Status, density and habitat relationships of the endemic terrestrial birds of Socorro Island, Revillagigedo Islands, Mexico

Rodríguez‐Estrella, Ricardo; Luz, José Luis León de la; Breceda, Aurora; Castellanos, Aradit; Cancino, Jorge; Llinas, Jorge

doi:10.1016/0006-3207(95)00104-2

Cited by 21 publications

(6 citation statements)

References 13 publications

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“…Human alteration of native forest influences the abundance and distribution of birds in a wide variety of environments and spatial scales, from large areas of continents (Robinson et al ., 1995) to large continental islands (Confer & Holmes, 1995) and small, isolated islands (Rodriguez‐Estrella et al ., 1996). The impact of the alteration of native forests and their replacement with exotic vegetation has been particularly severe on oceanic islands, where it has contributed to the decline and extinction of many endemic species (Olson & James, 1982; Steadman, 1995).…”

Section: Discussionmentioning

confidence: 99%

“…Although many studies of Pacific birds have used these methods (e.g. Scott et al ., 1986; Engbring & Ramsey, 1989; Engbring, 1992; Lusk et al ., 1996; Rodriguez‐Estrella et al ., 1996), it was found that distance estimation for different species, some of which are ventriloquial, was not reliable on Tutuila, even for observers with years of experience censusing birds in Samoa. There is no inherent statistical advantage to using a highly derived measure of density rather than recorded abundance to assess habitat relationships, particularly when the densities are derived from the same data on recorded abundance.…”

Section: Methodsmentioning

confidence: 99%

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Habitat relationships of forest birds on Tutuila Island, American Samoa

Freifeld

1999

Journal of Biogeography

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Aim Our knowledge of landbirds on tropical Pacific islands is often comprised of brief, one-time surveys. We know little of species' habitat preferences, and this information is critical for understanding the resource requirements or population status of native species and the impacts of human activity on island birds.Location Tutuila Island, American Samoa. MethodsThe spatial patterns in forest birds were investigated. This island harbours large tracts of native forest, a variety of disturbed and non-native forests, and some relatively healthy bird populations. The distribution of birds was correlated with forest types using habitat data collected at fifty-seven sites and avian census data collected monthly for 1-4 years at these sites. ResultsDifferences in location and in vegetation structure and composition between native and non-native habitats are important influences on the distribution of birds on Tutuila. Among native species, for example, the purple-capped fruit-dove (Ptilinopus porphyraceus Temminck) is dependent upon native habitat, the Samoan starling (Aplonis atrifusca Peale) occurs in all habitats, and the cardinal honeyeater (Myzomela cardinalis Gmelin) is more abundant in low elevation, non-native habitat.Conclusions This research reinforces the importance of quantitative assessment of habitat relationships in the study and conservation of Pacific birds.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Habitat relationships of forest birds on Tutuila Island, American Samoa

Freifeld

1999

Journal of Biogeography

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“…Konecny, 1987;Bamford, 1995), birds (e.g. Fitzgerald, 1988;Rodriguez-Estrella et al, 1996), or mammals (Derenne & Mougin, 1976;Jones, 1977;Pascal, 1980), according to the prey's relative abundance in different seasons and regions.…”

