Population Status Assessment and Restoration Modeling of White AbaloneHaliotis sorenseniin California

2016 ◽  
Vol 35 (3) ◽  
pp. 593-599 ◽  
Author(s):  
Cynthia A. Catton ◽  
Kevin L. Stierhoff ◽  
Laura Rogers-Bennett
Keyword(s):  
Population Status ◽  
Status Assessment

Evaluating the effect of expert elicitation techniques on population status assessment in the face of large uncertainty

2022 ◽  
Vol 306 ◽  
pp. 114453
Author(s):  
Jennifer F. Moore ◽  
Julien Martin ◽  
Hardin Waddle ◽  
Evan H. Campbell Grant ◽  
Jill Fleming ◽  
...  
Keyword(s):  
Expert Elicitation ◽  
Population Status ◽  
Large Uncertainty ◽  
The Face ◽  
Status Assessment

Rediscovery of the mistletoeBakerella hoyifoliasubsp.bojeri(Loranthaceae) on Reunion Island: population status assessment for its conservation

2017 ◽  
Vol 164 (3) ◽  
pp. 229-236 ◽  
Author(s):  
S. Albert ◽  
A. Rhumeur ◽  
J. L. Rivière ◽  
A. Chauvrat ◽  
S. Sauroy-Toucouère ◽  
...  
Keyword(s):  
Island Population ◽  
Reunion Island ◽  
Population Status ◽  
Réunion Island ◽  
Status Assessment

scholarly journals MONITORING PROPOSAL OF THE SPECIES VIOLET CARPENTER BEE XYLOCOPA VIOLACEA IN POLAND

2021 ◽  
Vol 360 (3) ◽  
pp. 5-17
Author(s):  
Maria ALEKSA ◽  
Keyword(s):  
Field Research ◽  
Scientific Publication ◽  
Population Status ◽  
Effective Protection ◽  
Carpenter Bee ◽  
Regular Monitoring ◽  
Habitat Stability ◽  
Status Assessment ◽  
National Borders

The main purpose of this scientific publication is to present the suggested methods of monitoring the species violet carpenter bee Xylocopa violacea, which belongs to Hymenoptera of the bee family Apidae. Despite the fact that this insect is only partially protected under Polish national law, there are very few identified localities of these animals in Poland. The main problem related to the uncertainty of the number of the violet carpenter bee Xylocopa violacea is the lack of monitoring within national borders. The proposed method of population status assessment is based on the field research. These studies include the observations of many elements of the population and the environment and on predicting what are the prospects for protecting the violet carpenter bee Xylocopa violacea in Poland. The proposed method of population status assessment is based on the analysis of species presence and abundance and the proposed method of habitat status assessment is based on the analysis of area, food base, type of environment, elements of the habitat, the nature of the surroundings and habitat stability. The proposed methods can be also applied for Xylocopa valga, which can be easily confused with the violet carpenter bee Xylocopa violacea. What is the most important – regular monitoring may contribute to the recognition of other places of occurrence and will enable effective protection of the violet carpenter bee Xylocopa violacea in Poland.

scholarly journals Conservation status assessment and new population record of the threatened Golden Himalayan Spike Phlomoides superba (Royle ex Benth.) Kamelin & Makhm. from Jammu & Kashmir, India

2017 ◽  
Vol 9 (4) ◽  
pp. 10089 ◽  
Author(s):  
Amber Srivastava ◽  
Yash Pal Sharma ◽  
O.P. Sharma Vidyarthi ◽  
Sunil Kumar Srivastava
Keyword(s):  
Conservation Status ◽  
Population Status ◽  
In The Wild ◽  
Status Assessment

This paper deals with distribution and conservation status of the Golden Himalayan Spike Phlomoides superba (Royle ex Benth.) Kamelin & Makhm. (syn. Eremostachys superba Royle ex Benth.), an endangered herb in India. A new locality report from Jammu & Kashmir along with population status in previously reported localities of occurrence of this species is also provided. Since the species is reported from a very few localities in India and is facing critical threats in the wild, the addition of a new locality holds significance in terms of its declining population status.

scholarly journals MONITORING PROPOSAL OF THE SPECIES Streptocephalus torvicornis (Waga 1842) IN POLAND

2020 ◽  
Vol 356 (55) ◽  
pp. 11-22
Author(s):  
Stanisław CUKIER ◽  
Keyword(s):  
Soil Samples ◽  
Water Bodies ◽  
Population Status ◽  
Effective Protection ◽  
Regular Monitoring ◽  
Large Branchiopods ◽  
Sources Of Pollution ◽  
Potential Sources ◽  
Status Assessment ◽  
Trees And Shrubs

