Sunday, February 22, 2015

Rainforests and Yellowstone National Park


The Amazon Rainforests produce about 20% of the entire world’s oxygen. Even though most of us will never use it, it’s still interesting to learn. The amazon rainforest also receives about 9 feet of rain every year. Fifty percent of this returns to the atmosphere through foliage of trees.[1] There are over 40,000 different plant species and approximately 2.5 million insect species in the amazon rain forest. [2]With 10 million different species of plants, animals and insects it’s hard to imagine that the rainforest is endangered. Not just the animals but the entire rainforest. That means that if we keep up with the deforesting, then in 40 years we will lose our rainforests. The sadder thing about that fact is that we the amazon produces around 3,000 different kinds of fruit, and we use 10% of them for our produce. What will we do when we’ve consumed everything the rainforest has to offer? Around 80% of the food we eat originally came from rainforests. Some of the more popular examples include coffee, chocolate, rice, tomatoes, potatoes, bananas, black pepper, pineapples and corn.[3] As you continue on your research on the rainforests, you’ll start to notice that the animals are becoming extinct daily. About 35 species, daily. The diversity of animal types in the Amazon is far reaching. From big to small, cute to strange looking, quiet to noisy, and dangerous to non-threatening all types of animals can be found.[4]

With the rainforest being endangered we have to look at the deforestation. This poses the biggest threat to the rainforest. On the plus side, the rates have slowed in recent years, but not stopped. At the current rate of deforestation, more than half of the 1.4 billion acres of rain forest could be gone by 2030. That’s home to millions of species, the Amazon is on of Earth’s last refuges for jaguars, harpy eagles and pink dolphins. [5]

One of the most, I think, coolest animals to live in the Amazon is the Amazon river dolphin, also known as the pink river dolphin is a freshwater dolphin. This dolphin can weigh up to 352 pounds and grow as long as 9.2 feet. The effect of human gold mining has caused the dolphin to go endangered. They mainly eat catfish, which are bottom feeders greatly affected by metals like mercury in the water.[6] The humans are also catching the catfish for trade in the city. These catfish go for high dollar, and with the catfish being the dolphins primary source of food, it’s easy to see why they’re endangered.

<-------------Freshwater dolphin

Amazon Catfish ---------------->
 

[2] http://www.softschools.com/facts/wonders_of_the_world/amazon_rainforest_facts/98/
[3] http://www.onthegotours.com/blog/2012/11/top-10-facts-about-the-amazon-rainforest/
[4] http://www.tropical-rainforest-facts.com/Amazon-Rainforest-Facts/Amazon-Rainforest-Animal-Facts.shtml
[5] http://www.forbes.com/pictures/fhfi45feek/amazon-rainforest/
[6] http://www.worldwildlife.org/species/amazon-river-dolphin




Part 2 Yellowstone National Park

In the early 1800s during the western expansion, the settlers brought their livestock with them. What they didn’t realize is that the native predator and prey species. Due to agriculture, the wolves’ lost their primary prey. As the prey was removed the wolves’ found stock to be an easier meal choice. Which in turn forced humans to kill the wolves to protect their livestock. Through the early 1900s, predator control, took place. Mountain Lions, Bears, Coyotes, and Wolves were all killed to protect their livestock. In the late 1800s when Yellowstone became a national park, the gray wolf was present. Even then, the early park managers participated in killing off these beautiful creatures. Regardless of the Secretary of the Interior stating “shall provide against the wanton destruction of the fish and game found within the said Park.” This of course all happened before biologists, and the understanding of ecosystems. 1914-1926 at least 136 wolves were killed inside the park. By the mid 1900s, wolf packs were rarely seen. Eventually most were completely eliminated from the 48 states. In 1970 there weren’t any proof that a wolf population existed in Yellowstone, even with the occasional wolf wandering. In 1974 the gray wolf landed on the endangered species list and recovery was mandated. The process began a year later. Between 1995 and 2003 the wolves didn’t prey on livestock outside of Yellowstone as much as anticipated. [1]

 

