The marine seaweed limpet Lottia insessa (Hinds) is a habitat specialist on the kelp Egregia menziesii along the northeastern Pacific coast. The geographic range of L. insessa is commonly reported to extend from Alaska to Baja California, Mexico, but the northern distribution of this limpet has been poorly documented. We examined L. insessa specimens from museum collections and surveyed distribution of this species in the field. Results indicate that this species is common in California but is rarely found farther north. Some museum specimens collected from northern localities were misidentified individuals of other limpet species. The northern limit to continuous distribution of persistent L. insessa populations ends at Cape Arago in southern Oregon, a known biogeographic boundary for a variety of marine species. We suggest that individuals occasionally found in the Pacific Northwest and Alaska may have been vagrants that were transported to those locations during anomalous oceanographic events such as El Niño-Southern Oscillations, a phenomenon that has also been observed in other marine organisms. This study clarifies location of the northern range boundary of L. insessa and provides baseline data on its current distributional patterns, which are important for assessing effects of climate change on potential range shifts in the future.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 67 • No. 2