Correlates of extinction risk of birds from two Indonesian islands

Jones, Martin

doi:10.1006/bijl.2001.0525

Cited by 24 publications

(32 citation statements)

References 15 publications

(19 reference statements)

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“…In the mountains, the stable climatic conditions enabled the long-term persistence of montane forest, and bird species living in such an environment have had a lot of time for adaptation to local conditions. Jones et al (2001) suggest that long-term adaptation to local conditions on oceanic islands could lead to high regional specialization and broad local habitat niches. This 'time to adaptation' hypothesis states that a new species that colonizes an island has low abundance and poor local adaptation.…”

Section: Discussionmentioning

confidence: 99%

“…Such adaptation is enabled by the restricted gene pool of the island population, whereas permanent gene flow prevents such a process on the mainland. On the other hand, widely distributed species that have recently colonized an island may have low abundances because they are exposed to an unknown environment already occupied by well adapted local species (Jones et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Unusual abundance–range size relationship in an Afromontane bird community: the effect of geographical isolation?

Reif

Hořák

Sedláček

et al. 2006

Journal of Biogeography

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Aim To show that the frequently reported positive trend in the abundancerange-size relationship does not hold true within a montane bird community of Afrotropical highlands; to test possible explanations of the extraordinary shape of this relationship; and to discuss the influence of island effects on patterns of bird abundance in the Cameroon Mountains.Location Bamenda Highlands, Cameroon, Western Africa.Methods We censused birds during the breeding season in November and December 2003 using a point-count method and mapped habitat structure at these census points. Local habitat requirements of each species detected by point counts were quantified using canonical correspondence analysis, and the size of geographical ranges of species was measured from their distribution maps for sub-Saharan Africa. We tested differences in abundance, niche breadth and niche position between three species groups: endemic bird species of the Cameroon Mountains, non-endemic Afromontane species, and widespread species. ResultsWe detected neither a positive nor negative abundance-range-size relationship in the bird community studied. This pattern was caused by the similar abundance of widespread, endemic and non-endemic montane bird species. Moreover, endemic and non-endemic montane species had broader local niches than widespread species. The widespread species also used more atypical habitats, as indicated by the slightly larger values of their niche positions. Main conclusionsThe relationship detected between abundance and range size does not correspond with that inferred from contemporary macroecological theory. We suggest that island effects are responsible for the observed pattern. Relatively high abundances of montane species are probably caused by their adaptation to local environmental conditions, which was enabled by climatic stability and the isolation of montane forest in the Cameroon Mountains. Such a unique environment provides a less suitable habitat for widespread species. Montane species, which are abundant at present, may also have had large ranges in glacial periods, but their post-glacial distribution may have become restricted after the retreat of the montane forest. On the basis of comparison of our results with studies describing the abundance structure of bird communities in other montane areas in the Afrotropics, we suggest that the detected patterns may be universal throughout Afromontane forests.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unusual abundance–range size relationship in an Afromontane bird community: the effect of geographical isolation?

Reif

Hořák

Sedláček

et al. 2006

Journal of Biogeography

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“…Despite the large number of studies addressing logging, few have focused on which ecological traits are associated with shifts in composition following logging (but see Jones et al 2001). The physical effects of selective logging on tropical rainforests have, however, been well documented (Cannon et al 1994, Johns 1996.…”

Section: Introductionmentioning

confidence: 99%

“…Because of structural habitat changes following logging, concomitant changes are expected in species with traits adapted to climax or disturbed conditions. Primary unlogged forests, for example, are generally characterized by having a welldeveloped canopy and sparse ground cover (Jones et al 2001). It is intuitive then that species largely restricted to canopy or terrestrial strata should exhibit greater sensitivity to logging-induced disturbance.…”

