Spatiotemporal Patterns of Alien Plant Invasions in One of the Last Pristine Wet Forests of Hawai‘i

Ibanez, Thomas; Gross, Jacob; Hart, Patrick J.; Ainsworth, Alison; Mallinson, Jeffrey; Monello, Ryan J.

doi:10.2984/74.2.1

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…Our analysis revealed that occupancy, but not abundance, of alien woody species increases with residence time. This suggests that alien woody species, at least those introduced to the Hawaiian archipelago since the 19th century, progressively expand their non‐native range and occupy new locations (e.g., Daehler, 2005; Ibanez et al, 2020). Indeed, four of the five alien woody species with the highest occupancy across the archipelago in our data set, Psidium cattleianum , Leucaena leucocephala , Psidium guajava , and Aleurites moluccanus were first introduced before 1900.…”

Section: Discussionmentioning

confidence: 99%

Niche properties constrain occupancy but not abundance patterns of native and alien woody species across Hawaiian forests

Craven

Weigelt

Wolkis

et al. 2021

J Vegetation Science

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Questions Islands harbour a disproportionate amount of global plant diversity, yet their unique native assemblages are particularly vulnerable to biological invasions. It is therefore critical to identify the macroecological constraints that mediate spatial distributions of alien species on islands. Here, we examined abundance–occupancy relationships of native and alien woody plant species, and the role of niche properties and functional traits related to dispersal and competition in shaping occupancy and abundance patterns. Location Hawaiian Islands. Methods We calculated relative abundance and occupancy for 64 woody species (42 natives, 22 naturalized aliens), and estimated each species' niche breadth and position. We fitted phylogenetic hierarchical Bayesian models to evaluate abundance–occupancy relationships and the impacts of niche properties and functional traits on occupancy and abundance of native and alien species. Results Our analyses revealed that locally more abundant native species were also more widespread, but that the abundance of alien species was unrelated to their occupancy. Yet, we found evidence that alien species with longer residence times on the Hawaiian Islands were more widespread. While widespread native and alien woody species both had broad niches, widespread alien woody species exhibited a tendency to occur in more marginal niche positions than widespread native woody species. Niche properties did not affect abundances of either native or alien woody species. Traits associated with dispersal capacity and competitive ability had minimal impacts on either occupancy or abundance of native and alien woody species. Conclusions We found that niche properties shape the occupancy but not the abundance of native and alien woody species across Hawaiian forests. Our results suggest that, because of substantial invasion debts, the impacts of alien woody invasions in native forests have yet to fully manifest.

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Section: Discussionmentioning

confidence: 99%

Niche properties constrain occupancy but not abundance patterns of native and alien woody species across Hawaiian forests

Craven

Weigelt

Wolkis

et al. 2021

J Vegetation Science

View full text Add to dashboard Cite

show abstract

“…These species were recorded in Kīpahulu in 1967 (Lamoureux 1968) and highlighted as threats to native species diversity in the 1980s (Anderson et al 1992), and Hypochaeris radicata was the only non-native recorded above 2,700 m in the early 1990s (Kitayama and Mueller-Dombois 1992). Both invaders were assigned high weed risk assessment scores (i.e., more invasive potential; Daehler et al 2004), were the most frequently encountered non-natives along 1,000 m subalpine transects in 2012 (51% and 73%, respectively) (Gross et al 2017), and were the highest elevation (1,100 m to > 2,000 m) non-native species in a recent Kīpahulu study (Ibanez et al 2020). Despite high frequency for these species on Haleakala -, cover remains low (< 5%) (Gross et al 2017).…”

Section: Non-native Speciesmentioning

confidence: 99%

“…They are still dominated by native plant species, but recent studies of temperate versus tropical invaders and models of habitat invasibility under changing climate scenarios have predicted future increases in invasion pressure at upper elevations (Angelo andDaehler 2013, Vorsino et al 2014). There have already been documented increases in presence for many non-native species (Ibanez et al 2020). Up until the 1990s, these communities were highlighted for their lack of non-native plant invasion, with the notable exception of invasive Verbascum thapsus (Gagné and Cuddihy 1990).…”

mentioning

confidence: 99%