Daphnia Magna Feeding Rate

Daphnia Magna are small crustaceans that are excellent for observing the effect of depressants on their nervous system. The purpose of this specific experiment is to observe the effect of ethanol, aspirin, and caffeine on daphnia’s heart rate. Not only do these chemicals affect heart rate, but they also affect the frequency of reproduction, number of eggs produced, and body structure. Pesticides similar to these chemicals can be released into the environment and daphnia re useful in monitoring toxicity levels. The agents being tested in this experiment can be administered to determine the effects of hormones, stimulants, antidepressants, and neurotransmitters.

This behavior was observed in all the three experiments and through the period of observation, isopods seemed to move to different sponges before they settled down behind one of them. The χ2 value was 0.03842932, df was 3 and hence the P value was less than 0.001 which proves that this result is not a result of random probability and is in fact significant and reliable. In Trial 2, the hypothesis was that most isopods would go to the sponge with sucrose solution and our hypothesis was proved correct through the experiment. It was observed that a majority (55%) of the isopods preferred sucrose relative to the other sources of moisture.

This indicates that we are unable to show a statistical difference between Isopods preferring the syrup environment over the water environment. Introduction:

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.

Title- The Effect of pH Balance on Isopod Behaviour Introduction- Isopods, or what your 7-year old self would refer to them as ‘Roly-Polys’, are actually a type of class crustacean. They breathe with gills, so they have to stay in damp areas with high humidity. That’s why you normally find them under rocks (Isopod, Pillbug, Sow Bug Information, 1997).

72580 Rodriguez Silva The Top-down Effects of Brine Shrimp on Algae INTRODUCTION An ecosystem is a delicate structure moderated by the network of interactions between all of the organisms that inhabit it. These organisms can be arranged into trophic levels, forming a chain or pyramid in which energy flows from one level to another.

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.

“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.

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.

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.)

Introduction Metabolism is the sum of all anabolic and catabolic reactions within a living organism to sustain life. The energy required to perform these reactions is provided by oxygen in the form of ATP, therefore the oxygen consumption rate can be measured to determine the metabolic rate. Since oxygen is obtained through respiration, the efficiency of an organism’s respiratory system affects its metabolism. Previous studies have shown that caffeine affects the human respiratory center and occasionally dilates bronchus. It can thus stimulate human respiration and increase the metabolic rate (Haggins et al, 1915).

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.

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).

When one thinks of a veterinarian, most associate this job title with treating dogs, cats, horses, cows, and other farm and companion animals. However, a relatively small field not known by the general population is that of marine veterinary medicine. If one has a passion for the water and a desire to help the creatures in it, marine veterinary medicine just may be the perfect career. Marine veterinarians are responsible for “conducting basic exams and evaluations, giving vaccinations, taking samples of blood and other bodily fluids, prescribing and distributing medication, evaluating behaviour, performing surgical procedures, and taking x-rays and sonograms” (Kramer “Life of an Aquatic Veterinarian”).

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.