Invasive species are species that humans introduce around the planet that were not in those locations previously. Invasive species:

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Question restatement: Invasive species are species that humans introduce around the planet that were not in those locations previously. Invasive species:

Option 1: 'Out-compete natives for resources or directly destroy other species leading to their local extinction.' This statement captures a core ecological impact of many invasive species: they can be superior competitors for resources such as food, space, or mates, and in some cases directly cause declines or extinctions of native species through predation, disease, or aggressive interactions. This aligns with established observations in invasion biology.

Option 2: 'Lead to reduction of genetic variation of native species, but helps those native species adapt to changes in the environment.' While invasive species can influence native populations, the claim that they reduce genetic variation in natives while helping them adapt to environmental change is misleading. Invasives often threaten natives through displacement or decline, which can reduce genetic diversity through population bottlenecks, not increase it; and the notion that invasives help native adaptation is not a typical or reliable outcome.

Option 3: 'Encourage native species and and typically display character displacement so as not to out-compete native species.' Invasives do not generally encourage native species or promote character displacement to avoid competition; character displacement is typically discussed as a process among closely related resident species that diverge traits due to competition. Invasives frequently increase competition and threaten natives, not foster their coexistence via character displacement.

Option 4: 'Encourage native species and and typically partition resources so as not to out-compete native species.' This option also misrepresents the common dynamics. Invasive species are not typically described as encouraging native species or partitioning resources to prevent competition; they often disrupt existing resource partitioning and amplify competitive pressures on natives, leading to declines.

Overall assessment: The statements about invasive species that best reflect their typical ecological impact are those describing competition with natives and potential direct harm to native species, which is captured in Option 1. The remaining options describe scenarios—genetic benefits to natives, positive encouragement of natives, and guaranteed resource partitioning—that are not consistent with the usual consequences of invasives in many ecosystems.

Biol 1106 Rosenzweig Sp2025 CRN's11552 & 11553 Final Exam Lessons 1-24 - Requires Respondus LockDown Browser

Invasive species are species that humans introduce around the planet that were not in those locations previously. Invasive species:

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Biol 1106 Rosenzweig Sp2025 CRN's11552 & 11553 Final Exam Lessons 1-24 - Requires Respondus LockDown Browser

Invasive species are species that humans introduce around the planet that were not in those locations previously. Invasive species:

View Explanation

Log in for full answers

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