In search of Aliens: Factors influencing the distribution of Chromolaena odorata L. and Mikania micrantha Kunth in the Terai grasslands of Manas National Park, India

Nath, Anukul; Sinha, Alolika; Lahkar, Bibhuti P.; Brahma, Namita

doi:10.1016/j.ecoleng.2019.02.012

Cited by 35 publications

(24 citation statements)

References 55 publications

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“…These approaches have been effective in controlling C. odorata in Hluhluwe-iMfolozi National Park (te Beest et al 2017) and several other species in Kruger National Park of South Africa (Foxcroft & Freitag-Ronaldson 2007). The occurrence of IAPS in PAs is governed by multiple factors related to human activities, such as tourism, road transportation and other anthropogenic disturbances, as well as natural landscape structures such as rivers (Foxcroft et al 2011, Anderson et al 2015, Nath et al 2019. In BNP, the occurrence of IAPS was significantly related to tree canopy cover and the distance to rivers, settlements and roads.…”

Section: Environmental Conservationmentioning

confidence: 99%

“…Human structures such as roads function as movement corridors and road verges provide suitable habitats for the establishment of IAPS (Christen & Matlack 2009, Mortensen et al 2009, especially with low tree canopy cover compared with adjacent forests. Roads have significantly influenced the occurrence of C. odorata and M. micrantha in Manas National Park of India (Nath et al 2019). Thus, the highway and other roads passing across BNP might have increased propagule pressure, leading to the recent increase in the number of IAPS.…”

Section: Environmental Conservationmentioning

confidence: 99%

“…Activities related to tourism often increase alien species' propagule pressure, resulting in a high abundance and richness of alien species in regions with high tourist activities (Anderson et al 2015). Proximity to road and human settlements, together with other factors, also significantly affect the occurrence of Invasive alien plant species (IAPS) (Nath et al 2019). Furthermore, natural landscape structures such as rivers serve as dispersal corridors for alien species between PAs and the surrounding landscape (Foxcroft et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Distribution and impact of invasive alien plant species in Bardia National Park, western Nepal

2020

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Summary Invasive alien plant species (IAPS) are spreading into protected areas worldwide; however, knowledge of these invasions and their impacts in Nepal’s protected areas is poor. Here, the spatial distribution pattern of IAPS in Bardia National Park (BNP), Nepal, was analysed using roadside surveys and grid sampling. The impacts of the most abundant IAPS, Lantana camara, on plant communities were analysed by comparing 60 pairs of non-invaded and invaded quadrats. Twelve IAPS, including two of the most prolific species globally, L. camara and Chromolaena odorata, were recorded from BNP. The Karnali floodplain in the south-western region of the park, a prime habitat of one-horned rhinoceros, was highly invaded by the IAPS. Tree canopy and distance to road, river and settlement were the major factors affecting IAPS occurrence. Lantana camara modified plant community structure and significantly reduced plant species richness and diversity; species richness of native plants was reduced to less than half in invaded plots. Plant invasions and impacts on native plant diversity have been increasing in BNP. We recommend management interventions involving immediate eradication of C. odorata and other species with single satellite populations and control measures for other widespread species such as L. camara and Ageratum houstonianum.

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Section: Environmental Conservationmentioning

confidence: 99%

Section: Environmental Conservationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distribution and impact of invasive alien plant species in Bardia National Park, western Nepal

2020

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“…On the one hand, regular burning rejuvenate vegetation and promote regeneration of attractive new grass shoots few months ahead of the rainy season, when animals might look for alternative marginal habitats such as forest or creeks for complementary feeding purposes. On the other hand, previous observation suggest that regular fire could promote Siam weed expansion(Nath et al 2019), which is indeed rapidly spreading on the study site. Like other grazing herbivores (Rozen-Rechels et al 2017), tamaraw avoid this invasive plant, an issue that could ultimately decrease the CMZ carrying capacity(Dumalisile & Somers 2017).…”

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confidence: 56%

Cast away on Mindoro island: lack of space limits population growth of the endangered tamaraw (Bubalus mindorensis)

