BISC 204 Lecture Notes - Lecture 23: Humboldt Squid, Generalist And Specialist Species, Introduced Species
8 Dec 2016
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Document Summary
Pervasive in new environment (unwelcome influence spreading widely in an area) Invasive species are organisms introduced by humans into places out of their natural range, where they become established and disperse, generating a negative impact on the local ecosystem and/or economy. Exception: humboldt squid expanding range due to climate change. Native species out of control: led to exponential growth of pine beetle populations. The pathway to becoming an invasive species (1) transport to a new area. People bringing exotic pets from a different area (via food or pets) such as a rare species of animal. Ex. ) consider introduction of cane toads into non-native habitats for pest control. Ex. ) stowaways (unintentionally boarding a ship) small and go unnoticed such as spider hiding in bag of bananas (2) establishment (not always successful) Ex. ) birds introduced to new zealand, some failed to established (less success with more release attempts)
