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New records of cockroaches from caves in Samal Island, Philippines, with notes on the invasive Periplaneta americana (L.) (Blattodea: Blattidae)

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Abstract

During a survey of caves in Samal Island, Philippines, two species of cockroaches were collected, namely: Periplaneta banksi Hanitsch from Baga Cave, and P. americana (L.), from Manan-ao Cave. This is the first record of P. banksi in the southern Philippines and P. americana inside Philippine caves. The role of human disturbance on the invasion by alien species and consequent displacement of local fauna in cave habitats is discussed.

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... Cave-restricted species are generally very narrow endemics, and species occurring in the same cave system generally suffer the same threats (e.g., limestone quarrying in Southeast Asia, [40]; guano harvesting, [41]; introduction of invasive species, [42]), so it is comparatively easy for student assessors to compile Red List assessments for an entire cave system. In addition, assessment work on these species has high impact: given the likely high levels of threat, assessments are an important basis for conservation planning and action. ...
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