Imperfect Replacement of Native Species by Non‐Native Species as Pollinators of Endemic Hawaiian Plants

Aslan, Clare E.; Zavaleta, Erika S.; Tershy, Bernie R.; Croll, Don; Robichaux, Robert H.

doi:10.1111/cobi.12193

Cited by 50 publications

(49 citation statements)

References 43 publications

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“…a), suggesting that not only are invasive species in this system potentially filling in open functional niches in the community (e.g. Aslan et al ., ) and integrating into native pollination networks (e.g. Oleson et al ., ), but also that their floral traits (possibly selected along different axes or towards different optima in their original ranges) were leading to qualitatively different relationships between floral morphology and species roles in pollen transfer networks in their introduced location.…”

Section: Discussionmentioning

confidence: 99%

Consequences of invasion for pollen transfer and pollination revealed in a tropical island ecosystem

Johnson

Ashman

2018

New Phytologist

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Pollination is known to be sensitive to environmental change but we lack direct estimates of how quantity and quality of pollen transferred between plant species shifts along disturbance gradients. This limits our understanding of how species compositional change impacts pollen receipt per species and structure of pollen transfer networks. We constructed pollen transfer networks along a plant invasion gradient in the Hawaiian dry tropical forest ecosystem. Flowers and stigmas were collected from both native and introduced plants, pollen was identified and enumerated and floral traits were measured. We also characterized pollen loads carried by individuals of the dominant invasive pollinator, Apis mellifera. Species flowering in native-dominated sites were more tightly connected by pollen transfer than those in heavily invaded sites. Compositional turnover in the pollen loads of A. mellifera was correlated (70%) with turnover in the composition of pollen transfer networks. Floral traits predicted species roles within pollen transfer networks, but many of these differed qualitatively depending on whether plants were native or introduced. Our work indicates that pollen transfer networks change with invasion. Floral morphology and foraging behaviour of the introduced super-generalist pollinator are implicated as key in determining the roles introduced species play within native pollen transfer networks.

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Section: Discussionmentioning

confidence: 99%

Consequences of invasion for pollen transfer and pollination revealed in a tropical island ecosystem

Johnson

Ashman

2018

New Phytologist

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“…Another Zosterops species, Z. japonicus from east Asia, was introduced to Hawaii (Simberloff and Boecklen 1991) where it has replaced extinct native mutualists (Aslan et al 2014) but also has contributed to the invasion of plant species (Woodward et al 1990). Non-native species can play both positives or negative roles, replacing functions which have been lost (Aslan et al 2014), or displacing native species and breaking mutualistic relationships that will be lost in the community (Hansen and Müller 2009b). Non-native species can play both positives or negative roles, replacing functions which have been lost (Aslan et al 2014), or displacing native species and breaking mutualistic relationships that will be lost in the community (Hansen and Müller 2009b).…”

Section: Traits Of the Double Mutualistsmentioning

confidence: 99%

“…Geographically isolated ecosystems are those harboring the lowest number of species (MacArthur and Wilson 1967), which constrains the species pool of potential mutualistic partners. In the decimated native bird fauna of Hawaii, for instance, the introduced Japanese white-eye Zosterops japonica feeds on floral and fruit resources of the same plant species, acting both as a pollinator and disperser (Aslan et al 2014). In such ecosystems, species may evolve generalized and opportunistic behaviors, establishing interactions with a large proportion of the local biota.…”

Section: Introductionmentioning

confidence: 99%

Global patterns of the double mutualism phenomenon

Fuster¹,

Kaiser‐Bunbury

Olesen

et al. 2018

Ecography

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A double mutualism (DM) occurs when two interacting species benefit each other in two different functions, e.g. when an animal species acts both as pollinator and seed disperser of the same plant. Besides the double benefit, a DM also imposes a larger risk to both functions if the performance of one partner declines. We conducted the first global review of DMs involving pollinators and seed dispersers, aiming to: 1) assess their prevalence across ecosystems and biogeographical regions; 2) identify the main plant and animal taxa, and their traits, implicated in DMs; and 3) evaluate the conservation status of double mutualist species. We compiled published and unpublished DM records using specific search terms, noting the species involved, their conservation status and geographic location, as well as the type of study (species vs communitylevel) in which the DM was detected. We identified 302 DM cases involving 207 plant and 92 animal species from 16 mainland and 17 island areas. Most records come from tropical regions and islands. Animals included birds (62%), mammals (22%), and reptiles (16%), mostly opportunist species; only 18% were nectarivores. Plants were mainly fleshy-fruited shrub or tree species (59%) with actinomorphic flowers that were visited by several or many pollinator species (87%). Most (56%) DMs were detected in community-level studies. DMs are mostly prevalent in ecosystems with limited food resources and mutualist partners, and with high generalization levels. Nearly 30% of the species involved in DMs are threatened according to IUCN criteria, 68% of which are found on islands. The high prevalence of DM on islands paired with the threat status of island species suggest that the loss of a double mutualists and its cascading consequences may have a severe impact on community composition and functioning of fragile island ecosystems.

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“…Efforts to restore lobeliad populations and native plant communities include outplanting into forest sites fenced to exclude exotic browsing mammals (R. Robichaux 2014, University of Arizona, Tucson, AZ, U.S.A., personal communication). Outplanting of lobeliads at high‐elevation sites with maximum diversity of remnant native as well as non‐native nectarivorous birds boosts redundancy in the pollinator guild and elevates the probability of pollination (Aslan et al ). Protection of remnant lobeliads from non‐native mammals enhances the structural diversity of forest patches.…”

Section: The Role Of Interactions and Resilience In Restoration: Casementioning

confidence: 99%

Leveraging nature's backup plans to incorporate interspecific interactions and resilience into restoration

Aslan

Bronstein

Rogers

et al. 2016

Restoration Ecology

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Interspecific interactions are important structuring forces in ecological communities. Interactions can be disturbed when species are lost from a community. When interactions result in fitness gains for at least one participating organism, that organism may experience reduced fitness as a result of interaction disturbance. However, many species exhibit traits that enable individuals to persist and reproduce in spite of such disruptions, resulting in resilience to interaction disturbance. Such traits can result in interaction generalization, phenotypic and behavioral plasticity, and adaptive capacity. We discuss examples of these traits and use case studies to illustrate how restoration practitioners can use a trait-based approach to examine species of concern, identify traits that are associated with interspecific interactions and are relevant to resilience, and target such traits in restoration. Restoration activities that bolster interaction resilience could include, for example, reintroducing or supporting specific functional groups or managing abiotic conditions to reduce interaction dependence by at-risk species (e.g. providing structural complexity offering shelter and cover). Resilience may also be an important consideration in species selection for restoration. Establishment of resilient species, able to persist after interaction disturbance, may be essential to restoring to a functioning ecological community. Once such species are present, they could help support more specialized species that lack resilience traits, such as many species of concern. Understanding the conditions under which processes linked to resilience may enable species to persist and communities to reform following interaction disturbance is a key application of community ecology to ecological restoration.

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Imperfect Replacement of Native Species by Non‐Native Species as Pollinators of Endemic Hawaiian Plants

Cited by 50 publications

References 43 publications

Consequences of invasion for pollen transfer and pollination revealed in a tropical island ecosystem

Consequences of invasion for pollen transfer and pollination revealed in a tropical island ecosystem

Global patterns of the double mutualism phenomenon

Leveraging nature's backup plans to incorporate interspecific interactions and resilience into restoration

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