scholarly journals Outstanding performance of an invasive alien tree Bischofia javanica relative to native tree species and implications for management of insular primary forests

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9573
Author(s):  
Tetsuto Abe ◽  
Nobuyuki Tanaka ◽  
Yoshikazu Shimizu
Keyword(s):  
Tree Species ◽  
Logistic Model ◽  
Forest Community ◽  
Population Increase ◽  
Canopy Trees ◽  
Native Trees ◽  
Native Tree ◽  
Native Tree Species ◽  
Bischofia Javanica ◽  
Primary Forests

Invasive alien tree species can exert severe impacts, especially in insular biodiversity hotspots, but have been inadequately studied. Knowledge of the life history and population trends of an invasive alien tree species is essential for appropriate ecosystem management. The invasive tree Bischofia javanica has overwhelmed native trees on Haha-jima Island in the Ogasawara Islands, Japan. We explored forest community dynamics 2 years after a typhoon damaged the Sekimon primary forests on Haha-jima Island, and predicted the rate of population increase of B. javanica using a logistic model from forest dynamics data for 19 years. During the 2 years after the typhoon, only B. javanica increased in population size, whereas populations of native tree species decreased. Stem diameter growth of B. javanica was more rapid than that of other tree species, including native pioneer trees. Among the understory stems below canopy trees of other species, B. javanica grew most rapidly and B. javanica canopy trees decreased growth of the dominant native Ardisia sieboldii. These competitive advantages were indicated to be the main mechanism by which B. javanica replaces native trees. The logistic model predicted that B. javanica would reach 30% of the total basal area between 2017 (in the eastern plot adjacent to a former B. javanica plantation) and 2057 (in the western plot distant from the plantation site), which is a maximum percentage allowing to eradicate under the present guideline of the National Forest. The results suggest immediate removal of B. javanica is required to preserve native biodiversity in these forests.

Fourteen Threatened Native Trees of Bangladesh: Which Pretreatment Generates Maximum Germination Percent?

2015 ◽  
Vol 22 (2) ◽  
pp. 83-86
Author(s):  
G.N. Hasnat ◽  
M. Hossain ◽  
M. Bhuiyan ◽  
M. Alam
Keyword(s):  
Tree Species ◽  
Cold Water ◽  
Germination Rate ◽  
Hot Water ◽  
Species Response ◽  
Native Trees ◽  
Native Tree ◽  
Speed Up ◽  
Native Tree Species ◽  
Castanopsis Indica

Effect of different pre-sowing treatments on germination of fourteen threatened native tree species of Bangladesh was studied to find out the appropriate pre-sowing treatments to speed up germination rate of the required and desired species. Hard coated fruits and seeds of Canarium resiniferum, Castanopsis indica, Protium serratum, Quercus acuminata and Vitex peduncularis were treated with sand paper, nicking, cold water, hot water, H2SO4 and HCl. Seeds of Brownlowia elata, Dichopsis polyantha, Firmiana colorata, Lophopetalum fimbriatum, Pterospermum acerifolium, Pterospermum semisagittatum, Pterygota alata and Sterculia villosa were sown in polybags, propagator house and nursery bed in normal, flat and in 450 angle position. Hard fruits of Castanopsis indica sown in polybags without any treatment showed 25% germination but increased to 67% when fruits were treated with sand paper rubbing at the distal end. Seeds of Lophopetalum fimbriatum germinated only 26% when sown normally in polybags but when sown in propagator house it increased to 90%. Different species response differently with pre-sowing treatments but in general pre-sowing treatments increases the germination percent in all the species.

scholarly journals Biotic threats for 23 major non-native tree species in Europe

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Elisabeth Pötzelsberger ◽  
Martin M. Gossner ◽  
Ludwig Beenken ◽  
Anna Gazda ◽  
Michal Petr ◽  
...  
Keyword(s):  
Health Risk ◽  
Tree Species ◽  
Native Species ◽  
Temporal Trends ◽  
European Countries ◽  
Current Health ◽  
Native Trees ◽  
Native Tree ◽  
Native Tree Species

AbstractFor non-native tree species with an origin outside of Europe a detailed compilation of enemy species including the severity of their attack is lacking up to now. We collected information on native and non-native species attacking non-native trees, i.e. type, extent and time of first observation of damage for 23 important non-native trees in 27 European countries. Our database includes about 2300 synthesised attack records (synthesised per biotic threat, tree and country) from over 800 species. Insects (49%) and fungi (45%) are the main observed biotic threats, but also arachnids, bacteria including phytoplasmas, mammals, nematodes, plants and viruses have been recorded. This information will be valuable to identify patterns and drivers of attacks, and trees with a lower current health risk to be considered for planting. In addition, our database will provide a baseline to which future impacts on non-native tree species could be compared with and thus will allow to analyse temporal trends of impacts.

scholarly journals Environmental Stakeholders' Perceptions of Urban Native Tree Species Values in Abuja City, Nigeria's Federal Capital Territory

2019 ◽  
pp. 1-10
Author(s):  
J. O. Ihuma ◽  
S. Madakan ◽  
U. D. Chima
Keyword(s):  
Tree Species ◽  
Economic Value ◽  
Erosion Control ◽  
Cooling Effect ◽  
Ecosystem Functions ◽  
Construction Companies ◽  
Urban City ◽  
Native Trees ◽  
Native Tree ◽  
Native Tree Species

