scholarly journals A ANTA (Tapirus terrestris) EM FRAGMENTOS DE FLORESTA COM ARAUCÁRIA, PARANÁ, BRASIL

FLORESTA ◽  
2011 ◽  
Vol 41 (4) ◽  
Author(s):  
Gisley Paula Vidolin ◽  
Daniela Biondi ◽  
Adilson Wandembruck
Keyword(s):  
Spatial Distribution ◽  
Landscape Ecology ◽  
Relative Density ◽  
Relative Abundance ◽  
Population Decline ◽  
Forest Fragments ◽  
Abundance Index ◽  
Ecological Corridor ◽  
Tapirus Terrestris ◽  
Spatial Section

Este estudo teve como objetivo conhecer o tamanho e área de uso, abundância relativa e distribuição espacial da anta no Corredor Ecológico Araucária. Para tanto, a pesquisa foi conduzida em 14 propriedades localizadas em um recorte espacial de 659 km2, situado entre as coordenadas geográficas 26°26’35’’ de latitude S, 51°46’10’’ de longitude W e 26°12’19’’ de latitude S, 51°24’45’’ de longitude W. O método de amostragem utilizado consistiu no mapeamento dos pontos de ocorrência da anta, tendo como base entrevista com moradores locais e a busca por indícios, como pegadas, carreiros e outros sinais que atestassem a sua presença nas áreas amostrais. As áreas foram visitadas mensalmente ao longo do período de 18 meses, de janeiro de 2007 a julho de 2008, e todos os pontos (UTM) onde foram encontrados sinais da espécie foram marcados em GPS e, posteriormente, plotados em mapa. Os pontos extremos foram unidos, resultando em um polígono de área de uso dos animais, o qual teve sua área calculada no programa ArcMap versão 9.2. O índice de abundância relativa foi estimado com base em todos os eventos em que a espécie foi visualizada e que os animais puderam ser contabilizados, considerando-se os registros individualizados para cada propriedade. Obteve-se a estimativa de uma média de quatro indivíduos para a região numa área de 4.314 ha ou 43 km2. Essa densidade relativa obtida pode ser considerada baixa. Possivelmente, a caça seja a principal causa do declínio populacional da espécie na região estudada.Palavras-chave: Corredor ecológico; paisagem; ecologia da paisagem. AbstractThe tapir (Tapirus terrestris) in forest fragments with Araucária in Paraná, Brazil. This study aimed to investigate the using area for use of tapir (Tapirus terrestris) along the Araucaria Ecological Corridor in relation to abundance, spatial distribution and area size. The research was carried out on 14 properties located on a spatial section of 659 km2 situated between the coordinates of 26°26’35” latitude S and 51°46’10” longitude W, and 26°12’19” latitude S and 51°24’45” longitude W. The points of occurrence of tapir were mapped based on interviews with local inhabitants and on tracks, paths, and other signs of its presence in the sampling areas. The areas were visited monthly during a period of 18 months. The points (UTM) where signs of the species were found had been marked by GPS and plotted on the map. The index of relative abundance was estimated based on all the events in which the specie was seen. Considering the values of relative abundance index for both groups of tapir studied, it was estimated an average of four individuals for an area of 4.314 ha or 43 km2.The relative density obtained was considered low. It is possible that hunting is the main cause of the population decline of the species in the studied region.Keywords: Ecological corridor; landscape; landscape ecology.

scholarly journals Occurrence and Abundance of Dermacentor reticulatus in the Habitats of the Ecological Corridor of the Wieprz River, Eastern Poland

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 96
Author(s):  
Zbigniew Zając ◽  
Aleksandra Sędzikowska ◽  
Weronika Maślanko ◽  
Aneta Woźniak ◽  
Joanna Kulisz
Keyword(s):  
Relative Abundance ◽  
Tick Species ◽  
Dermacentor Reticulatus ◽  
Natural Vegetation ◽  
High Abundance ◽  
Migration Routes ◽  
Ecological Corridors ◽  
Tick Activity ◽  
Ecological Corridor

Ecological corridors are zones of natural vegetation, which connect with other vegetation strips to create migration routes for animals and plants. The aim of our study was to investigate the occurrence and relative abundance of Dermacentor reticulatus in various habitats of the ecological corridor of the Wieprz River in eastern Poland. Ticks were collected using the flagging method in seven sites within the ecological corridor of the Wieprz River, i.e., one of the longest uninterrupted vegetation strips in eastern Poland. The presence of D. reticulatus adults was confirmed in each of the examined sites. The autumn peak of tick activity dominated in most plots. During this period, on average up to 309.7 individuals were collected within 30-min. The results of our study show that, due to the high abundance of local D. reticulatus populations, the habitats located in the ecological corridor of the Wieprz River can be regarded as preferred habitats of this tick species.

scholarly journals Abundance and composition of the medium to large-sized mammals in a private area of a REDD+ project in Acre, Brazil

