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Saturday 28 August 2021

Dreadful Faint-banded Sea Snake

   

Hydrophis belcheri, c
ommonly known as the faint-banded sea snake which has been concerned as highly venomous species of Elapidae family. This species is considered as one of the most deadliest snakes in the world, due to its potent venom. One drop of the faint-banded Sea Snake’s venom is capable of killing a human within minutes.

This species mostly confined to tropical reefs in Indian Ocean, Gulf of Thailand and Australia. The snakes are often found along shallow areas, close to the coast, as most its prey is easier to find in these regions and also provide natural protection from predators. Their natural habitat that closer to the coastline is one of the dangerous impact that causes greater contact with human. Hence, it is appropriate to identify faint-banded sea snake to prevent from danger.

The sea snake grows to impressive lengths by adulthood, at approximately one meter in length and has a thin, chrome colored body with yellow and green crossbands. They possess a small, flattened head, along with a compressed body and set of scales. It is capable of moving throughout the water at high speeds, approximately twelve miles per hour. They also possess a flattened tail which is similar to a flipper that they use to move quickly through the water.

The drastic level of their venom

The venom of the faint-banded Sea Snake is so toxic, that a single bite can kill a human being in less than thirty minutes. Some studies have even indicated that the venom may be a hundred times more toxic than the deadly Inland Taipan Snake. Venom contains high levels of neurotoxins and myotoxins, one drop of the snake’s venom is capable of killing 1,800 people.

Symptoms

A snake’s bite may cause extreme vomiting, nausea, migraines, excruciating abdominal pain, diarrhea, dizziness, convulsions, and paralysis. Other symptoms include hysteria, uncontrollable bleeding, as well as respiratory and kidney failure. Although antivenoms have been developed to combat the toxicity of the snake’s bite, immediate treatment is crucial for survival.

Fortunately, faint-banded sea snake has a timid temperament and would normally have to be subjected to severe mistreatment before biting. Usually those bitten are fishermen handling nets, although only a quarter of those bitten are envenomed since the snake rarely injects much of its venom. Because of this docile nature of faint-banded sea snake, it does not cause on severe danger.





Article By - Sachini Karunarathne


References: - 

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Thursday 26 August 2021

Alongshore webinar series 1.0 ; Webinar #3

 පෘථිවි ජෛව විවිධත්වයට  විශාල දායකත්වයක් ලබා දෙන කොරල් පර සාගරයේ වැසි වනාන්තර ලෙසින් හඳුන්වයි. මිනිස් ක්‍රියාකාරකම් හේතුවෙන් අද වන විට අප සාගරයට අහිමි වෙමින් පවතින කොරල්පර  සම්පත හායනය පිළිබඳ දැනුවත් වීම හා සංරක්ෂණය අප සතු වගකීමකි.

ශ්‍රී ජයවර්ධනපුර විශ්වවිද්‍යාලයේ ජලජ ජීව විද්‍යා ශිෂ්‍ය සංගමය මඟින් සංවිධානය කරනු ලබන සම්මන්ත්‍රණ මාලාව "Alongshore", එහි තෙවන පියවර තබමින් 

"සහ කළමනාකරණය තුළින් ශ්‍රී ලංකාවේ කොරල් පර සංරක්ෂණය "

යටතේ හරවත්, විද්වත් ඒ වගේම රසවත් කතිකාවතක් ගොඩනගන්නට සියල්ල සූදානම් කර තිබේ.

මෙවර සාකච්ඡාව සඳහා සම්පත් දායකත්වය, IUCN ශ්‍රී ලංකා කාර්යාලයේ සමුද්‍ර හා වෙරළාශ්‍රිත විශේෂඥ ආජන් රාජසූරිය මහතායි.

දිනය      -අගෝස්තු මස 27 වන සිකුරාදා 

වේලාව - පස්වරු 5 සිට 6 දක්වා 

මාර්ගගත ක්‍රමයන් ඔස්සේ ZOOM තාක්ෂණය හරහා ඔබටත් මේ අගනා අවස්ථාව සමඟ අප හා සම්බන්ධ වීමට හැක.

