_________________
The beginning of knowledge is the discovery of something we do not understand.

"We are what we repeatedly do. Excellence, then, is not an act, but a habit." Aristotle


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sun Nov 14, 2010 6:55 am 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Mar 08, 2009 9:37 pm
Posts: 7460
Location: Daar waar die bobbejane hul borshare kam
Organisms such as tuna fish, skunk cabbages, butterflies, honey bees, crocuses, and others regularly warm their bodies to an appreciable extent through the use of metabolic heat.

In the case of insects - they 'shiver' to warm their wing muscles - shivering thermogenesis.

_________________
“Life is too short to wake up with regrets. So love the people who treat you right. Forget about those who don’t.” - Harvey MacKay


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sun Nov 14, 2010 7:05 am 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Mar 08, 2009 9:37 pm
Posts: 7460
Location: Daar waar die bobbejane hul borshare kam
Behavioral adaptations allow endothermic animals to exert some control over a given parameter - this is needed as they exceed certain activity levels that result in inevitable heating or when inactive, cooling.

In short it is called the energetics of locomotion in endothermic insects.

http://books.google.co.za/books?id=i9IT ... nd%20how&f


Ods, great Q! :clap: :clap: I am posting a page referring to this, but I'm not completely on par with your question (yet)! Stop studying, you are getting too clever. :lol: :twisted: :naughty: :rtm: :huh: :tongue:

_________________
“Life is too short to wake up with regrets. So love the people who treat you right. Forget about those who don’t.” - Harvey MacKay


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sun Nov 14, 2010 7:14 am 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Mar 08, 2009 9:37 pm
Posts: 7460
Location: Daar waar die bobbejane hul borshare kam
How?

* the sun - if cold
* shade - if hot
* micro habitat selection - on the ground, away from the ground
* vertical migration - away or towards ground
* stilting - if cold, close to the ground, if hot, away from the ground


High surface-to-volume ratio, it seems is why they can accomplish this phenomenon.


http://books.google.co.za/books?id=NHYu ... ns&f=false

_________________
“Life is too short to wake up with regrets. So love the people who treat you right. Forget about those who don’t.” - Harvey MacKay


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sun Nov 14, 2010 5:03 pm 
Offline
Virtual Ranger
Virtual Ranger
User avatar

Joined: Wed Jan 02, 2008 4:57 pm
Posts: 3183
Location: Randburg, SA
:lol: :lol: Thanks E :thumbs_up: :thumbs_up:

You definitely got the first part of the question right because they do become endothermic when they fly and rapidly increase their muscle activity to generate the heat. Sometimes ecophysiologists make it very confusing to understand thermal biology and i saw in your link they used some of the terms. When you talk about endothermy or ectothermy you need to think about the source of the body heat. So endotherms generate heat through internal metabolic activity while besides maintaining a standard metabolic rate necessary for maintaining cellular integrity ectothermic animals rely on external sources of heat and for them behavioural thermoregulation is very important like you explained.

But then there are also poikilotherms and homeotherms and most often endotherms are homeothermic and ectotherms are poikilothermic but not always. Those terms refer to the regulation of the body temperature so homeotherms maintain a constant body temperature (Tb) while the Tb of poikilotherms varies alot. So this moth could be described as all 4 things at different times! :wall:

The high surface area to volume ratio is also very important. Here small animals like insects have much higher surface area to volume ratio (meaning they have a small internal volume in comparison to external surface area, while larger animals have a small volume in comparison to a large surface area) which means that they can loose heat and heat up more effectively.

So for the second part of the question about why these moths can act as endotherms even if they are so much smaller than the physiological minimum for mammals has got to do with what drives metabolism. The metabolism is driven by oxygen and is not usually a limiting factor except in extreme situations like this. So mammals breathe using their lungs and oxygen diffuses across the lung surface into the blood and is then used to power the metabolism and this diffusion takes a while and can be effected by many things such as partial pressure and the relative concentration of carbon dioxide and oxygen between the blood and in the lungs. The insects on the other hand have a respiratory system composed of spiracles which allow oxygen to effectively be in direct contact with the cells and therefore their physiological system can maintain endothermic activity despite their significantly smaller size.

Sorry for the long winded answer :wall: :redface:

E, you were very close so your IT! :thumbs_up: :thumbs_up: :clap: :clap: :thumbs_up: :thumbs_up: :clap: :clap:

_________________
The beginning of knowledge is the discovery of something we do not understand.

"We are what we repeatedly do. Excellence, then, is not an act, but a habit." Aristotle


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sun Nov 14, 2010 11:56 pm 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Mar 08, 2009 9:37 pm
Posts: 7460
Location: Daar waar die bobbejane hul borshare kam
:shock: :big_eyes: Ods, did you swallow an atlas. :lol: :lol: :lol: Jokes aside, I had to study up on some of the terms you have used. (I don't think I deserve to be IT, btw).


Long winded? Apologies. No, not at all. Very nicely explained. Very interesting info coming through! I saw the Tb whilst conducting research earlier, but I thought they were referring to a lung disease. :lol: :lol:


Animals (and insects) are unique and perfectly created. :clap: :clap: :dance: :dance: Thanks for the new insight. :thumbs_up: :thumbs_up:

_________________
“Life is too short to wake up with regrets. So love the people who treat you right. Forget about those who don’t.” - Harvey MacKay


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Tue Nov 16, 2010 11:04 am 
Offline
Virtual Ranger
Virtual Ranger
User avatar

Joined: Wed Feb 25, 2009 9:38 pm
Posts: 5206
Location: Johannesburg
Award: Avatar of the Year (2012)
Thanks Odds, really interesting! :thumbs_up:

_________________
He is rich or poor according to what he is, not according to what he has. ~Henry Ward Beecher


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Thu Nov 18, 2010 10:36 pm 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Mar 08, 2009 9:37 pm
Posts: 7460
Location: Daar waar die bobbejane hul borshare kam
We were mistaken for the young of praying mantises
# 13 was not our unlucky number
Our eggs are awakened by autumn rains
We like cold and wet conditions
To study us, scientists explored the structure of our genitalia.

