Unique Reintroduction Considerations in Hawaii: Case Studies from a Decade of Rare Plant Restoration at the Oahu Army Natural Resource Rare Plant Program

Kawelo, H. Kapua; Harbin, Susan Ching; Joe, Stephanie M.; Keir, Matthew; Weisenberger, Lauren

doi:10.5822/978-1-61091-183-2_12

Cited by 9 publications

(11 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar to previous research, we found that alterations in interannual precipitation had a substantially greater effect on plant dynamics than seedling herbivory (Figure ). We note that the data used to simulate the effect of herbivory pressure on S. obovata vital rates and plant dynamics came from a manipulative field experiment that was conducted in close proximity to our study site (Kawelo et al., ). Thus, it is reasonable to assume that our models capture an approximant estimate of herbivory pressure at our field site.…”

Section: Discussionmentioning

confidence: 99%

“…Site selection of the reintroduction was based on the following criteria: (1) appropriate habitat and associated species, (2) similar topography as naturally occurring populations and, (3) geographical proximity to naturally occurring S. obovata individuals (Garrison, US Army ). Genetic stock from the other six known populations was not used for the Kahanahaiki reintroduction to avoid potential outbreeding depression and the loss of localized adaptations (Kawelo, Harbin, Joe, Keir, & Weisenberger, ). That decision was partially supported by recent research that examined the risk of inbreeding and outbreeding depression of mixed founder stock (Weisenberger, ).…”

Section: Methodsmentioning

confidence: 99%

“…To evaluate the effects of mollusk herbivory on the survival, growth, and fertility of S. obovata, we used a combination of field experiments. The effect of mollusk herbivory on seedling survival came from a field experiment that was conducted in close proximity to our study site (Kawelo et al., ). In that study, S. obovata seeds were sown on the top layer of soil in 12 plots, 15 m × 15 m in diameter.…”

Section: Methodsmentioning

confidence: 99%

“…The proportional decrease in seedling survival

s (x, a, b)

of the survival‐growth function

p (y, x, a, b)

that we used for the high herbivory models (HP‐HH and LP‐HH) was based on the results reported in Kawelo et al. ().…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Low interannual precipitation has a greater negative effect than seedling herbivory on the population dynamics of a short‐lived shrub, Schiedea obovata

Bialic‐Murphy

Gaoue

2017

Ecology and Evolution

View full text Add to dashboard Cite

Climate projections forecast more extreme interannual climate variability over time, with an increase in the severity and duration of extreme drought and rainfall events. Based on bioclimatic envelope models, it is projected that changing precipitation patterns will drastically alter the spatial distributions and density of plants and be a primary driver of biodiversity loss. However, many other underlying mechanisms can impact plant vital rates (i.e., survival, growth, and reproduction) and population dynamics. In this study, we developed a size‐dependent integral projection model (IPM) to evaluate how interannual precipitation and mollusk herbivory influence the dynamics of a Hawaii endemic short‐lived shrub, Schiedea obovata (Caryophyllaceae). Assessing how wet season precipitation effects population dynamics it critical, as it is the timeframe when most of the foliar growth occurs, plants flower and fruit, and seedlings establish. Temporal variation in wet season precipitation had a greater effect than mollusk herbivory on S. obovata population growth rate normalλ, and the impact of interannual precipitation on vital rates shifted across plant ontogeny. Furthermore, wet season precipitation influenced multiple vital rates in contrasting ways and the effect of precipitation on the survival of larger vegetative and reproductively mature individuals contributed the most to variation in the population growth rate. Among all combination of wet season precipitation and herbivory intensities, the only scenario that led to a growing population was when high wet precipitation was associated with low herbivory. Our study highlights the importance of evaluating how abiotic factors and plant–consumer interactions influence an organism across its life cycle to fully understand the underpinning mechanisms that structure its spatial and temporal distribution and abundance. Our results also illustrate that for short‐lived species, like S. obovata, seedling herbivory can have less of an effect on the dynamics of plant populations than decreased interannual precipitation.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The proportional decrease in seedling survival

s (x, a, b)

of the survival‐growth function

p (y, x, a, b)

that we used for the high herbivory models (HP‐HH and LP‐HH) was based on the results reported in Kawelo et al. ().…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Low interannual precipitation has a greater negative effect than seedling herbivory on the population dynamics of a short‐lived shrub, Schiedea obovata