Bonenfant

Rutschmann

Burton

et al. 2020

Preprint

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Endangered species, despite living at low population density, may undergo 2 density-dependent feed-backs in case of successful recovery or marked reduction in range. When at work, density-dependence dynamics increases extinction risks 4 and hamper conservation efforts. The last population of the critically endangered tamaraw (Bubalus mindorensis) lives on a < 3, 000ha in Mounts Iglit-Baco 6 Natural Park (MIBNP) with very limited expansion possibilities. Tamaraw abundance has been monitored on a yearly basis from animal counts by 8 Philippine authorities since the year 2000. Consistent with its protected status by law, the MIBNP tamaraw population has been increasing in size at an average 10 rate of +6% per year, which we found to be relatively low compared to other similar-sized Bovinea species. Population growth was strikingly spatially 12 structured within MIBNP with a population growth close to +16% in the core area of protection, while a reduction of abundance of −27% was measured at the 14 periphery of the species range inside MIBNP. Highly concerning is the fact that the annual population growth rate progressively decreased significantly over the 16 years since 2008, which we interpreted as an evidence of density-dependence. This isolated tamaraw population is currently experiencing a contraction of its 18 range at MIBNP, likely caused by anthropogenic pressures forcing large herbivores to live at relatively high density in the core zone of the monitoring 20 where protection is most effective. Our study highlights that beyond the encouraging results of a continuous growth over the last two decades, the 22 MIBNP tamaraw population remains subject to uncertainty of its long term viability. 24 14 is a decrease of the population growth at low population abundance (i.e. demographic component, see Stephens et al. (1999)). On the other hand, 16 classical density-dependent effects, the decrease of the population growth rate with density (Nicholson 1933), on population dynamics are often overlooked in 18 conservation because they are a priori expected to occur at high population abundance. Increasing density in populations of endangered species may, 20 however, occur incidentally following a range reduction caused by habitat loss or successful protection measures, and in turn triggers undesirable ecological 22 consequences for its conservation.Density-dependence is a pervasive demographic responses among large

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“…Currently, monitoring M. micrantha mainly relied on manual inspection, which is labor intensive and inefficient (Day et al, 2012;Nath et al, 2019). Hyperspectral remote sensing is an efficient monitoring method that has been successfully used to monitor many alien invasive plants (Calvino-Cancela et al, 2014;Sabat-Tomala et al, 2020) and has shown great potential (Chance et al, 2016;Marcinkowska-Ochtyra et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral Imaging for Identification of an Invasive Plant Mikania micrantha Kunth

Huang

Yang

et al. 2021

Front. Plant Sci.

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Mile-a-minute weed (Mikania micrantha Kunth) is considered as one of top 100 most dangerous invasive species in the world. A fast and accurate detection technology will be needed to identify M. micrantha. It will help to mitigate the extensive ecologic and economic damage on our ecosystems caused by this alien plant. Hyperspectral technology fulfills the above requirement. However, when working with hyperspectral images, preprocessing, dimension reduction, and classifier are fundamental to achieving reliable recognition accuracy and efficiency. The spectral data of M. micrantha were collected using hyperspectral imaging in the spectral range of 450–998 nm. A different combination of preprocessing methods, principal component analysis (for dimension reduction), and three classifiers were used to analyze the collected hyperspectral images. The results showed that a combination of Savitzky-Golay (SG) smoothing, principal component analysis (PCA), and random forest (RF) achieved an accuracy (A) of 88.71%, an average accuracy (AA) of 88.68%, and a Kappa of 0.7740 with an execution time of 9.647 ms. In contrast, the combination of SG, PCA and a support vector machine (SVM) resulted in a weaker performance in terms of A (84.68%), AA(84.66%), and Kappa (0.6934), but with less execution time (1.318 ms). According to the requirements for specific identification accuracy and time cost, SG-PCA-RF and SG-PCA-SVM might represent two promising methods for recognizing M. micrantha in the wild.

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In search of Aliens: Factors influencing the distribution of Chromolaena odorata L. and Mikania micrantha Kunth in the Terai grasslands of Manas National Park, India

Cited by 35 publications

References 55 publications

Distribution and impact of invasive alien plant species in Bardia National Park, western Nepal

Distribution and impact of invasive alien plant species in Bardia National Park, western Nepal

Cast away on Mindoro island: lack of space limits population growth of the endangered tamaraw (Bubalus mindorensis)

Hyperspectral Imaging for Identification of an Invasive Plant Mikania micrantha Kunth

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