Screening of diseases in wild exotic birds on Tahiti Island – implications for French Polynesian conservation

2021 ◽  
Author(s):  
Caroline Blanvillain ◽  
Susana Saavedra ◽  
Tehani Withers ◽  
Jan Votýpka ◽  
Karine Laroucau ◽  
...  
Keyword(s):  
Exotic Birds

scholarly journals Contrasting determinants for the introduction and establishment success of exotic birds in Taiwan using decision trees models

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3092 ◽  
Author(s):  
Shih-Hsiung Liang ◽  
Bruno Andreas Walther ◽  
Bao-Sen Shieh
Keyword(s):  
Decision Tree ◽  
Species Traits ◽  
Gradient Boosting ◽  
Small Data ◽  
Invasion Process ◽  
Data Set ◽  
Establishment Success ◽  
Exotic Birds ◽  
Tree Models ◽  
Nominal Variables

Background Biological invasions have become a major threat to biodiversity, and identifying determinants underlying success at different stages of the invasion process is essential for both prevention management and testing ecological theories. To investigate variables associated with different stages of the invasion process in a local region such as Taiwan, potential problems using traditional parametric analyses include too many variables of different data types (nominal, ordinal, and interval) and a relatively small data set with too many missing values. Methods We therefore used five decision tree models instead and compared their performance. Our dataset contains 283 exotic bird species which were transported to Taiwan; of these 283 species, 95 species escaped to the field successfully (introduction success); of these 95 introduced species, 36 species reproduced in the field of Taiwan successfully (establishment success). For each species, we collected 22 variables associated with human selectivity and species traits which may determine success during the introduction stage and establishment stage. For each decision tree model, we performed three variable treatments: (I) including all 22 variables, (II) excluding nominal variables, and (III) excluding nominal variables and replacing ordinal values with binary ones. Five performance measures were used to compare models, namely, area under the receiver operating characteristic curve (AUROC), specificity, precision, recall, and accuracy. Results The gradient boosting models performed best overall among the five decision tree models for both introduction and establishment success and across variable treatments. The most important variables for predicting introduction success were the bird family, the number of invaded countries, and variables associated with environmental adaptation, whereas the most important variables for predicting establishment success were the number of invaded countries and variables associated with reproduction. Discussion Our final optimal models achieved relatively high performance values, and we discuss differences in performance with regard to sample size and variable treatments. Our results showed that, for both the establishment model and introduction model, the number of invaded countries was the most important or second most important determinant, respectively. Therefore, we suggest that future success for introduction and establishment of exotic birds may be gauged by simply looking at previous success in invading other countries. Finally, we found that species traits related to reproduction were more important in establishment models than in introduction models; importantly, these determinants were not averaged but either minimum or maximum values of species traits. Therefore, we suggest that in addition to averaged values, reproductive potential represented by minimum and maximum values of species traits should be considered in invasion studies.

Severe and rapid population declines in exotic birds

2016 ◽  
Vol 18 (6) ◽  
pp. 1667-1678 ◽  
Author(s):  
Kevin Aagaard ◽  
Julie L. Lockwood
Keyword(s):  
Population Declines ◽  
Exotic Birds

Site invasibility by exotic birds and mammals

1994 ◽  
Vol 69 (3) ◽  
pp. 251-259 ◽  
Author(s):  
K. Shawn Smallwood
Keyword(s):  
Exotic Birds

Field Guide to Exotic Birds

2014 ◽  
Vol 38 (2) ◽  
pp. 16-31
Author(s):  
Joanna Rose
Keyword(s):  
Field Guide ◽  
Exotic Birds

Occurrence of Velogenic Viscerotropic Newcastle Disease in Pet and Exotic Birds in 1991

1993 ◽  
Vol 37 (1) ◽  
pp. 254 ◽  
Author(s):  
B. Panigrahy ◽  
D. A. Senne ◽  
J. E. Pearson ◽  
M. A. Mixson ◽  
D. R. Cassidy
Keyword(s):  
Newcastle Disease ◽  
Exotic Birds

Native and Exotic Birds in a Suburban Habitat

1984 ◽  
Vol 11 (1) ◽  
pp. 181 ◽  
Author(s):  
RJ Green
Keyword(s):  
Negative Correlation ◽  
Exotic Plants ◽  
Influential Factor ◽  
Native Vegetation ◽  
Artificial Structures ◽  
Exotic Birds ◽  
Foraging Site ◽  
Native Birds ◽  
Factor Governing ◽  
Native Habitats

The exotic and native birds in the eastern suburbs of Melbourne, including the campus of Monash University, were studied during 1974-77. The proportion of exotic to native birds was far greater in suburban than native habitats. 'Total native vegetation' was found to be the most influential factor governing the number of both native and exotic birds, showing a positive and a negative correlation respectively. 'Total exotic plants' and various vegetation heights were also correlated, but were less important. The ground was the major foraging site for birds as a whole, followed by Eucalyptus spp. Native birds foraged proportionately more than did exotic birds on native rather than exotic plants, and in trees or shrubs rather than on the ground. When not foraging, they were seen proportionately more often than the exotics on native rather than exotic plants, and the exotics were seen proportionately far more often than the natives on artificial structures.

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