Studying the effects of multiple invasive mammals on Cory’s shearwater nest survival

Hervías, S.; Henriques, Ana Catarina; Oliveira, Nuno; Pipa, Tania; Cowen, H.; Ramos, Jaime A.; Nogales, Manuel; Geraldes, Pedro; Silva, C.; Ybáñez, R. Ruiz de; Oppel, Steffen

doi:10.1007/s10530-012-0274-1

Cited by 32 publications

(20 citation statements)

References 65 publications

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“…The Cory's shearwater population on Corvo thus appears to be smaller and nest at a lower density than the breeding populations in the Selvagem archipelago, despite being the largest colony in the Azores (Furness et al 2000). It is possible that the Cory's shearwater population on Corvo may have been much larger in the past (Bolton 2001;Monteiro et al 1996), as introduced cats (Felis catus) and rats (Rattus rattus) continue to affect breeding success of seabirds on many islands in the Azores (Fontaine et al 2011;Hervías et al 2013). The large uncertainty in our abundance estimates is a consequence of error propagation across two different model predictions -the predicted nest density based on recorded calling rate, and the predicted overall abundance extrapolated from the predicted nest density per habitat type.…”

Section: Discussionmentioning

confidence: 99%

“…All potential burrows and rock cavities were inspected with a burrow-scope, and those containing an adult bird or an egg were considered as occupied and monitored for a different project (Hervías et al 2013). The nest density around the nine accessible acoustic recorders was therefore known.…”

Section: Acoustic Recording and Nest Density Assessmentmentioning

confidence: 99%

“…The Azores are estimated to hold a significant proportion of the Cory's shearwater world population, with a breeding population between 49.500 and 89.000 pairs (Monteiro et al 1996). All populations are affected by introduced predators (Fontaine et al 2011;Hervías et al 2013), but for most islands it is unknown whether populations are declining or stable because no quantitative estimates of population size exist. Robust population size estimates are a key knowledge gap for the protection of seabirds in the Azores (Ramírez et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Estimating population size of a nocturnal burrow-nesting seabird using acoustic monitoring and habitat mapping

Oppel¹,

Hervías²,

Oliveira³

et al. 2014

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Estimating population size of a nocturnal burrow-nesting seabird using acoustic monitoring and habitat mapping. Nature Conservation 7: 1-13. doi: 10.3897/natureconservation.7.6890 Abstract Population size assessments for nocturnal burrow-nesting seabirds are logistically challenging because these species are active in colonies only during darkness and often nest on remote islands where manual inspections of breeding burrows are not feasible. Many seabird species are highly vocal, and recent technological innovations now make it possible to record and quantify vocal activity in seabird colonies. Here we test the hypothesis that remotely recorded vocal activity in Cory's shearwater (Calonectris borealis) breeding colonies in the North Atlantic increases with nest density, and combined this relationship with cliff habitat mapping to estimate the population size of Cory's shearwaters on the island of Corvo (Azores). We deployed acoustic recording devices in 9 Cory's shearwater colonies of known size to establish a relationship between vocal activity and local nest density (slope = 1.07, R 2 = 0.86, p < 0.001). We used this relationship to predict the nest density in various cliff habitat types and produced a habitat map of breeding cliffs to extrapolate nest density around the island of Corvo. The mean predicted nest density on Corvo ranged from 6.6 (2.1-16.2) to 27.8 (19.5-36.4) nests/ha. Extrapolation of habitat-specific nest densities across the cliff area of Corvo resulted in an estimate of 6326 Cory's shearwater nests (95% confidence interval: 524). This population size estimate is similar to previous assessments, but is too imprecise to detect moderate changes in population size over time. While estimating absolute population size from acoustic recordings may not be sufficiently precise, the strong positive relationship that we found between local nest density and recorded calling rate indicates that passive acoustic monitoring may be useful to document relative changes in seabird populations over time. RESEARCH ARTICLE Launched to accelerate biodiversity conservation A peer-reviewed open-access journalSteffen Oppel et al. / Nature Conservation 7: 1-13 (2014) 2

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Section: Discussionmentioning

confidence: 99%

Section: Acoustic Recording and Nest Density Assessmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimating population size of a nocturnal burrow-nesting seabird using acoustic monitoring and habitat mapping

Oppel¹,

Hervías²,

Oliveira³

et al. 2014

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“…Most causes of breeding failure are due to predation, cats were responsible for 84% and black rats for 16% of predated nests (Hervías et al, 2013a). Cats and rodents also have an indirect impact influencing the ectoparasite intensity of Cory's shearwaters, which decreases their body condition and breeding success (Hervías et al, 2013b).…”

Section: Ecological Impactsmentioning

confidence: 99%

“…First, Corvo supports important colonies of Manx shearwater, Madeiran storm petrel (Hydrobates castro), Audubon's shearwater (Puffinus lherminieri) and Cory's shearwater (Calonectris borealis), as well as roseate tern and common tern (Sterna hirundo). Secondly, invasive mammals threat seabird populations (Hervías et al, 2013a), and their presence has also a socio-economic impact. Thirdly, the island only possesses two physical points of contact with the exterior (one airport, one harbour), which would greatly simplify the implementation of existing legislation and enhance its results.…”

Section: Introductionmentioning

confidence: 99%

The impact and legislative framework of invasive mammals on Portuguese Macaronesian islands: A case study on Corvo, Azores

Hervías‐Parejo

Royuela

Rodríguez-Luengo

et al. 2015

Environmental Science & Policy

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A trophic cascade facilitates native habitat providers within assemblages of multiple invasive marine species

et al. 2021

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Studying the effects of multiple invasive mammals on Cory’s shearwater nest survival

Cited by 32 publications

References 65 publications

Estimating population size of a nocturnal burrow-nesting seabird using acoustic monitoring and habitat mapping

Estimating population size of a nocturnal burrow-nesting seabird using acoustic monitoring and habitat mapping

The impact and legislative framework of invasive mammals on Portuguese Macaronesian islands: A case study on Corvo, Azores

A trophic cascade facilitates native habitat providers within assemblages of multiple invasive marine species

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