Birds of Peru

Schulenberg, Thomas S.; Stotz, Douglas F.; Lane, Daniel F.; O’Neill, John P.; Parker, Theodore A.

doi:10.1515/9781400834495

Cited by 68 publications

(56 citation statements)

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“…In Ayabaca the only true members of this guild are three members of the genus Grallaria : chestnut-crowned antpitta G. ruficapilla , undulated antpitta G. squamigera and scaled antpitta G. guatemalensis (nomenclature after Schulenberg et al . 2007).…”

Section: Methodsmentioning

confidence: 99%

Terrestrial and understorey insectivorous birds of a Peruvian cloud forest: species richness, abundance, density, territory size and biomass

Kikuchi¹

2009

J. Trop. Ecol.

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Abstract:Terrestrial insectivorous birds in a cloud-forest on the north-western slope of the Peruvian Andes were described in terms of species richness, abundance, density, territory size and biomass. Abundance, density and territory size were also characterized for several understorey insectivores. The three terrestrial insectivore species, all in the genusGrallaria, had 35.25 territories on a 26.2-ha plot, defended territories of (mean ± SD) 1.65 ± 1.34 ha, dwelled at an average density of 4.4 ± 2.7 pairs per 10 ha per species and constituted a biomass of 2470 g per 10 ha. Eight understorey insectivore species had 122.75 territories on the plot, held territories 0.86 ± 0.62 ha in size, and lived at an average density of 5.0 ± 2.7 pairs per 10 ha per species. Six of the 11 species studied each occupied over 50% of the plot. Data on terrestrial insectivores from this study were compared with data from other Neotropical plots to examine how properties of guild structure relate to one another. Increasing densities, smaller territory sizes and higher biomasses appeared to be linked with decreasing species richness and increasing elevation, suggesting consistent patterns of covariance.

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Section: Methodsmentioning

confidence: 99%

Terrestrial and understorey insectivorous birds of a Peruvian cloud forest: species richness, abundance, density, territory size and biomass

Kikuchi¹

2009

J. Trop. Ecol.

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“…Here we report an experimental analysis of multiple amino acid substitutions that occurred during an evolutionary transition in Hb function in South American nightjars (nocturnal birds in the family Caprimulgidae). We focus on one particular species, Tschudi’s nightjar ( Hydropsalis decussata ), a strictly lowland bird that has evolved a reduced Hb-O 2 affinity relative to its highland sister species, the band-winged nightjar ( Hydropsalis longirostris ), which occurs at elevations ranging from ∼2000 m to 4400 m above sea level in the Andes ( Schulenberg et al 2007 ; Benham et al 2011 ). We chose to dissect the molecular basis of this particular transition in protein function because ancestral sequence reconstruction indicated that the evolved reduction in Hb-O 2 affinity in the H .…”

Section: Introductionmentioning

confidence: 99%

Stability-Mediated Epistasis Restricts Accessible Mutational Pathways in the Functional Evolution of Avian Hemoglobin

Kumar

Natarajan

Moriyama

et al. 2017

Molecular Biology and Evolution

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If the fitness effects of amino acid mutations are conditional on genetic background, then mutations can have different effects depending on the sequential order in which they occur during evolutionary transitions in protein function. A key question concerns the fraction of possible mutational pathways connecting alternative functional states that involve transient reductions in fitness. Here we examine the functional effects of multiple amino acid substitutions that contributed to an evolutionary transition in the oxygenation properties of avian hemoglobin (Hb). The set of causative changes included mutations at intradimer interfaces of the Hb tetramer. Replacements at such sites may be especially likely to have epistatic effects on Hb function since residues at intersubunit interfaces are enmeshed in networks of salt bridges and hydrogen bonds between like and unlike subunits; mutational reconfigurations of these atomic contacts can affect allosteric transitions in quaternary structure and the propensity for tetramer–dimer dissociation. We used ancestral protein resurrection in conjunction with a combinatorial protein engineering approach to synthesize genotypes representing the complete set of mutational intermediates in all possible forward pathways that connect functionally distinct ancestral and descendent genotypes. The experiments revealed that 1/2 of all possible forward pathways included mutational intermediates with aberrant functional properties because particular combinations of mutations promoted tetramer–dimer dissociation. The subset of mutational pathways with unstable intermediates may be selectively inaccessible, representing evolutionary roads not taken. The experimental results also demonstrate how epistasis for particular functional properties of proteins may be mediated indirectly by mutational effects on quaternary structural stability.

