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My study investigates the effect of soil moisture on Polystichum munitum abundance along a slope gradient. After collecting my data, I realized that my hypothesis was wrong so while my main focus is soil moisture, I will also have to take into consideration how other factors such as slope and canopy cover affect both soil moisture and fern abundance. It’s important to understand that species growth and abundance is dependent on a number of different factors. Some other ecological influences that I might briefly touch on in my paper and that underpin my research are soil pH, soil nutrition, interspecies competition, and disease. Therefore, my study would fall under a form of population ecology that focuses on how both abiotic and biotic factors affect a species or organism.
My keywords are the following: Polystichum munitum, soil moisture, slope gradient
These all sound good, you will be fleshing out these ideas for your intro and discussion.