EXPLAINED WHY WHALE SHARKS CONGREGATE IN JUST 20 LOCALITIES WORLDWIDE

EXPLAINED WHY WHALE SHARKS CONGREGATE IN JUST 20 LOCALITIES WORLDWIDE

EXPLAINED WHY WHALE SHARKS CONGREGATE IN JUST 20 LOCALITIES WORLDWIDE

We know whale sharks (Rhincodon typus), the biggest fish in the world, aggregate at just 20 coastal locations globally.  Why these animals, which can reach more than 18 m in length, choose these specific places, has perplexed researchers and conservationists. Although whale-shark aggregations had been recorded near tropics, including Mozambique, the Maldives, Honduras, Australia and others places, what causes these aggregations remain unknow.

Aggregations typically occur in the fore reef and lagoon areas, leading out to the reef slope, reef wall or continental slope, which has a steeper slope, leading whale sharks to deep-sea environment. Researchers sugests whale shark can filter food at greath depths, where the water is cold, and then bask in the sun at shallow depths, warming their cold-blooded bodies, as they depend on external sources of body heat.

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-  Location of aggregation and non-aggregation sites. Hotspots are in red.

These places are very productive, where plankton and small crustaceans abound. However, sharks swimming in shallow waters near the surface are vulnerable to accidents caused by vessels, as tourist boats which approaches them. The whale shark is considered Vulnerable on the IUCN Red List, these findings increase our understanding of whale shark behaviour and may help guide the identification and conservation of further aggregation sites.

Photo by  Abe Khao Lak

Copping et al., 2018.  Does bathymetry drive coastal whale shark (Rhincodon typus) aggregations?  Aquatic Biology section

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http://becausephytoplankton.blogspot.com/2018/09/diatoms-algae-in-glass-houses.html


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7 years ago

What’s a whale fall?

What’s A Whale Fall?
What’s A Whale Fall?
What’s A Whale Fall?
What’s A Whale Fall?
What’s A Whale Fall?
What’s A Whale Fall?

Whale falls can be found throughout the ocean. This one was spotted in Channel Islands National Marine Sanctuary, off the coast of Southern California!

GIF transcript beneath the cut.

Keep reading

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The National Science Foundation (NSF)—the major funding agency for basic science—has canceled all grant review panels this week to comply with an executive order from the new administration. This is where independent panels of scientists discuss grant proposals they’ve reviewed for scientific merit and recommend which projects get funded to NSF project managers. A LOT of work goes into setting up and scheduling grant reviews. It will take time to reschedule these panels, delaying key decisions for many promising projects. This will wreak havoc on science grant funding for months to come.

Put simply, this action along with the halting of NIH-funded grants are blatant and reckless political attacks on science, from an administration that seeks blinding loyalty.

National Science Foundation freezes grant review in response to Trump executive orders
NPR
The National Science Foundation has canceled all grant review panels this week. It's unclear how long the pause could last.

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simplyphytoplankton - Simply Phytoplankton
Simply Phytoplankton

Blog dedicted to phytoplankton. Phytoplankton are microscopic organisms that are responsible for half of the photosynthesis that occurs on Earth. Oh, and they look like art... Follow to learn more about these amazing litter critters! Caution: Will share other ocean science posts!Run by an oceanographer and phytoplankton expert. Currently a postdoctoral researcher.Profile image: False Colored SEM image of Emiliania huxleyi, a coccolithophore, and the subject of my doctoral work. Credit: Steve Gschmeissner/ Science Photo Library/ Getty ImagesHeader image: Satellite image of a phytoplankton bloom off the Alaskan Coast, in the Chukchi SeaCredit: NASA image by Norman Kuring/NASA's Ocean Color Web https://earthobservatory.nasa.gov/images/92412/churning-in-the-chukchi-sea

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