INCT-APA Annual Activity Report最新文献_第6页

Responses of an Antarctic Southern Giant Petrel Population to Climate Change 南极巨型海燕种群对气候变化的响应

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.066

L. Krüger, M. Sander, M. Petry

引用次数: 6

Background values and assessment of fecal steroids discharged into two inlets (mackelar and ezcurra) in Admiralty Bay, King George Island, Antarctica 南极洲乔治国王岛Admiralty湾两个入口(mackelar和ezcurra)粪便类固醇的背景值和评估

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.041

S. N. Aguiar, L. M. M. Ceschim, Edna Wisnieski, C. Martins

{"title":"Background values and assessment of fecal steroids discharged into two inlets (mackelar and ezcurra) in Admiralty Bay, King George Island, Antarctica","authors":"S. N. Aguiar, L. M. M. Ceschim, Edna Wisnieski, C. Martins","doi":"10.4322/APA.2014.041","DOIUrl":"https://doi.org/10.4322/APA.2014.041","url":null,"abstract":"Steroids are efficient geochemical markers of natural and anthropogenic environmental events, because they present stability and resistance to the degradation process, keeping a record of their signature origin, allowing interpretations about the organic matter sources. The Antarctic region is considered one of the best preserved environments in the world; however human activities have resulted in changes in this pristine location. Sampling was collected during the 2006/07 austral summer at three points: Refuge II (REF) (Mackelar Inlet), Thomas Point (PTH) and Barrel Point (BAR) (Ezcurra Inlet). After Soxhlet extraction, clean up using adsorption column and derivatization, steroids concentrations were determined by gas chromatography with flame ionization detector (GC-FID). Concentrations of fecal sterols (coprostanol and epicoprostanol) in all locations studied were <0.10 μg.g–1, suggesting natural contributions of these compounds. This statement is corroborated by values found for the coprostanol/epicoprostanol ratio for all cores (<2.50). Based on these results, background values were established for the analyzed compounds in the two studied inlets. The values for REF, PTH and BAR were, respectively, (0.06 ± 0.02), (0.04 ± 0.03) and (0.03 ± 0.01) for coprostanol + epicoprostanol.","PeriodicalId":169975,"journal":{"name":"INCT-APA Annual Activity Report","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127494345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plant communities from ice-free areas of demay point, King George Island, Antarctica 南极洲乔治国王岛德梅点无冰区的植物群落

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.024

A. Pereira, M. R. Francelino, V. M. Stefenon, A. L. Schünemann, L. Roesch

{"title":"Plant communities from ice-free areas of demay point, King George Island, Antarctica","authors":"A. Pereira, M. R. Francelino, V. M. Stefenon, A. L. Schünemann, L. Roesch","doi":"10.4322/APA.2014.024","DOIUrl":"https://doi.org/10.4322/APA.2014.024","url":null,"abstract":"This research presents the study of plant communities in ice-free areas of Demay Point, which is located at the south of the Admiralty Bay, King George Island, Antarctica. The aim of this research was to collect data about the plant coverage, classification and distribution of plant communities, contributing with the evaluation of possible environmental impacts of anthropogenic or natural origin, following the evolution of such communities over the length of time. The study started with the classification and description of the plant communities based mainly on the plant physiognomy, biodiversity and the relation with local abiotic factors. Each community was mapped with an Astech Promark II DGPS and the data was processed using AstechSolutions software to obtain sub-metric accuracy. Seven plant communities were identified and described as: 1 Grass and cushion chamaephyte formation; 1.2 Deschampsia and mosses subformation; 2 Moss carpet formation; 3 Moss hummock formation; 4 Moss tuft formation; 5 Fruticose lichen and moss tuft formation and 6 Fellfield communities. These plant communities are shown in a map, with their description.","PeriodicalId":169975,"journal":{"name":"INCT-APA Annual Activity Report","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126545506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

EPILITHIC FRESHWATER DIATOMS FROM ELEPHANT ISLAND, SOUTH SHETLANDS, ANTARCTICA 南极南设得兰群岛象岛的石屹淡水硅藻

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2015.012

Juliana Ferreira da Silva, M. A. Oliveira, A. Pereira, C. K. Pereira, Cristiane Barbosa D Oliveira

引用次数: 0

Biparental Care of Chinstrap Penguin: Molecular Sexing and Life History in the South Shetland Islands, Antarctica 南极南设得兰群岛帽带企鹅的双亲抚育:分子性别和生活史

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/apa.2014.101

Jaqueline Brummelhaus, V. Valiati, M. Petry

引用次数: 0

Summer Variation of Zooplankton Community on Coastal Environment of Admiralty Bay, King George Island, Antarctica 南极乔治王岛金钟湾海岸环境浮游动物群落夏季变化

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.072

Yargos Kern, K. L. Elbers, A. C. Cruz-Kaled, R. R. Weber, T. Absher

引用次数: 2

Atmospheric Changes Observed in Antarctica Related to the Sun-Earth Interactions 南极观测到的与太阳-地球相互作用有关的大气变化

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.055

E. Correia, J. Raulin, P. Kaufmann, H. R. Gavilán

引用次数: 0

The role of early diagenesis in the sedimentary steroids around Penguin Island, Antarctica 早期成岩作用在南极企鹅岛周围沉积类固醇中的作用