පහත සබැඳිය හරහා ඔබට එදින සාකච්ඡාවට සම්බන්ධ විය හැක


https://learn.zoom.us/j/66492191932?pwd=d3VveXRRZE5hMWovcmlGWFg2cTREZz09


Meeting ID: 664 9219 1932

Passcode: vZ3fZdX$

#Alongshore #WebinarSeries #FreeWebinar

#USJAquatics



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Saturday 21 August 2021

Icy Greenland and Warm Iceland

 Names of countries are always interesting to study. Some names reveal the geography while some reveal the pioneers who discovered them in the new world. Countries like Greenland and Iceland too have very interesting names. The land of Greenland in covered by about 80% ice sheet while in Iceland you can see lots of greenery. So what caused this very confusing naming. To find out the reason for this naming which has been an internet joke for many years we must go back to the early settlers and when the land was discovered in the medieval age.

The early settlers of Iceland were Vikings. The motherland of Vikings is the region now called Norway, Denmark and Sweden. These men who were also referred to as Norsemen, were strongly rooted in a seafaring culture. They fashioned themselves as warriors, traders and explores.

One such Viking was Naddodd the Viking. He was on a sea journey when he was blown off course and landed in a new land in the year 830 CE. Shortly after he left. After Naddodd left a Viking by the name Gardar the swede followed in his footsteps to this new land and named it after himself as “Gardar’s island”. This was in 860 CE. After Gardar left, a Viking named Flóki Vilgerðarson came to this land to colonize it. However, when he tried to leave this island for his homeland, modern Norway, he was blocked by ice in the sea. Having to stay for much longer than he planned, he lost most of his livestock and his daughter due to the cold. He named this land he saw filled in sorrow and ice as Iceland.

When he finally went home to Norway he spread the word that Iceland was inhospitable. However, two members of his crew started a rumored that this land was filled with lush grass and was so beautiful. Trusting the words of these crew members, people of Norway migrated to Iceland. They found a beautiful grassy land as was their expectation.

The temperature of Iceland is actually warmer than those in similar regions. This warmth is given to the land by the gulf stream that runs near the west side of the island. You can think of the gulf stream as a river in the ocean which carry warm water from the coast of Florida (the gulf stream is a result of the suns gravity, rotation of the earth, climate in the north and south poles and many other factors). The gulf stream warms the water near the coast of Iceland by about 6 C.

The Vikings in Iceland enjoyed the benefits of the gulf stream. They formed their own unique identity in Iceland. The people in Iceland formed an equalitarian society. In 982 CE the Viking Erik the Red was a subject to this society and he was exiled for his crime of murder. Eric the red left Iceland and found a new land further north. He started a settlement in this new region with a fleet of 14 longships. He named this land he found as Greenland to attract more people. You could say that the name Greenland was a medieval marketing scheme.

Back then around the year 985 CE, it is believed that Greenland was actually much warmer. This time period between 900-1300 CE is known as the medieval warm period. The seas were much calmer as the water receded as a byproduct of the warming, and sailing was much easier for these Vikings. However, this warm period lost its effect in Greenland in 1257 CE. In that year a volcano in the Lombok island of Indonesia erupted. This massive eruption had far reaching consequences. The sulfur released from this volcano to the stratosphere reflected solar energy back to the space cooling the earth’s climate. The effect of this disaster lasted for decades, in to the 1320’s. Greenland which was at the edge of the known world cooled further down making the land inhospitable. The Greenland you see today was not the same when it was given its name.

However, as the globe is rewarming people in Greenland are facing a different set of challenges. When glaciers melt they often break. This might cause sudden tide rise in the rivers. they continue to face sudden, harsh winters interspersing with wet springs. The people in Greenland continue to live with these grim realities.

