Papers by Ignacio García Peiró, PhD
Revista Catalana d Ornitologia, 2021
International Journal of Zoology and Avian Biology, 2024
Biological synthesis is simply natural selection reduced to the level of genes. It is as if we we... more Biological synthesis is simply natural selection reduced to the level of genes. It is as if we were to reduce all of Darwin's works
to a grain of rice called a gene. The basic insight is reproduce or die.
Revista de anillamiento, 1999
Revista catalana d'ornitologia = Catalan journal of ornithology, 2011
espanolLa razon de sexos de los pajaros adultos puede estar sesgada debido a una mayor mortalidad... more espanolLa razon de sexos de los pajaros adultos puede estar sesgada debido a una mayor mortalidad en las hembras, mientras que en las nidadas esta relacion no suele diferir de la igualdad. Se estudio la razon de sexos en el Bigotudo Panurus biarmicus mediante el analisis de los datos de captura con redes japonesas en el sur de Espana durante un periodo de cinco anos. Se encontro una razon de sexos poblacional a favor de los machos (0,61); la razon de sexos juvenil cercano a la igualdad (0,55), pero la razon de sexos para adultos estaba sesgada hacia los machos (0,67). El sesgo observado en la razon de sexos para los adultos (57–73%) parece ser mayor de lo descrito en la bibliografia (33–65%). Se propone una hipotesis segun la cual habria una mortalidad mas alta de lo normal en las hembras adultas a causa de una mayor depredacion y esto podria explicar este sesgo. Dado que las pequenas poblaciones con oscilaciones en la razon de sexos son mas propensas a la extincion, son necesarios programas de seguimiento y mas estudios encaminados a investigar las posibles consecuencias de estas fluctuaciones en las especies con poblaciones de distribucion muy localizada. EnglishAdult sex-ratios in birds can be male biased due to higher mortality in females, whereas nestling sex-ratios do not normally differ from equality. I studied the sex-ratios in the Bearded Tit Panurus biarmicus by analyzing data from captures with mist-nets in southern Spain over a period of five years. I found that sex-ratios in the population were male-skewed (0.61); juvenile sex-ratios approached equality (0.55), but adult sex-ratios were male-biased (0.67). The observed bias in the adult sex-ratio (57-73%) appears to be greater than the adult avian sex-ratio described in the literature (33-65%). I propose a hypothesis whereby higher-than-normal mortality in adult females due to greater predation could explain such biased sex-ratios. Given that small populations with sex-ratio oscillations may be more prone to extinction, monitoring programs and research to investigate the possible consequences of these fluctuations in patchy populations needs to be carried out. catalaEl quocient sexual dels ocells adults pot estar esbiaixat a causa d’una major mortalitat en les femelles, mentre que en les llocades aquesta relacio no sol diferir de la igualtat. Es va estudiar el quocient sexual en la Mallerenga de bigotis Panurus biarmicus mitjancant l’analisi de les dades de captura amb xarxes japoneses al sud d’Espanya durant un periode de cinc anys. Es va trobar un quocient sexual poblacional a favor dels mascles (0,61); un quocient sexual juvenil proper a la igualtat (0,55), pero el quocient sexual dels adults estava esbiaixat cap als mascles (0,67). El biaix observat en el quocient sexual dels adults (57–73%) sembla ser mes gran del que s’ha descrit a la bibliografia (33–65%). Es proposa una hipotesi segons la qual hi hauria una mortalitat mes alta del normal en les femelles adultes a causa d’una major depredacio i aixo podria explicar aquest biaix. Ates que les petites poblacions amb oscil·lacions en el quocient sexual son mes propenses a l’extincio, son necessaris programes de seguiment i estudis encaminats a investigar les possibles consequencies d’aquestes fluctuacions en les especies amb poblacions de distribucio molt localitzada.
International journal of avian & wildlife biology, Sep 12, 2018
One of the most important direct effects of climate change is the continuous increasing of drough... more One of the most important direct effects of climate change is the continuous increasing of droughts, particularly in arid and semiarid regions. By the use of temporal climatic datasets of fourteen years (1991-2004) and information arisen from ringing captures of small reed passerines it is demonstrated that drought cycles in a wetland of SE Spain, immerse in a semiarid landscape, had not effect on the two small passerines that conform the gross of the reed-bed bird's assemblage, in terms of abundance and biomass. Weak breeding seasons caused by drastic environmental events may have a synergic effect on the different flexibility of the moult strategies and morphological adaptations of well adapted individual body-sizes and hence not affecting them. Finally, novel studies focused on genomic sequence and environmental change in non-model species like birds could offer future prospects to find drought-resistant genes in small individual birds associated to terrestrial aquatic bodies in especially sensitive areas as the semiarid landscapes.
