Entries Tagged "squid"

Page 52 of 108

Friday Squid Blogging: Bioluminescence as Camouflage

Interesting:

There is one feature of the squid that is not transparent and which could act as a signal to prey ­ the eyes. However, the squid has a developed protection here as well. The large eyes of the squid are camouflaged with bioluminescence.

Underneath the eyes of the squid are silvery patches of cells called photophores. These provide under surface bioluminescence which adds to the camouflage. The cells leak put light in multiple directions that effectively make the squid invisible when viewed from above. The resultant glowing blur makes the eyes of the glass squid less conspicuous to predator approaching from a variety of angles.

Research paper.

As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.

Posted on June 24, 2016 at 4:39 PMView Comments

Friday Squid Blogging: More Squids

This research paper shows that the number of squids, and the number of cephalopods in general, has been steadily increasing over the past 60 years:

Our analyses revealed that cephalopod abundance has increased over the last six decades, a result consistently replicated across three distinct life history groups: demersal, benthopelagic, and pelagic… This is remarkable given the enormous life-history diversity exhibited across these groups, which were represented in this study by 35 species/genera and six families. Demersal species, for instance, have low dispersal capacity (tens of km) and occupy shelf waters. Benthopelagic species also occupy shelf waters, but have moderate dispersal capacity (hundreds of km) largely facilitated by a paralarval phase. Pelagic species inhabit open oceanic waters and have high dispersal capacity (thousands of km) facilitated by both a paralarval phase and a mobile adult phase.

News articles.

As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.

Posted on May 27, 2016 at 4:28 PMView Comments

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Sidebar photo of Bruce Schneier by Joe MacInnis.