Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Marine larval ecology wikipedia , lookup
Raised beach wikipedia , lookup
Marine debris wikipedia , lookup
Brown algae wikipedia , lookup
The Marine Mammal Center wikipedia , lookup
Marine microorganism wikipedia , lookup
Marine habitats wikipedia , lookup
Marine pollution wikipedia , lookup
Marine life wikipedia , lookup
Ecosystem of the North Pacific Subtropical Gyre wikipedia , lookup
Marine Life and Ecology 2. From phytoplanktons to invertebates Virtually all primary productivity on land comes from large plants … seaweeds such as these do exist, but they need shallow water where Sunlight is available and firm substrate for anchorage by their holdfasts. … whereas microscopic unicellular plants (diatoms, dinoflagellates) and algae account for most of the ocean’s primary productivity. Phylum Phaeophyta or Brown Algae Seaweeds are large marine multicellular algae. These nonvascular plants are grouped as green, red and brown algae. Phylum Rhodophyta or Red Algae Phylum Chlorophyta or Green Algae Unicellular Marine Life Size Bacteria <5 m Skeletal material None Habitat Benthic Producers (photosynthesizers) None 5 m Surface waters CaCO3 3-10 m warm open ocean SiO2 5-40 m cool open ocean SiO2 20-80 m upwelling 10-50 m Cellulose warm quiet waters or none Blue-green algae Coccolithophores Silicoflagellates Diatoms Dinoflagellates Consumers (Oxidizers) Protozoans Radiolarians Foraminifera 50-500 m 100-1000 m SiO2 SiO2 Surface waters and sediments Moss Fern Marsh grass Kelp bed Cell counts per 50 cm3 of water 800 Diatoms Coccolithophores 400 Dinoflagellates 0 0 800 1600 Distance from shore (km) 2400 Land plants Marine plants Spermatophytae Spermatophytae (seed bearing plants) (seed bearing plants) Pteridophytae (ferns) Bryophytae (moss) Thallophytae Thallophytae (algae and fungii) (algae and fungii) Mangroves thrive in warm tropical waters, kelp prefers cooler waters. Photomicrograph of tiny marine bacteria (~1 m) attached to the larger diatoms. Cyanobacteria (x 3000 magnification) Diatoms Coccolithophores Dinoflagellates Marine animals Marine invertebrates Phylum Porifera (Sponges) Phylum Cnidaria (Corals, Portugese Man-of-War, Jellyfish) Phylum Mollusca (Clams, Snails, Octopi) Phylum Anthropoda (Crabs, Shrimp, Lobsters, Copepods) Phylum Echinodermata (Sea Stars, Brittle Stars) Marine worms (Polychaeta, Vestimentifera) Marine vertebrates As Robert May (Scientific American, October 1992) has argued, most of the species display a predictable relation between physical size and population size: the smaller they are, the more abundant they tend to be. Implication: More species < 1 mm await discovery than ones > 1 cm. 1 mm 1 cm Characteristic size (meters) 1m Jellyfish are cnidarians which lack the polyp stage of the life cycle. Therefore, they are always in the medusae stage. They are considered plankton because they cannot swim on their own--they are dependent upon the current to take them places. They are normally found in the epipelagic layer of the ocean. The deep scattering layer Zooplankton concentration shows two peaks in the very productive summertime subarctic or cold temperate waters: • some are feeding at the surface, while • others are resting, or metabolizing what they have consumed, just below the photic zone. In contrast, in the tropics, the zooplankton concentration is on the photic surface waters. Yellow sponges on a reef. Sponges are filter feeders they filter their food particles from water that passes through them. An anemone is a cnidarian, a simple animal consisting of an open gut surrounded by tentacles - stinging cells in these tentacles help paralyze small prey that the tentacles then help bring into the gut. Jellyfish, a cnidarian, consuming a fish that it has captured Is Jellyfish a plankton or a nekton? Different species of jellyfish have different innate buoyancies, so when they are not swimming, some hang neutrally in the water, while others slowly sink when passive; a few float. Some of them are rather small, often less than an inch (or 2.5 cm) and also often found in freshwater as well are subject to the oceans currents, tides and waves for their large-scale movements. But giants like the Lion’s Mane Jellyfish* are known to be excellent swimmers. This is the largest known species of jellyfish, and is mostly found in cold waters north of 42°N (Arctic, North Atlantic and the North Pacific) and off Australia and New Zealand. The largest recorded specimen, found washed up on the shore of Massachusetts Bay in 1870, had a bell (body) with a diameter of 2.3 m (7 feet 6 inches) and tentacles 36.5 m (120 feet) long. It was longer than a Blue Whale, the longest known animal in the world. * The Sherlock Holmes story, The Adventures of the Lion’s Mane, is centered around a professor who is mysteriously killed. At the end of the story, Holmes discovers the killer is a huge Lion's mane jellyfish. Bizarre new jellyfish discovered 18:03 07 May 03 NewScientist.com news service A bizarre new species of jellyfish has been discovered in the deep waters off the Californian coast. The bell-shaped creature spans a meter in diameter and has been nicknamed "big red", because of its unusual deep red color. The US and Japanese teams that discovered it say the species deserves its own subfamily. Tiburonia granrojo was discovered using video cameras on deep-diving remotely operated vehicles (ROVs). Its color and shape set it apart from its other gelatinous relatives, but it has another unusual characteristic — a complete lack of tentacles. Phylum Porifera Purple and Yellow Tube Sponge Orange Finger Sponge The animals of the class hydrozoa have both a polyp and medusa stage. Siphonophores are a type of hydrozoan with a float for buoyancy. Probably the most famous of these is the species physalia, the Portugese-man-ofwar, which is a type of colonial siphonophore. Marine worms include Octopus Mussels krill crabs barnacles sea urchin starfish sea cucumber