Direct impact of typhoons on the breeding activity of Bullheaded Shrike Lanius bucephalus on Minami-Daito Island

SummaryThe introduction of exotic rats Rattus spp. is one of the most important factors contributing to the reduction in avian diversity and extinctions on oceanic islands. However, little is known about factors other than predation, which are associated with the loss of island biodiversity. We report that introduced Ship Rats Rattus rattus constructed arboreal dome-shaped nests and secondarily used open-cup nests of the Bull-headed Shrike Lanius bucephalus for roosting or rearing young in trees within hedgerows along sugarcane fields of Minami-daito Island (northwest Pacific). We found that temporal nest utilization by Ship Rats forced Bull-headed Shrikes to abandon their nests before egg-laying. We suggest that kleptoparasitism applies to the interaction between Bull-headed Shrikes and Ship Rats, which usurp shrike nests during their breeding period. It is necessary to consider the potential effects of introduced Ship Rats on insular avian communities not only through predation but also through interspecific interaction over nest-sites.

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Arboreal nesting and utilization of open-cup bird nests by introduced Ship Rats Rattus rattus on an oceanic island

Matsui

Hisaka

Takagi

2009

Bird Conservation International

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Predation risk of eggs and nestlings relative to nest‐site characteristics of the Bull‐headed Shrike Lanius bucephalus

Matsui

Takagi

2012

Ibis

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Appropriate nest‐site selection is one of the most important ways to minimize loss of reproductive investment due to predation. We determined the environmental characteristics associated with nest predation during the incubation and nestling periods of arboreal nesting Bull‐headed Shrikes on the oceanic Minami‐Daito Island where the predator community has low species diversity and includes only three introduced mammals: Ship Rat Rattus rattus, Japanese Weasel Mustela itatsi and Feral Cat Felis catus. Egg predation declined with increasing grassland cover around nests, whereas nestling predation declined with increasing nest concealment and nest height. Our results suggest that effective nest‐site characteristics for avoiding nest predation differ during the incubation and nestling periods and are dependent on the predator species and their search strategies, at least in habitats with low predator species diversity.

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Harmful Effects of Invasive Yellow Crazy AntAnoplolepis gracilipeson Three Land Bird Species of Minami-Daito Island

Matsui

Kikuchi

Akatani

et al. 2009

Ornithological Science

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Direct impact of typhoons on the breeding activity of Bullheaded Shrike Lanius bucephalus on Minami-Daito Island

Cited by 4 publications

References 9 publications

Arboreal nesting and utilization of open-cup bird nests by introduced Ship Rats Rattus rattus on an oceanic island

Arboreal nesting and utilization of open-cup bird nests by introduced Ship Rats Rattus rattus on an oceanic island

Predation risk of eggs and nestlings relative to nest‐site characteristics of the Bull‐headed Shrike Lanius bucephalus

Harmful Effects of Invasive Yellow Crazy AntAnoplolepis gracilipeson Three Land Bird Species of Minami-Daito Island

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