scholarly journals Population increase and changes in behavior and morphology in the Critically Endangered Redonda ground lizard ( Pholidoscelis atratus ) following the successful removal of alien rats and goats

2020 ◽  
Author(s):  
Colin M. DONIHUE ◽  
Jennifer C. DALTRY ◽  
Shanna CHALLENGER ◽  
Anthony HERREL
Keyword(s):  
Critically Endangered ◽  
Population Increase ◽  
Successful Removal

scholarly journals Recovery of the Critically Endangered Hainan gibbonNomascus hainanus

Oryx ◽  
2015 ◽  
Vol 51 (1) ◽  
pp. 161-165 ◽  
Author(s):  
Huaiqing Deng ◽  
Mingxia Zhang ◽  
Jiang Zhou
Keyword(s):  
Reproductive Age ◽  
Critically Endangered ◽  
Primate Species ◽  
Population Increase ◽  
Historical Sources ◽  
Adult Females ◽  
Group Population ◽  
Solitary Males ◽  
Number Of Individuals ◽  
Hainan Gibbon

AbstractThe Critically Endangered Hainan gibbonNomascus hainanusis one of the most threatened primate species and is now found only in the Bawangling National Nature Reserve of Hainan Province, China. We describe changes in population dynamics, and the current number of individuals, based on historical sources and fieldwork during 2002–2013. The population comprises a total of 20 individuals (including six solitary males) in three separate groups. All are confined to an area of c. 16 km2. The current population developed from two groups that comprised a total of 13 individuals in 2002, and has increased slowly since then, with the addition of one new group. Population increase is hindered by the gibbon's unique social structure of one adult male and two adult females, as well as the reproductive age limit in adult females. An imbalance in the sex ratio of offspring may also have hindered population recovery but further investigation of this is required. Our findings indicate that the Hainan gibbon is likely to remain Critically Endangered in the coming decades.

scholarly journals The history, status and trends of the Endangered Seychelles Magpie-robin Copsychus sechellarum

2016 ◽  
Vol 26 (4) ◽  
pp. 505-523 ◽  
Author(s):  
APRIL J. BURT ◽  
JULIE GANE ◽  
IAIN OLIVIER ◽  
LICIA CALABRESE ◽  
ARJAN DE GROENE ◽  
...  
Keyword(s):  
Social Conflict ◽  
Critically Endangered ◽  
Population Increase ◽  
Founder Population ◽  
Status And Trends ◽  
History Of ◽  
Steep Decline ◽  
Term Management ◽  
Unpublished Information

SummaryThe once ‘Critically Endangered’ Seychelles Magpie-robin was down to just 12 individuals in 1960 on one island of the granitic Seychelles. In 2015, due to intensive long-term management the population stands at around 280 birds on five islands, marking a significant success for this species. Translocations to the islands of Cousin and Cousine have led to population saturation and stability, a translocation to Denis Island has resulted in a continuing population increase and the founder population on Frégate Island is likewise increasing. The latest translocation to Aride Island in 2002 resulted in population increase then stability but is now showing a steep decline throughout 2014 into 2015. Reasons for this decline are yet unknown though disease, lack of recruitment, the impacts of social conflict and the possibility of genetic issues are discussed. This report summarises the history of management for this species, compiling all available published and unpublished information, to provide a comprehensive account of the Seychelles Magpie-robin recovery.

Effects of dispersal on local population increase

2000 ◽  
Vol 3 (6) ◽  
pp. 479-482 ◽  
Author(s):  
J.M. Kean ◽  
N.D. Barlow
Keyword(s):  
Local Population ◽  
Population Increase

Three hundred years of House Sparrow (Passer domesticus) persecution in Germany

2007 ◽  
Vol 34 (2) ◽  
pp. 307-317 ◽  
Author(s):  
J. SEITZ
Keyword(s):  
Rural Areas ◽  
House Sparrow ◽  
Bird Species ◽  
Passer Domesticus ◽  
Second World War ◽  
Population Increase ◽  
World War ◽  
Large Numbers ◽  
Urban And Rural Areas ◽  
Second World

Modernization of agriculture, economic development and population increase after the end of the Thirty Years' War caused authorities in many parts of Germany to decree the eradication of so-called pest animals, including the House Sparrow. Farmers were given targets, and had to deliver the heads of sparrows in proportion to the size of their farms or pay fines. At the end of the eighteenth century German ornithologists argued against the eradication of the sparrows. During the mid-nineteenth century, C. L. Gloger, the pioneer of bird protection in Germany, emphasized the value of the House Sparrow in controlling insect plagues. Many decrees were abolished because either they had not been obeyed, or had resulted in people protecting sparrows so that they always had enough for their “deliveries”. Surprisingly, various ornithologists, including Ernst Hartert and the most famous German bird conservationist Freiherr Berlepsch, joined in the war against sparrows at the beginning of the twentieth century, because sparrows were regarded as competitors of more useful bird species. After the Second World War, sparrows were poisoned in large numbers. Persecution of sparrows ended in Germany in the 1970s. The long period of persecution had a significant but not long-lasting impact on House Sparrow populations, and therefore cannot be regarded as a factor in the recent decline of this species in urban and rural areas of western and central Europe.

