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

Non-native insects dominate daytime pollination in a high-elevation Hawaiian dryland ecosystem

PREMISE OF THE STUDY

Over one-third of the native flowering plant species in the Hawaiian Islands are listed as federally threatened or endangered. Lack of sufficient pollination could contribute to reductions in populations, reproduction, and genetic diversity among these species but has been little studied.

METHODS

We used systematic observations and manual flower treatments to quantify flower visitation and outcrossing dependency of eight native (including four endangered) plant species in a dryland ecosystem in Hawaii: Argemone glauca, Bidens menziesii, Dubautia linearis, Haplostachys haplostachya, Sida fallax, Silene lanceolata, Stenogyne angustifolia, and Tetramolopium arenarium.

KEY RESULTS

During 576.36 h of flower observations, only insects visited the flowers. Out of all recorded flower visits, 85% were performed by non-native species, particularly the honeybee (Apis mellifera) and flies in the family Syrphidae. Some plant species received little visitation (e.g., S. angustifolia received one visit in 120 h of observation), whereas others were visited by a wide diversity of insects. The endangered plant species were visited by fewer visitor taxa than were the common native plant species. For six of the focal plant species, bagging of flowers to exclude pollinators resulted in significant reductions in seed set.

CONCLUSIONS

The flower visitor community in this system, although heavily dominated by non-native insects, appears to be facilitating pollination for multiple plant species. Non-native insects may thus be sustaining biotic interactions otherwise threatened with disruption in this island ecosystem. This may be particularly important for the studied endangered plant species, which exhibit fewer partners than the more common plant species.

The Promise of the Organizational Ecosystem Metaphor: An Argument for Biological Rigor

Organizational scholars often adopt biological models to explain the emergence and evolution of organizations and human systems. One recent example of such adoption is the organizational ecosystem metaphor. In this article, we contend that taking a rigorous ecological approach over the application of loose ecosystem language has the potential to illuminate patterns in the life span of organizations and human systems. We first define five central properties of biological ecosystems and demonstrate their potential relevance to human-constructed systems (organizational ecosystems). We then argue the value of developing biologically based hypotheses that can be tested in the context of organizational systems. Next, we propose a set of hypotheses specific to organizational stability and disruption, using Arizona charter schools as an example to demonstrate the promise of the rigorous application of the organizational ecosystem metaphor. We close with a discussion of how the insights generated might be applied across other organizational settings and systems.