Search results for "diversity"
showing 10 items of 3950 documents
Biologiczny monitoring ekosystemów wodnych. Zalety i ograniczenia współczesnych metod
2003
El biohuerto escolar como recurso en la educación intercultural
2013
La presente investigación analiza las posibilidades que ofrece el taller de biohuerto escolar como recurso en la educación intercultural por su capacidad para establecer nexos culturales entre dos contextos diferentes a través del conocimiento sobre las verduras y hortalizas. La práctica educativa se realizó en un colegio en Valencia que previamente había mantenido contactos interculturales con una comunidad nativa en la Amazonía peruana. Se siguió una metodología por objetivos a través de un programa de intervención constituido por actividades que abarcaban las diferentes áreas de conocimiento. A través de la asamblea, del análisis de tareas, de las encuestas y de las pruebas se pudo valor…
Tempo and mode of early gene loss in endosymbiotic bacteria from insects
2006
Abstract Background Understanding evolutionary processes that drive genome reduction requires determining the tempo (rate) and the mode (size and types of deletions) of gene losses. In this study, we analysed five endosymbiotic genome sequences of the gamma-proteobacteria (three different Buchnera aphidicola strains, Wigglesworthia glossinidia, Blochmannia floridanus) to test if gene loss could be driven by the selective importance of genes. We used a parsimony method to reconstruct a minimal ancestral genome of insect endosymbionts and quantified gene loss along the branches of the phylogenetic tree. To evaluate the selective or functional importance of genes, we used a parameter that meas…
Distinct bhaplotype structure at the innate immune receptor Toll-like receptor 2 across bank vole populations and lineages in Europe
2015
Abstract: Parasite-mediated selection may contribute to the maintenance of genetic variation at host immune genes over long time scales. To date, the best evidence for the long-term maintenance of immunogenetic variation in natural populations comes from studies on the major histocompatibility complex (MHC) genes, whereas evidence for such processes from other immune genes remains scarce. In the present study, we show that, despite pronounced population differentiation and the occurrence of numerous private alleles within populations, the innate immune gene Toll-like receptor 2 (TLR2) displays a distinct haplotype structure in 21 bank vole (Myodes glareolus) populations across Europe. Haplo…
Edaphyc characteristics and floristic composition of the seasonally dry forest la menta and timbes, Piura Region, Peru
2011
Con el objetivo de contribuir al conocimiento de los ecosistemas naturales del país, se determinó las características edáficas y la composición florística del bosque estacionalmente seco (La Menta, 04º 43' 55" LS y 80º 04' 55" LO, provincia de Piura y Timbes, 04º 44' 58" LS y 80º 03' 33" LO, provincia de Ayabaca), ambos en la región Piura, Perú. El área de estudio abarcó una extensión aproximada de 6 000 hectáreas en un rango altitudinal entre 350 m a 1 350 m. En cada bosque se muestrearon 5 transectos de 10 x 50 m a intervalos de 20 m, sumando un total de 2 500 m². El análisis de suelo reveló niveles bajos de materia orgánica, nitrógeno y potasio y medios de fósforo asimilable. Estos suelo…
Shaping the antipredator strategy: flexibility, consistency, and behavioral correlations under varying predation threat
2014
9 pages; International audience; Recent ecological and evolutionary research emphasizes the importance of adaptive trait integration. For instance, antipredator defenses are built up of several morphological and behavioral components in many species, yet their functional relationships are still poorly documented. Using field-collected freshwater crustaceans Gammarus fossarum in a within-subject design, we investigated the flexibility and consistency of refuge use, photophobia, and exploration behavior as well as their associations, quantified both when predation risk was absent or artificially simulated. In agreement with the "threat-sensitivity" hypothesis, both refuge use and photophobia …
Assessing the Impact of Road and Land Use on Species Diversity of Trees, Shrubs, Herbs and Grasses in the Mountain Landscape in Southern Africa
2022
Mountain landscape, described as a global biodiversity hotspot due to high endemism, is threatened by land-use change, including management and modification of vegetation. However, there is little knowledge about how road and land use affect plant diversity in mountains landscapes, particularly in southern Africa. Previous studies have studied the impact of the road or land use on plant species diversity separately and have concentrated on a single plant species. Here we compare the plant diversity of regenerated trees, shrubs, herbaceous plant, and grasses among Forest, Fallow, Agriculture, and Road in the Moribane Forest Reserve (MFR), in Eastern Chimanimani Mountain landscape in Mozambiq…
Nabrzeżkowate (Heteroptera: Saldidae) Polski – przegląd faunistyczny / Shore bugs (Heteroptera: Saldidae) of Poland – a faunistic review
2022
This paper is a faunistic review of 23 species of the family Saldidae occurring in Poland. The study was based on the original papers relating to the territory of Poland and on materials deposited in several institutions, i.e. University of Opole (UO), Museum and Institute of Zoology, Polish Academy of Sciences, Warsaw (ZMPA), and in Nature Collections of the Faculty of Biology of Adam Mickiewicz University in Poznań (ZPUAM). Over 4000 specimens preserved at the institutions mentioned above have been examined, identified, or their previous identifications were verified. All the localities (with their UTM coordinates) for each of the 23 species occurring in Poland are listed in alphabetical …
Damsel bugs (Hemiptera:Heteroptera: Nabidae) of Poland: identification key, distribution and bionomy
2020
Rodzina Nabidae (zażartkowate) w Polsce reprezentowana jest 15 gatunków należących do dwóch podrodzin: Prostemmatinae i Nabinae. Pierwsza z nich obejmuje dwa gatunki należące do rodzaju Prostemma, Nabinae są reprezentowane przez 13 gatunków sklasyfikowanych w dwóch rodzajach: Himacerus i Nabis. Niniejsza praca podsumowuje rozmieszczenie zażartkowatych w Polsce na podstawie danych literaturowych oraz niepublikowanych. Zaprezentowano mapy rozmieszczenia każdego gatunku w Polsce i w Palearktyce. Ponadto przedstawiono dwujęzyczny klucz do identyfikacji zilustrowany wysokiej jakości fotografiami. Omówiono bionomię każdego gatunku. Analiza rozmieszczenia Nabidae w Polsce wskazuje na stosunkowo do…
Innovative and Applied Research in Biology: Proceedings, Vol.1
2019
Projekti: ZD2016/AZ81 & ZD2016/AZ107