37 research outputs found
The end of primary moult as an indicator of global warming effects in the Red-legged Partridge Alectoris rufa, a medium sized, sedentary species
Global warming affects ecosystem services, communities and populations, influencing the physiology, behaviour or environment of living beings, and hence impacts its survival or breeding. Identifying species susceptibility to warming is relevant in assessing risks to animal populations and ecological processes. The progressive increase in ambient temperature as a result of global warming might have an effect on the timing of primary moult. This could affect a bird’s annual cycle, influencing reproductive success and population dynamics. We describe a method to examine the potential effects of global warming on the primary moult process in a sedentary population of Red-legged Partridges (Alectoris rufa). We organised the factors that might influence the timing of moult end into a network and distinguished between environmental and intrinsic factors. We sorted the
factors according to their contribution to quantitative moult models and constructed a diagrammatic scheme showing their interactions and effect on the end of primary moult over the annual cycle. In Red-legged Partridges, the timing of the end of moult varies according to age-sex class. We found no timing
differences by age, but found significant timing differences by adult sex. More females overlap their moult with juveniles than males because female parental effort is higher, more females incubate and brood chicks. The timing of the end of moult varies by year due to conspecific interactions that change according to influences of the weather, habitat, and social and flock conditions. Parent birds synchronize their primary moult with the chick’s growth, degree of cover and food resources. From the time of hatching to the following year, the date (day-length), social factors (conspecific interactions), and weather (resources) affect the timing of moult and the birds’ annual cycle. Global warming affects the timing of the end of moult and that of the annual cycle. If the extent of the breeding period is shortened, there could be a negative effect on population outcomes. Middle size prey species are key in trophic chains. Our results suggest that the timing of the end of moult could be used as a proxy measure of warming impacts on wildlife and ecosystems and also as a tool for the management of game birds
Seguimiento de una población de perdiz roja silvestre de La Mancha durante 1998-2011: aspectos biométricos, demográficos y fenológicos
S'ha estudiat durant 14 anys la biometria, la demografia i la fenologia d'una població de perdiu roja silvestre d'alta densitat de La Mancha. Primerament s'han determinat les variables biomètriques que resulten més útils per a l'assignació de l'edat i el sexe de la perdiu roja a partir de mostres biològiques de les peces abatudes, a més s'ha avaluat l'associació que existeix entre aquestes variables i les seves variacions anuals i regionals. A continuació, s'ha analitzat detalladament la dinà mica temporal i espacial de l'estructura d'edats i sexes de la població. Posteriorment, s'ha estudiat la cronologia de les dates d'eclosions dels pollets i de la muda postnupcial dels adults, explorant les diferències entre els dos sexes i els diversos anys i à rees d'estudi. Finalment, s'ha examinat la variabilitat de l'abundà ncia postreproductora de la població, determinant en quina mesura estan implicades les variables meteorològiques i poblacionals en els canvis anuals i detectant les variables descriptores de l'hà bitat que millor s'associen amb l'abundà ncia.Se ha estudiado durante 14 años la biometrÃa, la demografÃa y la fenologÃa de una población de perdiz roja silvestre de alta densidad de La Mancha. En primer lugar se han determinado las variables biométricas que resultan más útiles para la asignación de la edad y el sexo de la perdiz roja a partir de muestras biológicas de las piezas capturadas, además se ha evaluado la asociación que existe entre esas variables y sus variaciones anuales y regionales. A continuación, se ha analizado detalladamente la dinámica temporal y espacial de la estructura de edades y sexos de la población. Posteriormente, se ha estudiado la cronologÃa de las fechas de eclosiones de los pollos y de la muda postnupcial de los adultos, explorando las diferencias entre los dos sexos, asà como entre los diversos años y áreas de estudio. Finalmente, se ha examinado la variabilidad de la abundancia postreproductora de la población, determinando en qué medida están implicadas las variables meteorológicas y poblacionales en los cambios anuales y detectando las variables descriptoras del hábitat que mejor se asocian con la abundancia.The biometrics, demography and phenology of a population of wild red-legged partridge high density has been studied in a time frame of 14 years in the area of La Mancha. First, the biometric variables that are most useful for allocation of age and sex of the red-legged partridge were identified using biological samples of hunted individuals; likewise, the association between these variables and their annual and regional variations was also evaluated. Afterwards, the temporal and spatial dynamics of age and sex of the population structure were analyzed together with the chronology of hatching dates and adult post-breeding molt, exploring the differences between sexes, as well as between the several years and areas of study. Finally, the variability of the post-breeding abundance was assessed, determining to what extent weather and population variables are responsible for annual changes, and identifying the habitat descriptive variables better associated with abundance
An integrative approach unveils FOSL1 as an oncogene vulnerability in KRAS-driven lung and pancreatic cancer
KRAS mutated tumours represent a large fraction of human cancers, but the vast majority remains refractory to current clinical therapies. Thus, a deeper understanding of the molecular mechanisms triggered by KRAS oncogene may yield alternative therapeutic strategies. Here we report the identification of a common transcriptional signature across mutant KRAS cancers of distinct tissue origin that includes the transcription factor FOSL1. High FOSL1 expression identifies mutant KRAS lung and pancreatic cancer patients with the worst survival outcome. Furthermore, FOSL1 genetic inhibition is detrimental to both KRAS-driven tumour types. Mechanistically, FOSL1 links the KRAS oncogene to components of the mitotic machinery, a pathway previously postulated to function orthogonally to oncogenic KRAS. FOSL1 targets include AURKA, whose inhibition impairs viability of mutant KRAS cells. Lastly, combination of AURKA and MEK inhibitors induces a deleterious effect on mutant KRAS cells. Our findings unveil KRAS downstream effectors that provide opportunities to treat KRAS-driven cancers
El acceso abierto a la información cientÃfica como lÃnea de investigación en el ámbito de la UNLP
El movimiento internacional de acceso abierto reúne a cientÃficos, profesores, bibliotecarios, editores, estudiantes y público en general que pugnan por lograr que la literatura cientÃfica producida por los académicos con financiamiento del estado esté disponible en lÃnea, de forma gratuita y sin restricciones económicas ni legales. Esta lÃnea de investigación focaliza en el estudio del movimiento de acceso abierto en Argentina.Pósters presentadosDepartamento de BibliotecologÃ
El acceso abierto a la información cientÃfica como lÃnea de investigación en el ámbito de la UNLP
El movimiento internacional de acceso abierto reúne a cientÃficos, profesores, bibliotecarios, editores, estudiantes y público en general que pugnan por lograr que la literatura cientÃfica producida por los académicos con financiamiento del estado esté disponible en lÃnea, de forma gratuita y sin restricciones económicas ni legales. Esta lÃnea de investigación focaliza en el estudio del movimiento de acceso abierto en Argentina.Pósters presentadosDepartamento de BibliotecologÃ