With that said, we exterminated almost the entire population of wolves from the 48 states and entirely from the Rocky Mountain West, including the part that would become Yellowstone National Park. We thought it was a great idea. Wolves were scary and they would eat our livestock. But then environmental conservation took hold and started to realize that without the wolves killing their natural prey, elk, the willow trees began to shrink until there wasn’t anymore. This affected the habitat of many other animals and plants in negative ways. Thus the ecosystem became unbalanced. The food web became top-down trophic. Once the wolves were restored, the balance was also restored, or so we thought. At Yellowstone, despite the re-introduction of wolves, the willows are not actually recovering as well as was hoped. One reason, Marris found, may be that wolves don’t actually scare elk away from their preferred feeding areas, as earlier research suggested they might. “When elk are really hungry, they’re going to take their chances with the wolves,” Marris says.[2]

 

Based on the above research, it’s easy to see that we will never truly know what would have happened if we just left the wolves alone. We could have built so the wolves didn’t interfere, but these ideas weren’t thought of back then. It was, if someone or something entered your land you make sure they don’t enter EVER again. Kill or be killed was the mentality of the early to mid 1900s. If humans just allowed the ecosystem to manage itself, all probably would’ve been okay, without messing with the habitual balance or lack thereof.

 



[1] http://www.nps.gov/yell/naturescience/wolfrest.htm
[2] http://www.popsci.com/article/science/have-wolves-really-saved-yellowstone
 

Sunday, February 8, 2015

Owl Pellet


 OWL PELLET AND ENERGY PYRAMID LAB Online
 
·       You will need a camera for this lab.
·       Main heading for your post: Owl Pellet and Energy Pyramid Lab
·       Subheadings: Part 1 Owl Pellet Dissection, Part 2 Ecological Pyramids
·       See what to submit under each part. You will only work with one pyramid in Part 2.
 
Objectives
                            
1.       Demonstrate an understanding of the nature of science and the scientific process.                                                                             
2.       Classify animals according to type of skeletal structure.
3.       Identify bones that compose the skeletal system.
4.       Trace the flow of energy through the trophic levels and energy pyramids.
5.       Explain how organisms interact within an ecosystem and how owls affect an ecological community.
6.       Demonstrate analysis of data to produce visual results and written explanations.
7.       Perform calculations to determine patterns.
8.       Demonstrate collaborative skills.
             
Introduction
 
Owl pellets are the undigested remains of prey ingested by an owl. The owl swallows its prey whole, and during the process of digestion, the soft parts of the prey are dissolved and passed on to the intestine for absorption. The hard, non-digestible parts-bones, teeth, fur, feathers, and chitonous remains of insects are compressed in the gizzard and passed on to the proventriculus, the first chamber of the owl’s stomach, where the pellet remains until it is expelled. These pellets are not eliminated as feces, but are regurgitated through the mouth.
 
The Common Barn Owl feeds in early morning and early evening and will usually produce one to two pellets per day.  Glossy black when fresh, the pellet remains smooth and dark in color when dry. Your pellet has been fumigated to eliminate the presence of any insects and then individually wrapped for preservation. Unless otherwise stated, the pellets in this lab are from the family Tytonidae and more specifically, the Common Barn Owl, Tyto alba.
 
View this video to learn more about owls and pellets, http://youtu.be/JdrbSzC6Jcg.
View these slideshows to learn more, http://www.barnowltrust.org.uk/infopage.html?Id=193.
 
Safety
1.      Be careful with sharp tools and bones.
2.      Wash hands after activity.
 
Materials
Owl pellet
Camera
Dissecting surface
Scale
Bone sorting charts
Other small tools, as supplied
Glue
Sheet of plain paper or cardboard for mounting bones
                                                                                                                  
 
Part 1 Owl Pellet Dissection
 
·       What to submit for this part:
o   Table 1 (1 points)
o   Photo of chart with sorted bones (2 points)
o   Photo of reconstructed skeleton (2 points)
o   Table 2 (1 points)
o   Graph of species numbers (2 points)
o   Comments about other species found
 
Procedure
 
1.       Remove the pellet from the aluminum foil.
2.       Measure the length and width of the pellet and record these measurements in Table 1.
 
Table 1. Owl Pellet Measurements
Length
1 5/8”
 
Width
1”

 
 
3.       Place the pellet on the dissecting surface. Carefully separate the bones from fur or feathers onto another part of your surface using your fingers and available tools.
4.       Carefully clean the bones by picking or scraping off debris and sort them according to type—skulls, jaws, vertebrae, etc.
5.       When you are sure that all bones have been separated, dispose of the other materials in the trash.
 
