A key component to bird studies is bird banding, in which each bird has a band with a unique number placed on the bird. Sometimes, larger birds will also have colored bands placed on them which allows the individual to be recognized without recapturing them. This allows changes in populations, dispersal, survival and migratory movements to be studied. Banding birds also gives insight into natural history, particularly, on body conditions during taxing periods of their life cycle like breeding and migration. As part of my undergraduate studies, my class did an activity on bird banding at my professor’s house. Since he is a master bander we were able to sample birds in mist nets.
The study was conducted on November 21st, 2013 at Dr. Beaudry’s house in Alfred, New York from 9:15 am to 11:00 am. Mist nets (which are large thin nets that birds can’t see in flight and therefore fly into and get caught) were set up near feeders and the collected birds had data recorded about their body and they were banded and released. Data collected included age, sex, wing length, weight, and furcular fat score.
In total there were 16 birds captured from 4 species; Black-capped Chickadee (Poecile atricapillus), White-breasted Nuthatch (Sitta carolinensis), American Goldfinch (Carduelis tristis), and Purple Finch (Haemorhous purpureus). The details of each individual are recorded below (table 1).
*disclaimer*This post is based on a paper I wrote for an animal nutrition class, so it’s a bit long.
Parrots are primarily found in the tropics and often are associated with tropical paradise imagery. There are over 350 species in the order Psittaciformes, which are commonly referred to as parrots. This order is divided into 2 families (Koutsos 2001), Cacatuidae and Psittacidae. Cacatuidae contains cockatoos, cockatiels and corellas. Psittacidae contains lores, lorikeets, parrots, macaws, parakeets, rosellas, and love birds. Psittaciformes are some of the most common birds kept in captivity due to their high level of intelligence and distinctive physical form. A large number of zoos have parrot collections, and at large pet store retailers they are available as companion animals. Unlike other birds, they are not used for commercial use of their eggs, meat, or feathers. Therefore only the maintenance values are important in the feed formulation of these birds.
All of these parrots have specialized nutritional needs. As a result, most common cause of vet visits is improper diet (Torregrossa 2005). Therefore this paper will focus on the basic nutritional needs of parrots. Similar to horses, these diets have become adapted to human needs, and thus is not reflective of parrots in the wild. In the wild parrots eat roughly 70 percent seeds (Gilardi 2012) but their diets range from nectarivores to granivores (Matson 2006). Renton (2001) also observed a high flexibility in the diet of wild parrots. Pullianen (1972) found that birds do not select the foods based on their nutritional needs. Because these diets are so varied it is hard to produce a feed that meets the nutritional needs of all parrots.
When beachcombing in the Bahamas I discovered a number of mostly round, about quarter size, water filled, and plastic-like outside objects. I brought one of the odd objects to my professor and he informed me that they were a kind of algae (Ventricaria ventricosa) known commonly as sea pearls (also called bubble algae and sailor’s eyeballs). After recovering from the guilt of poping a whole bunch of sea pearls, thinking they were some kind of trash, I researched more about them. And in case you were wondering, they poped kind of like a water balloon. They were filled with water and not much else. Their cell wall was very plastic like and rubbery. Sadly, they did not resemble a large version of the classic plant cell you learn about in biology class.
On a recent trip to Mississippi, I stopped to look at a freshly killed roadkill snake (I didn’t hit it). It turns out it was a speckled kingsnake (Lampropeltis getula holbrooki). The snake is black with flecks of yellow through and a yellow belly. They can reach up to 132 cm long (51 inches). The one I found looked almost green. They are also called the salt-and-pepper snake for their unique coloration and commonly kept as pets due to their beauty. Apparently, you can buy one online for 60 dollars. However, they often bite and it’s unclear if their populations in the wild are steady. They will also rattle their tail when threatened to mimic a rattlesnake, and spray musk from their scent gland. This musk is actually used to let other snakes in the area know that there is danger.
