Environmental signals are indicators in nature that provide information about the health and status of ecosystems. These signals can include changes in temperature, precipitation patterns, or the presence of certain species. For example, the migration patterns of birds can signal shifts in climate or habitat conditions. Scientists often study these signals to understand how ecosystems respond to changes, such as pollution or climate change. By monitoring environmental signals, researchers can predict potential impacts on biodiversity and ecosystem services, helping to inform conservation efforts and policy decisions.