River otters are indicator species, meaning that their presence, absence, or changes in population health acts as a direct reflection of the ecosystem’s overall condition (similarly to diamondback terrapins). In the case, the presence of river otters are a sign of great water quality! Freshwater ecosystem health is of particular concern to us humans because of our heavy reliance on clean water. Since 2008, river otters have been spotted more and more frequently across the Long Island area, especially in the Peconic Estuary.
River otters (Lontra canadensis) inhabited most freshwater systems in the United States in the early 1800s. Afterwards, the population fell drastically due to excessive hunting and increased industrialization destroying their habitat. As a result, conservation management policies were implemented in the 1900s to help the population completely rebound and recolonize on Long Island.
In partnership with Seatuck Environmental Association, PEP conducted monitoring of river otters in 2023. From this work, researchers were able to find evidence of otter presence around the estuary. This work provided an opportunity to perform a more thorough latrine survey of the Peconic Estuary watershed than the previous surveys done throughout Long Island in 2008 and 2018. Absence – presence surveys involving a single visit to sites over the survey period cannot rule out the possibility that the sign noted is that of a dispersing yearling seeking a home range as opposed to evidence of an established otter home range. PEP has committed to continue the river otter monitoring surveys every five years.
