Impact of invasive alien plants Gutenbergia cordifolia and Tagetes minuta on native taxa in the Ngorongoro crater, Tanzania

Ngondya, Issakwisa B.

doi:10.1016/j.sciaf.2021.e00946

Cited by 5 publications

(5 citation statements)

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“…IAPs have been referred to as ecosystem engineers because of the alterations they bring about in the recipient environments (Perkins et al, 2011). In order to guarantee rangeland sustainability, food security, human wellbeing, and overall economic prosperity, it is crucial to stop the spread of AIPs (Ngondya & Munishi, 2021;Ojija & Manyanza, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, little has work been done in the country to identify dominant co-exiting native plants with P. hysterophorus that could be used to suppress the invasive by increasing their density following competition experiments. Therefore, identifying native plant species that co-exist with P. hysterophorus is critical for control and management of the invasive (Ammondt & Litton, 2012;Khan et al, 2013Khan et al, , 2013Ngondya & Munishi, 2021). This is because the dominant co-coexisting native plants can be used for the restoration of invaded habitats by maintaining their abundance, density, and/or diversity in the invaded habitats (Richardson et al, 2007;Weidlich et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Hence, there is a need to determine the native forage plant species that could be sowed in rangelands and/or grazing lands to benefit livestock and ecosystem. This may contribute to achieving African Union Agenda 2063 Goals 1, 3, and 4 and the Strategy for controlling IAPs in Africa (2021-2030) (Ngondya & Munishi, 2021).…”

Section: Introductionmentioning

confidence: 99%

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An Invasive Plant Parthenium hysterophorus Reduces Native Forage Cover

Ojija

Lutambi

2022

East Afr. j. environ. nat. resour.

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While some research has been conducted in sub–Saharan Africa on the alien invasive Parthenium hysterophorus, little work has assessed whether it is poses negative impact on native forages. A field survey was carried out to study the dominant co–existing plant species, and its impact on plant abundance, species, and native forage cover. We found that non–natives were the dominant co–existing plants with P. hysterophorus compared to natives. Plant species (r = -0.889, P = 0.043) and abundance (r = -0.968, P = 0.007) decreased with increasing invasive percent cover. Moreover, native forage plant (Brachiaria reptans; r = -0.922, P = 0.026), Cynodon dactylon; r = -0.972, P = 0.006, Digitaria milanjiana; r = -0.938, P = 0.018, and Indigofera spicata; r = -0.977, P = 0.004) percent cover decreased with increasing invasive percent cover. The study concludes that P. hysterophorus negatively affects plant diversity, and thus, should controlled.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Invasive Plant Parthenium hysterophorus Reduces Native Forage Cover

Ojija

Lutambi

2022

East Afr. j. environ. nat. resour.

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“…At the same time, increased rainfall variability is expected to lead to increased variation in the abundance of many key prey species for spotted hyenas (Moehlman et al, 2020). Climate change is also expected to affect the availability of suitable forage for herbivores by facilitating the spread of unpalatable invasive weeds during heavy rain events (Ngondya and Munishi, 2021;Nyarobi et al, 2022). Spotted hyenas are flexible in both their diet and hunting strategies (Hofer and East, 1993;Höner et al, 2002;Yirga et al, 2012) which should allow them to adjust to shifts in prey communities.…”

Section: Discussionmentioning

confidence: 99%

Effects of environmental change on population growth: monitoring time-varying carrying capacity in free-ranging spotted hyenas

Bailey,

Höner,

Davidian

et al. 2024

Preprint

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Trends in population sizes influence conservation decisions, but such trends can be misleading since a population can grow even as carrying capacity falls. Population growth requires population size to be below carrying capacity but is agnostic to trends in carrying capacity. We developed an approach to estimate time-varying carrying capacity (Kt), an integrative metric to monitor all environmental variables impacting vital rates in a population. We used individual-based modelling to quantify Kt for a recovering population of spotted hyenas and investigated whether population growth could be explained by recent environmental change. Population growth occurred despite no linear trend in Kt, suggesting that the observed growth is the lingering effect of past, rather than recent, environmental improvements. This study illustrates that recovery can occur at different time scales for the environment and for a population. Considering this demographic lag matters for the effective conservation of long-lived species.

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“…Expanding human population requires infrastructure development, often at the expense of natural habitat resulting in habitat isolation, degradation, and loss [13,14]. Some consequences of habitat loss and fragmentation to biodiversity include increase of unpalatable invasive plant species in PAs, and this has higher extinction risk [15], particularly of large herbivores. Moreover, habitat loss and fragmentation constrain animal dispersal, reducing the size available for subpopulation and the possibility of regular genetic exchange [16].…”

mentioning

confidence: 99%

Realizing UN decade on ecosystem restoration through a nature-based approach: A case review of management of biological invasions in protected areas

Ngondya

2022

PLOS Sustain Transform

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As the influx of different invasive species and their spread to new areas increases, there is a need for a rigorous and relevant scientific evidence-based control and restoration (EBCR) approaches to inform practical decisions and policymaking. While evidence-based decision is gaining popularity in science and policy, its potential for transformative change especially in the management of invasive plant species remains unexplored. Control and restoration of areas invaded by invasive plant species in natural and protected ecosystems require such decisions. Here, we provide a framework to guide how EBCR can contribute to transformative change and we argue that upscaling existing EBCR practices in areas invaded by invasive plant species (especially in protected areas (PAs)) requires coalitions of interdisciplinary science, public, private, and civil society actors with a common goal. Since actors’ roles and stakeholder interactions are dynamic, to achieve durable impacts, the upscaling process must continually engage and involve actors, while maintaining a balance of incentives among them. Social and cultural dimensions of local communities as well as their indigenous and local knowledge need to be incorporated. Pathways to upscaling EBCR may involve leveraging adaptive governance, integrating successful initiatives and lessons into public policy and practices, or reinforcing governance and management-led change with private efforts. We identify general lessons from (complex) PAs for successful upscaling of EBCR and illustrate the components of our framework through a novel application of a nature-based approach (NbA) in PAs invaded by invasive plant species.

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Impact of invasive alien plants Gutenbergia cordifolia and Tagetes minuta on native taxa in the Ngorongoro crater, Tanzania

Cited by 5 publications

References 38 publications

An Invasive Plant Parthenium hysterophorus Reduces Native Forage Cover

An Invasive Plant Parthenium hysterophorus Reduces Native Forage Cover

Effects of environmental change on population growth: monitoring time-varying carrying capacity in free-ranging spotted hyenas

Realizing UN decade on ecosystem restoration through a nature-based approach: A case review of management of biological invasions in protected areas

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