About rats and jackfruit trees: modeling the carrying capacity of a Brazilian Atlantic Forest spiny-rat Trinomys dimidiatus (Günther, 1877) – Rodentia, Echimyidae – population with varying jackfruit tree (Artocarpus heterophyllus L.) abundances

Mello, José Henrique Fortes; Moulton, Timothy P.; Raíces, Daniel Santana Lorenzo; Bergallo, Helena Godoy

doi:10.1590/1519-6984.11613

Cited by 12 publications

(8 citation statements)

References 42 publications

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“…This might be due to fruit density at the peak production period being 77 times higher than fruit density during the less intense fruit production period. Also, although the abundance of some rodent species, mainly T. dimidiatus, was higher in areas where jackfruit trees are present (Mello et al, 2015), there was no significant increase in this species density at the peak of fruit production. Consequently, when there are more food resources available at the peak of jackfruit production seed predation is lower.…”

Section: Discussionmentioning

confidence: 82%

Smile, you are on camera or in a live trap! The role of mammals in dispersion of jackfruit and native seeds in Ilha Grande State Park, Brazil

Raíces¹,

Ferreira²,

Mello³

et al. 2017

Nat. Cons. Res.

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The alien species Artocarpus heterophyllus, originally from India, was introduced to Brazil in the colonial period and has become invasive in some areas in the Atlantic Forest. Its fruits can weigh 35 kg and produce up to 500 seeds each. In their native range they are dispersed by turtles, rodents, monkeys, wild pigs and elephants. This study aimed to investigate the influence of mammals in jackfruit predation and seed dispersal, as well as the influence of jackfruit in native plant species dispersal by mammals, in the Ilha Grande State Park, Southeastern Brazil. Seeds with and without mesocarp were tied to thread spools and checked for predation and dispersion on 37 sites. We recorded mesocarp or jackfruit seed feeding on video. Six species of mammals were recorded feeding on jackfruit, but Trinomys dimidiatus, Didelphis aurita and Cuniculus paca accounted for 92% of all records. Cuniculus paca and Trinomys dimidiatus preyed and dispersed seeds while Didelphis aurita consumed mesocarp only. Seeds with mesocarp were more preyed on than seeds without mesocarp and its consumption was lower during more intense fruit production. Hence, jackfruit production can exceed the capacity of mammals to consume its seeds in areas where jackfruit density is high. Faeces of small mammals were collected in areas with (10 grids) and without jackfruits (8 grids) and analysed for the presence of native seeds. Twelve small mammal species were captured in areas with and without jackfruits, but faeces of 11 species were collected. Didelphis aurita dispersed proportionally more native seeds in area without jackfruits. Our results showed that mammals are playing a negative role helping to disperse jackfruit trees, and this is occurring in different ways depending on mammal species.

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Section: Discussionmentioning

confidence: 82%

Smile, you are on camera or in a live trap! The role of mammals in dispersion of jackfruit and native seeds in Ilha Grande State Park, Brazil

Raíces¹,

Ferreira²,

Mello³

et al. 2017

Nat. Cons. Res.

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“…There, the large fallen fruits were eagerly consumed by small mammals, such as the common marmoset (Callithrix jacchus L.; Callitrichidae) and coati (Nasua nasua L.; Procyonidae). This led to an increase in the dispersal and establishment of A. heterophyllus trees, and to the displacement of native tree species (Abreu and Rodrigues 2005;Mello et al, 2015). Local bird populations declined, as a result of the increased populations of marmoset and coati, which prey opportunistically on birds' eggs and chicks (Mello et al, 2015).…”

Section: Impactsmentioning

confidence: 99%

“…This led to an increase in the dispersal and establishment of A. heterophyllus trees, and to the displacement of native tree species (Abreu and Rodrigues 2005;Mello et al, 2015). Local bird populations declined, as a result of the increased populations of marmoset and coati, which prey opportunistically on birds' eggs and chicks (Mello et al, 2015). Jackfruit trees are also considered to be allelopathic (Perdomo and Magalhães, 2007).…”