It’s one of the eight subspecies of the eastern kingsnake (Lampropeltis getula). Kingsnakes are a type of racer snake, and kill their prey via constriction which you would be able to guess if you looked at their heads and how small their jaws are. They are found throughout the united states and even in Baja Mexico. They prefer to live in grassland, swamps, and near streams. They have really varied diets and will even eat other snakes. They have evolved to clamp down on the jaws of other snakes to avoid being bitten by a venomous one but even if they are bitten they are immune to the venom as well. Because they eat and kill venomous snakes people tend to really like kingsnakes and even state they are protecting the neighborhood. Snakes also help to reduce the populations of rodents and other “nuisance” animals.
Interestingly, the Alabama Department of conservation and natural resources says there is a high conservation concern for the snake as the past 30 years have led to rapid declines in populations for unknown reasons. It is suspected that red ant prey on the young and eggs of the snakes and contributed to their decline. Declines are also thought to be related to the logging of hardwood trees in the area. The Mississippi deparmtent of wildlife, fisheries, and parks did not have any information on the snake. Kingsnakes are also eaten by alligators, striped skunks, and possums.
Water privatization, in principle, is great. The idea is that corporations have the financial resources that governments do not to provide the people with clean water. In addition, they can afford the big upfront costs of creating a water system. However, when put into practice privatization fails. A water system requires huge and ongoing infrastructure investments. Corporations have cut corners on these which leads to a shortage of access. Privatization, in fact, has a 34 percent failure rate. Because the system costs so many people often are forced to overpay for their water.
The film Flow documented people in African who could not afford the privatized water. Instead, they drank from the river which resulted in people dying from waterborne illnesses. The companies, when questioned, insisted that the people could afford the water. In addition, the companies also cemented old wells and prevented the local people from using their old, and free methods of accessing clean fresh water. The only upside to privatization is that it is easy to solve; don’t allow privatization to happen. Poor nations will need aid though, to help ensure their people have clean fresh water, but this is part of a continuing effort, as there are many charities focused solely on this issue.
Ocotillo (Fouquieria splendens) is a desert plant that is found in the Sonoran Desert and Chihuahuan Deserts of North America. Although there are other ocotillo species that are found further south. The plant is made up of long thin individual stacks and when it is in bloom those stacks are tipped with a cone of bright red flowers. In fact, they are named for these flowers as ocotillo is Spanish for little torch. This flowering actually is timed to happen when the hummingbirds are migrating through the desert.
I used to teach a genetics lab and thought I would share what I taught my students. Before running polymerase chain reactions (or PCR), to make copies of your sample DNA, it is important to run a gel with your DNA extraction to see if the extraction worked. To run a gel, the DNA sample is loaded into wells on one side of a gel. An electrical current is used to separate out the DNA to analyze it. If your DNA extraction did not work it is a waste of money to run PCR on the sample. This gel is run in buffer TBE. TBE contains tris which raises the pH to 9, a boric acid which lowers the pH to optimizes it for the target enzymes, and EDTA which chelates metal ions and those stops DNeasy activity, which is the enzyme used for DNA extraction. The molecules in the gel separate based on charge, size, and shape. Personally, I like to use 1% agarose gel with TBE at 120 volts for 30 minutes.
But what is agarose? It’s a seaweed polysaccharide that allows the gel to thicken. The more agarose you use the thicker the gel and the longer it will take your DNA sample to run through the gel. If you need to separate out really small fragments you would need a really thick gel but since we are looking to see how well the DNA extraction worked we can use a thin gel. You should also stain the DNA sample before putting the sample in the gel. If you don’t stain the sample you wouldn’t be able to see where your sample goes in the gel and run the risk if running your sample off of the gel. Gels also often have glyercide in them that binds to the DNA and makes it heavier so when you load your DNA into the well on the gel it is less likely that the DNA floats away. It another well a ladder is also typically used. In this case, we used a 1000 kb base pair ladder. A ladder is DNA fragments that are cut at known lengths. This allows it to act as a ruler for your other samples.