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Academic literature on the topic 'Abrolhos Archipelago'
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Journal articles on the topic "Abrolhos Archipelago"
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Squire, Peter, Renaud Joannes-Boyau, Anja M. Scheffers, et al. "A Marine Reservoir Correction for the Houtman-Abrolhos Archipelago, East Indian Ocean, Western Australia." Radiocarbon 55, no. 1 (2013): 103–14. http://dx.doi.org/10.2458/azu_js_rc.v55i1.16197.
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High-precision analysis using accelerator mass spectrometry (AMS) was performed upon known-age Holocene and modern, pre-bomb coral samples to generate a marine reservoir age correction value (ΔR) for the Houtman-Abrolhos Archipelago (28.7°S, 113.8°E) off the Western Australian coast. The mean ΔR value calculated for the Abrolhos Islands, 54 ± 30 yr (1 σ) agrees well with regional ΔR values for Leeuwin Current source waters (N-NW Australia-Java) of 60 ± 38 yr. The Abrolhos Islands show little variation with ΔR values of the northwestern and north Australian coast, underlining the dominance of the more equilibrated western Pacific-derived waters of the Leeuwin Current over local upwelling. The Abrolhos Islands ΔR values have remained stable over the last 2896 cal yr BP, being also attributed to the Leeuwin Current and the El Niño Southern Oscillation (ENSO) signal during this period. Expected future trends will be a strengthening of the teleconnection of the Abrolhos Islands to the climatic patterns of the equatorial Pacific via enhanced ENSO and global warming activity strengthening the Leeuwin Current. The possible effect upon the trend of future ΔR values may be to maintain similar values and an increase in stability. However, warming trends of global climate change may cause increasing dissimilarity of ΔR values due to the effects of increasing heat stress upon lower-latitude coral communities.
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Squire, Peter, Renaud Joannes-Boyau, Anja M. Scheffers, et al. "A Marine Reservoir Correction for the Houtman-Abrolhos Archipelago, East Indian Ocean, Western Australia." Radiocarbon 55, no. 01 (2013): 103–14. http://dx.doi.org/10.1017/s0033822200047834.
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High-precision analysis using accelerator mass spectrometry (AMS) was performed upon known-age Holocene and modern, pre-bomb coral samples to generate a marine reservoir age correction value (ΔR) for the Houtman-Abrolhos Archipelago (28.7°S, 113.8°E) off the Western Australian coast. The mean ΔR value calculated for the Abrolhos Islands, 54 ± 30 yr (1 σ) agrees well with regional ΔR values for Leeuwin Current source waters (N-NW Australia-Java) of 60 ± 38 yr. The Abrolhos Islands show little variation with ΔR values of the northwestern and north Australian coast, underlining the dominance of the more equilibrated western Pacific-derived waters of the Leeuwin Current over local upwelling. The Abrolhos Islands ΔR values have remained stable over the last 2896 cal yr BP, being also attributed to the Leeuwin Current and the El Niño Southern Oscillation (ENSO) signal during this period. Expected future trends will be a strengthening of the teleconnection of the Abrolhos Islands to the climatic patterns of the equatorial Pacific via enhanced ENSO and global warming activity strengthening the Leeuwin Current. The possible effect upon the trend of future ΔR values may be to maintain similar values and an increase in stability. However, warming trends of global climate change may cause increasing dissimilarity of ΔR values due to the effects of increasing heat stress upon lower-latitude coral communities.
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GARRAFFONI, ANDRÉ R. S., and ELISA M. COSTA. "Two new species of Polycirrus (Polychaeta, Terebellidae) from Abrolhos Archipelago, Brazil." Zootaxa 297, no. 1 (2003): 1. http://dx.doi.org/10.11646/zootaxa.297.1.1.
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Two new species of Polycirrus (Polychaeta, Terebellidae, Polycirrinae), Polycirrus abrolhensis sp. nov. and P. paivai sp. nov., are described from material collected in biogenic calcareous bottoms of algae, at Santa Bárbara Island, Abrolhos Archipelago, Brazil.
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RIBEIRO, SUZI M., and GUILHERME MURICY. "Four new sympatric species of Tethya (Demospongiae: Hadromerida) from Abrolhos Archipelago (Bahia State, Brazil)." Zootaxa 557, no. 1 (2004): 1. http://dx.doi.org/10.11646/zootaxa.557.1.1.
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Four new species of Tethya are described from coral reefs in Abrolhos Archipelago (Brazil). Tethya brasiliana sp. nov. is green or yellow externally, yellowish orange internally, and its micrasters are strongylasters, microspherasters and microoxyasters. Tethya cyanae sp. nov. is dark blue externally; its micrasters are tylasters, oxyasters and microoxyasters. Tethya ignis sp. nov. is orange externally and internally, and its micrasters are tylasters and completely microspined oxyasters. Tethya rubra sp. nov. is red or yellow externally, and it has tylasters and oxyasters with branched and twisted rays. Scanning electron microscopy of microscleres was essential for distinction of Brazilian species of Tethya. The diversity of Tethya from the Brazilian coast has increased from five to nine species. Abrolhos Archipelago harbors the greatest diversity of Tethya in the Atlantic, with four species, three of which are provisional endemics.