Section: Introductionmentioning

confidence: 99%

Bird Species and Traits Associated With Logged and Unlogged Forest in Borneo

Cleary

Boyle

Setyawati

et al. 2007

Ecological Applications

111

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The ecological consequences of logging have been and remain a focus of considerable debate. In this study, we assessed bird species composition within a logging concession in Central Kalimantan, Indonesian Borneo. Within the study area (approximately 196 km2) a total of 9747 individuals of 177 bird species were recorded. Our goal was to identify associations between species traits and environmental variables. This can help us to understand the causes of disturbance and predict whether species with given traits will persist under changing environmental conditions. Logging, slope position, and a number of habitat structure variables including canopy cover and liana abundance were significantly related to variation in bird composition. In addition to environmental variables, spatial variables also explained a significant amount of variation. However, environmental variables, particularly in relation to logging, were of greater importance in structuring variation in composition. Environmental change following logging appeared to have a pronounced effect on the feeding guild and size class structure but there was little evidence of an effect on restricted range or threatened species although certain threatened species were adversely affected. For example, species such as the terrestrial insectivore Argusianus argus and the hornbill Buceros rhinoceros, both of which are threatened, were rare or absent in recently logged forest. In contrast, undergrowth insectivores such as Orthotomus atrogularis and Trichastoma rostratum were abundant in recently logged forest and rare in unlogged forest. Logging appeared to have the strongest negative effect on hornbills, terrestrial insectivores, and canopy bark-gleaning insectivores while moderately affecting canopy foliage-gleaning insectivores and frugivores, raptors, and large species in general. In contrast, undergrowth insectivores responded positively to logging while most understory guilds showed little pronounced effect. Despite the high species richness of logged forest, logging may still have a negative impact on extant diversity by adversely affecting key ecological guilds. The sensitivity of hornbills in particular to logging disturbance may be expected to alter rainforest dynamics by seriously reducing the effective seed dispersal of associated tree species. However, logged forest represents an increasingly important habitat for most bird species and needs to be protected from further degradation. Biodiversity management within logging concessions should focus on maintaining large areas of unlogged forest and mitigating the adverse effects of logging on sensitive groups of species.

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“…With a few exceptions (Gottelli & Graves, 1990;Thiollay, 1997;Foufopoulos & Ives, 1999;Dennis et al, 2000;Jones et al, 2001), this research has been carried out largely in continuous continental areas. Insular systems offer an additional complication in macroecological studies because the range must be measured on disjoint geographical entities (i.e.…”

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confidence: 99%

Explanations for bird species range size: ecological correlates and phylogenetic effects in the Canary Islands

Carrascal

Seoane

Palomino³

et al. 2008

Journal of Biogeography

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AimTo explore the determinants of island occupancy of 48 terrestrial bird species in an oceanic archipelago, accounting for ecological components while controlling for phylogenetic effects. LocationThe seven main islands of the Canary archipelago. MethodsWe obtained field data on density, habitat breadth and landscape distribution in Tenerife, Fuerteventura and La Palma, trying to sample the whole availability of habitats and the gradient of altitudes. In total 1,715 line transects of 0.5 km were carried out during the breeding season. We also reviewed the literature for data on occupancy, the distance between the Canary Islands and the nearest distribution border in the mainland, body size and endemicity of the 48 terrestrial bird species studied.Phylogenetic eigenvector regression was used to quantify (and to control for) the amount of phylogenetic signal. ResultsThe two measurements of occupancy (number of occupied islands or 10x10 km UTM squares) were tightly correlated and produced very similar results. The occupancy of the terrestrial birds of the Canary Islands during the breeding season had a very low phylogenetic effect. Species with broader habitat breadth, more intense preferences for urban environments, smaller body size, and lower degree of endemicity had a broader geographical distribution in the archipelago, occupying a larger number of different islands and 10x10 UTM squares. Main conclusionsThe habitat generalist species with a tolerance for novel urban environments tend to be present in more islands and to occupy more area, while largesized species that are genetically differentiated within the islands are less widespread.Therefore, some properties of the ranges of these species are explicable from basic biological features. The positive relationship with local abundance, previously uncovered in continental studies, was not found, probably because it relies on free dispersal on continuous landmasses that may be short-circuited in oceanic island scenarios.

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Correlates of extinction risk of birds from two Indonesian islands

Cited by 24 publications

References 15 publications

Unusual abundance–range size relationship in an Afromontane bird community: the effect of geographical isolation?

Unusual abundance–range size relationship in an Afromontane bird community: the effect of geographical isolation?

Bird Species and Traits Associated With Logged and Unlogged Forest in Borneo

Explanations for bird species range size: ecological correlates and phylogenetic effects in the Canary Islands

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