scholarly journals Chloris gayana (Rhodes grass).

Author(s):  
Julissa Rojas-Sandoval

Abstract Chloris gayana is a robust, strongly stoloniferous grass native to Africa that has been extensively introduced as forage across tropical and subtropical regions. Traits such as its ability to grow in a wide range of environmental conditions, its drought-resistance and its ability to rapidly reproduce both by seeds and vegetatively have facilitated its escape from cultivation and subsequent naturalization. Once established, C. gayana often grows to form almost pure stands that smother native species. Currently, this species is regarded as an invasive in Australia, Spain, Argentina, Paraguay, Mexico, Costa Rica, Cuba, Anguilla, New Caledonia, New Zealand and Hawaii. It is also included in the Global Compendium of Weeds.

2021 ◽  
Author(s):  
D. Suckling

Abstract E. postvittana is a small, bell-shaped moth, whose caterpillars feed on a very wide range of plants. The eggs, larvae and pupae can be associated with plant material and readily transported. The pest status of this insect in horticultural crops is very significant. It is native to Australia and was distributed to New Zealand, Hawaii, New Caledonia and the UK with apples [Malus domestica] or other plant material in the late 1800s. It has since spread throughout lowland New Zealand, and in recent years has spread through southern parts of the UK, and Ireland. In Hawaii, it appears to be confined to altitudes above 1100 m, and can largely be considered a pest of temperate regions.


2020 ◽  
Author(s):  
Jeanine Vélez-Gavilán

Abstract Paspalum dilatatum is a perennial grass native to South America that has been introduced into tropical and subtropical areas as a forage species/fodder. It is reported as invasive in Japan, Malaysia, Taiwan, Vietnam, Indonesia, Philippines, Hawaii, American Samoa, Australia, Fiji, French Polynesia, New Caledonia, New Zealand, Niue, Norfolk Island, Solomon Islands and the Minor Outlying Islands. In Hawaii and New Zealand, it forms dense stands that smother and prevent recruitment of native species.


2021 ◽  
Author(s):  
Julissa Rojas-Sandoval

Abstract F. convolvulus is a weedy species of gardens, cultivated fields, open habitats, orchards, non-crop areas, waste areas, and disturbed sites. It is well-adapted to a wide range of climatic conditions and soils. This species is a prolific seed producer and has the potential to produce up to 30,000 seeds/plant. Seeds can be dispersed by farm machinery, and water. It is also a common contaminant of wheat and other cereal crops. F. convolvulus is often a serious weed in cereals, vegetables and horticultural crops (FAO, 2015). Currently, it is listed as invasive in the Dominican Republic, Cuba, Australia, New Caledonia, and New Zealand (Webb et al., 1988; MacKee, 1994; Wilson, 2008; Acevedo-Rodriguez and Strong, 2012), but it is also ranked as a serious weed in 20 crops in more than 41 countries around the world (Holm et al., 1991). Distribution.


Author(s):  

Abstract A new distribution map is provided for Listroderes costirostris Schönh. (obliquus Klug) (Col., Curculionidae) (Vegetable Weevil). Hosts: Wide range of vegetables and weeds. Information is given on the geographical distribution in ASIA, Japan, AFRICA, Republic of South Africa, AUSTRALASIA and PACIFIC ISLANDS, Australia, Hawaii, New Caledonia, New Zealand, Norfolk Island, NORTH AMERICA, U.S.A., SOUTH AMERICA, Argentina, Bolivia, Brazil, Chile, Uruguay, Venezuela.


2020 ◽  
Author(s):  
Julissa Rojas-Sandoval

Abstract As many other species within the genus Emilia, E. coccinea is herb that behaves as an environmental and agricultural weed. This fast-growing herb has the potential to rapidly colonize disturbed areas, waste grounds, gardens, forest edges, pastures, active and abandoned cultivated lands, roadsides, dry thickets and riverbanks. This species is adapted to grow in a wide range of environmental conditions and has wind-dispersed seeds, which are features that may facilitate its spread into new habitats. It is listed as invasive in Hawaii, Dominican Republic and New Caledonia.


