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Grass Biomass in experimental plots, Hakalau Forest, Hawaii, 2015


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Yelenik, S.G., Paxton, E., and Rose, E.T., 2020, Avian diet and vegetation data for Hakalau Forest, Hawaii, 2012-2016: U.S. Geological Survey data release,


This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. Specifically, this data set provides grass biomass data for plots where we implemented a grass removal/seed addition experiment in order to look at how these two factors relate to each other in limiting native plant [...]


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Grass Biomass in experimental plots, Hakalau Forest, Hawaii, 2015.xml
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In an attempt to jump-start succession in former cattle pastures, managers in Hawaii have planted native Acacia koa (koa) trees to create avian habitat, increase seed rain, reduce exotic grass biomass, and facilitate recruitment of a diverse understory. Restoration forests In Hakalau Forest National Wildlife Refuge, however, have not undergone secondary succession towards native dominated forest, instead maintaining a koa overstory with an exotic pasture grass understory. The objective of this study was to contrast the roles of top-down and bottom-up processes that influence the capacity for natural understory regeneration. These included feedbacks between bird-mediated seed rain and fruiting understory (top-down), as well as links between understory and microhabitats for native seed germination (bottom-up). The overarching goal was to find those constraints that are most important to address to help facilitate degraded forest sites naturally regenerating into intact forest sites. While most of this study was design around sampling natural patterns, in this particular experiment we focused on manipulating grass biomass and seed availability to specifically ask how these two factors relate to each other.

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