Distance sampling survey and abundance estimation of the critically endangered Grenada Dove (<i>Leptotila wellsi</i>)

Rivera-Milán, Frank F.; Bertuol, Paulo; Simal, Fernando; Rusk, Bonnie L.

doi:10.1650/condor-14-131.1

Cited by 26 publications

(41 citation statements)

References 22 publications

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“…The upper values reflect the assumption that the sex ratio in the population is equal (Bibby et al 2000), but in highly threatened populations females are often much less numerous (Donald 2007), so the dove’s actual population size may be even lower than the 100 and 136 speculated. More recently, however, a distance sampling survey has produced a population estimate of 160 (± 30) based on 33 doves either heard or observed (Rivera-Milán et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Population constraints on the Grenada Dove Leptotila wellsi: preliminary findings and proposals from south-west Grenada

Bolton

Oosterhout

Collar

et al. 2015

Bird Conservation International

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SummaryThe Critically Endangered Grenada Dove Leptotila wellsi has a very small total population size (< 190 individuals) and faces multiple threats. Over eight weeks in 2012 at the Mount Hartman Estate, we investigated the dove’s habitat selection, established a mongoose index of occupancy and recorded dove use of water sources to help determine key research and conservation needs. Of 12 habitat variables measured, greater levels of canopy cover were the best predictor of dove presence. Tracking tunnels indicated that introduced small Indian mongooses Herpestes auropunctatus, widely known for negatively impacting Caribbean bird populations, have a high level of occupancy in dove habitat, providing baseline mongoose data. Trail cameras revealed that Grenada Doves make good use of water from man-made wells and mongooses scent-mark tunnels. We urge fuller habitat selection studies and water-provision experiments to validate this evidence; strong and immediate control of mongooses and other potential predators, particularly at the nest; and a census backed by a banding programme to establish a monitoring baseline to guide conservation actions.

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Section: Introductionmentioning

confidence: 99%

Population constraints on the Grenada Dove Leptotila wellsi: preliminary findings and proposals from south-west Grenada

Bolton

Oosterhout

Collar

et al. 2015

Bird Conservation International

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“…The habitat preference findings of this study are preliminary, and could be improved by a greater quadrat size for habitat measurement and more accurate linkage of point count results to habitat plots; while 60 m association distance has been used in other studies on similar species (Rivera-Milán et al 2015), it adds uncertainty to the results. However, as little is known about this highly threatened species, the findings still have potential importance in directing conservation action.…”

Section: Discussionmentioning

confidence: 92%

“…GPS co-ordinates of all Negros Bleeding-heart sightings from both expeditions were mapped using ArcMap v.10.4 (ESRI 2016) along with the co-ordinates of habitat measurement points. The Negros Bleeding-heart was marked as associated to any habitat data-points within 60 m of a sighting’s co-ordinates, following protocol for the ground-forager dove Leptotila wellsi (Rivera-Milán et al 2015). Four camera traps (Bushnell 12 MP Trophy Low Glow Essential HD Trail Camera) were placed at knee height above the ground from 21 June 2018 – 14 July 2018, and four more were added from 17 July until 6 June 2018.…”

Section: Methodsmentioning

confidence: 99%

“…The remaining 16 did not coincide with another measurement point. All 93 quadrats were associated to any Negros Bleeding-heart sightings recorded within 60 m of them (Rivera-Milán et al 2015), as stated in the bird survey methods. At each quadrat, GPS co-ordinates and an altitude reading were taken using a Garmin GPS unit (Garmin eTrex 30x), because altitude can be a major predictor of occurrence in forest bird species (Bibby 2000; Dallimer and King 2007; Paz et al 2013).…”

Section: Methodsmentioning

confidence: 99%

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Negros Bleeding-heartGallicolumba keayiprefers dense understorey vegetation and dense canopy cover, and species distribution modelling shows little remaining suitable habitat

