1,721,014 research outputs found
Rinvenimento della specie aliena invasiva Procambarus clarkii (Astacidea: Cambaridae) nella Riserva Naturale ¿Bosco Siro Negri¿ (Zerbolò ¿ Pavia)
No full textProcambarus clarkii o gambero rosso della Louisiana
No full textLa Terra è un pianeta in continuo movimento e con essa tutte le forme di vita esistenti. In questo libro è racchiuso il concetto di ecobioevoluzione che comprende i tre aspetti fondamentali della vita sulla Terra, ovvero l’ecologia, la biologia e l’evoluzione. Ecobioevoluzione rappresenta la visione olistica, mediante lo studio, la ricerca e l’analisi, dei complessi fenomeni che avvengono negli ecosistemi. Fenomeni di origine sia naturale che artificiale le cui conseguenze e relazioni sono interdipendenti e in continuo divenire
Analisi del contenuto stomacale di Procambarus clarkii (Girard 1852), gambero invasivo nella riserva naturale “Borsco S. Negri” (Zerbolò, PV)
No full textBad Moon Rising: il gambero rosso della Louisiana, una minaccia per gli ecosistemi della Lombardia
No full text
Bioinvasions as a component of global change in stressed marine ecosystem
No full textBiological invasions in marine environment are the lesser known aspect of global change. However, recent events which occurred
in the Mediterranean Sea demonstrate that they represent a serious ecological and economical menace leading to biodiversity loss,
ecosystem unbalancing, fishery and tourism impairment. In this paper we review marine bioinvasions using examples taken from the
Mediterranean/Black Sea region. Particular attention is given to the environmental status of the receiving area as a fundamental prerequisite
for the colonisation success of alien species. The spread of the tropical algae belonging to the genus Caulerpa in the
northwestern basin of the Mediterranean Sea has been facilitated by pre-existing conditions of instability of the Posidonia oceanica
endemic ecosystem in relation to stress of both natural and anthropogenic origin. Human interventions caused long-term modification
in the Black Sea environment, preparing a fertile ground for mass bioinvasion of aquatic nuisance species which, in some
cases, altered the original equilibrium of the entire basin. Finally, the Venice lagoon is presented as the third example of an environment
subjected to high propagule pressure and anthropogenic forcing and bearing the higher ‘‘diversity’’ of non-indigenous
species compared to the other Mediterranean lagoons. Stressed environments are easily colonised by alien species; understanding the
links between human and natural disturbance and massive development of non-indigenous species will help prevent marine bioinvasions,
that are already favoured by global oceanic trade
Molecular approaches for bivalve population studies: a review
No full textThis paper presents a literature review concerning the importance of molecular approaches in bivalve’s population study. The class Bivalvia counts more than 20,000 species with a wide distribution both in freshwater and marine environment. Given their importance especially in aquaculture as a source of food, they have also a strong economic impact upon human society. This review encompasses best practices in bivalve studies from field sampling to laboratory analyses, addressing questions about molecular methods and tools commonly used by specialized researchers. Molecular tools specifically deals with phylogeography, population genetics, biology, ecology and taxonomy. In all these fields, molecular markers play an important role by completing some unanswered questions such as the role of the bivalves in the ecosystems in relation to anthropogenic and global change issues. Numerous genetic markers were developed for specific problems, thereferore we identify as a major issue the absence of uniform and universally recognized methods. The various sections of the paper emphasize from peer reviewed literature literature which are considered the most useful markers, costs and benefits of different methodology, major gaps of knowledge.in bivalve population studies. By reviewing virtually all genetic markers employed during nearly half a century of bivalve molecular research, in our opinion two are the best option “tools: the mitochondrial COI (cytochrome oxidase subunit I) and nuclear ITS2 (internal transcribed spacer 2)
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