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Biologija mora i okeanografija


chandra

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Kad već prebiram po snimcima, evo i kako se morske zvezde okreću. Jedna sve po pe-esu i na normu, minut ipo. Druga se malo muči dok razmišlja pa to traje ihaha, ali desetka za umetnički dojam!

 

 

 

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On 13.1.2021. at 21:00, peralozac said:

Kad već prebiram po snimcima, evo i kako se morske zvezde okreću. Jedna sve po pe-esu i na normu, minut ipo. Druga se malo muči dok razmišlja pa to traje ihaha, ali desetka za umetnički dojam!

 

 

evo jednog konkurenta apropo plesa i jos vise neverovatne pescane kreacije(!) pod vodom - japanese puffer fish:

 

 

:heart: kako je ovo objasnjivo..?

 

(kacila sam to vec negde ali super sto sada postoji ovaj topik, pa je sad na pravom mestu)

 

 

inace saznala za ovo gledajuci odlicno predavanje Anne Teresa De Keersmaeker (kacim video u spojleru za plesne entuzijaste - preporuka!)

Spoiler

 

 

 

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Možemo to nazvati umetnošću? Jeste fascinantno ali nije jedini primer da se koristi art of seduction. Možda je u stvari i čovečanska umetnost to isto a ne "odraz duše (u) štali"

Inviato dal mio Mi 9 Lite utilizzando Tapatalk

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47 minutes ago, roksi said:

 

evo jednog konkurenta apropo plesa i jos vise neverovatne pescane kreacije(!) pod vodom - japanese puffer fish:

 

 

:heart: kako je ovo objasnjivo..?

 

(kacila sam to vec negde ali super sto sada postoji ovaj topik, pa je sad na pravom mestu)

 

 

inace saznala za ovo gledajuci odlicno predavanje Anne Teresa De Keersmaeker (kacim video u spojleru za plesne entuzijaste - preporuka!)

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Ludilo! Verovatno ima nekakvu prakticnu svrhu tipa gnezda za polaganje jaja, ali sama cinjenica da je taj mali mozak u stanju da sve to "zamisli" i ostvari je fascinantna. A mozda najvise to kako uspe da "nauci" vestinu, tj. kako se prenosi s generacije na generaciju. Je li pattern uvek isti ili varira? Podsetilo me ne bowerbirds - bio je na Netflixu dokumentarac, mislim Dancing Birds da se zvao.

 

Ima i sve vise klipova riba koje koriste "alate". Evo clanka:

https://www.scientificamerican.com/article/fishes-use-problem-solving-and-invent-tools/

 

 

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8 hours ago, chandra said:

 

Ludilo! Verovatno ima nekakvu prakticnu svrhu tipa gnezda za polaganje jaja, ali sama cinjenica da je taj mali mozak u stanju da sve to "zamisli" i ostvari je fascinantna. A mozda najvise to kako uspe da "nauci" vestinu, tj. kako se prenosi s generacije na generaciju. Je li pattern uvek isti ili varira? Podsetilo me ne bowerbirds - bio je na Netflixu dokumentarac, mislim Dancing Birds da se zvao.

 

 

 

 

meni je fascinantno kako je bez omaske svestan centra gnezda, plus detalji (vrlo jasne i konsistentne razlike u formi izmedju spoljasnjeg i unutrasnjeg kruga). neverovatna suptilnost!

 

malo sam guglala pa sam naisla na, cini mi se, ok clanak/paper* gde objasnjavaju i rasclanjuju tehniku kreiranja gnezda (pokusali su da dekodiraju i simuliraju sistem putem racunara).

 

sto se tice sheme gnezda, izgleda da je uvek ista s malim varijacijama uslovljenim velicinom/dimenzijama ribe:

 

 

"We found that an increased body width of pufferfish (b, 167%) produced a smaller number of ditches (Figs. 5A,B), and a similar result was obtained with an increased factor of sand diffusion (f, 140%) (Fig. 5C). These results suggest that the physical traits of pufferfish may influence the geometric pattern of nest structures.

(...)

