The dilemma of Guinea grass (Megathyrsus maximus): a valued pasture grass and a highly invasive species

2021 ◽  
Author(s):  
Aaron C. Rhodes ◽  
Robert M. Plowes ◽  
John A. Goolsby ◽  
John F. Gaskin ◽  
Boaz Musyoka ◽  
...  
Keyword(s):  
Invasive Species ◽  
Pasture Grass ◽  
Guinea Grass

scholarly journals Hyptis spicigera (black sesame).

2020 ◽  
Author(s):  
Shruti Dube
Keyword(s):  
Invasive Species ◽  
Caribbean Region ◽  
Tropical Africa ◽  
Invasive Weed ◽  
Pasture Grass ◽  
Agricultural Weed ◽  
Annual Herb ◽  
The Caribbean ◽  
Evidence Of Impact ◽  
Savannah Zone

Abstract Hyptis spicigera is an annual herb possibly native to tropical and subtropical America but now widely naturalized in tropical Africa and Asia, and Australia. This species has become a widespread weed in the Guinea Savannah zone. Its seeds contaminate the pasture grass seed. H. spicigera is listed as an agricultural weed in South Asia, Southeast Asia and Africa (e.g. Burkina Faso, Cameroon, Ghana, Guinea, Nigeria). It is considered an invasive weed in rice-growing areas in Madagascar with no further details. H. spicigera has also spread widely as a tropical weed in the Caribbean region, and is listed as an invasive species on the Global Register for Introduced and Invasive Species for Cuba with evidence of impact. H. spicigera is also listed in the 2017 edition of the Global Compendium of Weeds. This species received a high invasive risk score in an assessment of the invasive threat of introduced species in Australia.

Invasive Shot Hole Borers Euwallacea fornicatus, E. kuroshio, and E. perbrevis (Coleoptera: Curculionidae: Scolytinae)

EDIS ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 7
Author(s):  
Demian F. Gomez ◽  
Jiri Hulcr ◽  
Daniel Carrillo
Keyword(s):  
South Africa ◽  
Invasive Species ◽  
Prevention And Control ◽  
Economic Impacts ◽  
Forest Resources ◽  
Economic Damage ◽  
Ambrosia Beetles ◽  
Invasive Insects ◽  
The World ◽  
And Control

Invasive species, those that are nonnative and cause economic damage, are one of the main threats to ecosystems around the world. Ambrosia beetles are some of the most common invasive insects. Currently, severe economic impacts have been increasingly reported for all the invasive shot hole borers in South Africa, California, Israel, and throughout Asia. This 7-page fact sheet written by Demian F. Gomez, Jiri Hulcr, and Daniel Carrillo and published by the School of Forest Resources and Conservation describes shot hole borers and their biology and hosts and lists some strategies for prevention and control of these pests. http://edis.ifas.ufl.edu/fr422

High predatory efficiency and abundance drive expected ecological impacts of a marine invasive fish

2020 ◽  
Vol 637 ◽  
pp. 195-208 ◽  
Author(s):  
EM DeRoy ◽  
R Scott ◽  
NE Hussey ◽  
HJ MacIsaac
Keyword(s):  
Invasive Species ◽  
Native Species ◽  
Ecological Impact ◽  
Marine Species ◽  
Ecological Impacts ◽  
Negative Effects ◽  
Marine Predator ◽  
Eastern Gulf Of Mexico ◽  
Red Grouper ◽  
Per Capita

The ecological impacts of invasive species are highly variable and mediated by many factors, including both habitat and population abundance. Lionfish Pterois volitans are an invasive marine species which have high reported detrimental effects on prey populations, but whose effects relative to native predators are currently unknown for the recently colonized eastern Gulf of Mexico. We used functional response (FR) methodology to assess the ecological impact of lionfish relative to 2 functionally similar native species (red grouper Epinephelus morio and graysby grouper Cephalopholis cruentata) foraging in a heterogeneous environment. We then combined the per capita impact of each species with their field abundance to obtain a Relative Impact Potential (RIP). RIP assesses the broader ecological impact of invasive relative to native predators, the magnitude of which predicts community-level negative effects of invasive species. Lionfish FR and overall consumption rate was intermediate to that of red grouper (higher) and graysby grouper (lower). However, lionfish had the highest capture efficiency of all species, which was invariant of habitat. Much higher field abundance of lionfish resulted in high RIPs relative to both grouper species, demonstrating that the ecological impact of lionfish in this region will be driven mainly by high abundance and high predator efficiency rather than per capita effect. Our comparative study is the first empirical assessment of lionfish per capita impact and RIP in this region and is one of few such studies to quantify the FR of a marine predator.

PRODUCTIVITY OF PASTURAL HERBS WITH PARTICIPATION OF FESTULOLIUM DEPENDING ON WEATHER CONDITIONS OF VEGETATION PERIODS

2020 ◽  
Author(s):  
Kira Privalova ◽  
Ruslan Karimov
Keyword(s):  
Weather Conditions ◽  
Research Data ◽  
Pasture Grass ◽  
Moisture Supply ◽  
Productivity Indicators ◽  
Heat And Moisture

Based on 13 years of research, data are presented on the productivity of pasture grass stands with the participation of festulolium (cultivar VIK 90) in years with different conditions of heat and moisture supply of vegetation periods. Productivity indicators, depending on weather conditions, changed 1.5 times.

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