Tag: ecosystem

What’s a bivalve mollusk?

Bivalve mollusks (e.g., clams, oysters, mussels, scallops)

A roughfile clam from the Flower Backyard Financial institution Nationwide Marine Sanctuary—simply considered one of many various bivalve mollusk species.


Like fish, bivalve mollusks breathe by way of their gills. As filter feeders, bivalves collect meals by way of their gills. Some bivalves have a pointed, retractable “foot” that protrudes from the shell and digs into the encircling sediment, successfully enabling the creature to maneuver or burrow.

Bivalves even make their very own shells. An inside organ known as the mantle secretes calcium carbonate in order that because the inside invertebrate grows, the outer shell supplies a roomier house.

Many bivalve species play vital roles in aquatic and marine ecosystems by filtering the water and serving as habitat and prey for quite a lot of sea life. This various group of species, estimated at about 9,200, inhabits just about the complete world ocean, from the balmy tropics to the sub-zero Arctic, and from the deep ocean to sandy and rocky shorelines. Just a few have even taken up residence round hydrothermal vents discovered deep within the Pacific Ocean, under 13,000 toes.

If the bivalve’s organic brilliance alone fails to impress, then contemplate that NOAA estimated the 2011 financial worth of economic bivalve mollusk harvesting at about $1 billion yearly within the U.S., and the burden of the harvest was estimated at 153.6 million kilos.

What’s a wetland?

VIDEO: What’s a wetland? This is what it is advisable to know in lower than a minute. Transcript

There are a lot of completely different sorts of wetlands and some ways to categorize them. NOAA classifies wetlands into 5 normal varieties: marine (ocean), estuarine (estuary), riverine (river), lacustrine (lake), and palustrine (marsh). Frequent names for wetlands embrace marshes, estuaries, mangroves, mudflats, mires, ponds, fens, swamps, deltas, coral reefs, billabongs, lagoons, shallow seas, bogs, lakes, and floodplains, to call only a few!

Typically discovered alongside waterways and in floodplains, wetlands fluctuate extensively because of variations in soil, topography, local weather, water chemistry, and vegetation. Massive wetland areas may be comprised of a number of smaller wetland varieties.
 
Wetland habitats serve important features in an ecosystem, together with performing as water filters, offering flood and erosion management, and furnishing meals and houses for fish and wildlife. They do greater than maintain crops and animals within the watershed, nonetheless. Many wetlands should not moist year-round as a result of water ranges change with the seasons. In periods of extreme rain, wetlands take in and gradual floodwaters, which helps to alleviate property harm and will even save lives.

Wetlands additionally take in extra vitamins, sediments, and different pollution earlier than they attain rivers, lakes, and different waterbodies. They’re additionally nice spots for fishing, canoeing, mountaineering, and bird-watching, and are fulfilling outside “school rooms” for individuals of all ages.

Video Transcript

Wetlands are discovered alongside waterways and in floodplains. They arrive in all sizes and shapes. Wetlands filter water, offering flood and erosion management. Wetlands have been as soon as considered ineffective swamps. However now, we all know they’re house to ample fish and wildlife.