Exotic species are considered invasive when they settle in a new area, proliferate and persist, threatening ecosystems, habitats and/or other species. The mobility of a species and its adaptability to new environmental conditions determine the dispersal and colonisation of new habitats by exotic species. ĭispersal and colonisation are fundamental ecological processes that determine the distribution of populations, and their genetic structure, dynamics and persistence, and are fundamental components of the colonisation process. These invasions, whether deliberate or accidental, can result in marked changes in the organisation of natural ecosystems, which can have major economic and ecological impacts, in part by altering the composition of local communities and disrupting ecosystem services. The introduction of exotic stream-dwelling fishes to local basins or wider areas is mainly the result of human activities worldwide. punctatus populations, either by direct or indirect action.īiological invasions are a major threat to global biodiversity and often affect ecosystem structure and function. maculicauda reinforces the conclusion that the colonisation of the stream by the exotic species had deleterious effects on the density of the resident H. punctatus densities at the sites not colonised by P. maculicauda seems to have a negative effect on H. Our analysis shows that colonisation by P. maculicauda, but its density decreased at all upstream sites after the arrival of the exotic species. Hypostomus punctatus was registered at all sample sites both before and after the introduction of P. By the end of the study, it was found at all points upstream from the original site. maculicauda occurred in the medium sector of the stream, and during the course of the study, the species dispersed to new sites further upstream. The distribution and density of the two species were determined by the Successive Removal Method. Specimens were collected at eight sites located along the course of the stream over a 15-year period. In this study, we analysed the dispersal of an exotic loricariid fish the red fin dwarf pleco ( Parotocinclus maculicauda) in a stream of the Atlantic Forest biome in coastal south-eastern Brazil and evaluated the effects of this invasion on the native loricariid common pleco ( Hypostomus punctatus). You can easily add commentary on any specific aspect of the system, and share this information as needed.The introduction of invasive species represents a major threat to the integrity of stream-dwelling fish populations worldwide, and this issue is receiving increasing attention from scientists, in particular because of potential impact on biodiversity. The hub also enables you to easily collaborate with the Burnham QC team. The interactive hub provides you with inspection results, scores and references, when and where you need the information. Let technology work for your company, don't make your company work for technology.īurnhamEYE™ provides you with real-time data that is accessible through our centralized, secured hub. Use BurnhamEYE™ for all of your enterprise inspection needs and let your Quality Assurance team work in a centralized location. Instead of filling out your classic paper forms, it's time to move forward with technology and lose the pen and paper. Upon submission of your inspection data, BurnhamEYE™ also offers a Quality Assurance application to display the inspection data. BurnhamEYE™ offers the capability of scheduling your inspections from one central location to a multitude of devices to keep your inspections on task. BurnhamEYE™ is the exclusive Burnham Nationwide application for conducting surveys customized to your company's inspection needs.
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