Section: (B ) Effects Of Resource Exploitationmentioning

confidence: 99%

Mammal invaders on islands: impact, control and control impact

Courchamp¹,

Chapuis²,

2003

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The invasion of ecosystems by exotic species is currently viewed as one of the most important sources of biodiversity loss. The largest part of this loss occurs on islands, where indigenous species have often evolved in the absence of strong competition, herbivory, parasitism or predation. As a result, introduced species thrive in those optimal insular ecosystems affecting their plant food, competitors or animal prey. As islands are characterised by a high rate of endemism, the impacted populations often correspond to local subspecies or even unique species. One of the most important taxa concerning biological invasions on islands is mammals. A small number of mammal species is responsible for most of the damage to invaded insular ecosystems : rats, cats, goats, rabbits, pigs and a few others. The effect of alien invasive species may be simple or very complex, especially since a large array of invasive species, mammals and others, can be present simultaneously and interact among themselves as well as with the indigenous species. In most cases, introduced species generally have a strong impact and they often are responsible for the impoverishment of the local flora and fauna. The best response to these effects is almost always to control the alien population, either by regularly reducing their numbers, or better still, by eradicating the population as a whole from the island. Several types of methods are currently used : physical (trapping, shooting), chemical ( poisoning ) and biological (e.g. directed use of diseases ). Each has its own set of advantages and disadvantages, depending on the mammal species targeted. The best strategy is almost always to combine several methods. Whatever the strategy used, its long-term success is critically dependent on solid support from several different areas, including financial support, staff commitment, and public support, to name only a few. In many cases, the elimination of the alien invasive species is followed by a rapid and often spectacular recovery of the impacted local populations. However, in other cases, the removal of the alien is not sufficient for the damaged ecosystem to revert to its former state, and complementary actions, such as species re-introduction, are required. A third situation may be widespread : the sudden removal of the alien species may generate a further disequilibrium, resulting in further or greater damage to the ecosystem. Given the numerous and complex population interactions among island species, it is difficult to predict the outcome of the removal of key species, such as a top predator. This justifies careful pre-control study and preparation prior to initiating the eradication of an alien species, in order to avoid an ecological catastrophe. In addition, long-term monitoring of the post-eradication ecosystem is crucial to assess success and prevent reinvasion.

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“…From a conservation perspective, knowledge on the habitat use of these species is therefore essential. A number of studies have specifically examined habitat use of or effects of deforestation on restricted-range, endemic or threatened species in the Neotropics (Rodriguez-Estrella et al 1996, Garcia et al 1998, Creswell et al 1999, Jacobs and Walker 1999, Welford 2000, Marsden et al 2001, Eisermann and Schulz, 2005 and in other tropical regions (Jones et al 1995, Marsden et al 1997, Fjeldså 1999, Shaw and Shewry 2001, Riley 2002, 2003. Here we examine habitat use of the restricted-range species in the southern Costa Rican part of the Talamanca mountain range.…”

Section: Introductionmentioning

confidence: 99%

Implications of deforestation for the abundance of restricted-range bird species in a Costa Rican cloud-forest

Oostra

Gomes

Nijman

2008

Bird Conservation International

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SummaryCentral America is a region of great avian diversity, and the highlands of Costa Rica and Panama are particularly rich in endemic bird species. Continuing deforestation has destroyed large parts of the birds' natural habitats in this region. The ability of birds to use non-forest habitats will ultimately determine their vulnerability to further deforestation, and knowledge of their habitat use is therefore essential in planning conservation strategies. We examined the effects of deforestation on the abundance of restricted-range bird species in the southern Costa Rican part of the Talamanca mountain range. We used line-transect distance sampling to obtain densities in forest and non-forest habitats. Most (22/28) restricted-range species were recorded in forest and non-forest. Of 28 restricted-range species, 13 species showed a clear preference for forest and 8 for non-forest, and total numbers were one-and-a-half times higher as high in forest compared with non-forest. Of the 10 most common species, one was more abundant in non-forest and seven were more abundant in forest. We conclude that forest is the primary habitat for the majority of the restricted-range avifauna, and their dependence on forest makes them particularly vulnerable to deforestation. Adequate protection of the forests in these mountains is therefore the best assurance of the long-term survival of these birds.

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Status, density and habitat relationships of the endemic terrestrial birds of Socorro Island, Revillagigedo Islands, Mexico

Cited by 21 publications

References 13 publications

Habitat relationships of forest birds on Tutuila Island, American Samoa

Habitat relationships of forest birds on Tutuila Island, American Samoa

Mammal invaders on islands: impact, control and control impact

Implications of deforestation for the abundance of restricted-range bird species in a Costa Rican cloud-forest

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