Salmonella serovar typhimurium is a bacterium that lives in...

Salmonella serovar typhimurium is a bacterium that lives in the intestines of a wide variety of animals- -including humans, in which it can cause gastroenteritis. In the Unitec States, raw chicken and other poultry are frequent dietary sources of this bacterium and thus present a significant health hazard. Although warning labels now appear on packaged raw poultry, the food industry is testing new ways to reduce the likelihood of contamination by reducing Salmonella populations in chickens before they are slaughtered. In one such test, broiler chicks were given a culture of three species of bacteria: Lactobacillus plantarum, L. acidophilus, and Lactococcus lactis. These birds, along with control birds that had not ingested the cultures, were exposed to Salmonella gut colonization and then tested to see if they maintained populations of Salmonella in their guts. Chicks that had been given bacterial cultures consistently had significantly lower populations of Salmonella than the control group. a. What ecological principle is being applied by the poultry industry? b. What other ecological outcomes might this experiment have produced? c. What other problems might this ecological principle be useful in tackling?

Salmonella serovar typhimurium is a bacterium that lives in the intestines of a wide variety of animals- -including humans, in which it can cause gastroenteritis. In the Unitec States, raw chicken and other poultry are frequent dietary sources of this bacterium and thus present a significant health hazard. Although warning labels now appear on packaged raw poultry, the food industry is testing new ways to reduce the likelihood of contamination by reducing Salmonella populations in chickens before they are slaughtered. In one such test, broiler chicks were given a culture of three species of bacteria: Lactobacillus plantarum, L. acidophilus, and Lactococcus lactis. These birds, along with control birds that had not ingested the cultures, were exposed to Salmonella gut colonization and then tested to see if they maintained populations of Salmonella in their guts. Chicks that had been given bacterial cultures consistently had significantly lower populations of Salmonella than the control group.
a. What ecological principle is being applied by the poultry industry?
b. What other ecological outcomes might this experiment have produced?
c. What other problems might this ecological principle be useful in tackling?

Key Concepts

Competitive Exclusion Principle

This principle states that two species competing for the same limited resources cannot coexist indefinitely; one species will eventually outcompete the other. In broader ecology, it explains how an established community can resist invasions by occupying available niches and utilizing resources more effectively than a new, invading species.

Colonization Resistance

This concept refers to the ability of an established microbial community to resist invasion by new, potentially harmful microbes. It is crucial in understanding how existing communities maintain stability and prevent the establishment of pathogens by occupying available niches and sometimes producing inhibitory substances.

Biological Control

Biological control involves using living organisms, such as beneficial microbes, to suppress or eliminate harmful species. This ecological approach leverages natural relationships within ecosystems to manage pests or pathogens, reducing reliance on chemical interventions and promoting sustainable practices.

Transcript

00:02 Hi, in this video, we're going to look at the idea of competition, ecological competition.

00:10 There's an example in the book, life, the science of biology, 10th edition.

00:14 There's an example where they talk about salmonella, the bacteria that causes the type of food poisoning that you're probably familiar with.

00:26 And so, and we know that salmonella is associated with poultry quite often.

00:35 And so there have been some experiments on chicken to try and reduce the quantity of salmonella that shows up in processed food.

00:51 And in this particular experiment that they talked about, they took a control group that they gave no treatment to.

01:01 And they took an experimental group.

01:04 And to the experimental group, they inoculated or actually caused these chickens to ingest three different types of non -harmful bacteria.

01:17 So those are over here on the right.

01:20 So the chickens that ingested the non -harmful bacteria ended up having a lower quantity of salmonella in their digestive tracts, which means, obviously, they couldn't pass that on during the processing and it couldn't get on the meat.

01:40 And so that chicken was safer for human consumption.

01:44 So what's going on here is the idea of exploitation competition, that within the gut tract of the chicken, salmonella could not survive well because there was competition from these three other types of bacteria that are all, they're all trying to get the food that's going through the chick's digestive system...

Please give Ace some feedback