2018 ◽  
Vol 18 (3) ◽  
Author(s):  
André Luis Moura Botelho ◽  
Luiz Henrique Medeiros Borges ◽  
Brian McFarland
Keyword(s):  
Gene Flow ◽  
Ecosystem Services ◽  
Relative Abundance ◽  
Rare Species ◽  
Camera Traps ◽  
Large Mammals ◽  
Conservation Areas ◽  
Conservation Units ◽  
Key Species ◽  
Tapirus Terrestris

Abstract: The implementation of private areas focused on conservation of species and habitats, combined with REDD+ policies, has become an important ally for biodiversity conservation, expanding the conservation areas of the most varied habitats, covering key groups such as large mammals, which are extremely important for the maintenance of ecosystem services. In the upper region of the Purus River in Acre, Brazil, an inventory was carried out using camera-traps, of medium and large mammals community in a private REDD+ area, known as the Purus Project. A total of 19 species of mammals were recorded with an effort of 1859 trap-nigths, including rare, endangered and key species. It is estimated that the richness for the area is of 22 species. Endangered and rare species such as the tapir (Tapirus terrestris) and the short-eared dog (Atelocynus microtis) presented high rates of relative abundance compared to other Conservation Units (UCs). The richness of medium to large-sized mammals recorded in the Purus Project underscores the importance of REDD+ in private areas for the conservation of this group, given the challenges for inclusion and creation of new protected areas. REDD+ projects in privates' areas become an important component for conservation of species and the connection between public conservation units favoring the spread of species and populations between areas, and consequently the gene flow.

scholarly journals Forest fragmentation in the landscape in the Atlantic Forest Biome: A systematic review of the literature

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Stephany Diolino Cunha ◽  
Bruna Sampaio Crivilin ◽  
Matheus da Silva Araújo ◽  
Luís Antônio Coimbra Borges
Keyword(s):  
Systematic Review ◽  
Landscape Ecology ◽  
Forest Fragmentation ◽  
Atlantic Forest ◽  
Forest Fragments ◽  
Review Of The Literature ◽  
Search Terms ◽  
High Degree ◽  
Forest Biome ◽  
Degree Of Fragmentation

Forest fragmentation is defined as the process by which a continuous area of habitat is reduced in size and divided between spaces. Therefore, due to the increase in these areas, this study aimed to conduct a systematic review of the literature on forest fragments in the Atlantic Forest biome in order to verify their main characteristics and landscape ecology. Publications in search platforms referring to the period from 2000 to 2020 were analyzed such as: SciELO, Google academic and CAPES journals portal. The search terms entered were: “Studies of forest fragments in the Atlantic Forest biome” and “Landscape ecology in forest fragments”. A total of 15 articles were selected from among the works found, and 5 of these were chosen to be evaluated in the present study. Four of the five works were carried out in the state of Espírito Santo, close to basins and sub-basins, and only one work was carried out in a state park. Thus, the evaluated works with the theme, study of fragmentation and ecology of the landscape showed a high degree of fragmentation, meaning that they have fragments smaller than 5 hectares; in addition, all fragments have an irregular edge effect. Therefore, measures aimed at the conservation of biodiversity are needed in all places so that there is ecological restoration of the landscape and conservation of fauna and flora in the Atlantic Forest biome. 

The spatial distribution and relative abundance of gap-junctional connexin40 and connexin43 correlate to functional properties of components of the cardiac atrioventricular conduction system

1993 ◽  
Vol 105 (4) ◽  
pp. 985-991 ◽  
Author(s):  
R.G. Gourdie ◽  
N.J. Severs ◽  
C.R. Green ◽  
S. Rothery ◽  
P. Germroth ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Relative Abundance ◽  
Atrioventricular Node ◽  
Conduction System ◽  
Atrioventricular Conduction ◽  
Purkinje Fibre ◽  
Purkinje Fibres ◽  
Atrioventricular Bundle ◽  
Junctional Protein ◽  
Gap Junctional

Electrical coupling between heart muscle cells is mediated by specialised regions of sarcolemmal interaction termed gap junctions. In previous work, we have demonstrated that connexin42, a recently identified gap-junctional protein, is present in the specialised conduction tissues of the avian heart. In the present study, the spatial distribution of the mammalian homologue of this protein, connexin40, was examined using immunofluorescence, confocal scanning laser microscopy and quantitative digital image analysis in order to determine whether a parallel distribution occurs in rat. Connexin40 was detected by immunofluorescence in all main components of the atrioventricular conduction system including the atrioventricular node, atrioventricular bundle, and Purkinje fibres. Quantitation revealed that levels of connexin40 immunofluorescence increased along the axis of atrioventricular conduction, rising over 10-fold between atrioventricular node and atrioventricular bundle and a further 10-fold between atrioventricular bundle and Purkinje fibres. Connexin40 and connexin43, the principal gap-junctional protein of the mammalian heart, were co-localised within atrioventricular nodal tissues and Purkinje fibres. By applying a novel photobleach/double-labelling protocol, it was demonstrated that connexin40 and connexin43 are co-localised in precisely the same Purkinje fibre myocytes. A model, integrating data on the spatial distribution and relative abundance of connexin40 and connexin43 in the heart, proposes how myocyte-type-specific patterns of connexin isform expression account for the electrical continuity of cardiac atrioventricular conduction.

