Pollination biology reveals challenges to restoring populations of Brighamia insignis (Campanulaceae), a critically endangered plant species from Hawai‘i

Walsh, Seana K.; Pender, Richard; Junker, Robert R.; Daehler, Curtis C.; Morden, Clifford W.; Lorence, David H.

doi:10.1016/j.flora.2019.151448

Cited by 26 publications

(31 citation statements)

References 79 publications

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“…Some institutions have early evidence of inbreeding depression, such as nonviable seed after hand pollination (K.H., personal observation). Similarly, results of a recent study of B. insignis at NTBG show that pollen viability has declined in many plants, which may be evidence of inbreeding depression in this collection (Walsh et al 2019).…”

Section: Limiting Inbreeding In the Ex Situ Metacollectionsupporting

confidence: 59%

Applying the zoo model to conservation of threatened exceptional plant species

Wood

Ballou

Callicrate

et al. 2020

Conservation Biology

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Maintaining a living plant collection is the most common method of ex situ conservation for plant species that cannot be seed banked (i.e., exceptional species). Viability of living collections, and their value for future conservation efforts, can be limited without coordinated efforts to track and manage individuals across institutions. Using a pedigree-focused approach, the zoological community has established an inter-institutional infrastructure to support long-term viability of captive animal populations. We assessed the ability of this coordinated metacollection infrastructure to support the conservation of 4 plant species curated in living collections at multiple botanic gardens around the world. Limitations in current practices include the inability to compile, share, and analyze plant collections data at the individual level, as well as difficulty in tracking original provenance of ex situ material. The coordinated metacollection framework used by zoos can be adopted by the botanical community to improve conservation outcomes by minimizing the loss of genetic diversity in collections. We suggest actions to improve ex situ conservation of exceptional plant species, including developing a central database to aggregate data and track unique individuals of priority threatened species among institutions and adapting a pedigree-based population management tool that incorporates life-history aspects unique to plants. If approached collaboratively across regional, national, and global scales, these actions could transform ex situ conservation of threatened plant species.

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Section: Limiting Inbreeding In the Ex Situ Metacollectionsupporting

confidence: 59%

Applying the zoo model to conservation of threatened exceptional plant species

Wood

Ballou

Callicrate

et al. 2020

Conservation Biology

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“…Nectar larceny by birds generally occurs in specialized flowers with long floral tubes that are difficult for birds with small bills to reach (Rojas-Nossa et al 2016). In our study, bird species had small bills (13.12 -16.66 mm culmen length, compared to the floral tube lengths of the lobelioid species we examined (45 -90 mm corolla length) (Wagner et al 1999). Previous studies have reported nectar larceny of Hawaiian lobelioids by warbling white-eye and Oʻahu ʻamakihi (Gardener & Daehler 2006, Aslan et al 2014).…”

Section: Nectar Larceny By Birdsmentioning

confidence: 50%

“…Nectar analyses and morphological traits (e.g. floral tube shape) suggest that most genera of Hawaiian lobelioids (all except Brighamia) (Walsh et al 2019) were originally pollinated by birds with long bills, including honeycreepers (Drepanidae) and ʻōʻōs (Mohoidae) (Pender et al 2014, Walsh et al 2019. Owing to the extinction or decline in populations of historic pollinators (Elphick et al 2010;Magnacca & King 2013) in modern forests, present lobelioid pollinators may potentially include remaining native species of honeycreeper (original pollinating species are not likely present on O'ahu) and yellow-faced bees (Hylaeus sp.…”

Section: Cyanea Longiflora Clermontia Persicifoliamentioning

confidence: 99%

Pollination and nectar larceny by birds and bees in novel forests of the Hawaiian Islands

2021

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The extinction of native species and introduction of non-native species may lead to the disruption of biotic interactions. Pollination is a critical ecosystem process that often requires mutualisms between animals and plants. Non-native animals may interact with native flowering plants, with the potential to pollinate or steal nectar (larceny) from flowers without pollination. In the Hawaiian Islands, many native plants have lost their original pollinators. Birds and insects are known to visit native plant flowers, but it is unclear whether they pollinate or steal nectar, whether native and non-native species differ in their interactions with flowers, and what influences visitation to flowers. On Oʻahu, we deployed camera traps and conducted in-person observations on four at-risk species of Hawaiian lobelioids (Campanulaceae). We observed birds, mammals, and insects visiting flowers, with a native bird and native bee visiting most frequently. Regardless of native versus non-native status, bees made contact with reproductive structures during most visits (90.5% of visits), while birds stole nectar during most visits (99.3% of visits). Bee and bird visitation increased with the number of flowers on focal plants. Bird visitation also increased with canopy cover and the number of nearby conspecific flowers and decreased with the number of nearby heterospecific flowers. Our results indicate that bees may pollinate plants that were historically bird-pollinated, while native and non-native birds have neutral or negative impacts on these plants. Broadly, we contribute to an understanding of how native plant pollination can be altered in changing ecosystems.

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“…Given the important role of sphinx moths as pollinators in tropical ecosystems, especially tropical dry forests (Amorim et al, 2009; Haber & Frankie, 1989), the impacts of the rarity or disappearance of BSM may be far ranging; the decline of several endangered Hawaiian plants is thought to have resulted from the loss of their sphinx moth pollinator (Huppman, 2013; USFWS, 2007; Walsh et al, 2019). Ongoing work by conservationists and land managers seeks to restore Hawaiian dry forests, the habitat of BSM.…”

Section: Discussionmentioning

confidence: 99%