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Biodiversity Impact Of Invasive Plants In Tropical Biodiversity Biology

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Tropical zone is the biodiversity hot topographic point ( Briggs, 1996 ) about three-fourthss of the universes species are confined to the tropic of the universe ( Wilson, 1992 ) . Though tropical wood ecosystems are more immune to invasion by foreigner workss than other biome ( Edward, 2009 ) , they are extremely baleful by invasive species ( Association for Tropical Biology and Conservation, biotropica, 2010 ) . Invasive species are making important challenges to the direction and preservation of the autochthonal biodiversity. The distribution of invasive works species occurred at ecosystem degree, community degree and at the species degree ( Meyer et al.

, 2004 ) . At least one alien species is present in about all tropical countries ( Usher 1991 ) .

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Invasive workss alter the local environment more favorable to them but less favorable to the native species ( Hoffmann et al. , 2004 ) and therefore modified local ecosystem. Biological invasion has become a considerable economic, societal, and peculiarly ecological job of planetary impact ( Cavalcante and Major, 2006 ) . The of import ecological impacts identified include decrease in native works species richness, copiousness and alternation in ecological map ( Vitousek & A ; Walker, 1989 ; Adair & A ; Groves, 1998 ; Levine et al.

, 2003 ; Ogle, Reiners & A ; Gerow, 2003 ; Vila et al. , 2006 ; Hejda, Pysek & A ; Jarosik, 2009 cited in Martin and Murray, 2010 ) . Invasive works species can covert the big country tropical flora to an alien monoculture and greatly cut down the biodiversity, for illustration, the figure of birds, mammals, tree seedlings were greatly reduced in Australia after the invasion of the country by foreign works species ( Braithwaite et al. 1989 ) and Cogongrass ( Imperata cylindrica ) forms big, monotypic sweeps, with Asia describing over 35 million estates affected ( Garrity et al. 1997 ) .

Invasive species are presenting a serious menace to biodiversity ( IUCN, 2000 ) . The Millennium Ecosystem Assessment ( 2005 ) has pointed that the impacts of invasive species on the tropical ecosystems are increasing quickly. Similarly, acknowledging the increasing issue of impact of invasive species, Convention on Biological Diversity, call on undertaking parties to “ forestall the debut of, control or eliminate invasive species that threaten ecosystems, home grounds and species ” Article 8 ( H ) .

This systematic reappraisal effort to summarises, appraise and pass on the resultsA of the available surveies to turn to the impact of invasive workss on tropical biodiversity. This protocol will supply a priori usher and let scientific communities to notice on methodological analysis and other relevant issues. Diverse surveies are available related to impact of invasive works species on tropical biodiversity. Some surveies suggest that invasion of native flora by the non native workss does non ever lead to worsen in native biodiversity ( e.g. Sax & A ; Gaines, 2003 ; Sax, Kinlan & A ; Smith, 2005 ) . Biological invasions have been the topic of intensive ecological research during the last two decennaries ( All right 2001 ) . Comprehensive studied have been done for many tropical woods e.g. the Hawaiian Islands ( Fine, 2002 ) but some writers argues that the biological invasion research has by and large ignored tropical woods ( Drake et al. 1989, Groves & A ; Burdon 1986, Williamson 1996 cited in Fine, 2002 ) .

In such combative state of affairs, it seems rather sensible to syntheses these surveies to better the efficiency of the preservation attempts in continuing biodiversity of the Torrid Zones and develop a concrete grounds base on the impact of invasive species which will supply indifferent scientific grounds base to assist decision-makers to make up one’s mind and implement necessary policy intercession to halt farther invasion of the tropical biodiversity and place countries where grounds is missing to direct research and support on more important docket.

Aim of the reappraisal

Primary inquiry

What are the effects of invasive workss on biodiversity of the tropical zone?

Table 1: Definition of constituents of the primary systematic reappraisal inquiry






in the tropical zone

Invasion by invasive works species in tropical zone

Biodiversity in forest, savannas or grassland before the invasion or any relevant or any relevant

Any reported alteration in tropical biodiversity e.g.

Speciess profusion, copiousness of native works species, tree denseness


3.1. Search Scheme

Relevant published and unpublished literature and informations will be collated by following scheme. Due to the resource constraints merely English linguistic communication literatures will be taken into consideration.

3.1.1 Scope of hunt

I will utilize the undermentioned database hunt to recover the literatures and informations

ISI Web of Knowledge

Science Direct

Wiley InterScience

Cambridge Journal

Cab Direct

CSA Biological Sciences Database ( CSA/CIG ) A


In add-on to gray literatures are searched in the web site of relevant organisation as listed in subdivision 3.1.5 which helps to uncover of import information about the tropical forestry and invasive species interaction. First hunts are conducted on rubric, keyword and abstract footing and followed by full text hunts. Hits are so checked for the relevancy.

3.1.2 Search footings

Effective and comprehensive list of related cardinal words as described in the tabular array -2 will be used to recover the literatures from the database specified above.