Environmental Quality Assessment of Tibet Based on 3S

2013 ◽  
Vol 295-298 ◽  
pp. 692-695
Author(s):  
Xu Xia
Keyword(s):  
Land Use ◽  
Spatial Distribution ◽  
Landscape Ecology ◽  
Environmental Quality ◽  
Water Area ◽  
Distribution Characteristics ◽  
High Coverage ◽  
Ecological Index ◽  
Environmental Quality Assessment ◽  
Spatial Distribution Characteristics

TM and HJ remote images were applied to land use interpretation of Tibet on the platform of Erdas software. The spatial distribution characteristics of Tibet land use were analyzed based on Landscape Ecology theory and GIS. The Ecological Index (EI) was calculated to access Tibetan eco-environmental quality. To validate the interpretation accuracy, GPS was used in field checking. The results show: (1) the farmland area of Tibet is 0.66%t of whole area. Woodland area is 164938.29 km2( 13.71%). Grassland is 548651.10 km2 (45.60%). Water area with 84392.81 km2 is 7.01%. Urban land is 3020.20 km2 ( 0.25%). Unutilized land is 460847.68 km2 (32.765); (2) High coverage grasslands are mainly distributed in some southern Tibetan counties, such as Xigaz, Nyemo, Lhongzi, Naidong, Yatung, Gyantse and Renbu (3) among 73 counties, there are 44 counties’ environment is moderate level, 18 counties’ environment is good level. Just one county’s EI is excellent level.

Seasonal Distribution and Abundance of Dugongs in the Western-Gulf-of-Carpentaria

1989 ◽  
Vol 16 (2) ◽  
pp. 141 ◽  
Author(s):  
P Bayliss ◽  
WJ Freeland
Keyword(s):  
Relative Density ◽  
Relative Abundance ◽  
Coastal Waters ◽  
Seasonal Changes ◽  
Aboriginal People ◽  
Dry Season ◽  
Seasonal Distribution ◽  
Wet Season ◽  
Aerial Surveys ◽  
The 1960S

Aerial surveys of coastal waters (27 216 km2) in the western Gulf of Carpentaria during the dry season of 1984 and wet season of 1985 indicated no major seasonal changes in distribution and relative abundance of dugongs. Minimum population size in the dry season was estimated as 16 816 � 2946 (standard error), with a relative density of 0.62 k 0.11 km-2, and that for the wet season 16 846 + 3257, with a relative density of 0.62 � 0.12 km-2. The estimates exclude 5% of observations which could have been either dugongs or Irrawaddy dolphins, and were corrected for submerged dugongs and those missed on the surface. Dugongs were unevenly distributed over the study area, and neither mean group size nor proportion of calves varied between seasons. Dugong abundance was correlated with area of available seagrass. The catch rate of dugongs by Aboriginal people off Numbulwar decreased six-fold between the 1960s and 1985 (60 to 10 p.a.), possibly due to excessive hunting.

scholarly journals Population structure and spatial distribution of porbeagles (Lamna nasus) in Irish waters

2019 ◽  
Vol 76 (6) ◽  
pp. 1581-1590 ◽  
Author(s):  
Luke W J Cameron ◽  
William K Roche ◽  
Jonathan D R Houghton ◽  
Paul J Mensink
Keyword(s):  
Population Structure ◽  
Spatial Distribution ◽  
North Atlantic ◽  
Population Decline ◽  
The North ◽  
Aggregation Site ◽  
Show Evidence ◽  
Long Term Trends ◽  
Almost All

Abstract Porbeagles throughout the North Atlantic have experienced severe population decline through overfishing, with the northeastern population listed as critically endangered. Management of this population is constrained by the paucity of data on porbeagle population structure, distribution and behaviour in this region. Here we use a long-term (47 year) Irish capture-mark-recapture dataset to investigate the population structure, spatial distribution and seasonal movements of this species. From 1970–2017, a total of 268 sharks (9 recaptures) were ID tagged, with most individuals likely being juvenile based on length at maturity estimates (mean total length = 143.9 cm, SD = 35.4). Almost all captures were recorded at three distinct locations near angling hubs along the south, west and north coasts with catches peaking in August. Long-term trends in capture date indicated a shift towards earlier capture dates in the northern site (n = 153). Our findings suggest Irish waters may act as a persistent summer aggregation site for juveniles, which show evidence for seasonal site fidelity, returning to nearby locations between years. These findings demonstrate the utility of such programmes, which can be implemented, with minimal expense by engaging with the angling sector, to elucidate the population structure and distribution of wide-ranging fish species.

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