Search results
Results from the WOW.Com Content Network
Organisms here, known as bottom dwellers, generally live in close relationship with the substrate and many are permanently attached to the bottom. The benthic boundary layer , which includes the bottom layer of water and the uppermost layer of sediment directly influenced by the overlying water, is an integral part of the benthic zone, as it ...
These organisms can be used to indicate the presence, concentration, and effect of water pollutants in the aquatic environment. Some water contaminants—such as nutrients, chemicals from surface runoff, and metals [20] —settle in the sediment of river beds, where many benthos reside. Benthos are highly sensitive to contamination, so their ...
Many marine organisms exhibit a high degree of movement or dispersal. [74] The fish attracted to artificial reef zones vary from reef to reef depending on the reef's age, size and structure. [75] Preferred habitats vary both between and within species, depending on an organism's developmental stage and behavior.
At such thickness, the SML represents a laminar layer, free of turbulence, and greatly affecting the exchange of gases between the ocean and atmosphere. As a habitat for neuston (surface-dwelling organisms ranging from bacteria to larger siphonophores), the thickness of the SML in some ways depends on the organism or ecological feature of interest.
A living example was trawled from the bottom of the Puerto Rico Trench in 1970 from a depth of 8,370 metres (27,453 ft). [ 37 ] [ 38 ] In 2008, a shoal of 17 hadal snailfish , a species of deep water snailfish , was filmed by a UK-Japan team using remote operated landers at depths of 7.7 km (4.8 mi) in the Japan Trench in the Pacific.
Another anthropogenic force that degrades coral reefs is bottom trawling; a fishing practice that scrapes coral reef habitats and other bottom substrate-dwelling organisms off the ocean floor. Bottom trawling results in physical wreckage and stress that leads to corals being broken and zooxanthellae expelled. Similar to bottom trawling, rock ...
Amphioctopus aegina, commonly referred to as the marbled octopus or the sandbird octopus, [2] is a bottom dwelling species residing in the coastal zone of the Indo-West Pacific. [ 3 ] Planktonic hatchlings and eggs are laid by females predominantly during the months of January and October, however they have been known to reproduce year-round.
Algal blooms limit the sunlight available to bottom-dwelling organisms and cause wide swings in the amount of dissolved oxygen in the water. Oxygen is required by all aerobically respiring plants and animals and it is replenished in daylight by photosynthesizing plants and algae. Under eutrophic conditions, dissolved oxygen greatly increases ...