The negative ecological impacts of a globally introduced species decrease with time since introduction

2018 ◽  
Vol 24 (9) ◽  
pp. 4428-4437 ◽  
Author(s):  
Libor Závorka ◽  
Mathieu Buoro ◽  
Julien Cucherousset
Keyword(s):  
Introduced Species ◽  
Ecological Impacts ◽  
Time Since Introduction

scholarly journals The influence of time since introduction on the population growth of introduced species and the consequences for management

2017 ◽  
Vol 59 (2) ◽  
pp. 89-97 ◽  
Author(s):  
Hiroyuki Yokomizo ◽  
Takenori Takada ◽  
Keiichi Fukaya ◽  
John G. Lambrinos
Keyword(s):  
Population Growth ◽  
Introduced Species ◽  
Time Since Introduction

INTRODUCED DECAPOD CRUSTACEANS IN SINGAPORE'S RESERVOIRS

COSMOS ◽  
2010 ◽  
Vol 06 (01) ◽  
pp. 85-90 ◽  
Author(s):  
DARREN C. J. YEO
Keyword(s):  
Introduced Species ◽  
Ecological Impacts ◽  
Lag Phase ◽  
Freshwater Crayfish ◽  
Decapod Crustaceans ◽  
Pet Trade ◽  
Freshwater Shrimps ◽  
Forest Stream ◽  
Macrobrachium Lanchesteri ◽  
Invasion Pathway

Introduced or alien freshwater decapod crustaceans from Singapore's reservoirs are documented from the results of an ongoing survey. Four species of decapods were recorded in the reservoirs, viz., one freshwater crayfish, Cherax quadricarinatus (Parastacidae) and three freshwater shrimps, Macrobrachium lanchesteri, M. nipponense, and M. aff. inflatum (Palaemonidae). Native decapods were not found in the actual reservoirs, but in forest stream inlets draining into the reservoirs. All four species were introduced through the ornamental pet trade, indicating the significance of this invasion pathway in Singapore. As yet, no ecological impacts on native ecosystems are known for these introduced species, although the possibility that they could be undergoing a lag phase or of more invasive alien decapods being introduced cannot be discounted.

scholarly journals Sustainability Analysis of Prosopis juliflora (Sw.) DC Based Restoration of Degraded Land in North India

Land ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 59 ◽  
Author(s):  
Sheikh Adil Edrisi ◽  
Ali El-Keblawy ◽  
Purushothaman Chirakkuzhyil Abhilash
Keyword(s):  
Introduced Species ◽  
Plant Species ◽  
Resource Scarcity ◽  
Prosopis Juliflora ◽  
Ecological Impacts ◽  
North India ◽  
Land Restoration ◽  
Degraded Land ◽  
Degraded Lands ◽  
Sustainability Analysis

Restoration of marginal and degraded lands is essential for regaining biodiversity and ecosystems services, and thereby attaining UN-Sustainable Development Goals. During the last few decades, many fast growing and hardy trees have been introduced worldwide to restore the marginal and degraded lands for ecosystem stability. Unfortunately, most of these introduced species have become invasive and invaded the nearby productive systems, leading to significant biodiversity loss and land degradation. Therefore, it is imperative to conduct a sustainability analysis of the introduced species for necessary course correction and also for preventing the future utilisation of such species for land restoration. With this backdrop, the present study was conducted to analyse the socio-ecological impacts of a widely used species, i.e., Prosopis juliflora (Sw.) DC based restoration of degraded land of Lucknow, North India. For this, ecological (soil quality and plant biodiversity) and social (livelihood) indicators have been studied over a period of two years (2015–16) through direct field sampling and questionnaire-based surveys. While there was a positive difference (p < 0.01) in the key physico-chemical properties of the P. juliflora-invaded soil than the non-invaded site, the belowground microbial load was significantly lower (19.46 × 106 g−1 of soil) in invaded land as compared to the non-invaded one (31.01 × 106 g−1). Additionally, the invasion of P. juliflora had significantly reduced the biodiversity by displacing the local flora such as Achyranthes aspera L., Amaranthus spinosus L., Cynodon dactylon (L.) Pers, Euphorbia hirta L., etc. The invaded area had only eight plant species having an effective number of species (ENS) of 7.2, whereas the non-invaded area had the presence of 26 plant species with an ENS of 23.8. Although the local people utilised P. juliflora as fuelwood mostly during summer and winter seasons, the invasion resulted in a fodder deficit of 419.97 kg household−1 y−1 leading to resource scarcity in the invaded area in comparison to the non-invaded area. Ecodistribution mapping clearly showed that P. juliflora is already found in most of the tropical and subtropical countries (~103) including in India and has become invasive in many countries. Therefore, we recommend that P. juliflora must be wisely used for the land restoration programs targeted during the United Nations Decade of Ecosystem Restoration (2021–2030) as this species has invasive traits and thereby reduces the ecosystem sustainability of the invaded areas.

Ecological Effects of Introduced Species—Straightforward Impacts

2013 ◽  
Author(s):  
Daniel Simberloff
Keyword(s):  
Introduced Species ◽  
Ecological Impacts ◽  
Ecological Effects ◽  
Nonnative Species ◽  
Huge Number ◽  
Intensive Research ◽  
Casual Observer

Invasive nonnative species have a huge number of ecological impacts. Some are apparent to the most casual observer; others are less obvious, and some, while important, are so subtle that they cannot be detected without intensive research. However, just because they are subtle need...

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.

A method for rearing Arhopalus ferus (Mulsant) (Coleoptera Cerambycidae) larvae on a modified artificial diet

2015 ◽  
Vol 68 ◽  
pp. 353-359 ◽  
Author(s):  
A.M. Barrington ◽  
D.P. Logan ◽  
P.G. Connolly
Keyword(s):  
Introduced Species ◽  
Artificial Diet ◽  
Larval Density ◽  
Pine Bark ◽  
Pine Wood ◽  
Rearing Method ◽  
Sawn Timber

Burnt pine longhorn (BPL) Arhopalus ferus (Mulsant) (Coleoptera Cerambycidae) is an introduced species sometimes found in association with export logs and sawn timber A rearing method was developed to produce larvae of a known age number and quality for control trials Growth of larvae from newly hatched to 5 weeks was measured on a standard cerambycid artificial diet and on modified diets Replacing pine wood with pine bark sawdust increased survival at 5 weeks from 23 to 76 and mean weight from 9 to 21 mg There were significant interactions between the influences of three factors (diet period of rearing initial larval density) on the weight of surviving larvae Individual rearing was preferred for convenience and a standardised method was used to rear 8740 larvae for disinfestation trials Establishment and survival to 6 weeks for these larvae was 97

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