Searching in a library catalog requires looking for broader topics such as ecological genetics or marine conservation rather than the more specific metapopulation gene flow or sea otter biodiversity.
LIBRARY OF CONGRESS CLASSIFICATION OUTLINE
CLASS Q - SCIENCE
Ecology literature is located mainly in selected Q life sciences areas:
QH subclass Natural History
QK subclass Botany
QL subclass Zoology
Please note that Oceanography resources are located in the GC subclass area; and any Agricultural resources are found in the S class area.