Tras unha breve introducción sobre as invasiones biolóxicas de illas por ratas, a chegada da rata negra ás nosas costas e as características ecológicas da rata negra, Rattus rattus, dase conta da evolución da abundancia da rata negra na illa de Monteagudo dende 1998 ata 2018. Para isto combínanse os resultados das últimas estimas levadas a cabo por eNeBaDa para o PNMTIAG cos resultados doutros traballos previos realizados por 1) o grupo de investigación de Luis Santamaría no marco dun proxecto de investigación sobre os complexos de invasión financiado polo OAPN e 2) o equipo da empresa XESTEC sobre a dinámica anual da rata negra nestas illas.

This study is aimed to evaluate the presence and distribution of Perfluorinated Compounds (PFCs) in Yellowlegged gull eggs (Larus michahellis) collected from 8 National or Natural Parks from the Iberian Peninsula. In each colony, 12 eggs were randomly collected and pooled from 3 areas of the colony and analyzed using liquid– solid extraction and liquid chromatography coupled to tandem mass spectrometry. Perfluorooctanate sulfonate (PFOS) was the only compound detected in the eggs and its presence was higher in the colonies situated in NE Iberian Peninsula due to the more industrial and mass urbanization in this area compared to the SW Mediterranean or Atlantic colonies. Accordingly, the Medes site, followed by the Ebro Delta and Columbretes, all situated in the NW Mediterranean coast, contained the highest PFOS levels (40.5–54.0 ng/g-ww). In all other colonies, PFOS was detected at levels of 10.1–18.6 ng/g-ww. Egg shell biometry was studied and it was found that the presence of PFOS did not affect the development of the egg.

Análise de distribución e abundancia de Rattus norvegicus nas Illas Cíes, fenoloxía de reprodución, variación estacional de dieta, importancia trófica da especie e actividade diaria. O estudo levouse a cabo por medio de trampeos con cepos cun esforzo de mostraxe similar nos oito sectores e catro estacións estudados.

Yellow-legged gulls breed in high density areas, and the condition-dependent hypothesis suggests that birds with high physical condition can obtain breeding benefits in high-density areas because they are able to pay off the energetic costs of aggressive behaviour and territory defence. This study and others showed a relationship between aggressiveness or copulation behaviour and nest-density during the pre-laying period in gulls. The link between density and behaviour can be explained by the strong competition for space and mates. Testosterone regulates mate behaviour and can play an important role in the condition-dependent hypothesis. We tested the effects of testosterone implants on male breeding behaviour. In a high-density colony, testosterone-implanted male yellow-legged gulls showed higher aggression and copulation frequencies than controls during the courtship period. In addition, these testosterone-treated birds acquired larger territories than the controls. Thus, a high testosterone level can increase individual fitness in densely populated areas given the benefits derived, on the one hand, from a large territory and, on the other, from an increased copulation rate that would guarantee the male's paternity of the chicks born in his own nest. Since testosterone increases energetic requirements, Only high-quality males would be able to pay off the costs of high levels of testosterone and so obtain the benefits of breeding in high-density areas. Testosterone could therefore provide a proximate mechanism regulating nest density in gull colonies.

Dentro de las labores de seguimiento de los hábitats naturales que el GI-1934 Territorio – Biodiversidad (IBADER. Campus de Lugo) viene realizando para el Parque Nacional Marítimo-Terrestre de las Islas Atlánticas de Galicia se redacta el presente informe relativo a la llegada del Jacinto de Agua [Eichhornia crassipes (Mart) Solms] a las playas del archipiélago de las Islas Cíes en el Parque Nacional Marítimo-Terrestre das Illas Atlánticas de Galicia, como resultado de un transporte a larga distancia procedente de localidades situadas en el litoral de Portugal.

A paisaxe submarina. Moitas persoas aprecian a paisaxe e valores naturais dos ecosistemas terrestres, pero moi poucas se interesan tamén polos seus equivalentes nos fondos mariños, a pesar de ser accesibles e sumamente atractivos. O snorkel preséntase como a mellor alternativa para superar tan importante barreira. Unha iniciativa nova emprendida no Parque Nacional das Illas Atlánticas podería axudar a planificar e xestionar correctamente esta actividade e crear novas expectativas aos seus visitantes.

Realizouse unha serie de voos cun dron de alta precisión e sensor RGB, e cartografáronse as especies vexetais invasoras detectables a partir do ortomosaico obtido destas imaxes. Posteriormente priorizouse o tratamento dos distintos núcleos de cada especie, en base ó seu tamaño, localización e distancia a outros núcleos, cercanía a pistas transitable pola maquinaria e pendente.

Erodium maritimum L. is an annual species presenting heterogeneous, sometimes very small, and distant populations, distributed along a discontinuous coastal strip of the European Atlantic and the central and western Mediterranean basin. The aim of this study is to investigate genetic variation and geographic structure changes across its large distribution. Fourteen populations of E. maritimum were studied using AFLP fingerprints, together with their population sizes, reproductive systems and flower visitors. AFLP markers revealed the genetic structure of the species to be weak. Many individuals from one population clustered together with those of other populations, showing a high degree of genetic admixture. Despite having a self-compatible reproductive system, populations (especially the largest ones) showed high levels of genetic polymorphism, and the majority of genetic variation was contained within populations. The low genetic structure suggests high levels of gene flow, which might be explained through the dispersability of the species' fruits. Finally, recommendations are provided for management strategies to facilitate the conservation of this endangered species.

O presente informe céntrase na cartografía e estado poboacional das especies de flora vascular ameazada Linaria arenaria DC., Rumex rupestris Le Gall. e Erodium maritimum (L.) L’Her, todas elas catalogadas en traballos como o Libro Rojo de la Flora Vascular Española (Bañares et al., 2003) ou no borrador do Catálogo Galego de Especies Ameazadas (DOGA, 2007). Tamén se comezaron a abordar outros aspectos da bioloxía da conservación destas especies. As especies tratadas foron obxecto dunha mostraxe intensiva no territorio do Parque Nacional das Illas Atlánticas. Presentamos como resultados a cartografía dos núcleos que compoñen as poboacións nos diversos arquipélagos do Parque Nacional. O informe está estructurado en capítulos, un por cada unha das especies tratadas. De cada unha delas aportamos, ademais dunha cartografía detallada, datos dos tamaños poboacionais, hábitat de cada núcleo, problemática ambiental e sinalamos unhas medidas básicas de xestión para o mantemento ou incremento dos efectivos poboacionais de cada núcleo. Para Linaria arenaria sumarizamos os datos dispoñíbeis desde 2002, presentando e analizando a evolución das súas poboacións no territorio do Parque Nacional.

Primera descrición da vexetación e flora das Illas Cíes. Apórtase un inventario de ?? especies.