Chasing Bats and Tracking Rats: Urban Ecology, Community Science, and How We Share Our Cities

Chasing Bats and Tracking Rats: Urban Ecology, Community Science, and How We Share Our Cities — page 5
Hypothesis Science is all about asking questions about the way the world works A hypothesis is a well thought out answer to a question we have asked but haven’t yet tested with an experiment or through observation To come up with hypotheses we often need to do research to get enough information to make a statement about what we think will happen Let’s say we want to know if plants grow larger when they have access to sunlight If we did some research we would find out that plants use the sun’s energy to produce their food through photosynthesis Based on this we could hypothesize that if a plant is given no light it won’t grow Experiment Once we have asked a question and come up with a hypothesis we can design an experiment to test it To find out if sunlight makes plants grow we could design an experiment with two plants on a windowsill We could cover one plant with a box so it gets no light and leave the other uncovered Since we are only interested in the effect of sunlight we would want to make sure that nothing else differs between our plants This means we’d have to use the same species of plant give them the same amount of water at the same time and keep them at the same temperature Observation While experiments are an important part of science most of the urban ecologists you’ll meet in this book are trying to make observations about nature in cities but many urban ecologists do experiments too Observation means watching the natural world to understand patterns and see what might change over time With observational science we don’t manipulate or change anything like we would with an experiment For example if we wanted to know the height of the average middle school student living in Fredericton New Brunswick in Canada we couldn’t answer this question by doing an experiment Instead we would need to go out and make some observations about Fredericton’s middle schoolers 4