I am a Biological Oceanographer and Certified Scientific Diver from Germany. I started diving in 2005 and since then it become not only my passion but also my profession. Love everything underwater, but corals are my favourites. Follow me on instagram: scientifidiver
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Timur K (t) Being underwater, weightless in a 3D space surrounded by phenomenal views is a really a spiritual experience for me. I once had a conversation with a turtle. True story. Founder of the DiveAdvisor Project. SDI-TDI-ERDI Advanced Adventure Diver
Does oxygen availability explain gigantism of polar marine animals?
Chapelle and Peck (1999) have shown that gigantism is part of a trend to large size at low temperature and that this is also associated with reduced salinities. Although the Maximum Potential Size (MPS) is mostly dependent on the oxygen availability, rather than temperature or salinity. Chapelle and Peck (1999) indicated that the reduction in metabolism with temperature and the carrying capacity of circulating haemolymph are not major factors.
Why have Antarctic Icefishes lost hemoglobin and / or myoglobin?
The Channichthyidae family is one of eight families within the perciform suborder Notothenioidei and it is suggested, that the event of losing hemoglobin happened prior to the radiation of the family, and at or near the time of divergence from the notothenioid lineage (O'Brien and Mueller, 2010).
Psammon - it's not just sand
Sandy bottoms are characteristic for bays and coastal lowlands. Generally they are found where currents and waves are strong and lead to a washing out of fine clay and silt particles and organic which are then spilt away. However, granular material settles down and deposits. The sands we find in shallow water are relatively coarse, with increasing depth, sediments become also finer and the proportion of deposited organic material inceases. The character of the sandy bottom is determined by the water movement, as currents and the surf of waves leaches out the fine, organic particles and leaves the coarser sand grains.
Hard bottom - a highly coveted habitat
Compared to the widely extended areas of the soft bottom, the submarine hard bottom is – in terms of area - the smallest habitat. This habitat displays a big variety of structures and the typical organisms inhabiting these. The majority of animals living in this habitat are sessile, meaning they are attached to the ground and therefore at the mercy of the surrounding water conditions (especially concerning currents and light).
Echinoderms and divergent development
With their variety of shapes they are a prime example of divergent development. The concept of divergence can be defined as the development of closely related organisms in different directions due to different adjustments to their habitat and/or lifestyle. Therefore every organism occupies a certain ecological niche
Reviews
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I already went on two Dive Safaris with this fleet and both times (Wreck/North Tour, Red Sea, Egypt). were absolutely great! We had an awesome guide (Sven) and a wonderful and very courteous crew. Whenever I will go on a longer Dive trip in the Red Sea again I will choose the Sea Serpent Fleet!
Egypt
Sea Serpent