6.       Identify the animals found in your pellet by matching the bones in your pellet with those in the Bone Sorting Chart.
7.       Place each bone beside the matching bone on the Bone Sorting Chart.. You may have many of each type of bone sorted and glued or just a few.
8.       Take a photo of your chart with the sorted bones.
 
9.       Reconstruct a partly complete skeleton of one prey animal. Glue the parts on a sheet of paper  and take a photo.
 I could not figure out how to do the ribs or the pelvis with what I had
 
10.   Record the types and numbers of animals in Table 2.
 
Table 2. Kinds and Number of Animals Found in Owl Pellets
 
No. Voles
No. Shrews
No. Birds
No. Moles
No. Rats
Your Data
 
 
 
 
1
 
11.   Make note of any other species you can identify.
 
I can only make out one type of animal from this owl. The bones collected were that of a rodent, but with the sharp upper and lower front teeth I can only assume a rat.  
 
 
12.   Construct a bar graph of the data in Table 2, using the grid below or another source.





 
 
Part 2 Ecological Pyramids
 
The amount of energy or matter in an ecosystem can be illustrated by a drawing called an ecological pyramid. In this activity you will construct three types of ecological pyramids, a number pyramid, a biomass pyramid, and an energy pyramid.
 
Each pyramid you construct will consist of four trophic levels. The top of each will relate to your owl, the only tertiary consumer (3o). The next level down will relate to the owl’s prey, the secondary consumers (2o). For the purposes of this activity, assume the prey found in the owl pellets are secondary consumers. The next trophic level down will relate to the organisms eaten by the owl’s prey, the primary consumers, (1o). The base of each pyramid will relate to the organisms eaten by the primary consumers, the producers. Use the information obtained from your owl pellet dissection to construct the ecological pyramids below.
 
A.      Energy Pyramid for a Trophic Level.
 
·       Only students with last names starting with Q through Z perform this part.
·       What to submit for this part:
o   Drawing or depiction of your energy pyramid. You may not copy and paste someone else’s pyramid. (5 points)
o   Calculations for number 2 and 3. (2 points)
o   Answer questions 1-5 (5 points)
 
An energy pyramid is an ecological pyramid that indicates the amount of energy in each feeding level. According to the terms of thermodynamics, only about 10% of the energy available within one trophic level is transferred to organisms at the next trophic level. 
 
1.       Assume that the producers in this pyramid (plants) contain a total of 500,000 Calories of food energy. Draw an energy pyramid and label the base with this value.

 
2.       Calculate the amount of energy for the 1˚ consumers by multiplying the food energy of the producers by 0.10. Write this value in your pyramid.
 
3.       Complete your energy pyramid by calculating and labeling the energies for the top two trophic levels. Assuming that the barn owl regurgitates one pellet per day, how many prey items would the owl that produced your pellet consume per year?
 
Based on the owl pellet I had this owl is trying to watch her figure as there is only 1 mammal. If an owl is eating 2 times a night that’s only 370 rodents per year. Which is also the amount of pellets this particular owl produces.
 
Answer these questions.
1.       Where does the pellet remain until it is expelled?
The pellets remain inside the owls stomach until the owl is has digested all the nutrients it needs.
2.       List 6 other birds that are known to regurgitate pellets.
Hawks, Eagles, Falcons, Owls, Kestrels, American Goldfinch, and swallows.
3.       Placing the owl at the highest trophic level, create a food web using the following items:  vole, deer mouse, mole, house mouse, weasel, shrew, snake, starling, frog, salamander, spider, grubs, earthworms, centipedes, crane fly, seeds, plants, roots.

4.       Why does the number of organisms decrease as you move up the pyramid level?
Because there are fewer prey then there are predator. The predators are doing their job to maintain balance and the pray is doing their job to maintain them.
 
5.       We know that about 50% of the energy in an organism is not digested by the consumer and is simply passed through as waste or feces. Is the energy stored in the feces lost to the ecosystem?  Why or why not? No the energy stored in the feces is not lost. The energy, one way or another, gets consumed or is biodegradable to fertilize the plants around it. The insects that feed on the fecal matter also have access to it, then in turn is eaten by a bigger bug or a bat or another insect eating creature and so on.