People see winter as a cold and gloomy time in nature. The days are short. Snow blankets the ground. Lakes and ponds freeze, and animals scurry to burrows to wait for spring. The rainbow of red, yellow and orange autumn leaves has been blown away by the wind turning trees into black skeletons that stretch bony fingers of branches into the sky. It seems like nature has disappeared.
The objective of this research was to determine the effects of acidification, a change in water pH, on the grass shrimp Palaemonetes pugio. The null hypothesis is that when water temperature, salinity and pH change, the heart rate of the grass shrimp in beats per minute will not change. The dependent variable was heart rate as a measure of metabolic oxygen consumption. The independent variables were salinity, water temperature, pH and the length of each P. pugio.
As I headed to the exhibit where the hamadryas baboons (Papio hamadryas) resided, I knew something interesting would happen over the next few hours. As I walked into the exhibit, I found two mothers pulling their infants' tails to keep them from straying. This particular act reminded me of how some parents put leashes on their children so they won't wander too far. This example demonstrated how similar the behavior of hamadryas baboons and humans can be.
Honeybees (Apis mellifera) play a vital role in U.S. agriculture as pollinators of several crops, including carrots, almonds and apples. Pollination is the result of honeybees' ability to remember foraging sites. This study investigated honeybee memory endurance using the relay landscape learning method. Honeybees (n=1,000, Day 0) were released 0.8 kilometers from the experimental hive in opposite directions, 500 for the relay and 500 for the control. On Days 1, 3, 6 and 9, 40 relay and 40 control honeybees were recaptured, repainted, and re-released 1.8 kilometers from the hive.
"Suddenly, Earth began shaking and quickly got louder by the second." This seventh-grader from New York paints a vivid picture of earthquakes, from how they form to contemporary safety measures.
This discussion reviews how scientists define populations, and in particular, bighorn sheep populations.
This activity exposes students to the causes and consequences of inbreeding in animal and human populations.
This activity extends part 1 by reassigning students to new groups to present the case study completed in part 1, and then to complete the remaining case studies.
Discusses habitats and populations in the context of daily life and bighorn sheep.
Introduce students to the use of road salt to keep roads clear of snow and ice, potential problems with road salt runoff, and to Dr. Sujay Kaushal, the scientist who conducted the study on salt in the Baltimore water supply.