Successful removal of parathyroid cancer metastasis from VI thoracic vertebra

2019 ◽  
Author(s):  
Natalia Mokrysheva ◽  
Julia Krupinova ◽  
Anna Gorbacheva ◽  
Valeriy Teplyakov ◽  
Pavel Rumyantsev
Keyword(s):  
Cancer Metastasis ◽  
Thoracic Vertebra ◽  
Parathyroid Cancer ◽  
Successful Removal

Veränderungen der epiphytischen Flechtenflora im Stadtgebiet von Rostock zwischen 1994/1995 und 2017/2018

2020 ◽  
Vol 57 ◽  
pp. 3-34
Author(s):  
Ulf Schiefelbein ◽  
Frieda Engel ◽  
Franziska Masberg ◽  
Svea Lübke ◽  
Johann Schiefelbein ◽  
...  
Keyword(s):  
Urban Area ◽  
Lichen Species ◽  
Population Increase ◽  
City Centre ◽  
Acer Pseudoplatanus ◽  
Residential Areas ◽  
Epiphytic Lichen ◽  
Green Areas ◽  
Xanthoria Parietina ◽  
Lichen Flora

Die Flechtendiversität und -quantität wurde in den Jahren 2017/2018 in Rostock an 53 Bäumen erfasst. Die Ergebnisse wurden mit den Ergebnissen einer Kartierung von 1994/1995 verglichen. Ferner wurden die Feuchtigkeitsverhältnisse und der Grad der Eutrophierung bzw. die Luftqualität an den Bäumen der Gattungen Tilia und Acer anhand des bekannten Verhaltens der nachgewiesenen Flechten bezüglich Luftfeuchtigkeit/Niederschlägen, Eutrophierung und pH-Verhältnissen bewertet. 2017/2018 wurden 79 Flechtenarten und 14 lichenicole Pilzarten nachgewiesen. Die Gesamtzahl der im Untersuchungsgebiet nachgewiesenen epiphytischen Flechtenarten erhöhte sich damit auf 80. Die meisten Flechtenarten kommen an Tilia spec. (60), Acer pseudoplatanus (43) und A. platanoides (34) vor. Die häufigsten Arten sind Phaeophyscia orbicularis, Physcia adscendens, Ph. tenella und Xanthoria parietina. Candelariella xanthostigmoides, Flavoparmelia soredians, Hyperphyscia adglutinata, Intralichen lichenum, Lecanora subcarpinea, Parmelia serrana, Parmelina quercina und Taeniolella delicata sind Neufunde für Mecklenburg-Vorpommern. Hinsichtlich der Verbreitung und des Charakters der Fundorte können die nachgewiesenen Flechten und lichenicolen Pilze drei Gruppen zugeordnet werden: 1. Arten, die auch an stark befahrenen Straßen oder in eng bebauten Wohngebieten mit wenig Grünflächen und in den Stadtgebieten Kröpeliner Tor-Vorstadt oder Stadtmitte vorkamen, 2. Arten, die auch noch in locker bebauten, grünreichen Wohngebieten und in kleineren Grünlagen der Neubaugebiete vorkamen, aber nicht mehr in der Kröpeliner Tor-Vorstadt und Stadtmitte nachgewiesen wurden, 3. Arten, die nur an Bäumen vorkamen, die sich in der Nähe zum Offenland befinden. Der ersten Gruppe wurden 22, der zweiten Gruppe 32 und der dritten Gruppe 25 Flechtenarten zugeordnet. Dem Verhältnis zwischen der Frequenzsumme der stark nitrophytischen Arten und der Frequenzsumme der a-, schwach und mäßig nitrophytischen Arten auf den Bäumen entsprechend, wird die Luftqualität an 15 Bäumen der Gattungen Acer und Tilia für gut, an 14 Bäumen für mäßig und an 13 Bäumen für schlecht befunden. Auf der Grundlage des Verhältnisses zwischen der Anzahl basiphytischer Arten und der Summe an Arten an sauren oder/und subneutralen Borken wurden sechs Standorte als wenig, 21 Standorte als mäßig und 15 Standorte als stark schadstoffbelastet eingestuft. Meso- bis hygrophytische Flechten kamen an zehn Standorten mit nur ein oder zwei Arten, an 21 Standorten mit drei bis fünf Arten und an elf Standorten mit mehr als fünf Arten vor. Die epiphytische Flechtenflora hat sich in Rostock seit 1995 gravierend verändert. Es nahmen 69 Flechten im Bestand zu, von denen sich 52 Arten erst nach 1995 angesiedelt haben. Bei 32 Flechten ist eine schwache, bei 19 Flechten eine mäßige und bei 18 Flechten eine starke Zunahme zu verzeichnen. Lecanora conizaeoides kam 2017/2018 nicht mehr vor, vier Arten haben im Bestand abgenommen. Changes in the epiphytic lichen flora in the urban area of Rostock between 1994/1995 and 2017/2018 In 2017/2018, diversity and quantity of lichens were studied on 53 trees in Rostock city. The results were compared with the results of a mapping project in 1994/1995. Humidity conditions and degree of eutrophication at trees of the genera Tilia and Acer were interpreted with reference to the known indicator characteristcs of the lichen species concerning air humidity/precipitation, eutrophication and pH conditions. In 2017/2018, 79 lichen species and 14 lichenicolous fungus species were found. The total number of lichens increased to 80 species. Most species were found on Tilia spec. (60), Acer pseudoplatanus (43) and A. platanoides (34). The most common species are Phaeophyscia orbicularis, Physcia adscendens, Ph. tenella and Xanthoria parietina. Candelariella xanthostigmoides, Flavoparmelia soredians, Hyperphyscia adglutinata, Intralichen lichenum, Lecanora subcarpinea, Parmelia serrana, Parmelina quercina and Taeniolella delicata are new to Mecklenburg-Western Pomerania. The distribution and characteristics of the collection sites allow for deviding the species into three groups: 1. species also present along streets with heavy traffic or in densely populated residential areas with a lack of green areas and in the districts Kröpeliner Tor-Vorstadt or City Centre, 2. species still present in sparse residential areas and smaller green areas but not in the districts Kröpeliner Tor-Vorstadt or City Centre, 3. species only colonizing trees close to the open landscape. Twenty-two species were assigned to the first, 32 species to the second and 25 species to the latter group. According to the proportion between the sum of frequencies of the strongly nitrophytic lichens and the sum of frequencies of the anitrophytic and moderately nitrophytic lichens on trees, air quality was indicated to be good at 15 trees of the genera Acer and Tilia, moderate at 14 trees and bad at 13 trees. Based on the proportion between the number of basiphytic lichen species and the sum of species colonizing acidophytic and subneutrophytic bark, six locations were categorized as little, 21 locations as moderately and 15 locations as strongly polluted. Mesophytic or hygrophytic lichens were present with only one or two species at ten locations, three to five species at 21 locations and over five species at 11 locations. Within the period under consideration, the epiphytic lichen flora of the Rostock urban area changed considerably. The populations of 69 lichen species increased, with 52 lichens newly establishing after 1995. In 32 lichen species a slight, in 19 species a moderate, and in 18 species a strong population increase was recorded. Lecanora conizaeoides disappeared and the populations of four species decreased.

