Long-term changes in avian biomass and functional diversity within disturbed and undisturbed Amazonian rainforest

Luther, David; Cooper, W. Justin; Jirinec, Vitek; Wolfe, Jared D.; Rutt, Cameron L.; Bierregaard, Richard O.; Lovejoy, Thomas Ε.; Stouffer, Philip C.

doi:10.1098/rspb.2022.1123

Cited by 10 publications

(7 citation statements)

References 94 publications

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“…Conservation.-Long-term studies of tropical forest bird communities have demonstrated losses of functional and taxonomic diversity in both disturbed (Palacio et al 2019, Gómez et al 2021, Luther et al 2022) and undisturbed landscapes (Blake & Loiselle 2015), but the forest avifauna we describe appears largely intact, suggesting the area still presents a valuable opportunity for conservation. For example, large-bodied, terrestrial species sensitive to local extirpation from hunting pressure (Peres 2001) including Psophia crepitans, Mitu salvini and Nothocrax urumutum are regularly recorded by camera-traps (Table 1).…”

Section: Red-crested Finch Coryphospingus Cucullatusmentioning

confidence: 77%

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2023

Bulletin of the British Ornithologists’ Club

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The meeting was recorded and a video of the event is available online at https://youtu.be/KU7MPekp41c and also via the Club website https:// boc-online.org.Dr Richard Sales, renowned for his wide-ranging research and publications on raptors, notably British falcons, and Steve Watson, who has been conducting a decades-long field study on the Peregrine Falcon Falco peregrinus in Gloucestershire, jointly presented a very well-illustrated talk entitled The Peregrine Falcon, based on their groundbreaking recent book of the same name. Richard's area of special research interest, namely the interaction between anatomy and behaviour underlying the Peregrine's flight characteristics and prey capture, synergistically complemented the broader focus by Steve on ecology and population characteristics, resulting in a particularly comprehensive overview. Broader discussion of the wide range and complex taxonomy (approaching 20 subspecies according to most authorities) of the species was not neglected, and the authors' detailed research included fascinating novel nuggets of information, including that the Peregrine's visual acuity is likely to be even greater than generally understood.The 1009th meeting of the Club was held in conjunction with the Linnean Society of London at Burlington House, Piccadilly, London W1J 0BF, on Monday 6 November 2023 when Dr Will Smith spoke on Rock Doves and the process of 'extinction by hybridisation'. A detailed account of this meeting will be included in the March 2024 issue of the Bulletin.

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Section: Red-crested Finch Coryphospingus Cucullatusmentioning

confidence: 77%

Full Issue

2023

Bulletin of the British Ornithologists’ Club

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“…2019, Gómez et al . 2021, Luther et al . 2022) and undisturbed landscapes (Blake & Loiselle 2015), but the forest avifauna we describe appears largely intact, suggesting the area still presents a valuable opportunity for conservation.…”

Section: Discussionmentioning

confidence: 99%

The edge of the subtropics: a preliminary list of the birds of San José de Sumaco, Ecuador

Vallely,

Ertl,

Garcia

2023

Bulletin of the British Ornithologists’ Club

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“…Although there can be different responses to species abundance based on fragment size, the BDFFP data indicate that 1‐ and 10‐ha fragments have similarly depauperate understory bird communities after fragment isolation (Stouffer & Bierregaard, 1995). Recent studies that focused on long‐term effects of fragment isolation disturbance on the understory bird community in the BDFFP study area in terms of abundance and community composition (Stouffer et al., 2021) and bird biomass and ecological function (Luther et al., 2022) lumped 1‐ and 10‐ha fragments. Under the ecosystem decay hypothesis, fragment isolation affects the ecological processes of the fragment regardless of its size.…”

Section: Methodsmentioning

confidence: 99%

Effects of forest fragmentation on avian breeding activity

Coddington

Cooper

Luther

2023

Conservation Biology

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Biodiversity declines and ecosystem decay follow forest fragmentation; initially, abundant species may become rare or be extirpated. Underlying mechanisms behind delayed extirpation of certain species following forest fragmentation are unknown. Species declines may be attributed to an inadequate number of breeding adults required to replace the population or decreased juvenile survival rate due to reduced recruitment or increased nest predation pressures. We used 10 years of avian banding data, 5 years before and 4 years after fragment isolation, from the Biological Dynamics of Forest Fragments Project, carried out near Manaus, Brazil, to investigate the breeding activity hypothesis that there is less breeding activity and fewer young after relative to before fragment isolation. We compared the capture rates of active breeding and young birds in 3 forest types (primary forest, fragment before isolation, and fragment after isolation) and the proportion of active breeding and young birds with all birds in each unique fragment type before and after isolation. We grouped all bird species by diet (insectivore or frugivore) and nesting strategy (open cup, cavity, or enclosed) to allow further comparisons among forest types. We found support for the breeding activity hypothesis in insectivorous and frugivorous birds (effect sizes 0.45 and 0.53, respectively) and in birds with open‐cup and enclosed nesting strategies (effect sizes 0.56 and 0.44, respectively) such that on average there were more breeding birds in fragments before isolation relative to after isolation. A larger proportion of birds in the community were actively breeding before fragment isolation (72%) than after fragment isolation (11%). Unexpectedly, there was no significant decrease in the number of young birds after fragment isolation, although sample sizes for young were small (n = 43). This may have been due to sustained immigration of young birds to fragments after isolation. Together, our results provide some of the strongest evidence to date that avian breeding activity decreases in response to fragment isolation, which could be a fundamental mechanism contributing to ecosystem decay.

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Long-term changes in avian biomass and functional diversity within disturbed and undisturbed Amazonian rainforest

Cited by 10 publications

References 94 publications

Full Issue

Full Issue

The edge of the subtropics: a preliminary list of the birds of San José de Sumaco, Ecuador

Effects of forest fragmentation on avian breeding activity

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