2021 ◽  
Author(s):  
◽  
Daniel Francis McNaughtan

<p>The brown alga Colpomenia bullosa was first observed in New Zealand more than 20 years ago, yet very little is known about its current intertidal distribution or possible effects it may be having on native communities. This study addresses some of these issues. Surveys indicate little spatial variation in abundance around the Wellington region, however, the sporophytic crustose phase is restricted to pools high in the littoral zone while the gametophytic upright has a low- to sub-littoral distribution. Physiology experiments indicate that C. bullosa can tolerate a wide range of environmental conditions, but the crustose phase has a poor desiccation tolerance. A series of tranplant and competition experiments confirmed this and suggested that the crustose phase requires some level of facilitation by molluscan herbivores in order to become established. These experiments also revealed that crustose C. bullosa does not compete well against more upright macroalgal species. The effects of this introduced algae on native communities are likely to be minimal given its restricted intertidal distribution and its inability to compete against more upright species.</p>


2020 ◽  
Author(s):  
Julissa Rojas-Sandoval

Abstract Crocosmia × crocosmiiflora has been widely cultivated as an ornamental and has escaped from cultivation to become invasive in disturbed sites, riverbanks, wasteland, along roadsides, and shrublands (Ensbey et al., 2011; Weeds of Australia, 2016, Weeds of New Zealand, 2016). This species is well adapted to grow in a wide range of environmental conditions and soil types (it may grow in any soil, wet or dry, poor or rich). It competes aggressively with native vegetation for resources such as water and nutrients and it has the potential to displace native vegetation primarily in riparian areas and moist shrublands. Once established, it moves rapidly down watercourses into natural forests. The mass of corms in the soil contributes to the breakdown and erosion of natural creek and riverbanks (Ensbey et al., 2011; Weeds of the Blue Mountains, 2016).


2020 ◽  
Author(s):  
Julissa Rojas-Sandoval ◽  
Duilio Iamonico

Abstract A. americana is a large, rhizomatous succulent that grows in a wide range of habitats and soil types. Additionally, it is tolerant to salt spray, high temperatures, and extreme drought. Because this species spread by seeds, but also vegetatively by bulbils and rhizomes, it has the potential to escape from cultivation and rapidly colonize disturbed sites, roadsides, bare sand and coastal areas (ISSG, 2016). Currently, A. americana is considered a serious environmental weed by the IUCN (ISSG, 2016) and it is listed as invasive in many countries in Europe as well as in China, Japan, South Africa, Namibia, Tanzania, Bermuda, Australia, New Zealand, and New Caledonia among others (BioNET-EAFRINET, 2016; ISSG, 2016; DAISIE, 2016; PIER, 2016; Weeds of Australia, 2016). It is also known to have become invasive in Ethiopia, Kenya, Malawi, Rwanda, and Uganda.


2017 ◽  
Vol 29 (10) ◽  
pp. 1883
Author(s):  
L. K. Akison ◽  
P. H. Andraweera ◽  
M. J. Bertoldo ◽  
H. M. Brown ◽  
J. S. M. Cuffe ◽  
...  

Because reproduction is essential for all life, it is central to our understanding of all aspects of biology. The Society for Reproductive Biology (SRB) 2016 conference held on the Gold Coast (Qld, Australia) displayed the current breadth of reproductive research in Australia and New Zealand, with additional insights from world leaders in the field. This conference review provides a focused summary of the key questions, emerging ideas and novel technologies that were presented in the symposia. Presented research demonstrated key advances in how stem cell biology may allow us to better understand pluripotency, as well as how environmental and lifestyle factors, such as circadian disruption, smoking, alcohol and diet, affect gametogenesis, embryo implantation, placental function and reproductive capacity. Sessions also highlighted the role of reproductive biology in providing insight into the mechanisms and processes governing a wide range of biological science disciplines, including cancer research and therapies, oncofertility, conservation of native species and chronic non-communicable diseases. Recurring themes included the importance of male and female gamete quality for reproductive potential and the critical and varied roles of the placenta in the maintenance of a healthy pregnancy. Dysregulation of reproductive processes can contribute to a variety of pathological states that affect future health, fertility and fecundity. Research being conducted by the SRB has the potential to shape not only the fertility of the current generation, but also the health and reproductive viability of future generations.


2021 ◽  
Author(s):  
◽  
Daniel Francis McNaughtan

<p>The brown alga Colpomenia bullosa was first observed in New Zealand more than 20 years ago, yet very little is known about its current intertidal distribution or possible effects it may be having on native communities. This study addresses some of these issues. Surveys indicate little spatial variation in abundance around the Wellington region, however, the sporophytic crustose phase is restricted to pools high in the littoral zone while the gametophytic upright has a low- to sub-littoral distribution. Physiology experiments indicate that C. bullosa can tolerate a wide range of environmental conditions, but the crustose phase has a poor desiccation tolerance. A series of tranplant and competition experiments confirmed this and suggested that the crustose phase requires some level of facilitation by molluscan herbivores in order to become established. These experiments also revealed that crustose C. bullosa does not compete well against more upright macroalgal species. The effects of this introduced algae on native communities are likely to be minimal given its restricted intertidal distribution and its inability to compete against more upright species.</p>


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