Butlletí del Grup Català d'Anellament, 1991
Oxyura: Revista sobre las zonas húmedas, 2000
Ringing and Migration, May 1, 1997
Etologuía: boletín de la Sociedad Española de Etología, 2006
International journal of avian & wildlife biology, Dec 13, 2018
Human-made wetlands immerse in semiarid lands may be subject matter of hydrological managements, ... more Human-made wetlands immerse in semiarid lands may be subject matter of hydrological managements, which can be susceptible of climatic conditions in territories far of them, as is demonstrated in reservoirs dependent of the agricultural and human demands. Some reservoirs have a sufficient surface of mixed halophytic plants, which provide a critical and endangered small bird's community. In this research, I explore if some management actions involve to the small dominant avifauna in a reservoir established in a semiarid zone of Iberian Peninsula (SE Spain). Results demonstrate that flood inputs, water levels and reed height after management do not influence precisely the abundances of summer warblers visitants as the Reed Warblers Acrocephalus scirpaceus or winter visitants as Chiffchaffs Phylloscopus collybita. Probably water channels input, with agriculture pollutants residuals, can alter the primary trophic chain and could be a primer factor influencing survival of adults and hence affecting the oscillations in the quantity of small passerines. Further investigations are required to check out which are the particular natural or artificial causes that significantly generate changes in the annual abundances of these or other representatives of the bird's assemblage.
International journal of avian & wildlife biology, Dec 23, 2020
The supplementation of different organic sources to diet have become an inherent practice in poul... more The supplementation of different organic sources to diet have become an inherent practice in poultry production to improve the growth and quality of meat. Therefore evaluation of the effects of humic acids (HA) on the final body weight, carcass traits and the changes in selected blood parameters of Japanese quails was the major concern in this study. A total of 72 one day old unsexed Japanese quail chicks from line Pharaoh fed a commercial diet were randomly divided into one control and two experimental groups (n=24) with two replications (12 and 12 per pen), and fattened for 52 days. The dietary treatments consisted of the basal or control diet without supplementation and the diet supplemented with 0.5% and 1.0% of humic acids (HA1 group at 5g•kg-1 and HA2 group at 10g•kg-1) from the 1st day finally to 52 days of fattening in HA1 and HA2 group, respectively. The results showed that quails weight and carcass yields of breast and thigh meat after 52 days of fattening did not show any alterations between monitored groups. The 1% addition of HA had a positive impact on the reduction of blood cholesterol level, which can contribute to the use of HA in the feed for the production of quality meat with low-fat content.
Ecology and evolutionary biology, 2017
The behavioural ecology of the Bearded Reedling Panurus biarmicus in wild using data available fr... more The behavioural ecology of the Bearded Reedling Panurus biarmicus in wild using data available from mistnetting has received little attention. One of such aspects is to evaluate if flock composition and structure vary among reed successional stages and facilities dispersal among near wetlands in small and semi-isolated populations by analysing mistnetting capture events. This study shows that mist-netting events comprised catches of solitary birds or small groups in samples from small to moderate size. Overall mean frequency of each flock result in a population of low aggregation at low densities and being lower than reported from bigger central Spanish populations. A majority of birds of these flocks are "transients", characterized by have shorter wing lengths and smaller body masses compared to "residents", which attain higher body masses and longer wing lengths. Residents have the ability to settle in unmanaged sparse habitats in the periphery of the wetlands and the possibility to undertake longer flights outside wetlands is greater due to a higher condition and performance. Since a high overnight mass loss of birds has been verified in this study, I hypothesize that Bearded Reedlings move in short-times elapsed from sunset (before arriving at the roosts) to sunrise, so earlier surveys carried out in wetlands might give inadequate results to monitoring Bearded Reedling's populations, demanding alternative methods to survey them properly. Due to the occurrence of such residents, the importance of saltmarshes with reed sparse-patches in the periphery of wetlands results in a key factor for the dispersal of this species.
Ringing and Migration, Jun 1, 2013
The movements, sex-ratios, recovery rates and longevity of the Bearded Reedling Panurus biarmicus... more The movements, sex-ratios, recovery rates and longevity of the Bearded Reedling Panurus biarmicus, according to the data obtained from the Spanish Ringing Office from 1975 to 2006, were analysed in this study. It was found that males moved greater distances and had shorter lives than females, and adults moved more and were longer lived than juveniles. Sex-ratios were male skewed and recovery rates were low, suggesting a high mortality in this species.