What are we and tell me a bit more.

_________________
“Life is too short to wake up with regrets. So love the people who treat you right. Forget about those who don’t.” - Harvey MacKay


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sun Dec 12, 2010 11:37 pm 
Offline
Distinguished Virtual Ranger
Distinguished Virtual Ranger
User avatar

Joined: Wed Aug 31, 2005 12:28 am
Posts: 14137
Location: Pretoria, RSA
Heel walkers.

_________________
Imberbe = Combretum imberbe = Leadwood = Hardekool = The spirit of the Wildernis!

Want to know more about the SANParks Honorary Rangers? Visit www.sanparkshr.org


One positive deed is worth more than a thousand critical words.


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Thu Jan 20, 2011 10:17 pm 
Offline
Distinguished Virtual Ranger
Distinguished Virtual Ranger
User avatar

Joined: Wed Aug 31, 2005 12:28 am
Posts: 14137
Location: Pretoria, RSA
Explain how a male bed bug can impregnate a female bed bug without ever coming in to direct contact with her.

_________________
Imberbe = Combretum imberbe = Leadwood = Hardekool = The spirit of the Wildernis!

Want to know more about the SANParks Honorary Rangers? Visit www.sanparkshr.org


One positive deed is worth more than a thousand critical words.


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Fri Jan 21, 2011 5:14 am 
Offline
Distinguished Virtual Ranger
Distinguished Virtual Ranger
User avatar
Award: Quiz Whiz of the Year (2013)
Joined: Tue Dec 23, 2008 5:22 am
Posts: 20150
Location: Midway between the infinite and the infinitesimal!
Award: Musketeer of the Year, Quiz Whiz of the Year (2012)
:hmz: Doesn't sound too exciting a life, though. :lol:

_________________
EVERYBODY'S TR!
TR: A NEW DAY IS S-OWN
TR: NECTAREAN NICETIES OF THE NORTH
TR: PRIMEVAL PLEASURE

"Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read." (Groucho Marx)


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Fri Jan 21, 2011 7:59 am 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Thu Nov 06, 2008 4:45 pm
Posts: 5598
Location: Pretoria
Bad things, these rapists and sodomisers.

_________________
Marius
Hunter, nature lover, conservationist.

I believe that for man to survive, we must work with nature rather than against her. We need the land; the land doesn't need us. Too many people have lost sight of this fact. - Bruce Truter


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Sat Jan 22, 2011 12:05 am 
Offline
Distinguished Virtual Ranger
Distinguished Virtual Ranger
User avatar

Joined: Wed Aug 31, 2005 12:28 am
Posts: 14137
Location: Pretoria, RSA
:whistle:

_________________
Imberbe = Combretum imberbe = Leadwood = Hardekool = The spirit of the Wildernis!

Want to know more about the SANParks Honorary Rangers? Visit www.sanparkshr.org


One positive deed is worth more than a thousand critical words.


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Tue Mar 01, 2011 11:02 pm 
Offline
Distinguished Virtual Ranger
Distinguished Virtual Ranger
User avatar

Joined: Wed Aug 31, 2005 12:28 am
Posts: 14137
Location: Pretoria, RSA
Imberbe wrote:
Explain how a male bed bug can impregnate a female bed bug without ever coming in to direct contact with her.


:tongue:

_________________
Imberbe = Combretum imberbe = Leadwood = Hardekool = The spirit of the Wildernis!

Want to know more about the SANParks Honorary Rangers? Visit www.sanparkshr.org


One positive deed is worth more than a thousand critical words.


Top
 Profile  
 
 Post subject: Re: Insect Quiz (RV)
Unread postPosted: Thu Mar 03, 2011 5:38 am 
Offline
Distinguished Virtual Ranger
Distinguished Virtual Ranger
User avatar
Award: Quiz Whiz of the Year (2013)
Joined: Tue Dec 23, 2008 5:22 am
Posts: 20150
Location: Midway between the infinite and the infinitesimal!
Award: Musketeer of the Year, Quiz Whiz of the Year (2012)
The male pierces the female's abdomen with his penis and injects his sperm through the wound into her abdominal cavity. The sperm actually diffuses through the fluid surrounding the insect's cells, until it reaches the ovaries and results in fertilization.

Very unromantic, in my opinion. :hmz:

_________________
EVERYBODY'S TR!
TR: A NEW DAY IS S-OWN
TR: NECTAREAN NICETIES OF THE NORTH
TR: PRIMEVAL PLEASURE

"Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read." (Groucho Marx)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 958 posts ]  Go to page Previous  1 ... 43, 44, 45, 46, 47, 48, 49 ... 64  Next



Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group

Webcams Highlights

Addo Nossob Orpen Satara
Addo Nossob Orpen Satara
Submitted by Jurie van Vuuren at 12:26:03 Submitted by teddy_rsa at 14:19:08 Submitted by grannyb at 23:42:22 Submitted by grannyb at 22:32:14