Ecologists usually specialize in some area of environmental conservation and management or life sciences. Examples include animal behaviour, botany, marine biology, microbiology, population dynamics, soil science, toxicology, and zoology. Often working as part of a multidisciplinary team, ecologists may develop and test hypotheses about:
- Relationships among predators and prey
- Effects on organisms and ecosystems of parasites
- The types and organization of plant communities in the landscape
- The impact of invasive species on native communities
- The effects of human activities (like urbanization, dam construction, oil and gas development, mining, and hunting) on natural habitats and ecosystems (often by monitoring the presence or abundance of target species)
- The management of fish, wildlife, and other biological resources
- The design and management of protected areas
- Evaluation, listing, and recovery plans for species at risk
- The effects of pollutants on terrestrial or aquatic vegetation, wildlife, and ecosystems
- The restoration of functioning ecosystems
- Habitat changes after a natural disturbance, such as fire or flooding
- Fundamental questions about individual behaviour, population dynamics, community structure, or ecosystem function
- Biogeochemical processes, such as the flow of nitrogen, carbon, or energy through an ecosystem
- Populations, communities, and ecosystem function
Duties vary from one position to another. In general, ecologists implement, plan, and conduct or oversee field work. They then report on and interpret the results of that work. This may involve counting populations of plants, animals, and other species or collecting water, soil, plant, or animal samples. Ecologists also:
- Analyze existing data or use the data they collect to understand and classify vegetation and landscapes
- Use computers to enter data, design and manage databases, develop geographic information systems (GIS) layers and products, perform statistical analyses, model problems, and evaluate possible solutions
- Conduct studies to develop or refine ecological land classifications
- Count individuals, populations, species, and communities of organisms
- Study animals over long periods of time, noting characteristics such as population numbers, life history patterns, behaviour, diet, and habitat use
- Study ecosystem attributes over long periods of time, noting characteristics such as species composition, spatial patterns, connectivity of habitats, and patterns of natural and human anthropogenic disturbance
- Study and dissect plant and animal specimens in greenhouses and laboratories
- Do environmental impact assessments
- Write proposals and prepare written reports and recommendations
- Provide information, make presentations, and give talks to individuals, schools, clubs, and interest groups about ecosystem processes and species relationships, and the natural or human impacts on these processes and relationships
- Contribute to developing government policy
- Work with the public, stakeholders, or government to develop and implement conservation strategies
- Use modeling techniques to assess the potential impact of changes to the ecosystem, such as the introduction of new species
Ecologists may also supervise the work of technologists and technicians.