Observation field: Invasion extent
Extent of invasion by alien species at the observation site and within a 0.001deg lat/lon range (approximately 1ha). Please choose the highest appropriate level. More details in the comments at https://www.inaturalist.org/observation_fields/12426 .
mferreira
Observations specifying this field
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Projects Using This Field
Experimentação em controlo de flora exótica invasora
Lousã Flora Autóctone
Caminhos e trilhos na Lousã
Biorreservas em estudo na Lousã
Limites dos Baldios na Lousã
Flora22
Comments
1 - at risk: no invasive alien species were observed at the site but they might be present (seeds, roots, sprouts, etc.) because they were seen nearby. Without preemptive measures, invasion is very likely to occur within one decade.
(Abbreviated tag: "invasion: 1 - likely")
2 - first stages: some specimens of invasive alien species were seen at the site but it may be easy to remove them (single intervention by a couple of people, for less than a couple of hours, using bare hands or just manual tools, eventually with a couple of visits in the following months or years).
(Abbreviated tag: "invasion: 2 - beginning")
3 - significant invasion: it may be possible to revert the invasion but several interventions will be needed, involving several people (half a dozen or more). No machinery should be needed.
(Abbreviated tag: "invasion: 3 - significant")
4 - massive invasion: it may be possible to revert the invasion but that would require an intensive intervention by specialized people with appropriate machinery.
(Abbreviated tag: "invasion: 4 - massive")
5 - nearly irreversible: the removal of invasive alien species and ecosystem restoration would require intensive and long-term intervention, not only at the site but also in the vicinity, for many years or several decades. Though theoretically possible, it would require excessive resources, unlikely to be available for such an extended period.
(Abbreviated tag: "invasion: 5 - overwhelming")
6 - irreversible invasion: some native species are still present at the site but they are unable to compete with the invasive alien species and are likely to disappear within a decade. Moreover, the density of invasive alien species is so high (with seeds and/or roots all over the place) that even a massive intervention with appropriate machinery would be insufficient to revert the invasion. Through repeated intervention, it may be possible to control the density of invasive alien species in order to prevent the total disappearance of native species, but not more than that.
(Abbreviated tag: "invasion: 6 - irreversible")
7 - uncontrollable invasion: the density of invasive alien species is so high (including seeds in the soil, sprouts from the roots, etc.) that it is no longer feasible to prevent the growth of more invasive plants at the site. The remaining patches of native vegetation will inexorably be replaced by the invasive alien species within a few years.
(Abbreviated tag: "invasion: 7 - uncontrollable")
8 - final stages: there are just a few small patches of native vegetation at the site (few meters in diameter) which will soon disappear as the invasive alien species grow and expand (reducing sunlight, available nutrients, etc.).
(Abbreviated tag: "invasion: 8 - finalising")
9 - full invasion: the invasive alien species have occupied the whole site, changing the environment in their favour (soil composition, shading, etc.) and displacing almost all native species. The only remaining native species are the ones that can coexist with the invasive alien species or perhaps benefit from them (for example fungi that are able to feed from the organic matter in the soil).
(Abbreviated tag: "invasion: 9 - complete")
Versão portuguesa (com alguns melhoramentos e esclarecimentos):
Em https://www.inaturalist.org/journal/mferreira/40453-uma-escala-para-avaliar-a-presenca-de-especies-exoticas-invasoras-em-cada-local poderá encontrar uma descrição de cada nível de invasão em Português. Os níveis foram agrupados dois a dois para mais fácil compreensão. São referidas algumas vantagens das "etiquetas" relativamente aos "campos" e é sugerida uma etiqueta para cada nível de invasão.
Versão portuguesa revista, baseada na percentagem de área ocupada: https://www.biodiversity4all.org/journal/mferreira/47736-nivel-de-invasao-por-especies-exoticas-escala-simplificada-baseada-na-percentagem-de-area-invadida
0 - no invasion: known invasive alien species were not seen at the site or in its vicinity. Invasion is unlikely to occur in the following decade or more, even without preemptive intervention.
(Abbreviated tag: "invasion: 0 - absent")