Search results for "Parasitism"
showing 10 items of 200 documents
Individual learning in the refinement of nest defence responses of the Yellow Warbler (Dendroica petechia)
2006
Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology
2017
Fish parasites may potentially harm fisheries and aquaculture. Infected fish are unusable, even though they would not pose a direct risk to human health. The aim of this thesis was to investigate the ecology and epidemiology of three previously unknown or poorly known spore-forming parasites infecting muscles of economically important fish species. The first novel microsporidian species, here described as Microsporidium luciopercae, was found from pike-perch (Sander lucioperca) and European perch (Perca fluviatilis) and formed opaque-looking patches in the muscles. The second novel microsporidian species, Myosporidium spraguei, was found from pike-perch and burbot (Lota lota) and occurred w…
15M: Análisis de la entropía comunicativa
2012
La irrupción de las redes sociales ha supuesto un incentivo a la comunicación de masas, multiplicando las consecuencias transformadoras del entorno social en aquellos contextos en los que herramientas como Twitter o Facebook suponen un extra a la cohesión ante retos tan importantes como la crisis socioeconómica que azota a occidente. Si bien los primeros síntomas del impacto de las redes sociales a este respecto se pueden apreciar en países como Egipto o Túnez, los cuales forman parte de la corriente conocida como "Primavera Árabe", es el 15M español el primer caso en el que podemos advertir cierto tipo de relación entre la comunicación persuasiva en un soporte físico -la carcelería- y el u…
Reed Warbler Hosts Do Not Fine-Tune Mobbing Defenses During the Breeding Season, Even When Cuckoos Are Rare
2021
Hosts of brood parasitic cuckoos often employ mobbing attacks to defend their nests and, when mobbing is costly, hosts are predicted to adjust their mobbing to match parasitism risk. While evidence exists for fine-tuned plasticity, it remains unclear why mobbing does not track larger seasonal changes in parasitism risk. Here we test a possible explanation from parental investment theory: parents should defend their current brood more intensively as the opportunity to replace it declines (re-nesting potential), and therefore “counteract” any apparent seasonal decline to match parasitism risk. We take advantage of mobbing experiments conducted at two sites where reed warblers (Acrocephalus sc…
The importance of genetic variation to the risk of Hymenoptera parasitism in bag worm moths (Lepidoptera: Psychidae)
2008
Host-related factors affectingisopod (Asellus aquaticus) susceptibility to and interaction with an acanthocephalan (Acanthocephalus lucii) parasite
2013
Los problemas de agencia en las relaciones político-ciudadano dentro del régimen constitucional español contemporáneo
2018
Desde la transición política y con la firma de la constitución española de 1978 se han ido perpetrando ciertos problemas estructurales que han dificultado la representatividad de los ciudadanos así como la confianza en el agente que ha de representarles; de modo que la soberania popular se ha visto secuestrada por la burocracia de partidos que ha pasado a dictar la voluntad del pueblo. En esta investigación se lleva a cabo un repaso de los múltiples escollos que nuestra Carta Magna consagra, y se realiza un análisis de la coherencia interna respecto a la propia Constitución y los valores que en ella se promulgan.
Warming temperatures and ectoparasitic sea lice impair internal organs in juvenile Atlantic salmon
2021
As a consequence of climate change and open net-pen salmon farming, wild Atlantic salmon Salmo salar are increasingly likely to encounter elevated temperatures and parasite abundances during their early marine migration. Such stressors can compromise fitness by diminishing liver energy stores and impairing cardiac muscle. To assess whether temperature and infestation by salmon lice Lepeophtheirus salmonis are important correlates of liver energy stores and cardiac muscle performance in juvenile salmon, we experimentally infested fish at 3 abundances of louse infestation (zero, low, and high) and 5 temperatures (10, 13, 16, 19, and 22°C). At the end of the experiment (i.e. when sea lice reac…
Genome size evolution in macroparasites.
2014
Reduction in genome size has been associated not only with a parasitic lifestyle in intracellular microparasites but also in some macroparasitic insects and nematodes. We collected the available data on genome size for flatworms, annelids, nematodes and arthropods, compared those with available data for the phylogenetically closest free-living taxa and found evidence of smaller genome sizes for parasites in six of nine comparisons. Our results suggest that despite great differences in evolutionary history and life cycles, parasitism as a lifestyle promotes convergent genome size reduction in macroparasites. We discuss factors that could be associated with small genome size in parasites whic…
Factors contributing to the abundance of the ergasilid copepod, Paraergasilus rylovi, in its freshwater molluscan host, Anodonta piscinalis
2004
FM Mari Saarinen on tutkinut väitöskirjassaan Paraergasilus rylovi -äyriäisloisen biologiaa sen isännässä, Anodonta piscinalis -pikkujärvisimpukassa. Työ on perustavaa laatua oleva, sillä tästä loisesta ei lajinkuvauksen lisäksi ole tiedetty aiemmin mitään.Saarisen tutkimuksissa kartoitetaan äyriäisloisen esiintymistä ja loisinnan voimakkuutta eri simpukkalajeilla eri osissa Suomea. Tulokset osoittivat, että loinen on erikoistunut käyttämään pikkujärvisimpukkaa isäntänään ja että loinen esiintyy Suomessa vain maan eteläosissa. Isännän elinympäristöllä ja koolla havaittiin olevan vaikutusta loisen runsauteen; loinen esiintyi järvissä runsaampana kuin virtaavissa vesissä ja infektion intensit…