Recommended: Effects on Daphnia Magna's feeding rate
We took a large net and set it vertically in the water, and then somebody got in the creek and kicked up sediment into the net. After doing this a few times, we collected all of the creatures off of the net and into an ice cube tray. We then examined the creatures and noted the variety (or lack thereof) of the creatures. The larger the variety in the species of the creek, the healthier the creek is. We noticed several species of fly larvae such as stone fly larvae and caddis fly larvae. We also noted a few worms.
Corotto, F., Ceballos, D., Lee, A., & Vinson, L. (2010). Making the Most of the Daphnia Heart Rate Lab: Optimizing the Use of Ethanol, Nicotine & Caffeine. The American Biology Teacher , 176-179. The purpose of this article was to test the effects of chemicals on Daphnia magna.
They can sense their prey through chemoreception. They are mainly found on the east coast of North America. There are many rows of tube feet and the grooves run down the center of each arm on the oral surface. Their madreporite, usually pink, is their filter for water.
The northern snakehead preys on zooplankton, smaller fish, fish larvae, crustaceans, frogs, insects, small reptiles, and even small mammals and birds. In the areas in which the northern snakehead has invaded, native populations are having gradual decreases because of the northern snakehead’s unextinguishable appetite. The most notable features of the northern snakehead fish are its snake-like characteristics. The fish has a long cylindrical body with the blotchy coloration and patterns of a snake.
Dr. Marshall Westwood had a meal of puffer fish and rice for dinner in Indonesia on his recent trip. Within an hour, the numbness starting from his lips and tongues quickly spread out through his face and neck, and he had pains in stomach and throat with symptoms of severe nausea and vomiting. Dr. Westwood called a local hospital, for he was feared of a “bad fish” food poisoning. He told his condition and signs to hospital staff but it were impossible to speak due to the numbness of lips and face.
Some feed by swimming with their mouths wide open. Others
The diet of the Kissing Gourami is very strange. They eat microphagous filter-feeders. They also can eat algae that grows from submerged tank surfaces. The Kissing Gourami does not have a prey.
The Zombie Worm use their “root-like structures” to latch onto whale bones; the only known source of sustenance (Ennis). The structures extract the dietary needs from the bone after an acid is released and the bone is dissolved (Ennis). The oils and fats are then digested by internal bacteria (Ennis). Though little to none is known about the Yeti Crab their food source is conjectured by scientists. They have come to the hypothesis that the crabs hairs “grow mineral bacteria” (Bliss).
The L. olivacea is named after it’s olive and gray colored shell while the L. kempii is grayish green. The L. olivacea has heart-shaped top shell and the L. kempii has a nearly circular one. Their diets, while sharing a few favorites like crabs, fishes, and mollusks, mainly consist of their own preferences. The L. olivacea feeds on algae, lobster, tunicates, and shrimp while the L. kempii is more selective with only jellyfish on top of the foods they share. Their nutritional desires also reflect the environments they inhabit.
The austrocochlea porcata, or zebra top snail, named so because of its black and white striped shell. This species, although extremely common, have no two individuals that are exact identicals. The reason for this is because their stripes depend on their diet. At certain times during the year the algae they eat contains a substance that the snail excretes into its shell to form the darkned bands on the shell. It is said that the number of bands can indicate the age of this species but it has been disproved by Creese & Underwood (1976).
Introduction Predation is a biological interaction between two organisms of different species in a community in which one acts as a predator and captures and feeds on the other, the prey. Predator-prey relationships keep animal populations in balance. When prey populations increase more food is available for predators, and they increase in number as well. An increase in predators triggers a decrease in prey populations. As prey populations decrease predator populations soon follow as their food supply diminishes.
The consumers are cassowary, insects, ulysses, butterflies, whichetty grub, spotted cuscus, sugar glider, goanna, azure kingfisher, and feral pigs. Cassowaries eat the reptiles and the crocodiles eat the platypuses. Estuarine Crocodile is one of the well known species in Daintree. According to the article titled Fauna of the Daintree Rainforest. (n.d.)
The Placoderms: Where Are They Now? Introduction Fish have been around for hundreds of millions of years and probably will be for hundreds of millions of years more. This group of organisms is very diverse and contains everything from jawless fish, such as lampreys, to fish with cartilaginous skeletons, such as the sharks and rays, to fish with bones, which consist of basically every other living fish. Today, this group has huge variations in body plans and lifestyles, a huge amount of diversity, and can be found throughout the aquatic environment. This type of fish community was not always present in the waters of the world.
“Sepia apama has a bulky body, with 10 appendages (8 short, heavy arms, and 2 larger extensible tentacles)” (Aglibot). These two retractable tentacles are used for catching prey and mating, Sepia apama mate during the Southern Hemisphere winter, June to August. When mating a male's retractable tentacles are extended completely out to make themselves look bigger and they change their color very quickly to attract a mate. They eat crabs, fish, and crustaceans, which are shrimp, lobsters, krill, and barnacles. The retractable tentacles are used to eat these organisms, by grabbing the prey they hold while Sepia apama eats away with its parrot like beak.
Arthropods have mouthparts adapted for piercing vegetation and sucking out plant juices, whereas Molluscs possess a radula that consists of rows of teeth that enables the animal to scrape algae from surfaces of rocks. Lastly, Arthropods and Molluscs both engage in filter-feeding, although not entirely similar. The bivalve molluscs filter-feed fine particles from the water, and similarly, barnacles from Arthropods also filter-feed with their legs. However, according to Bryant (n.d.), Molluscs such as clams and mussels are internal filter feeders because “they bring in water through one opening (the incurrent siphon), pump it through the filter to remove microscopic food particles, and discharge it through another opening (the excurrent siphon)”. In contrast, Arthropods like Barnacles are external filter feeders, in which no water is pumped through the filter.