Ringing and Migration, Aug 1, 1995
Forestry research and engineering: international journal, Dec 1, 2018
International journal of zoology and animal biology, 2022
This article summarizes the situation of the Bearded Tit (Panurus biarmicus) in Iberia on the bas... more This article summarizes the situation of the Bearded Tit (Panurus biarmicus) in Iberia on the basis of the literature found in some Spanish Journals, books and own investigations. This is a species few studied in the centre of Spain, on the bulk of populations are, so furthermore investigations are needed from these areas.
Seven morphological characters were measured in a sample of
1 0 1 birds trapped between June 199... more Seven morphological characters were measured in a sample of
1 0 1 birds trapped between June 199 1 and April 1994. Jhere
were statistically significant differences between sexes in wing
length, tai1 length, bill length, tarsus length and body mass.
Males averaged larger than females. lberian birds seem to be
smaller than those from northern populations.
Ardeola Revista Iberica De Ornitologia, Mar 24, 2003
Intraspecific variation in the wing shape of the long-distance migrant Reed Warbler Acrocephalus... more Intraspecific variation in the wing shape of the long-distance migrant Reed Warbler Acrocephalus scirpaceus: effects of age and distance of migration. The wing morphology of Reed Warblers
Acrocephalus scirpaceus was studied during the breeding and non-breeding cycle in a western Mediterranean area. Wing morphology was first analysed by means of a principal component analysis (PCA) on primary lengths, which corrects for allometric effects on wing shape. Two-way ANOVAs were then used to test for differences in wing morphology according to age, month and their interaction. The PCA produced two components that were related to flight-related traits, namely wing convexity and wing-tip roundness. Primary feather wear was the factor that produced most differences between ages, since adults had a more convex and rounded wing than juveniles at the outermost edge of the wing. Monthly differences in wing shape appear to indicate that differential time of migration among morphologically distinct ages could have accounted for temporal variation in wing shape, pointing that adults increased the wing components during migratory passages while juveniles showed little variation. The existence of a morphological trade-off between costs of manoeuvrability and costs of migration is discussed in order to explain differences in wing shape between ages.
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Papers by Ignacio García Peiró, PhD
to a grain of rice called a gene. The basic insight is reproduce or die.
1 0 1 birds trapped between June 199 1 and April 1994. Jhere
were statistically significant differences between sexes in wing
length, tai1 length, bill length, tarsus length and body mass.
Males averaged larger than females. lberian birds seem to be
smaller than those from northern populations.
Acrocephalus scirpaceus was studied during the breeding and non-breeding cycle in a western Mediterranean area. Wing morphology was first analysed by means of a principal component analysis (PCA) on primary lengths, which corrects for allometric effects on wing shape. Two-way ANOVAs were then used to test for differences in wing morphology according to age, month and their interaction. The PCA produced two components that were related to flight-related traits, namely wing convexity and wing-tip roundness. Primary feather wear was the factor that produced most differences between ages, since adults had a more convex and rounded wing than juveniles at the outermost edge of the wing. Monthly differences in wing shape appear to indicate that differential time of migration among morphologically distinct ages could have accounted for temporal variation in wing shape, pointing that adults increased the wing components during migratory passages while juveniles showed little variation. The existence of a morphological trade-off between costs of manoeuvrability and costs of migration is discussed in order to explain differences in wing shape between ages.
to a grain of rice called a gene. The basic insight is reproduce or die.
1 0 1 birds trapped between June 199 1 and April 1994. Jhere
were statistically significant differences between sexes in wing
length, tai1 length, bill length, tarsus length and body mass.
Males averaged larger than females. lberian birds seem to be
smaller than those from northern populations.
Acrocephalus scirpaceus was studied during the breeding and non-breeding cycle in a western Mediterranean area. Wing morphology was first analysed by means of a principal component analysis (PCA) on primary lengths, which corrects for allometric effects on wing shape. Two-way ANOVAs were then used to test for differences in wing morphology according to age, month and their interaction. The PCA produced two components that were related to flight-related traits, namely wing convexity and wing-tip roundness. Primary feather wear was the factor that produced most differences between ages, since adults had a more convex and rounded wing than juveniles at the outermost edge of the wing. Monthly differences in wing shape appear to indicate that differential time of migration among morphologically distinct ages could have accounted for temporal variation in wing shape, pointing that adults increased the wing components during migratory passages while juveniles showed little variation. The existence of a morphological trade-off between costs of manoeuvrability and costs of migration is discussed in order to explain differences in wing shape between ages.