Pollen Carried by Native and Nonnative Bees in the Large-Scale Reforestation of Pastureland in Hawai‘i: Implications for Pollination

Miller, Adam E.; Brosi, Berry J.; Magnacca, Karl N.; Daily, Gretchen C.; Pejchar, Liba

doi:10.2984/69.1.5

Cited by 18 publications

(15 citation statements)

References 56 publications

(96 reference statements)

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“…Contrary to other regions in the world where native flower visitors commonly visit flowers of exotic species (e.g. Chittka & Schürkens, ; Williams et al., ), we recorded very few interactions of native Hawaiian flower visitors with exotic plants (see also Miller, Brosi, Magnacca, Daily, & Pejchar, ). This leads to the assumption that natives may not be able to utilize the resources offered by exotic plant species.…”

Section: Discussioncontrasting

confidence: 74%

Exotic flower visitors exploit large floral trait spaces resulting in asymmetric resource partitioning with native visitors

et al. 2017

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Exotic species often cause severe alterations in native communities due to their ability to rapidly and efficiently utilize a broad spectrum of resources. In flower–visitor interactions, the breadth of resource use by native and exotic animals as well as the partitioning of resources among them is often estimated based on the number of (shared) plant species used as resources. However, whether a flower visitor is able to exploit plant resources has been shown to be delimited by functional floral traits such as morphological barriers or attractive or repellent chemical cues. Each of the ecologically relevant traits can be viewed as a dimension of a Hutchinsonian n‐dimensional hypervolume, which characterizes the range of phenotypes exploitable by a species. In this study, we quantified the sizes and overlaps of n‐dimensional hypervolumes defined by floral traits that are exploited by native and exotic flower visitors (afterwards referred to as exploited space, ES). In the heavily invaded Hawaii Volcanoes National Park, USA, we phenotyped 40 native and exotic plant species and recorded flower–visitor interactions. To quantify the size and overlap of ES, we applied dynamic range boxes. On average, exotic flower visitors were more generalized in resource use (larger ES) than natives ones, which is additionally indicated by the absence of native flower visitors on exotic flowering plant species. In particular, ES based on floral scent emission was larger for exotic flower visitors compared to native ones. The unevenly expanded ES of native and exotic animals led to an asymmetric overlap of floral ES where exotic flower visitors shared only a small proportion of their ES with natives but occupied a large proportion of the ES of natives. The asymmetry in resource use of native and exotic flower visitors suggests a potential advantage in resource exploitation of the latter, potentially explaining their success in Hawaiian ecosystems. Predicted range expansion of exotic plant and animal species may further increase the competition for and reduce the availability of resources for native animals. This may lead to further declines of native species and increasing threats for Hawaiian ecosystems. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.12932/suppinfo is available for this article.

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Section: Discussioncontrasting

confidence: 74%

Exotic flower visitors exploit large floral trait spaces resulting in asymmetric resource partitioning with native visitors

et al. 2017

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“…Given the drastic change of pollination networks in this case study, conservation biologists recommend the removal of managed honeybees and eradication of feral colonies to restore native bee populations. Similar cases were inferred in other oceanic island systems of various sizes, including the Canary islands for honeybees (Dupont et al, 2004) or Hawaii (Miller et al, 2015)-see also Hansen et al (2002) for negative effects of introduced honeybees on endemic nectarivorous birds in Mauritius, and KaiserBunbury et al (2010) for additional insular examples involving introduced bumblebees.…”

Section: Box 1 Oceanic Islandssupporting

confidence: 66%

Massively Introduced Managed Species and Their Consequences for Plant–Pollinator Interactions

Geslin

Gauzens

Baude

et al. 2017

Advances in Ecological Research

152

141

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“…They tend to forage from a mix of both native and invasive flowering species, as was indicated by the pollen load composition recorded here. Bees in the genus Hylaeus , the only native bee genera in the Hawaiian islands, are specialized and tend to carry pure loads of conspecific pollen almost exclusively collected from native flowering plants (Miller et al ., ; Kuppler et al ., ). These native bees, however, are experiencing steep declines in the regions of Hawaii where the present study was conducted (Magnacca & King, ).…”

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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Pollen Carried by Native and Nonnative Bees in the Large-Scale Reforestation of Pastureland in Hawai‘i: Implications for Pollination

Cited by 18 publications

References 56 publications

Exotic flower visitors exploit large floral trait spaces resulting in asymmetric resource partitioning with native visitors

Exotic flower visitors exploit large floral trait spaces resulting in asymmetric resource partitioning with native visitors

Massively Introduced Managed Species and Their Consequences for Plant–Pollinator Interactions

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

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