Space use patterns and the extent of complementarity across scales in introduced seed dispersers

Wilcox, Rebecca C.; Tarwater, Corey E.

doi:10.1007/s10530-022-02786-7

Cited by 4 publications

(7 citation statements)

References 75 publications

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“…For example, the European rabbit is a legitimate seed disperser of a native forest species, and it also favors seedling recruitment [ 35 ]; however, this exotic mammal is widely known to disperse seeds of invasive plant species (e.g., [ 37 , 38 , 39 ]), in addition to grazing on tree seedlings of native species [ 40 , 41 ]. Similarly, the long-tailed macaque disperses but also destroys native seeds, and facilitates plant invasions [ 25 ], while exotic birds can disperse both native and exotic plants species via epi- and endozoochory [ 27 , 36 ]. Other exotic birds can surrogate dispersal services in depauperated frugivory communities, but their reduced efficiency can lead to low germination rates and increased pre-dispersal predation in undispersed seeds of native plants [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Ecological Impacts of Exotic Species on Native Seed Dispersal Systems: A Systematic Review

Cordero

Gálvez

Fontúrbel

2023

Plants

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Exotic species are one of the main threats to biodiversity, leading to alterations in the structure and functioning of natural ecosystems. However, they can sometimes also provide ecological services, such as seed dispersal. Therefore, we assessed the ecological impacts of exotic species on native dispersal systems and the mechanisms underlying the disruption of mutualistic plant–disperser interactions. Exotic species negatively affect dispersal mutualisms by (i) altering dispersal behavior and visitation rates of native dispersers, (ii) predating native dispersers, (iii) transmitting forest pathogens, and (iv) predating seeds. Conversely, positive impacts include the dispersal of native plants, forest regeneration, and native habitat restoration via (i) increasing the visitation rates of frugivorous birds, (ii) facilitating the colonization and establishment of native forest trees, (iii) enhancing forest species seedling survival, and (iv) facilitating seed rain and seedling recruitment of early and late successional native plants. The reviewed studies provide similar results in some cases and opposite results in others, even within the same taxa. In almost all cases, exotic species cause negative impacts, although sometimes they are necessary to ensure native species’ persistence. Therefore, exotic species management requires a comprehensive understanding of their ecological roles, since the resulting effects rely on the complexity of native–exotic species interactions.

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Section: Resultsmentioning

confidence: 99%

Ecological Impacts of Exotic Species on Native Seed Dispersal Systems: A Systematic Review

Cordero

Gálvez

Fontúrbel

2023

Plants

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“…In Europe, Red-billed Leiothrix prefer deciduous or mixed woodlands and shrublands with dense understorey thickets (Herrando et al 2010, Farina et al 2013, Ramellini et al 2019, Pereira et al 2020a, especially those close to water (Cordier 2002, Keller et al 2020, but see Ramellini et al 2019, Wilcox & Tarwater 2022. Pairs occupy breeding territories in spring/summer, which are often grouped together (Cordier 2002, Herrando et al 2010, Farina et al 2013.…”

Section: The Red-billed Leiothrix As An Invasive Speciesmentioning

confidence: 99%

“…Red-billed Leiothrix can have negative impacts as an invasive species, through competition with native birds and as a vector for the spread of exotic plants and infectious diseases (Martin-Albarracin et al 2015). For example, in Hawaii, Red-billed Leiothrix preferentially feed on non-native fruits, helping to disperse their seeds (Vizentin-Bugoni et al 2019, Wilcox & Tarwater 2022. Additionally, Red-billed Leiothrix seem largely unaffected by some diseases, such as avian malaria, that seriously affect native Hawaiian birds (Ralph et al 1998), and they can also host avian influenza, which is a risk to poultry (Lee et al 2019).…”

Section: The Red-billed Leiothrix As An Invasive Speciesmentioning

confidence: 99%

“…2020, but see Ramellini et al . 2019, Wilcox & Tarwater 2022). Pairs occupy breeding territories in spring/summer, which are often grouped together (Cordier 2002, Herrando et al .…”

Section: The Red‐billed Leiothrix As An Invasive Speciesmentioning

confidence: 99%

“…For example, in Hawaii, Red‐billed Leiothrix preferentially feed on non‐native fruits, helping to disperse their seeds (Vizentin‐Bugoni et al . 2019, Wilcox & Tarwater 2022). Additionally, Red‐billed Leiothrix seem largely unaffected by some diseases, such as avian malaria, that seriously affect native Hawaiian birds (Ralph et al .…”

Section: The Red‐billed Leiothrix As An Invasive Speciesmentioning

confidence: 99%

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The Red‐billed Leiothrix (Leiothrix lutea): a new invasive species for Britain?

Broughton

Ramellini

Maziarz

et al. 2022

Ibis

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Invasive non‐native species (INNS) are one of the major threats to global biodiversity. Climate change and garden bird‐feeding may facilitate the establishment of INNS. The Red‐billed Leiothrix Leiothrix lutea is a small woodland passerine, native to subtropical Asia, that is an INNS in several parts of the world, including Europe, following escapes from the aviculture trade. Recently, populations of Red‐billed Leiothrix have established in Spain, Portugal, Italy and France. Previous studies have shown that much of Europe is suitable for the species, including southern Britain. The Red‐billed Leiothrix has not previously been considered as at high risk of establishment in Britain, but we document recent records, including a cluster in southern England, suggesting that establishment may already be underway. We discuss the potential negative impacts of this invasive species on local ecosystems, and how a warming climate and garden bird‐feeding might assist their establishment in temperate Europe. We also highlight the importance of improved recording to monitor the potential establishment of INNS, such as the Red‐billed Leiothrix, in Britain.

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Exploitation competition between seed predators and dispersers introduced toHawaiian forests

Case

Tarwater

2023

Ecology

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Exploitation competition occurs when one group of organisms reduces the availability of a resource for another group of organisms. For instance, plants produce a certain number of fruits for seed dispersal by fruit‐eating animals (hereafter frugivores), and fruit consumption by one group of frugivores can reduce the number of fruits available for other frugivores. However, it is uncertain whether exploitation competition is common among frugivores, particularly in novel ecosystems, where food resources are generally thought to be abundant and invasive species are dietary generalists. In a novel ecosystem in Hawai‘i, we used gut passage experiments with captive birds to identify roles of introduced frugivores and found they were either distinctly seed dispersers or predators. We then experimentally tested how frugivory by seed predators influenced frugivory by seed dispersers. Specifically, we used exclosures around fruiting plants that blocked seed predator access, while permitting seed disperser access, and we had two control treatments that allowed for access by all frugivores (n = 139 plants). When seed predators were excluded from plants, there was more frugivory by dispersers compared to controls, and results varied by year and plant species. Overall, we show that introduced frugivores occupied distinct ecological roles (seed predator or seed disperser), exploitation competition occurred between these introduced frugivore groups, and seed predators had both direct (via seed destruction) and indirect (via reduction in frugivory by dispersers) effects on seed dispersal. Thus, in this novel ecosystem, multiple frugivory is subtractive, and competition for fruit between introduced seed predators and seed dispersers scales up to affect invasions and the conservation of native flora.

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Space use patterns and the extent of complementarity across scales in introduced seed dispersers

Cited by 4 publications

References 75 publications

Ecological Impacts of Exotic Species on Native Seed Dispersal Systems: A Systematic Review

Ecological Impacts of Exotic Species on Native Seed Dispersal Systems: A Systematic Review

The Red‐billed Leiothrix (Leiothrix lutea): a new invasive species for Britain?

Exploitation competition between seed predators and dispersers introduced toHawaiian forests

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