Impacts of the invasive exotic Prosopis juliflora (Sw.) D.C. on the native flora and soils of the UAE

El‐Keblawy, Ali; Al-Rawai, Awatif

doi:10.1007/s11258-006-9188-2

Cited by 108 publications

(85 citation statements)

References 39 publications

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“…Moreover, it has already infested large tracts of land in the industrial and residential areas. The same trend was reported in other countries by El-Keblawy and Al-Rawai [8] , Rout and Callaway [9] . ), Inderjit et al [10] .…”

Section: Introductionsupporting

confidence: 85%

Studies on Seed Germination and Seedling Emergence of Mesquite, Prosopis juliflora (Swartz) DC. in Sudan Gezira

Morgan¹,

Hamdoun²,

Bashir³

2017

ujar

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Mesquite, Prosopis juliflora (Swartz) DC, was introduced in many semi-arid areas of Sudan to combat desertification and provide fuel wood and fodder. However, it spread rapidly into fertile, productive areas, and irrigation and drainage channels, particularly in some of the major irrigated schemes. Nursery experiments were conducted at the Faculty of Agricultural Sciences, University of Gezira, Wad Medani, Sudan, to investigate water uptake by seeds, germination-rate, sowing depth, acid scarification and animal feeding of intact pods on germination and seedling emergence. Pods were collected from town, or the National Tree Seed Center laboratory. Seeds were used immediately after extraction. Petri-dishes with filter paper or plastic pots were used. Treatments were arranged in CRB design, with 4-6 replicates. Data were subjected to ANOVA and DMRT. The results revealed that the seeds have high ability to absorb water and exhibited high rate of germination, especially in the second wk after sowing (96%). Seeds placed on the soil surface failed to germinate, while those buried at depths of 2.5, 5, 7.5 and 10 cm displayed 100, 75, 60 and 40% germination, respectively. Seedling emergence was delayed by deep burial and amounted to 100 and 50% at depth of 2.5 and 5cm, respectively. Seeds germinated and seedlings have emerged at high rates (100%), when treated with sulfuric acid (60%v/v) for 5 min. they germinated and seedlings emerged normally, when extracted from sheep droppings.

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Section: Introductionsupporting

confidence: 85%

Studies on Seed Germination and Seedling Emergence of Mesquite, Prosopis juliflora (Swartz) DC. in Sudan Gezira

Morgan¹,

Hamdoun²,

Bashir³

2017

ujar

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“…Prosopis juliflora (mesquite), a native of Central and South America, has rapidly extended its global range and eliminates native residents in the invaded range. P. juliflora is a fast-growing tree species which resprouts easily, and has a strong adverse impact on native flora and soil properties (Sharma and Dakshini 1998;El-Keblawy and Al-Rawai 2007). Also, the leaf leachates and extracts of P. juliflora show allelopathic effects against native species in its invaded range but extracts from leaves of P. cineraria, a native of the Indian subcontinent, collected and applied in the same way, do not (Goel et al 1989).…”

Section: Congeneric Comparisonsmentioning

confidence: 99%

Allelopathy and plant invasions: traditional, congeneric, and bio-geographical approaches

et al. 2008

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A relatively small subset of exotic plant species competitively exclude their neighbors in invaded ''recipient'' communities but coexist with neighbors in their native habitat. Allelopathy has been argued as one of the mechanisms by which such exotics may become successful invaders. Three approaches have been used to examine allelopathy as a mechanism for invasion. The traditional approach examines exotic invasives in the same way that other native plants also suspected of allelopathic activities are studied. In this approach dose, fate, and replenishment of chemicals can provide powerful evidence for allelopathic processes. The bio-geographical approach often does not provide as much mechanistic evidence for allelopathy, but comparing the allelopathic effects of exotic invasives on species from their native and invaded communities yields stronger evidence than the traditional approach for whether or not allelopathy actually contributes to invasive success. The congeneric, or phylogenetic, approach involves comparative studies of exotic species with natives in the same genus or that are as closely related as possible. Congeneric approaches are limited in inference and have been used to study the role of natural enemies in exotic invasion, but this approach has not been widely used to study allelopathy and invasion. We discuss these three approaches and present a data set for congeneric Lantana and Prosopis to illustrate how the congeneric approach can be used, and use Centaurea maculosa and (±)-catechin to demonstrate experimentally how traditional and bio-geographic approaches can be integrated to shed light on allelopathy in exotic plant invasions.

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“…Competition is considered as one of the major forces determining the distribution and abundance of plant species and the composition and structure of plant communities (Gopal & Goel, 1993;Tilman, 2000). When induced by exotic species, competition can influence plant communities by affecting species composition, densities, diversity, and richness (Bazzaz, 1990;El-Keblawy & Al-Rawal, 2007). Competition between plants mainly occurs for resources such as nutrients, light, water, space, and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Competition between invasive Lemna minuta and native L. minor in indoor and field experiments

Gérard

Triest

2016

Hydrobiologia

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The invasion of aquatic ecosystems by introduced invasive alien species (IAS) has become a worldwide phenomenon, and often leads to competitive interactions with native species. At high-nutrient levels, native species mostly are outcompeted by the introduced species. We performed an outdoor competition experiment between IAS free-floating Lemna minuta and native Lemna minor in a eutrophicated pond to examine whether the invasive species is the better competitor. We additionally performed an indoor experiment resembling mesotrophic phosphorus (P) conditions to investigate both species' competitiveness in low P availability and compared with previous experiments at high-nutrient levels. Our results showed that in field conditions, the alien L. minuta was the better competitor. In the mesotrophic indoor condition, however, the native L. minor was the better competitor. Both species produced longer roots in the indoor experiment compared to field conditions. The species' relative growth rates were also lower in the indoor experiment. A P reduction to mesotrophic condition in the water column thus might reduce invasive L. minuta growth and competitive performance. Additionally, introduction and recovery of L. minor could reduce L. minuta cover, but only following P reduction. Field experiments in mesotrophic ponds are needed to confirm these indoor findings.

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Impacts of the invasive exotic Prosopis juliflora (Sw.) D.C. on the native flora and soils of the UAE

Cited by 108 publications

References 39 publications

Studies on Seed Germination and Seedling Emergence of Mesquite, Prosopis juliflora (Swartz) DC. in Sudan Gezira

Studies on Seed Germination and Seedling Emergence of Mesquite, Prosopis juliflora (Swartz) DC. in Sudan Gezira

Allelopathy and plant invasions: traditional, congeneric, and bio-geographical approaches

Competition between invasive Lemna minuta and native L. minor in indoor and field experiments

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