Additional information we could obtain from the simulation was the relationship between the physical status of the fish and the generated pattern. As shown in Fig. 5, at least in our simulation, larger fish or stronger fish that pushes the sand farther generated the ditch pattern with wider spacing. This result suggested that the female fish may know the body size of the male fish from the nest pattern. In some species, nest designs are regarded as extended phenotypic signals, which influence mate choice by attracting partners(iz istog clanka)

 

 

*Mizuuchi, R., Kawase, H., Shin, H. et al. Simple rules for construction of a geometric nest structure by pufferfish. Sci Rep 8, 12366 (2018). https://doi.org/10.1038/s41598-018-30857-0

 

 

Quote

Ima i sve vise klipova riba koje koriste "alate". Evo clanka:

https://www.scientificamerican.com/article/fishes-use-problem-solving-and-invent-tools/

 

uu, super! hvala za ovo:)

 

 

 

8 hours ago, mlatko said:

Možemo to nazvati umetnošću? Jeste fascinantno ali nije jedini primer da se koristi art of seduction. Možda je u stvari i čovečanska umetnost to isto a ne "odraz duše (u) štali"

Inviato dal mio Mi 9 Lite utilizzando Tapatalk
 

 

mozda:) 

 

Edited by roksi
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E, a pazi ovo - https://www.mdpi.com/2076-3263/11/1/22/htm

 

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This study set out to explore the critical flow features within the geometric nests built by the pufferfish, required for understanding the nest’s habitat conditions and the significance of the topological features to engineering. This study has shown how digital photogrammetry can be used alongside historical video footage to reconstruct the nest and surrounding terrain features. CFD simulations were conducted on the 2D cross-section of the nest along the flow direction with the maximum dimension, to assess the effect of the nest’s topographic features (such as valleys and ridges), on the flow field. The investigation of pufferfish nest has shown that:
  • The topology of the nest contributes to the reduction of flow velocity and formation of a recirculation zone within the nest site that ensures eggs are protected from adverse velocity fluctuations, improved aeration and additionally act as a barrier blocking transport of foreign particles into the nest;
  • The previously observed behavior of male pufferfish decorating peaks with shell fragments ensures a resilient structure through improved shear strength in regions of high shear stress;
  • Lower shear stress is seen within the central zone of the nest, ensuring a stable bed surface for spawning of eggs.

 

 

A ima i ovo - https://www.sciencedirect.com/science/article/abs/pii/S0029801818303627

 

 

Primenjena umetnost?

 

I mnogo toga stvorenog od strane ljudi pod etiketom umetnosti, s umetnoscu nema mnogo veze. Ali stagod ovo bilo, impresivno je!

Edited by chandra
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Pored hobotnica i orki, moja najveca podvodna opsesija su mante.

 

 

 

 

 

 

 

 

Ludilo od 3D videa -

 

 

I malo ozbiljnije studije -

 

 

 

 

 

 

 

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9 hours ago, chandra said:

Pored hobotnica i orki, moja najveca podvodna opsesija su mante.

 

 

uh, divne! videla ih prosle godine uzivo, oduzimaju dah - ogromne su! 

 

(da zamracim, bese steve irwin stradao od njih? :sad:)

 

 

edit: ups, verovatno ih mesam sa stingrays :unsure:

Edited by roksi
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On 16.1.2021. at 22:29, roksi said:

 

uh, divne! videla ih prosle godine uzivo, oduzimaju dah - ogromne su! 

 

(da zamracim, bese steve irwin stradao od njih? :sad:)

 

 

edit: ups, verovatno ih mesam sa stingrays :unsure:

 

zavidim ti. gde si ih videla? u akvarijumu ili okeanu? samo par akvarijuma ih ima - prevelike su. i te sto imaju, uhvacene su ko mlade jedinke, drze ih par godina i vrate u more - prebrzo rastu.

 

ako si ih gledala u okeanu, zavidim ti i koliko se zavideti moze :D meni je okean ispred kuce, ali ne mogu/ne smem duze da ronim, a s broda se bas retko vide - ovuda samo migriraju.

 

jest, Irwina je stingray ubila. Interakcije manti s ljudima su bezopasne, a ima dosta nekih slucajeva pozitivnih i intenzivnih susreta.

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Pridruzujem cesticu opstem odusevljenju mantama. Gledao ih u plicaku kako viluju tamoamo.

Zato je susret sa elektrorazama na bosu nogu prilicno upecatljiv. Torpedo sinuspersici se vika; imadoh utisak da mi je neka karakondzula odgrizla nogu dokolena, a sve setajuci se bezbrizno po plicaku.

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