The melting of glaciers also affects Iceland. the cold water from the melting ice flow from the north. This increasingly cold water reduces the effect of the gulf stream and slows it down. With the effect of gulf stream, which the life line of Iceland, slowed down, the climate in Iceland changes vary rapidly. Iceland is going to be much colder and fit its name much better in the near future.

The way the ocean moves and its various quirks are a major factor in regulating the climate. With the rapid change in climate these factors are altered. Even if the effect of the climate change does not reach us in Sri Lanka, these countries are paying for our mistakes with their lives.

Climate change has always happened throughout the history, and with it you can follow the footsteps of the ancient sapiens as they migrated. The changes in the sea levels in various periods facilitated the colonization of new lands by sapiens. Some of these lands still continue to boast their ancient names.



Article By - Chamudi Semini

Reference :-

·       https://www.nationalgeographic.com/science/article/iceland-greenland-name-swap

·       https://www.britannica.com/topic/Viking-people

·       https://www.livescience.com/32087-viking-history-facts-myths.html

·       https://www.smithsonianmag.com/history/why-greenland-vikings-vanished-180962119/

·       https://www.mountainguides.is/blog/icelands-climate-moves-with-gulf-stream

·       https://www.worldhistory.org/article/1310/the-vikings-in-iceland/

·       https://www.worldhistory.org/article/1208/viking-age-greenland/


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Friday 20 August 2021

2020/2021- Office Bearers


 
Senior Advisor
Senior Prof.M.M.Pathmalal
Dean, Faculty of Graduate Studies
Chair Professor, Department of Zoology, University of Sri Jayewardenepura, Sri Lanka.

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Monday 16 August 2021

Impacts of noise pollution on marine life

 Ocean noise pollution has become one of the major threat for the marine animals and the health of the ocean invisibly to our eyes. Noise pollution is an intense, widespread anthropogenic disturbance that can have highly detrimental impacts on natural populations, communities, and ecosystems across the globe.

Different sources of noise pollution;

    ·  Sonar sounds used in submarine detection.             
    ·   Underwater nuclear and chemical explosions.
    ·   Commercial Shipping traffic
    ·   Seismic air gun noise from oil and gas exploration.
    ·    Industrial activities and constructions.
    ·   Fishing and merchant vessels.
    ·   Military, navigation and research sonars. 




    When we add artificial noises to natural environment, it can alter the acoustic environment of these marine habitats. This can cause a range of problems from Physiological damages, Individual level impacts and disruption of behavior and startling.

  •  Permanently damage (Permanently threshold shift) or temporally damage (temporally     threshold shift) to the auditory system.
  • They may suffer chronic effects. Longer term stress can be decreased with ability to resist   diseases, survive, successfully reproduction and reduced food consumption. Hormone levels can  be changed.                                                                                                        

  • Masking occurs when the perception of a sound is affected by presence of background noise. It     can decrease the efficiency of acoustic communication. So it reduces the ability of their  communication, navigation, locating prey, avoiding predators, and finding mates. 
  •  Underwater noise pollution is more painful them. Exposure to extreme underwater noise in many hours causes the death of animals and some are beaching soon. Deaths can occur due to    hemorrhages, changed diving patterns, migration to newer places and damage to internal organs  and an overall panic response to foreign sounds. 
          E.g.:- whales can die soon 
  • Some marine animals dislocate or move to newer location as a survival mechanism. It can change he marine diversity balance. 
  • Noise pollution affect every living organisms in the sea, but mainly impact to dolphins, seals, fish,squid, crustacean, and sea turtles. Because they use sound to hunt, find mates, reproduce, and communicate with their babies.

 



·   Exposure to noise during embryonic stage increases sensitivity of fish to noise.

·  Increase the mortality rate of birth.  

· Some fish larvae find their home by following the sounds of coral reefs. Increasing the       noise make more difficult to find the suitable reefs could reduce their life span. 


Scientists present different solutions to reduce the noise pollution. Such as,

·   Develop the greener technology including quieter ships, hulls shapes and machinery. 

