#oceanfact

[fortuneindiasailing]

It's #WorldOceansDay! #DidYouKnow our #oceans employ over 200 million people, contribute to 5% of global GDP and keep us alive? let's create a #SustainableFuture #together 🌊🐳🐠🐚 Share an #OceanFact below to inspire others to #ProtectOurOceans 👇 #seaquotes #worldoceansday #worldoceansday2020 #environment #oceanlover #BluePlanet #BetterFutureplasticfree #plasticsurgery #plasticwaste #plasticpollution #worldoceansday #sustainable #lesswaste #zerowaste #ecofriendly #environmentallyfriendly #savetheplanet https://www.instagram.com/p/CBLhRMeg6oF/?igshid=1bjj4b91o2cdi

[ladyblue-laragazzadelmare]

#OceanFact n. 1

𝗭𝗼𝗼𝗽𝗹𝗮𝗻𝗸𝘁𝗼𝗻 𝗺𝗮𝗸𝗲𝘀 𝗱𝗮𝗶𝗹𝘆 𝗺𝗶𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 𝗳𝗿𝗼𝗺 𝘁𝗵𝗲 𝗱𝗲𝗲𝗽 𝘄𝗮𝘁𝗲𝗿𝘀 𝘁𝗼 𝘁𝗵𝗲 𝘀𝘂𝗿𝗳𝗮𝗰𝗲.

Zooplankton, the tiny crustaceans at the base of the food web, makes the so-called "Diel Vertical Migrations" (DVM). Usually, they tend to change depth during the day: during nighttime, they tend to be at the surface, while during the day they stay at greater depths.

This behaviour has been described first in the 19th century (Cuvier, 1817; Schmidtlein, 1879), both in freshwater lakes and in the oceans. Researchers noticed the difference in abundance of the zooplankton from day to night.

The such complex practice has so been studied for almost 200 years.

Different types of vertical migrations have been described, with different periodicities (daily, seasonals) areas of occurrence and biological significance. Although great variability exists, two of the main reasons attributed to this behaviour are the avoidance of predators that mainly rely on vision (by staying in deeper waters during the day) and the advantage of a high concentration of food at the surface (by migrating to the surface during nighttime).

The evolution of these behaviours for a simple group of species forced other levels in the food web to evolve a similar pattern. This phenomenon is called coevolution. In this way, predators learnt to make the same migrations to feed on the high densities of zooplankton.

________________________

𝗥𝗲𝗳𝗲𝗿𝗲𝗻𝗰𝗲𝘀 𝐚𝐧𝐝 𝐬𝘂𝗽𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝗿𝘆 𝗺𝗮𝘁𝗲𝗿𝗶𝗮𝗹:

Bandara, K., Varpe, Ø., Wijewardene, L., Tverberg, V., & Eiane, K. (2021). Two hundred years of zooplankton vertical migration research. Biological Reviews, 96(4), 1547-1589. https://doi.org/10.1111/brv.12715

Dodson, S. (1990). Predicting diel vertical migration of zooplankton. Limnology and Oceanography, 35(5), 1195-1200. https://doi.org/10.4319/lo.1990.35.5.1195

Hays, G. C. (2003). A review of the adaptive significance and ecosystem consequences of zooplankton diel vertical migrations. Migrations and dispersal of marine organisms, 163-170. extension://elhekieabhbkpmcefcoobjddigjcaadp/http://www.seaturtle.org/.../hays_Hydrobiologia2003.pdf

Natural World Facts (2022). The Great Vertical Migration.

Image representing the migrations from Bandara et al., 2021.

Video cut from "Natural World Facts (2022). The Great Vertical Migration". See the full video above for amazing facts!

[crystal-dive-koh-tao]

View this post on Instagram

#Repost @noaaocean ・・・ What does peanut butter have to do with the ocean? Watch this video to find out. #peanutbutter #oceanfact #ocean ​ (at Crystal Dive Koh Tao)

[respectanimalrights]

Posted by @ocean Video by©@johnnyvanuck Would you have remained this calm?😨💙 #OceanFact The north Pacific population of humpback whales makes long distance migrations. They range from winter breeding grounds in southern latitudes (Hawaii, Mexico, and Southern Asia) to northern feeding areas from California to Alaska and Russia where they spend the summer months. Humpbacks show great fidelity to their feeding areas and British Columbia is split into two separate regions. The southeast Alaska/northern British Columbia region is estimated to have a population of 3,000-5,000 whales, while the southern BC/Washington population is approximately 200-400 whales. There also appears to be a correlation between feeding and breeding grounds. The majority of humpback whales feeding in northern BC appear to be wintering in Hawaii. The southern BC whales have animals that have been re-sighted off mainland Mexico, as well as Hawaii. #RoamTheOceans

[savingthewaves]

View this post on Instagram

🌀 A group of dolphins leading a boat through the ocean..😍💙 _____________________________________ 🔘#OceanFact Dolphins are well known for their agility and playful behavior, making them a favorite of wildlife watchers. Many species will leap out of the water, spy-hop (rise vertically out of the water to view their surroundings) and follow ships, often synchronizing their movements with one another. Scientists believe that dolphins conserve energy by swimming alongside ships, a practice known as bow-riding. . Credit: @jebcorliss _____________________________________

[savingthewaves]

View this post on Instagram

🌀 Tag along for the ride on this leatherback.💙 ________________________________________ 🔘#OceanFact Leatherback turtles have the most hydrodynamic body design of any sea turtle, with a large, teardrop-shaped body. A large pair of front flippers powers the turtles through the water. Like other sea turtles, the leatherback has flattened fore limbs adapted for swimming in the open ocean. Claws are absent from both pairs of flippers. The leatherback's flippers are the largest in proportion to its body among extant sea turtles. Leatherback's front flippers can grow up to 2.7 m (8.9 ft) in large specimens, the largest flippers (even in comparison to its body) of any sea turtle. Credit: @sharkaddicts2 ________________________________________

[savingthewaves]

🌀 Come to peace with this calming video..💙 ________________________________________ 🔘#OceanFact Pilot whales emit echolocation clicks for foraging and whistles and burst pulses as social signals. With active behavior, vocalizations are more complex, while less-active behavior is accompanied by simple vocalizations. Differences have been found in the calls of the two species. Compared with short-finned pilot whales, long-finned pilot whales have relatively low-frequency calls with narrow frequency ranges. In one study of North Atlantic long-finned pilot whales, certain vocalizations were heard to accompany certain behaviors. When resting or "milling", simple whistles are emitted. Surfacing behavior is accompanied by more complex whistles and pulsed sounds. •• Credit: @miguel_apnea •• Song: Alina Baraz & Galimatias - Drift (SugarBeats Remix) ________________________________________

[savingthewaves]

View this post on Instagram

🌀 Would you have remained this calm?😨 ________________________________________ 🔘#OceanFact The north Pacific population of humpback whales makes long distance migrations. They range from winter breeding grounds in southern latitudes (Hawaii, Mexico, and Southern Asia) to northern feeding areas from California to Alaska and Russia where they spend the summer months. Humpbacks show great fidelity to their feeding areas and British Columbia is split into two separate regions. The southeast Alaska/northern British Columbia region is estimated to have a population of 3,000-5,000 whales, while the southern BC/Washington population is approximately 200-400 whales. There also appears to be a correlation between feeding and breeding grounds. The majority of humpback whales feeding in northern BC appear to be wintering in Hawaii. The southern BC whales have animals that have been re-sighted off mainland Mexico, as well as Hawaii. Credit: @johnnyvanuck •••