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“…Sula nebouxii se puede reproducir en cualquier mes del año (Nelson, 1978), por lo que la variación poblacional intra-anual de esta especie en isla Gorgona podría estar más asociada con la fluctuación de la TSM de la región Niño 1+2, que con su ciclo reproductivo. Además, es conocido que la población peruana ha migrado hacia el sur de Perú y norte de Chile durante el fenómeno de El Niño, asociado con la escasez de recursos presa (Cushman, 1926;Schulenberg, Stotz, Lane, O'Neill, & Parker III, 2007), menor acceso a ellas debido a la profundización de la termoclina, o alteraciones en la distribución horizontal y vertical de algunas especies de peces pelágicos (Gilman, Chaloupka, Peschon, & Ellgen, 2016). Se podría asumir que este piquero también migra hacia el norte debido al calentamiento del mar, como ocurrió durante El Niño de 1982-83, en el cual hubo registros de más 7 000 individuos de S. variegata y 10 000 de S. nebouxii en el Golfo de Panamá, (Jaksic & Fariña, 2010) mientras que en islas Galápagos se reportaron pérdidas de nidadas y partida de individuos de S. nebouxii (Jaksic & Fariña, 2010).…”

Section: Discussionunclassified

Variación poblacional de tres especies de piqueros (Suliformes: Sulidae) en isla Gorgona, Pacífico colombiano, según la temperatura del mar

Gamboa¹,

Giraldo²,

Payán³

et al. 2020

RBT

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Introducción: La alteración de la temperatura del ambiente pelágico puede repercutir en la variación poblacional de los consumidores tope como las aves marinas. Objetivo: Evaluar la respuesta poblacional de tres especies de piqueros en isla Gorgona (Pacífico colombiano) con respecto a la variabilidad local y regional de las condiciones de temperatura superficial del mar (TSM). Métodos: Se analizaron las tendencias mensuales de la abundancia de Sula leucogaster, Sula nebouxii y Sula variegata en relación a la variación de la TSM en el área de influencia de Gorgona, la región de San José en la costa del Perú y la región Niño 1+2. Resultados: La mayor correlación positiva se presentó entre S. nebouxii y S. variegata con la TSM de la región Niño 1+2, con un desfase de cuatro y cinco meses, respectivamente. Este desfase temporal posiblemente corresponde al tiempo que demora su migración entre la costa peruana y Gorgona. En contraste, la abundancia de S. leucogaster disminuyó al aumentar la TSM mensual de Gorgona. Conclusiones: Es probable que las tendencias descritas estén relacionadas con la disminución de la productividad y disponibilidad de presas asociadas con temperaturas más cálidas en estas áreas. Se sugiere que la TSM puede influir sobre las tendencias de abundancia de los tres piqueros, y su continuo monitoreo permitirá mejorar el conocimiento sobre la variación natural de estas poblaciones.

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Birds of Peru

Cited by 68 publications

References 0 publications

Terrestrial and understorey insectivorous birds of a Peruvian cloud forest: species richness, abundance, density, territory size and biomass

Terrestrial and understorey insectivorous birds of a Peruvian cloud forest: species richness, abundance, density, territory size and biomass

Stability-Mediated Epistasis Restricts Accessible Mutational Pathways in the Functional Evolution of Avian Hemoglobin

Variación poblacional de tres especies de piqueros (Suliformes: Sulidae) en isla Gorgona, Pacífico colombiano, según la temperatura del mar

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