Table 2: Search footings for reappraisal

Capable term

Intervention term

combine with OR


combine with OR

Tropic* biodiversity

Speciess profusion

Invas* works

not native works

alien works

foreigner works

introduced works

Search term combinations

Table: 3 Search term combinations and no of hits

Key word 1

Key word 2

Entire hits

( Topic hunt )

Refined hits in

Web of scientific discipline

Tropic* biodiversity


Invas* works


Tropic* biodiversity


Non native works


Tropic* biodiversity


alien works


Tropic* biodiversity


foreigner works


Tropic* biodiversity


non-indigenous works


Tropic* Species profusion


Invas* works


Tropic* Species profusion


Non native works


Tropic* Species profusion


alien works


Tropic* Species profusion


foreigner works


Tropic* Species profusion


non-indigenous works


tropical biodiversity


( alien works ) OR ( invasive works ) OR ( non indigen works ) OR ( not autochthonal works )



No of hits and the retrieval of relevant literature varies between the informations base hunts, in the above tabular array hits obtained by web of scientific discipline is mentioned as an illustration. The same hunt tem combination give rather different hit in another database hunt, for illustration, for the first hunt term [ tropic*biodiversity AND invas*plant ] Cab direct retrieved 56 articles.

In add-on to the web of scientific discipline the hunt databases mentioned in subdivision 3.1.1 have been used in the readying of this protocol and will besides be used in concluding systematic reappraisal.

3.1.3 Specialist web beginnings will be conducted





3.1.4. Internet Search

The cyberspace will be searched utilizing the hunt engines. The first

70 hits for each hunt will be recorded and examined for relevancy.





3.1.5 Specialist bureaus and organisation informations hunt

At planetary degree:

Food and Agriculture Organization of the United Nations ( FAO )

IUCN/Invasive species specials group

CABI- invasive species collection

Convention on biological diverseness ( CBD )

International Weed Science Society ( IWSS )

UNEP-World Conservation Monitoring Centre ( WCMC )

Global Invasive Species Information Network ( GISIN )

Global Invasive Species Programme ( GISP )

In add-on to this regional degree bureaus and organisation in tropical states will besides consulted.


Association of Southeast Asiatic Nations, Regional Centre for Biodiversity Conservation ( ARCBC )

Invasive Alien Flora of India

Weed Science Society of Japan

Weed Science Society of China

Asia-Pacific Forest Invasive Species Network ( APFISN

Asia-Pacific Forest Invasive Species Network ( APFISN )


Invasive Speciess Council

South America:

Inter-American Biodiversity Information Network – IABN Invasive Information Network

3.2. Study Inclusion standards

The relevant surveies ( articles, literatures, book subdivisions ) to be included in meta-analysis will be based in hierarchal judgement by first scanning the article rubrics followed by cardinal words, abstracts and full text. The relevance is determined by standards as described below. If the information presented in the surveies are non clear and needed to take more elaborate description original writers and their several organisation will be contracted. Kappa analysis will be carried out for repeatability. Disputes between two referees will be solved by 3rd independent referee.

Geographic location:

Study country of the relevant surveies should be within the Torrid Zones ( 23.438A°S to 137 23.438A°N ) .

3.2.1. Relevant topics:

Any surveies related to biodiversity alterations in the tropical zone because of invasive works species.

3.2.2. Types of intercession:

Invasion of the tropical zone ( forest land, agribusiness land, grass land or savannas ) by invasive works species

3.2.3. Types of comparators:

Any relevant surveies and surveies comparing the biodiversity of the tropical zone measuring before and after the consequence of invasive works species

3.2.4. Types of results:

Any survey which shows biodiversity alteration ( indexs like comparative species profusion or copiousness )

3.2.5. Types of surveies:

Any survey which describes qualitatively or quantitatively the consequence of invasive works species in the biodiversity ( species profusion, copiousness ) in wood land, grassland. Range land, agribusiness land, savannas. Those surveies which present comparing of before and after the invasion or the comparing of the proportion of alien species to native species will be included. Surveies can be articles in equal reviewed diaries, book chapters or Grey literatures

3.3. Potential consequence qualifier and grounds for heterogeneousness

Different edaphic, biotic, topographic and climatic status which governs the flora type of the Torrid Zones such as dirt quality, height, facets, forest types and strength of human perturbations which may react to works invasions in different ways affect the survey outcomes. Furthermore, the biological features of the invasive species besides affect the survey.

3.4. Study quality appraisal

The searched articles, Grey literatures and paperss will be buttockss harmonizing to the antecedently designed survey inclusion standards. These are so checked independently for cogency, dependability and pertinence. A Quality appraisal checklist is developed as shown below with the audience of the reappraisal squad and will be amended after stakeholders ‘ feedbacks. Internal and external cogency will be checked utilizing a set of standards.

Table 4: Quality appraisal checklist for look intoing cogency, dependability and pertinence





Target population and intercession defined


Sample representative


Experimental design/randomization


Base line information


Valid informations aggregation


Description of confusing factors


Applicability of the research


Any prejudices

Beginning: Adapted from category notes, 2010 and literature reappraisal

3.5. Data extraction scheme

Qualitative and measures information will be extracted from the surveies included for the reappraisal. Information on invasive species, their effects on tropical biodiversity ( species profusion, copiousness and competition ) will be extracted in to a specially designed extraction signifier as shown in annex-1. Where informations are available, informations will be extracted as earlier and after informations and other informations will be extracted as appropriate.

3.6. Data synthesis and presentation

Data synthesis method will be determined by the handiness of the informations and informations type. The surveies will be grouped harmonizing to the type of information available e.g. reappraisal article, original research. If sufficient quantitative information is available meta-analysis will be conducted to cognize the significance of the consequence of invasive works species to the tropical biodiversity. If in sufficient quantitative information is available qualitative analysis of grounds will be undertaken.

Cite this Biodiversity Impact Of Invasive Plants In Tropical Biodiversity Biology

Biodiversity Impact Of Invasive Plants In Tropical Biodiversity Biology. (2017, Jul 11). Retrieved from https://graduateway.com/biodiversity-impact-of-invasive-plants-in-tropical-biodiversity-biology-essay/

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