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.042

L. M. M. Ceschim, R. Montone, C. Martins

{"title":"The role of early diagenesis in the sedimentary steroids around Penguin Island, Antarctica","authors":"L. M. M. Ceschim, R. Montone, C. Martins","doi":"10.4322/APA.2014.042","DOIUrl":"https://doi.org/10.4322/APA.2014.042","url":null,"abstract":"The role of lipids in polar environments is of primary importance for understanding the cycling of carbon organic and associated elements. Thus, the knowledge of the nature and quality of organic matter is necessary to evaluate the overall impact in this area and to model the carbon cycle. The aim of this study was to determine the transformations of organic matter in the marine environment by analysis of a specific group of lipid biogeochemical markers, the sedimentary steroids. Sediment cores were collected during the 2007/08 austral summer in the vicinity of the Penguin Island (2 cores). In general, the cores were sectioned at 1 cm intervals and the steroids analyzed by gas chromatography with flame ionization detection (GC-FID), after Soxhlet extraction, adsorption column chromatography and derivatization. The results showed that organic matter had been subjected to extensive degradation and transformation with depth in the two corers and the general increase of the stanol/ stenol ratio may have represented the progressive reduction of stenols to stanols within the deepest sediment layers. According to the linear regression (R2) applied, the process at Penguin Island is governed by a natural supply, and a random pattern in the concentration values with increasing depth. These results contribute to the understanding of the current processes of organic matter transformation in this important region of Antarctic environment.","PeriodicalId":169975,"journal":{"name":"INCT-APA Annual Activity Report","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131738837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Baseline Studies on Plasmatic Constituents in the Notothenia Rossii and Notothenia Coriiceps in Admiralty Bay, King George Island, Antarctica 南极乔治王岛金钟湾Rossii和Coriiceps Notothenia血浆成分的基线研究

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.079

E. Rodrigues, M. Feijó-Oliveira, S. V. Gannabathula, C. N. K. Suda, C. S. Carvalho, L. Donatti, H. P. Lavrado

{"title":"A Baseline Studies on Plasmatic Constituents in the Notothenia Rossii and Notothenia Coriiceps in Admiralty Bay, King George Island, Antarctica","authors":"E. Rodrigues, M. Feijó-Oliveira, S. V. Gannabathula, C. N. K. Suda, C. S. Carvalho, L. Donatti, H. P. Lavrado","doi":"10.4322/APA.2014.079","DOIUrl":"https://doi.org/10.4322/APA.2014.079","url":null,"abstract":"e Antarctic Peninsula, a pristine natural system has been found to be very sensitive to changes in the environment arising from climate changes and anthropic activities. e plasmatic levels of various metabolic constituents in sh have been used to identify the e ect of environmental changes. e present study aims to establish base line of plasmatic constituents (glucose, triglycerides, cholesterol, total protein and albumin) concentrations in two Antarctic sh species, Notothenia rossii and Notothenia coriiceps, which are abundant in Admiralty Bay, King George Island, Antarctica. Blood sample collection was done by caudal vessel puncture immediately a er capture. Plasmatic levels of glucose, triglycerides and cholesterol were signi cantly higher in N. rossii, at Refuge 2 compared to the other two sites, whereas there was no signi cant di erence in albumin and total protein concentrations from the three sites. For N. coriiceps, only the albumin levels were higher at Refuge 2 compared to the other sites. e di erences in the plasma constituent’s levels may be due to the physical and chemical di erences in marine environments at sampling sites, as well as the morphological and lifestyle behavior of the two sh species.","PeriodicalId":169975,"journal":{"name":"INCT-APA Annual Activity Report","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133081900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Plankton structure a in shallow coastal zone at Admiralty Bay, King George Island, West Antarctic Peninsula (WAP): pico, nano and microplankton and chlorophyll biomass 西南极半岛乔治王岛金钟湾浅海岸带浮游生物结构a:微、纳米、微浮游生物和叶绿素生物量

INCT-APA Annual Activity Report Pub Date : 1900-01-01 DOI: 10.4322/APA.2014.033

D. R. Tenenbaum, J. J. Barrera-Alba, Renatha Barboza Duarte, M. Tenório

{"title":"Plankton structure a in shallow coastal zone at Admiralty Bay, King George Island, West Antarctic Peninsula (WAP): pico, nano and microplankton and chlorophyll biomass","authors":"D. R. Tenenbaum, J. J. Barrera-Alba, Renatha Barboza Duarte, M. Tenório","doi":"10.4322/APA.2014.033","DOIUrl":"https://doi.org/10.4322/APA.2014.033","url":null,"abstract":"The phytoplankton composition and biomass are being monitored in Admiralty Bay, Antarctic Peninsula since 2002 to detect possible interannual changes on a long-term perspective. In this report, we present the preliminary results of the 2009/2010 monitoring program regarding phytoplankton size-structure and biomass. Even if mean microplankton densities were similar between December 2009 and February 2010, diferent phytoplankton groups dominated each sampling period. Pennate diatoms showed highest contribution in December, whereas athecate dinoflagellates were the most abundant microplanktonic group in February. Pico and nanoplankton were only detailed during the second sampling period, and results showed that phytoplankton were dominated by cells <10 μm (~104 and 107 cells.L–1, respectively). The shift in phytoplankton structure pointed out by the dominance of picoand nano-size cells in phytoplankton and heterotrophic dinoflagellates in late summer must be confirmed by continuing the long-term monitoring program and the implementation of microvariation sampling effort to identify the factors that are actually influencing phytoplankton populations in this environment.","PeriodicalId":169975,"journal":{"name":"INCT-APA Annual Activity Report","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132276125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7