Bluewhale diving and feeding heartbeat

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bmforre
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Bluewhale diving and feeding heartbeat

Post by bmforre » Fri Dec 27, 2019 2:49 pm

Bluewhale heartbeat observations
We present a major advancement in our ability to bring the physiological laboratory to the open ocean through the noninvasive use of a suction cup-attached tag equipped with surface electrodes. Our study provides heart rate data of a large, free-diving whale (blue whale) without prior capture or restraint. We recorded a wide range of heart rates from the tag, reaching only several beats per minute during deep foraging dives (bradycardia) and nearly 40 beats per minute at the sea surface (tachycardia) as the whale recovered from its oxygen debt.
Improved instrumentation for a fabulous giant organism.
Impressive plots showing observation results.

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Brightonian
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Re: Bluewhale diving and feeding heartbeat

Post by Brightonian » Sun Feb 21, 2021 1:13 pm


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jimbob
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Re: Bluewhale diving and feeding heartbeat

Post by jimbob » Mon Feb 22, 2021 7:57 pm

Brightonian wrote:
Sun Feb 21, 2021 1:13 pm
Scroll down through the deeps
What the hell is Kelp doing at 237m down?
Have you considered stupidity as an explanation

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Fishnut
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Re: Bluewhale diving and feeding heartbeat

Post by Fishnut » Mon Feb 22, 2021 11:44 pm

jimbob wrote:
Mon Feb 22, 2021 7:57 pm
Brightonian wrote:
Sun Feb 21, 2021 1:13 pm
Scroll down through the deeps
What the hell is Kelp doing at 237m down?
It can grow surprisingly deep. While looking for a reference I came across this New York Times article from 1984 on a coralline algae that was found growing at 270m. The paper about the discovery looks to have been published a couple of years later but hasn't been digitised yet.

As a complete aside, I was really struck but the repeated references in the NYT article to Dr Littler and "his wife", as if she was more of an assistant than a peer. It felt out of another age when women had to assist their husbands rather than pursue careers of their own.
it's okay to say "I don't know"

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Bird on a Fire
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Re: Bluewhale diving and feeding heartbeat

Post by Bird on a Fire » Tue Feb 23, 2021 1:31 am

jimbob wrote:
Mon Feb 22, 2021 7:57 pm
Brightonian wrote:
Sun Feb 21, 2021 1:13 pm
Scroll down through the deeps
What the hell is Kelp doing at 237m down?
Looks like the backstroke, sir.
He has the grace of a swan, the wisdom of an owl, and the eye of an eagle—ladies and gentlemen, this man is for the birds!

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Martin_B
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Re: Bluewhale diving and feeding heartbeat

Post by Martin_B » Tue Feb 23, 2021 1:48 am

jimbob wrote:
Mon Feb 22, 2021 7:57 pm
Brightonian wrote:
Sun Feb 21, 2021 1:13 pm
Scroll down through the deeps
What the hell is Kelp doing at 237m down?
I have heard of one subsea small gas field off the north-west shelf of Australia where they had pre-installed some pipework and a tie-in port to an export pipeline as the field was going to start producing a couple of years after the main field started production. The small field was in 200m of water, and the marine experts said that it would be fine, as coral doesn't grow below 100m as there's too little sunlight.

When they were preparing to bring the small field into service they sent down an ROV and found that the pre-installed pipe (cold, painted metal) was so encrusted with coral that they couldn't get the end caps off, and an endangered octopus had taken up residence in the tie-in port. :lol:
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