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Lab report on isopods
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Introduction Terrestrial isopods are a large group of crustaceans that have adapted for life on land (Post, n.d). Because these isopods breathe through their gills, these gills must stay moist in order for the isopods to continue living (Post, n.d). Therefore, terrestrial isopods prefer to live in damp areas, specifically underneath decaying wood or leaves (Post, n.d). The defenses of these isopods include running, hiding by burying themselves in sight of predators, and their exoskeleton. Isopods found in beach areas can defend themselves by occupying burrows in the sand during the day and rising at night to forage. This tactic works towards their favor, as many types of isopods are nocturnal (Predators & Defenses, n.d). The exoskeleton of isopods also provides a physical barrier against predators. Two terrestrial isopods to be analyzed in this experiment include …show more content…
More specifically, both species favor the soil terrain compared to the sand. As the species were examined, they quickly scurried either under the bark or dug themselves into the soil or sand. The speed of both species is very noticeable, as they hid fairly quickly once our presence was known. Most of the isopods were also found in large, cramped groups. The observations collected supports the hypothesis proposed, as both species acquire a similar behavior in habitat selection, therefore increasing chances of survival when faced with predators. The potential improvements to the experiment include possibly tracking each isopod laid in the boxes, as observance errors could easily occur due to their ability to hide so well with their surroundings. Many of the baby isopods were also extremely small, therefore difficult to notice. Having constant adult sized isopods would further strengthen our
I hypothesized that sowbugs preferred damp soil, to dry, because moisture was the perceived causative agent. I observed that the sowbugs spent more time on the damp soil, rather than the dry soil (Table 1). The sowbugs spent 85% of their observed time on the damp soil side of the experimental chamber (Table 1). These results support my hypothesis, because they suggest that moisture of soil determines where sowbugs will prefer to spend their time (Table 1).
Fox, R. 2001. Invertebrate Anatomy OnLine: Artemia Franciscana. Lander University. http://webs.lander.edu/rsfox/invertebrates/artemia.html, retrieved February 13, 2011.
In the lab the isopods were observed in a way to where behavior and structures could be properly recorded. The isopods were revealed to two dissimilar scenarios, normal temperature water vs. warm temperature water, to calculate which environment was most preferred. In each distinct scenario ten isopods were placed ten a choice chamber, one side being normal temperature (26.7celsius) and the other being warm temperature (43.3 celsius) , and observed for a total of ten minutes with thirty second intervals which was when we recorded our observations. After observations, it was seen that normal conditions was the most preferred environment by the isopods. In the scenario the Isopods exhibited taxis behavior, which is behavior caused by factors such as light, temperature, water and such. Nothing physical, but rather environmental.
I believe that the Semibalanus will inhabit the open area of the rock and out compete the Chthamalus for the open area. I think this because the Semibalanus species seems to be the better competitor of the two.
T. californicus is found from Alaska to Baja in small, shallow tidepools and tidal flats in the upper spray zone where they cannot avoid the full effect of visible and ultraviolet (UV) radiation. Individuals assemble in areas of lower radiation at midday, yet have no preference to the intensity of light at dawn and dusk (Hartline and Macmillan 1995). These tiny arthropods inhabit all types of marine sediments from sand to fine mud and ooze. Along with plankton, T. californicus eats microscopic algae, protists, bacteria, diatoms, algae and microbes (McGroarty 1958). When the concentrations of the species in their habitats are high, T. californicus will turn to cannibalism for a food source. The nautilus eye present in the species is rich with fatty acids and provides a good food source for the animal.
Oxygen breathing lungs are a universal trait of class reptilia. As such, it would have been necessary for the Plesiosauroid - a marine reptile, to return to the ocean surface to inhale air. Oxygen expenditure in reptiles is proportional to strenuosity of locomotion (Frappell, Schultz & Christian, 2002). Therefore the Plesiosauroid must have held physiological traits that enabled the species to avoid oxygen deficit while hunting deep-sea dwelling prey. This essay will outline the hypothesised respiratory, circulatory, pulmonary and sensory attributes of the Plesiosauroid as they relate to diving. These hypotheses will be supported by investigating the physiological adaptations of the Plesiosaur’s biological analogues, and the prospect of similar adaptations in the former will be speculated upon.
The frequency of Patella vulgata has shown to be affected by different microhabitats. An experiment was taken to investigate the difference in limpet frequency at three different microhabitats at the middle shore – Rock pools, Under Rocks and on Top of Rocks. At each microhabitat six sites were investigated and the abiotic factors (temperature, humidity, wind speed and light intensity) were measured. It was found that Under Rocks had the highest frequency of limpets and Rock Pools had the lowest, this was because the limpets where sheltered from direct contact with sunlight and wind, so desiccation was less for limpets found under the rocks whereas in rock pools. The low frequency of limpets found in the rock pools was firstly due to the fact there was poor visibility so could not be sure of actual number of limpets and secondly there was less stable substrate for limpet to attach to in rook pools therefore was a main reason for low frequency of limpets. Consequently, there existed this significant difference between the frequencies of limpets at different microhabitats because of abiotic factors (abiotic components are non-living chemical and physical factors in the environment, such as light intensity, temperature and wind speed) being different.
The next topic for discussion in this paper is ecology. This will include, preferred habitats and interactions with abiotic and biotic elements of the environment.
Copepods are a group of small crustaceans found in the sea and nearly every freshwater habitat. Some species are like plankton (drifting in seawater), some are living on the ocean floor and some particular species may live in still-water habitats and other wet terrestrial places, such as swamps, under leaf fall in wet forests, bogs, springs, ponds, and puddles, damp moss, or phytotelmata of plants.
Encyclopedia of Life, 2014. "Facts about Wood Frog (Lithobates sylvaticus) - Encyclopedia of Life" [online] available: http://eol.org/pages/331212/details [Accessed: 19 Feb 2014].
good source of food. The Trilobites fought back for a time, growing spines during the
The platypus is covered with a thick water-resistant fur, excluding its bill and feet. It’s body it streamlined, has short limbs and webbed forefeet to propel itself through water using an alternative kicking motion. The webs on the for...
Strait, David S. "The Feeding Biomechanics and Dietary Ecology of Australopithecus Africanus." Proceedings of the National Academy of Sciences. 12 Dec. 2008. Web. 19 Nov. 2015. .
Have you ever wanted to slap eight people at once? Or if you're more of a mushy, touchy, feely person, have you ever wanted to hug eight people at once? An octopus can do either or both of these if they want to! So you know an octopus is lucky being able to do this but what's an octopuses habitat? Since they can slap eight things at once do they have predators? Or since we're on the facty facts subject where do they live?
One of the first reason why insects are so successful because they possess a tough exoskeleton that is covered with a waxy water repellant layer. The exoskeleton of insects also has helped them survive. An insect's external skeleton, or exoskeleton, is made of semi-rigid plates and tubes. In insects, these plates are made of a plastic like material called chitin along with a tough protein. A waterproof wax covers the plates and prevents the insect's internal tissues from drying out. Insect exoskeletons are highly effective as a body framework, but they have two drawbacks: they cannot grow once they have formed, and like a suit of armor, they become too heavy to move when they reach a certain size. Insects overcome the first problem by periodically molting their exoskeleton and growing a larger one in its place. Insects have not evolved ways to solve the problem of increasing weight, and this is one of the reasons why insects are relatively small. But compared to animals the Exoskeletons d...