Section: Impactsmentioning

confidence: 99%

Guide to the naturalized and invasive plants of Eastern Africa

Witt¹,

Luke²

2017

223

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Both in Ethiopia and in the countries of East Africa, the continuing proliferation and spread of invasive alien species (IAS) is now recognized as a serious problem, which needs to be addressed. While this situation has improved dramatically over the past 10 years, further progress has been hampered by the absence, hitherto, of a comprehensive IAS database for the region. Countries in the region have repeatedly expressed the need for such a database, as a tool to assist in the identification of naturalized and invasive alien plant species, and in understanding their impacts, both existing and potential, while also providing pointers on what can be done to manage such species. This information is seen as essential, not only in enabling countries to develop effective IAS management strategies, but also in helping them to meet their obligations under various international agreements and treaties, including Article 8 (h) of the Convention on Biological Diversity (CBD) and Target 9 of the 2020 Aichi Biodiversity Targets. In providing such a database, this Guide is intended to give the countries of eastern Africa the information they require, in order to be able to develop effective strategies for combating the growing menace posed by invasive alien plants. It is further hoped that this Guide will foster increased regional collaboration, in responding to the challenges of managing shared invasive plant species. The Guide is based on the findings of extensive roadside surveys, carried out throughout the region, and on a review of the literature pertaining to naturalization and/or invasiveness among alien plants in eastern Africa. By this means, scores of exotic plant species were found to have escaped from cultivation, and to have established populations in the 'wild', to the detriment of natural resources and the millions of people in the region who depend on these resources. Included in the Guide are descriptions of roughly 200 exotic plant species which are either invasive already or which are deemed to have the potential to become invasive in the region. The profiled species include aquatic invasive plants or waterweeds (seven species); vines, creepers or climbers (20 species); terrestrial herbs, shrubs, and succulents (more than 30 species of each), and trees (more than 60 species). Also profiled in this Guide are many exotic plant species which, although their current distribution in the region may still be relatively localized, nevertheless have the potential to become considerably more widespread and problematic. The wide range of habitats and climatic conditions found within Ethiopia and across East Africa make the region as a whole particularly prone to invasions by a host of introduced plant species. Such invasions are being facilitated by increased land degradation, especially through overgrazing and deforestation, and also by climate change.

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“…Studies developed by the Laboratory of Mammal Ecology (Universidade do Estado do Rio de Janeiro (UERJ)) at Ilha Grande State Park showed that the influence of the jackfruit tree has caused an increase in the abundance of some mammals (Mello et al, 2015); on the other hand, a decrease in native plant species seed dispersal by mammals (Raíces et al, 2017). In this scenario, making a decision to establish the control of jackfruit trees at Ilha Grande State Park is in compliance with Brazilian Federal Law 9.985/2000 that established the National System of Protected Areas that prohibit the introduction and presence of non-native species in protected areas.…”

Section: Introductionmentioning

confidence: 99%

Closing the Snack Bar: Developing Methods for Jackfruit Tree (Artocarpus heterophyllus Lamk.) Control in Brazil

et al. 2020

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There are several techniques for the control and removal of invasive species that can be applied, and there is a demand among restoration practitioners for plant control methods. This study compared two methods for the control of jackfruit tree: mechanical method of trunk girdling and chemical method of herbicide injection into the trunk. It was evaluated both methods in terms of effectiveness in 10 plots (80 × 80 m). For the chemical method, triclopyr in concentrations of 2%, 6% and 8% was used. The progress of treatments was evaluated accordingly for the phytosanitary conditions. Method of trunk girdling proved to be ineffective and it had a low mortality rate (12%). The proportion of dead trees by chemical treatment was 100%. The results showed that chemical control of jackfruit trees was much faster and more effective.

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About rats and jackfruit trees: modeling the carrying capacity of a Brazilian Atlantic Forest spiny-rat Trinomys dimidiatus (Günther, 1877) – Rodentia, Echimyidae – population with varying jackfruit tree (Artocarpus heterophyllus L.) abundances

Cited by 12 publications

References 42 publications

Smile, you are on camera or in a live trap! The role of mammals in dispersion of jackfruit and native seeds in Ilha Grande State Park, Brazil

Smile, you are on camera or in a live trap! The role of mammals in dispersion of jackfruit and native seeds in Ilha Grande State Park, Brazil

Guide to the naturalized and invasive plants of Eastern Africa

Closing the Snack Bar: Developing Methods for Jackfruit Tree (Artocarpus heterophyllus Lamk.) Control in Brazil

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