Geographic differentiation of management objectives for invasive species: a case study of Hymenachne amplexicaulis in Australia

Grice, A. C.; Clarkson, John R.; Calvert, Moya

doi:10.1016/j.envsci.2011.07.006

Cited by 34 publications

(44 citation statements)

References 10 publications

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“…Both P. juliflora and L. camara have become widely established in Eastern Africa, necessitating a spatially explicit management strategy that ensures concerted communication and management across national and subnational borders and sets different control objectives for areas with different invasion levels (Grice et al. , Terblanche et al. , Shackleton et al.…”

Section: Discussionmentioning

confidence: 99%

“…In an attempt to spatially delineate different regions in Australia necessitating different approaches to managing the invasive plant Hymenachne amplexicaulis (Rudge) Nees, Grice et al. () distinguished between low‐ and high‐risk prevention zones. Similarly, areas close to the invasion front in northern Tanzania should be declared as high‐risk prevention zones that require several prevention measures.…”

Section: Discussionmentioning

confidence: 99%

“…Rather, it should be managed according to a spatially explicit management strategy that sets different control objectives for areas with different invasion levels (Grice et al. , Terblanche et al. , Shackleton et al.…”

Section: Introductionmentioning

confidence: 99%

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Niche change analysis as a tool to inform management of two invasive species in Eastern Africa

et al. 2020

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Significant progress has been made in providing guidelines and recommendations for assessing the ecological niche, stage of invasion, and probability of invasive alien plant species (IAPS) potential distribution in space and time. We followed these recommendations by developing and comparing ordination and species distribution models (SDMs) of two important woody IAPS in Eastern Africa, Prosopis juliflora and Lantana camara, and interpreting the results to inform IAPS management. The two species differ in their invasion history in Eastern Africa; while L. camara was widely introduced there in the 19th century, P. juliflora was only planted at selected locations in the 1970s and 1980s. For the SDMs, machine learning algorithms were used to generate one ensemble model each for P. juliflora and L. camara. For ordination, we used bioclimatic variables, performed a principal component analysis, and compared the native and global niches of the species with the Eastern African niche. Niches varied substantially depending on the percentage of marginal climates excluded from the models. Additional analysis of the local niches surrounding the original P. juliflora plantations showed that they are complementary, which may have led to an overestimation of regional niche filling. While niche expansion was absent or small depending on the percentage of marginal climates excluded, analysis of the stages of invasion suggested that P. juliflora may have started to adapt to novel climatic conditions and that L. camara is approaching a pseudo‐stable equilibrium in Eastern Africa. The SDMs showed that large areas in Eastern Africa that have not yet been invaded by P. juliflora are suitable or will become suitable with climate change. For L. camara, the global SDM predicted a considerably larger suitable area than the Eastern African one, raising uncertainty about the areas to be included in a regional management strategy. Thus, combining ordination and SDMs and integrating a geographic component into ordination is useful in assessing IAPS invasion stages and potential niche shifts, and the results help inform IAPS policy and management. The combined approach can also serve to guide experimental studies addressing divergences between results generated with the different approaches.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Niche change analysis as a tool to inform management of two invasive species in Eastern Africa

et al. 2020

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“…Management strategies should be based on given circumstances and the total costs required and following that specific management zones should be identified (Grice et al ., ). Providing a framework to classify invaded areas is an important step for refining management strategies pertaining to invasive species (Grice et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Eradication of feral goats enhances expansion of the invasive shrub Leucaena leucocephala on Nakoudo‐jima, an oceanic island

2016

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Many introduced species can co-exist within the same ecosystem and sometimes interact with each other. Under such situations, eradication of one species may cause unexpected negative effects. Nakoudo-jima in the Ogasawara (Bonin) Islands is an oceanic island that had feral goats that were introduced in the 1880s, but eradicated in 1999. Following their eradication, the alien invasive shrub Leucaena leucocephala (Fabaceae) was predicted to increase drastically. In this study, we tested the hypothesis that the eradication of feral goats enhanced the expansion of L. leucocephala using four time-series aerial photographs and validation work based on current field surveys of Nakoudojima. Our results showed that following feral goat elimination, bare ground areas decreased and forest cover increased. This was particularly true of areas dominated by L. leucocephala. Thus, feral goats appear to have limited the expansion of L. leucocephala on Nakoudo-jima. Grassland cover also increased following feral goat elimination, but this may have occurred prior to L. leucocephala expansion. These results suggest that L. leucocephala-dominated forest might invade grassland areas and that grasslands may have mediated the expansion of L. leucocephala after feral goat elimination. Future management of L. leucocephala should target the species in the high-risk expansion zones adjacent to grasslands.

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“…The efficacy of management strategies at suppressing invasion depends on both the life history of the species and environmental context (Grice, Clarkson, & Calvert, 2011); thus, understanding the ecology of a species and its environment is critical for effective management. Bogich and Shea (2008) used a metapopulation framework to demonstrate that optimal management strategies can vary geographically in the gypsy moth based on patch sizes and colonization rates, but did not consider Allee effects.…”

Section: Discussionmentioning

confidence: 99%

Management of invasive Allee species

Chan

Kent

Johnson

2017

Letters in Biomathematics

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In this study, we use a discrete, two-patch population model of an Allee species to examine different methods in managing invasions. We first analytically examine the model to show the presence of the strong Allee effect, and then we numerically explore the model to test the effectiveness of different management strategies. As expected invasion is facilitated by lower Allee thresholds, greater carrying capacities and greater proportions of dispersers. These effects are interacting, however, and moderated by population growth rate. Using the gypsy moth as an example species, we demonstrate that the effectiveness of different invasion management strategies is contextdependent, combining complementary methods may be preferable, and the preferred strategy may differ geographically. Specifically, we find methods for restricting movement to be more effective in areas of contiguous habitat and high Allee thresholds, where methods involving mating disruptions and raising Allee thresholds are more effective in areas of high habitat fragmentation. ARTICLE HISTORY

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Geographic differentiation of management objectives for invasive species: a case study of Hymenachne amplexicaulis in Australia

Cited by 34 publications

References 10 publications

Niche change analysis as a tool to inform management of two invasive species in Eastern Africa

Niche change analysis as a tool to inform management of two invasive species in Eastern Africa

Eradication of feral goats enhances expansion of the invasive shrub Leucaena leucocephala on Nakoudo‐jima, an oceanic island

Management of invasive Allee species

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