The paper presents a proposal of methods for monitoring the species Streptocephalus torvicornis, which belongs to large branchiopods. This species occurs in small ephemeral water bodies. Currently, there is only one known locality of S. torvicornis in Poland. Many species of large branchiopods are considered to be in danger of extinction. Their observation in the environment is hampered by the periodic nature of the occurrence of adults. The proposed method of population status assessment is based on the analysis of soil samples in terms of the presence of persistent cysts. The following factors may be used to assess the condition of the habitat: the presence of vegetation indicating the astatic or ephemeral nature of the pools, the level of succession of trees and shrubs, the presence of fish, the presence of potential sources of pollution. The proposed methods are universal and can be applied to the monitoring of other large branchiopods species. Regular monitoring may contribute to the recognition of other places of occurrence and will enable effective protection of the species S. torvicornis in Poland.

scholarly journals Alternative method for assessment of southwestern Atlantic humpback whale population status

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259541
Author(s):  
Guilherme A. Bortolotto ◽  
Len Thomas ◽  
Philip Hammond ◽  
Alexandre N. Zerbini
Keyword(s):  
Population Size ◽  
Carrying Capacity ◽  
Scientific Uncertainty ◽  
Base Case ◽  
Population Status ◽  
Case Scenario ◽  
Alternative Method ◽  
Animal Populations ◽  
The Status ◽  
Status Assessment

The population of humpback whales (Megaptera novaeangliae) wintering off eastern South America was exploited by commercial whaling almost to the point of extinction in the mid-twentieth century. Since cessation of whaling in the 1970s it is recovering, but the timing and level of recovery is uncertain. We implemented a Bayesian population dynamics model describing the population’s trajectory from 1901 and projecting it to 2040 to revise a previous population status assessment that used Sampling-Importance-Resampling in a Bayesian framework. Using our alternative method for model fitting (Markov chain Monte Carlo), which is more widely accessible to ecologists, we replicate a “base case scenario” to verify the effect on model results, and introduce additional data to update the status assessment. Our approach allowed us to widen the previous informative prior on carrying capacity to better reflect scientific uncertainty around historical population levels. The updated model provided more precise estimates for population sizes over the period considered (1901–2040) and suggests that carrying capacity (K: median 22,882, mean 22,948, 95% credible interval [CI] 22,711–23,545) and minimum population size (N1958: median 305, mean 319, 95% CI 271–444) might be lower than previously estimated (K: median 24,558, mean 25,110, 95% CI 22,791–31,118; N1958: median 503, mean 850, 95% CI 159–3,943). However, posterior 95% credible intervals of parameters in the updated model overlap those of the previous study. Our approach provides an accessible framework for investigating the status of depleted animal populations for which information is available on historical mortality (e.g., catches) and intermittent estimates of population size and/or trend.

scholarly journals Distribution and population status assessment of the endemic grass-like palm Butia marmorii (Arecales: Arecaceae) in Paraguay

2017 ◽  
Vol 9 (4) ◽  
pp. 10021
Author(s):  
Irene Gauto ◽  
Fernando Palacios ◽  
Pamela Marchi ◽  
Nelson Silva ◽  
Gloria Céspedes
Keyword(s):  
Anthropogenic Impacts ◽  
Temporal Analysis ◽  
Distribution Analysis ◽  
Population Status ◽  
Visual Interpretation ◽  
Multi Temporal ◽  
Status Assessment ◽  
Distribution And Ecology ◽  
Two Populations

The palm Butia marmorii Noblick was described in 2006 and has been found to date in only two populations in Paraguay. It is a species threatened mainly due to habitat loss and its ecology is largely unknown.  Here we performed a potential distribution analysis, providing data about its distribution and ecology.  This work was carried out in the Alto Paraná Department, eastern Paraguay, South America.  We analyzed satellite images, in conjunction with a multi-temporal analysis using the sensors Landsat 1-MSS,5-TM,8-OLI, of the years 1973, 1984, 2002, 2012 and 2013; and a posterior visual interpretation of an ASTER ASTGTM2 radar image.  The final step was an in situ visual verification.  We registered 27 potential sites of distribution for Butia marmorii, finding it present in four sites, two of them with limited anthropogenic impacts.  We found a density of 0.0054 to 0.11 individuals/m2, and associations with the congener B. paraguayensis.  These new Paraguayan populations of Butia marmorii provide verifiable data demonstrating that anthropogenic impact is the principal threat to the species.  Here we found that the situation of B. marmorii is even worse than supposed before, and hence we consider the species to be Critically Endangered.

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