·  Optimized noise reduction design can be used to ships and other machines.

·   Avoid from over exploitation of marine resources. 

·   Establish the rules and regulations to minimize the ocean noise pollution not only in national level but also international level.


Ocean is the breath of life in the world, because it regulates so many phenomena to create beautiful and healthy world.  It regulates carbon dioxide, produces two thirds of our oxygen, and rich with high biodiversity from spectacular organisms. The ocean is the top place where we can find life. If the ocean dies, and becomes lifeless, the whole ecosystem of world will collapse. That’s why we need to protect species underwater and preserve the ocean to maintain life. 

References-

·        ·   https://www.ifaw.org/eu/journal/interview-ocean-noise-pollution-impact-marine-animals

·        ·   https://news.mongabay.com/2021/02/for-marine-life-human-noise-pollution-brings-death-by-a-               thousand-cuts/

Article by – Ishini Devindi






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Saturday 7 August 2021

10 Totally Transparent Marine Animals

   Transparency is a rather common characteristic among open-ocean living marine animals. Because there are few structures to hide behind in the open ocean, many creatures that dwell there employ transparency as a form of camouflage to avoid predators. Some marine predators employ transparency to aid in the capture of unwitting victims.
 

 1. Barreleye Fish


This deep-sea dweller, sometimes known as the spook fish, can be found in the tropical-temperate seas of the Atlantic, Pacific, and Indian Oceans. The barreleye fish can capture even more light in the deepest of depths because to its huge tubular eyes and dome-shaped, transparent skull.

2. Sea Salp


The sea salp is a planktonic tunicate. The barrel-shaped organism uses jet propulsion to move across the water by pumping water through its body. For their phytoplankton food source, the filter feeders strain the water. Sea salps are most typically found in the Southern Ocean, where they can be found single or in extended chains.

3. Big Skate


There's nothing surprising about this. The giant skate is the largest skate species, and it may be found all along the Pacific coast (from Baja California to Alaska). Their very light skin allows their internal organs to be visible.

4. Sea Walnut


The sea walnut is a comb jelly species with an oval-shaped, lobed body and four rows of ciliated combs running vertically down the body. This insect is not only translucent, but its ciliated combs also illuminate blue-green when disturbed.

 5. Glass Octopus


Despite the fact that the transparent and gelatinous species has only been captured on video a few times, the glass octopus is found in tropical and subtropical seas all over the world.

6. Crocodile Icefish


Crocodile icefish are ambush predators, which means they may go a long period between feedings and eat up to half of their body length in fish. As a result, being open and honest comes in handy. Because their blood lacks hemoglobin, they are sometimes known as white-blooded fish.

7. Glass Squid



Glass squids belong to the Chranchiidae family, which includes roughly 60 species. In the partially illuminated shallow waters, their transparency is a useful camouflaging weapon. Many species have glowing light organs behind their eyes and are bioluminescent.

 8. Transparent Sea Cucumber


The translucent sea cucumber is an almost alien-like organism that dwells about 2,750 meters beneath the ocean's surface. It moves at a rate of 2 cm per minute down the ocean floor using its many tentacles. It's not quite the speed of light.

 9. Jellyfish


These free-swimming, buoyant, umbrella-shaped critters are an aquatic favorite and can be found in any ocean. The sting of a jellyfish is dreaded on beaches all around the world, making the translucent type an even greater danger to swimmers.

10. Sea Angel



The shells of these tiny swimming sea slugs were replaced by a pair of flapping appendages. The largest and most translucent of the gelatinous species is only approximately 5 cm long. Sea angels may swim at speeds of up to 100 meters per second, outpacing their even smaller prey, the sea butterfly.

Article by:- P.A.L. Naveen Lakshitha

 References: -

1. https://earthsky.org/earth/five-see-through-animals/

2. http://awesomeocean.com/top-stories/10-transparent-marine-animals/


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