Mynott

Kerhoas²,

Kerhoas³

2019

Preprint

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1The Philippines is a global biodiversity hotspot, with a large number of Threatened bird species, 2 one of which is the Critically Endangered Negros Bleeding-heart Gallicolumba keayi. The aim of this 3 study was to investigate the habitat preference of the Negros Bleeding-heart and undertake 4 species distribution modelling to locate areas of conservation importance based on identified 5 suitable habitat. A survey of 94 point counts was undertaken and eight camera traps were 6 deployed from May to August 2018 in the Northwest Panay Peninsula Natural Park, Panay, 7Philippines. Habitat variables (canopy cover, understorey cover, ground cover, altitude, presence of 8 rattan and pandan, tree diameter at breast height and branching architecture) were measured in 9 93 5 m-radius quadrats. To identify areas of potentially suitable habitat for the Negros Bleeding-10 heart, species distribution modelling was undertaken in MaxEnt using tree cover and altitude data 11 on Panay and Negros. Using a Generalised Linear Model, Negros Bleeding-heart presence was 12 found to be significantly positively associated with high understorey cover and dense canopy cover. 13Species distribution modelling showed that the Northwest Panay Peninsula Natural Park is 14 currently the most effectively located protected area for Negros Bleeding-heart conservation, while 15 protected areas in Negros require further protection. It is imperative that protection is continued in 16 the Northwest Panay Peninsula Natural Park, and more survey effort is needed to identify other 17 critical Negros Bleeding-heart populations, around which deforestation and hunting ban 18 enforcement is strongly recommended. 19 20

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“…To date, no studies have quantified the influence of point-level vegetation on Honduran Emerald abundance. Several studies in avian ecology have previously demonstrated the utility of habitat-species abundance relationships to highlight the role of vegetation structure and composition for species conservation (Pardini et al 2005, Gómez-Montes andBayly 2010) and to assess the population status of species in a given locality (Sillett et al 2012, Rivera-Milán et al 2015. Therefore, blueprints exist to study how Honduran Emerald local abundance is driven by vegetation characteristics in tropical dry forest remnants.…”

Section: Introductionmentioning

confidence: 99%

Influence of microhabitat on Honduran Emerald (Amazilia luciae) abundance in tropical dry forest remnants

Rodríguez¹,

Escoto²,

Mejía-Ordóñez³

et al. 2019

ACE

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Understanding the ecology of at-risk species is the foundation for developing strategies to counteract continued population declines. The Honduran Emerald (Amazilia luciae) is an endemic hummingbird that inhabits tropical dry forest in Honduras. Remaining populations of this endangered species are restricted to habitat fragments located in landscapes dominated by agricultural activities. The conservation of this species is dependent on efforts to protect existing dry forest remnants and to restore additional areas. However, limited information exists regarding Honduran Emerald habitat use on which to base management decisions. We conducted a study to identify point-level habitat features that are important to Honduran Emerald abundance. In 2014-2015, we conducted avian and vegetation surveys at 174 points located within dry forest remnants. We constructed hierarchical multinomial mixture models using time-removal based point count data collected in three sampling periods. Honduran Emerald detection was influenced negatively by Julian date. Local abundance was positively correlated with shrub-sapling density and cacti structural diversity. Mean local abundance per point was (0.39 ± 0.2 SD) and the number of individuals estimated to have used the combined area of the survey points (48.7 ha) was 68 (CI 95% 45-110). The shrub-sapling density and cacti structural diversity levels identified from our abundance models are characteristic to dry forest communities in this region. As such, the need for efforts to protect remaining dry forest remnants cannot be overstated. Future research should evaluate how the microhabitat features we found to be important to Honduran Emerald abundance influence fitness parameters such as survival and reproduction. Studies that examine how reciprocal effects of pollinator species declines and plant species diversity influences the long-term stability of tropical dry forest ecosystems are also warranted.

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Distance sampling survey and abundance estimation of the critically endangered Grenada Dove (Leptotila wellsi)

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 26 publications

References 22 publications

Population constraints on the Grenada Dove Leptotila wellsi: preliminary findings and proposals from south-west Grenada

Population constraints on the Grenada Dove Leptotila wellsi: preliminary findings and proposals from south-west Grenada

Negros Bleeding-heartGallicolumba keayiprefers dense understorey vegetation and dense canopy cover, and species distribution modelling shows little remaining suitable habitat

Influence of microhabitat on Honduran Emerald (Amazilia luciae) abundance in tropical dry forest remnants

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