Bialic‐Murphy

Gaoue

2017

Ecology and Evolution

View full text Add to dashboard Cite

show abstract

“…Over the years, OANRP successfully protected some species, such as the endangered palm P. kaalae, using the dual method. Prior to rat control, there was no naturally occurring recruitment of P. kaalae; now there are carpets of seedlings and over 1,000 immature plants (Kawelo et al 2012). The baiting grids were typically maintained at 2-to 6-week intervals.…”

Section: Small-scale Bait Station Grids With Rat Trapsmentioning

confidence: 99%

The Oahu Army Natural Resources Program Adaptive Rat Control Strategy: Protecting Endangered Hawaiian Species

Katie¹

2014

vertebrate_pest_conference

View full text Add to dashboard Cite

Since 1995 the Oahu Army Natural Resources Program (OANRP) has managed over 60 federally endangered Hawaiian species, including plants, invertebrates, and one forest bird. An adaptive rodent control program is essential for the stabilization of many of these species. OANRP has utilized and experimented with various rodent control methods in remote settings on Oahu, including using small grids of bait stations containing rodenticide coupled with snap traps; deploying small grids of snap traps only; constructing predator-proof fence exclosures; and maintaining large-scale grids of snap traps for ecosystem-wide protection. In 2012, the program began to phase out the use of rodenticide in bait stations and transitioned to using kill-traps only, including the use of automatically self-resetting rat traps. To gauge the effectiveness of rat control methods, resources are monitored for changes in rat predation. Rat activity (both black rats and Polynesian rats) is also monitored with tracking tunnels inside and outside of management areas. This study discusses rat control and monitoring methods utilized by OANRP in the past and present. It also reviews investigations into the use of automatic rat traps, the transition to using kill-traps only instead of bait station grids, and highlight some strengths and weaknesses of various rat control methods. OANRP is working towards integrating multiple control methods for adaptive management in an effort to determine the most effective means to control rats in Armymanaged areas on Oahu. Proc. 26 th Vertebr. Pest Conf. (R. M. Timm and J. M. O'Brien, Eds.) Published at Univ. of Calif., Davis. 2014. Pp. 26-31.

show abstract

Using Transfer Function Analysis to develop biologically and economically efficient restoration strategies

Bialic‐Murphy

Gaoue

Knight

2018

Sci Rep

View full text Add to dashboard Cite

Rare species across taxonomic groups and biomes commonly suffer from multiple threats and require intensive restoration, including population reintroduction and threat control. Following reintroduction, it is necessary to identify what level of threat control is needed for species to persist over time. Population reintroduction and threat control are time intensive and costly. Thus, it is pragmatic to develop economically efficient restoration strategies. We combined transfer function analysis and economic cost analysis to evaluate the effects of biologically meaningful increases in demographic processes on the persistence of a reintroduced population of a Hawaii endemic long-lived shrub, Delissea waianaeensis. We show that an increase in fertility by 0.419 following the suppression of non-native rodents or an increase by 0.098 in seedling growth following the suppression of invasive molluscs would stabilize the population (i.e., λ = 1). Though a greater increase in fertility than seedling growth was needed for the reintroduced population to persist over time, increasing fertility by suppressing rodents was the most cost effective restoration strategy. Our study emphasizes the importance of considering the effects of large increases in plant vital rates in population projections and incorporating the economic cost of management actions in demographic models when developing restoration plans for endangered species.

show abstract

Unique Reintroduction Considerations in Hawaii: Case Studies from a Decade of Rare Plant Restoration at the Oahu Army Natural Resource Rare Plant Program

Cited by 9 publications

References 26 publications

Low interannual precipitation has a greater negative effect than seedling herbivory on the population dynamics of a short‐lived shrub, Schiedea obovata

Low interannual precipitation has a greater negative effect than seedling herbivory on the population dynamics of a short‐lived shrub, Schiedea obovata

The Oahu Army Natural Resources Program Adaptive Rat Control Strategy: Protecting Endangered Hawaiian Species

Using Transfer Function Analysis to develop biologically and economically efficient restoration strategies

Contact Info

Product

Resources

About