Body Size, Growth, and Feather Mass of the Endangered Hawaiian Moorhen (Gallinula Chloropus Sandvicensis)

DesRochers, David W.; Silbernagle, Michael D.; Nadig, Aaron; Reed, J. Michael

doi:10.2984/64.2.327

Cited by 7 publications

(1 citation statement)

References 11 publications

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“…El poder determinar la edad de individuos en actividades de monitoreo permite hacer seguimiento a la efectividad de medidas de conservación para la especie como la restauración y creación de humedales artificiales; adicionalmente conociendo la edad de los individuos presentes en un cuerpo de agua se pueden hacer estudios sobre etapas de mortalidad y vulnerabilidad que permitan mejorar la supervivencia. El no poder determinar una edad precisa mediante el aspecto del plumaje también limita el seguimiento de las tasas de crecimiento (DesRochers et al 2010). Adicionalmente, el conocimiento de la crianza de esta especie en cautiverio es de gran valor como una eventual medida de conservación con la suplementación de poblaciones naturales o la reintroducción de la subespecie en localidades con hábitat disponible de donde haya desaparecido.…”

Section: Discussionunclassified

Biología reproductiva de Porphyriops melanops bogotensis (Gruiformes, Rallidae) subespecie endémica y amenazada del norte de los Andes

Castro-Vargas¹,

Rosselli²

2020

Caldasia

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La familia Rallidae, ampliamente distribuida, tiene una alta proporción de especies amenazadas e información limitada sobre su biología reproductiva. La subespecie endémica y amenazada de la tingua moteada, Porphyriops melanops bogotensis, constituye un grupo aislado de Colombia con poca información sobre su reproducción y desarrollo. Describimos la biología reproductiva y el desarrollo de los pollos de P. m. bogotensis, aportando información novedosa y útil para su conservación. El estudio se hizo en la sabana de Bogotá, Colombia entre 2016 y 2019. Semanalmente hicimos recorridos en busca de nidos para su descripción y seguimiento. Se incubaron artificialmente catorce huevos; los polluelos fueron criados en cautiverio, haciendo seguimiento de su crecimiento y cambio de plumaje hasta terminar su desarrollo. Las aves anidaron durante todo el año; el número de huevos varió entre tres y seis, con un período de incubación de 18-20 días. Se alcanzó el tamaño definitivo alrededor de los 55 días, con diferencias significativas entre sexos. El color definitivo del pico se adquiere a los 75 días mientras que el color del iris y plumaje adulto se alcanza entre los días 150 y 165. En términos generales la reproducción y desarrollo de P. m. bogotensis concuerda con lo descrito para otros miembros de la familia Rallidae. Los detalles del cambio en coloración de la subespecie durante su desarrollo permiten determinar la edad de individuos silvestres.

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Section: Discussionunclassified

Biología reproductiva de Porphyriops melanops bogotensis (Gruiformes, Rallidae) subespecie endémica y amenazada del norte de los Andes

Castro-Vargas¹,

Rosselli²

2020

Caldasia

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Comparison of nonlinear models to describe the feather growth and development curve in yellow-feathered chickens

Xie

Pan

Zeng

et al. 2020

Animal

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Feathers play a critical role in thermoregulation and directly influence poultry production. Poor feathering adversely affects living appearance and carcass quality, thus reducing profits. However, producers tend to ignore the importance of feather development and do not know the laws of feather growth and development. The objective of this study was to fit growth curves to describe the growth and development of feathers in yellow-feathered broilers during the embryonic and posthatching periods using different nonlinear functions (Gompertz, logistic and Bertalanffy). Feather mass and length were determined during the embryonic development and posthatching stages to identify which growth model most accurately described the feather growth pattern. The results showed that chick embryos began to grow feathers at approximately embryonic (E) day 10, and the feathers grew rapidly from E13 to E17. There was little change from E17 to the day of hatching (DOH). During the embryonic period, the Gompertz function (Y = 798.48e−203 431exp(−0.87t), Akaike’s information criterion (AIC) = −0.950 × 103, Bayesian information criterion (BIC) = −0.711 × 103 and mean square error (MSE) = 559.308) provided the best fit for the feather growth curve compared with the other two functions. After hatching, feather mass and length changed little from the DOH to day (D) 14, increased rapidly from D21 to D91 and then grew slowly after D91. The first stage of feather molting occurred from 2 to 3 weeks of age when the down feathers were mostly shed and replaced with juvenile feathers, and the second stage occurred at approximately 13 to 15 weeks of age. The three nonlinear functions could overall fit the feather growth curve well, but the Bertalanffy model (Y = 116.88 × (1−0.86e−0.02t)3, AIC = 1.065 × 105, BIC = 1.077 × 105 and MSE = 11.308) showed the highest degree of fit among the models. Therefore, the Gompertz model exhibited the best goodness of fit for the feather growth curve during the embryonic development, while the Bertalanffy model was the most suitable model due to its accurate ability to predict the growth and development of feathers during the growth period, which is an important commercial characteristic of yellow-feathered chickens.

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The island syndrome in birds

Jezierski,

Smith,

Clegg

2023

Journal of Biogeography

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The island syndrome is a widespread biological phenomenon that describes a suite of morphological, behavioural, demographic and life‐history changes associated with island dwelling. These similar evolutionary responses among disparate groups of animals and plants represent a remarkable case of convergent evolution. Among animals, birds are a highly suitable group to study the island syndrome; they are a comparatively data‐rich taxon, are frequent island colonisers, and sometimes display extreme adaptations such as the loss of flight. However, the avian island syndrome literature is fragmented, and multiple components are rarely considered together even though many are inextricably linked. We reviewed multi‐species comparative studies, single‐species or population‐level studies and anecdotal accounts, to summarise and assess the support for individual components of the island syndrome for birds, and to identify suites of traits that should be considered together. The weight of evidence for island syndrome patterns in morphology is substantial, but is more partial or even anecdotal for various aspects of behaviour, life history and physiology. Full validation of the island syndrome in birds will require the less‐studied components to be treated in a comparative framework, and for covarying components to be examined in an integrated way. An improved description of the scope of the syndrome will pave the way to understanding its drivers.

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Body Size, Growth, and Feather Mass of the Endangered Hawaiian Moorhen (Gallinula Chloropus Sandvicensis)

Cited by 7 publications

References 11 publications

Biología reproductiva de <i>Porphyriops melanops bogotensis</i> (Gruiformes, Rallidae) subespecie endémica y amenazada del norte de los Andes

Biología reproductiva de <i>Porphyriops melanops bogotensis</i> (Gruiformes, Rallidae) subespecie endémica y amenazada del norte de los Andes

Comparison of nonlinear models to describe the feather growth and development curve in yellow-feathered chickens

The island syndrome in birds

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