Genetic Diversity and Structure of the Nile Soft-Shelled Turtle (Trionyx triunguis) Along the Mediterranean coast of Turkey

2020 ◽  
Vol 27 (6) ◽  
pp. 307-315
Author(s):  
Özgür Güçlü ◽  
Bülent Bozdoğan
Keyword(s):  
Microsatellite Loci ◽  
Geographic Distance ◽  
Iucn Red List ◽  
Genetic Variations ◽  
Mediterranean Coast ◽  
Critically Endangered ◽  
Mediterranean Populations ◽  
Genetic Diversity And Structure ◽  
Polymorphic Microsatellite ◽  
The Mediterranean

The Nile soft-shelled turtle (Trionyx triunguis) is distributed between Dalyan and Samandağ throughout the Mediterranean coast in Turkey. The Mediterranean subpopulation of the Nile soft-shelled turtle is listed as critically endangered in the IUCN Red List Categories. This investigation aimed to determinate levels of genetic variations and patterns of genetic structures among Mediterranean populations in Turkey by using T. triunguis-specific microsatellite primers. A total of 13 polymorphic microsatellite loci were studied among samples of 121 individuals collected from five populations in Turkey. Of 13 polymorphic microsatellite loci used, 3 new were identified in this study. The genetic differentiation among the 5 studied populations of T. triunguis was significant (p 0.001). The analysis of molecular variance (AMOVA) indicated that genetic variations occurred mainly within populations (89.7%) rather than among populations (10.3%). Structure analysis showed presence of two main groups among the Mediterranean T. triunguis populations. However genetic variations among populations were not correlated with geographic distance between the locations. Analysis of data showed that one of the populations (Dalyan) had undergone a bottleneck effect. Migration analysis indicates that T. triunguis migrates between five Mediterranean populations in Turkey. We concluded that based on our results the status of ‘critically endangered’ of T. triunguis should be maintained. Long term population genetic survey studies should be undertaken and changes in habitats of T. triunguis populations, as well as their population size and structure should be monitored for each population to be able to establish a clear strategy for protection of T. triunguis.

Sign in / Sign up

Export Citation Format

Share Document