This study was conducted to investigate the value perceptions of native tree species in urban landscape by three groups of environmental stakeholders – residents, estate developers and construction companies that reside in Abuja, the Nigeria’s Federal Capital Territory. A Multi-Criteria Analysis (MCA) of landscape scale ecosystem functions and services valuation scenarios were used. A total of one hundred and eighty (180) sets of questionnaire were distributed equally among the three stakeholders (60 each) to ascertain their perceptions on the need to protect native tree species by asking them to rank eight reasons why the protection of native tree species is important in urban/city landscape. The reasons ranked were (i) Aesthetics and beautification of environment, (ii) Microclimatic and cooling effect, (iii) Windbreak, (iv) Erosion control, (v) Conservation of native tree species, (vi) Obstruction of view to enhance privacy (vii) Economic value of the species and, (viii) Any other reason. Results showed that Aesthetics and beautification of environment ranked first by a combination of all stakeholders, and also by Estate Developers alone, while Erosion control and Economic value of the species were ranked first by the Residents and the Construction Companies, respectively. Stakeholders’ mean scores for Aesthetics & beautification of environment, Microclimatic & cooling effect, Conservation of native tree species, and Obstruction of view to enhance privacy, varied significantly (p < 0.05) while there was no significant differences in their mean scores for Windbreak, Erosion control, and Economic value of the species. The differences in the stakeholders’ perception of the value of native trees as revealed by the rankings and significant differences in scores for some of the value criteria to a large extent underscore the values they place on them which in turn will influence their attitude towards the conservation and protection of the species. Therefore, the need for effective environmental education and enlightenment campaigns to sensitise all stakeholders on the overall values and roles of native trees in the city, is emphasized.

scholarly journals Native trees of Mexico: diversity, distribution, uses and conservation

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9898
Author(s):  
Oswaldo Tellez ◽  
Efisio Mattana ◽  
Mauricio Diazgranados ◽  
Nicola Kühn ◽  
Elena Castillo-Lorenzo ◽  
...  
Keyword(s):  
Species Richness ◽  
Tree Species ◽  
Ex Situ Conservation ◽  
Ex Situ ◽  
Priority Areas ◽  
Threat Status ◽  
Native Trees ◽  
Native Tree ◽  
Native Tree Species

Background Mexico is one of the most floristically rich countries in the world. Despite significant contributions made on the understanding of its unique flora, the knowledge on its diversity, geographic distribution and human uses, is still largely fragmented. Unfortunately, deforestation is heavily impacting this country and native tree species are under threat. The loss of trees has a direct impact on vital ecosystem services, affecting the natural capital of Mexico and people’s livelihoods. Given the importance of trees in Mexico for many aspects of human well-being, it is critical to have a more complete understanding of their diversity, distribution, traditional uses and conservation status. We aimed to produce the most comprehensive database and catalogue on native trees of Mexico by filling those gaps, to support their in situ and ex situ conservation, promote their sustainable use, and inform reforestation and livelihoods programmes. Methods A database with all the tree species reported for Mexico was prepared by compiling information from herbaria and reviewing the available floras. Species names were reconciled and various specialised sources were used to extract additional species information, i.e. endemic status, threat status, availability in seed collections, reports on plant uses and conservation actions currently in place. With this information, a comprehensive catalogue of native trees from Mexico was redacted. Available georeferenced records were used to map each species distribution and perform spatial analyses to identify gaps of information and priority areas for their conservation and exploration. Results Mexico has at least 2,885 native tree species, belonging to 612 genera and 128 families. Fabaceae is the most represented family and Quercus the most represented genus. Approximately 44% of tree species are endemic to the country. The southern part of the country showed the highest values of species richness. Six hundred and seventy-four species have at least one documented human use. In terms of conservation assessment, ca. 33% of species have been assessed by either the IUCN Red List (919) or the National protection catalogue “NORMA Oficial Mexicana NOM-059” (29) or both (45). Additionally, 98 species have been included in the CITES listing for protection. In terms of existing conservation efforts, 19% of species have ex situ protection in seed banks, while protected areas overlap with all the identified peaks of species richness, except for those in the states of Veracruz and Chiapas. This work constitutes a key milestone for the knowledge, management, and conservation of the Mexican native trees. The two areas with high density of tree species identified in Veracruz and Chiapas represent two priority areas for tree conservation in Mexico, where integrated in situ and ex situ conservation efforts should be focused.

scholarly journals Crown cover of native trees in the structural development of reforestations in Rondônia

Revista CERES ◽  
2017 ◽  
Vol 64 (5) ◽  
pp. 451-456
Author(s):  
Michelliny Pinheiro de Matos Bentes ◽  
Rodrigo Barros Rocha ◽  
Ana Luma Caldas Almeida
Keyword(s):  
Projection Method ◽  
Tree Species ◽  
Amazon Region ◽  
Projection Data ◽  
Structural Development ◽  
Initial Development ◽  
Crown Cover ◽  
Native Trees ◽  
Native Tree ◽  
Native Tree Species

ABSTRACT The objective of this study was to assess the initial development of a reforestation structure using the crown projection method as an indicator to monitor the recovery in degraded areas in the State of Rondônia. The method consisted of correlating canopy projection data with structural performance variables of six native tree species of the Amazon region. The study found that the species “large acacia” had the best capacity to promote shading, favor rapid covering, protection, and stabilization of the soil in the initial phase, at 24 months, with a crown area of 62.82 m². The crown projection method was suitable to identify the native trees that stand out in the initial years of restoration of degraded areas. The method can be used to indicate variations in the structural development of species as a function of site quality and to assist in determining the feasibility of native tree species selected for reforestation. Therefore, further studies on this approach are needed to develop models of crown cover prediction and validate crown cover as an indicator of reforestation development in restoration processes in the Amazon region.

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