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Gennari, Solange M., Claudia Niemeyer, Herbert S. Soares, et al. "Seroprevalence of Toxoplasma gondii in seabirds from Abrolhos Archipelago, Brazil." Veterinary Parasitology 226 (August 2016): 50–52. http://dx.doi.org/10.1016/j.vetpar.2016.06.016.
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Morete, Maria E., Tatiana L. Bisi, Richard M. Pace, and Sergio Rosso. "Fluctuating abundance of humpback whales (Megaptera novaeangliae) in a calving ground off coastal Brazil." Journal of the Marine Biological Association of the United Kingdom 88, no. 6 (2008): 1229–35. http://dx.doi.org/10.1017/s0025315408000362.
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The humpback whale (Megaptera novaeangliae) population that uses Abrolhos Bank, off the east coast of Brazil as a breeding ground is increasing. To describe temporal changes in the relative abundance of humpback whales around Abrolhos, seven years (1998–2004) of whale count data were collected during July through to November. During one-hour-scans, observers determined group size within 9.3 km (5 n.m.) of a land-based observing station. A total of 930 scans, comprising 7996 sightings of adults and 2044 calves were analysed using generalized linear models that included variables for time of day, day of the season, years and two-way interactions as possible predictors. The pattern observed was the gradual build-up and decline in whale counts within seasons. Patterns and peaks of adult and calf counts varied among years. Although fluctuation was observed, there was generally an increasing trend in adult counts among years. Calf counts increased only in 2004. These fluctuations may have been caused by some environmental conditions in humpback whales' summering grounds and also by changes in spatial–temporal concentrations in Abrolhos Bank. The general pattern observed within the study area mirrored what was observed in the whole Abrolhos Bank. Knowledge of the consistency with which humpback whales use this important nursing area should prove beneficial for designing future monitoring programmes especially related to whale watching activities around Abrolhos Archipelago.
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Cavallari, Daniel Caracanhas, and Daniel Abbate. "New records and distribution extension of Nassarius karinae Usticke, 1971 (Mollusca: Gastropoda: Nassariidae) in the SW Atlantic." Check List 9, no. 6 (2013): 1533. http://dx.doi.org/10.15560/9.6.1533.
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We report two new records of Nassarius karinae Usticke, 1971, from Minerva Seamount and Abrolhos Archipelago, off northeastern Brazil. The new records extend the known geographic range of the species ca. 1000 km southward from Pernambuco to Bahia. These are also the first records of the species in Bahia. Additional notes on shell morphology and comparisons with other congeners are provided herein.
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RAMALHO, LAÍS V., PAUL D. TAYLOR, FERNANDO COREIXAS MORAES, RODRIGO MOURA, GILBERTO M. AMADO-FILHO, and ALEX C. BASTOS. "Bryozoan framework composition in the oddly shaped reefs from Abrolhos Bank, Brazil, southwestern Atlantic: taxonomy and ecology." Zootaxa 4483, no. 1 (2018): 155. http://dx.doi.org/10.11646/zootaxa.4483.1.6.
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Bryozoans are a key group of sessile invertebrates in some reef frameworks but are typically neglected in environmental monitoring programs. Abrolhos Bank (Brazil) is the largest reef complex in the South Atlantic Ocean, encompassing several reef landscapes over an area of 46,000 km2. A transition takes place across the shelf from mangroves to soft sediments, coastal shallow reefs to a volcanic archipelago – surrounded by fringing reefs – and unique mushroom-shaped biogenic structures, with mesophotic pinnacle reefs, rhodolith beds, sink-holes and shelf break deep environments. The taxonomic composition of the bryozoan fauna was studied in 11 core samples taken from shallow to mesophotic mid-shelf reefs (4–25 m deep) on Abrolhos Bank by divers using a submersible drill. Of the 20 bryozoan species sampled, 17 are new records for Abrolhos Bank and seven species are new to science: Crassimarginatella winstonae n. sp., Parasmittina distincta n. sp., Parasmittina abrolhosensis n. sp., Hemismittoidea asymmetrica n. sp., Stylopoma variabilis n. sp., Stylopoma hastata n. sp., and Plesiocleidochasma acuminata n. sp. (described by Ramalho, Taylor & Moraes). The most conspicuous species is Celleporaria atlantica. These results increase to 48 the total number of bryozoan species known in this region and reinforce the importance of this group as one of the main components apart from crustose coralline algae and corals of the reef framework-building community of Abrolhos Bank.
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ROCHA, C. F. D., G. F. DUTRA, D. VRCIBRADIC, and V. A. MENEZES. "The terrestrial reptile fauna of the Abrolhos Archipelago: species list and ecological aspects." Brazilian Journal of Biology 62, no. 2 (2002): 285–91. http://dx.doi.org/10.1590/s1519-69842002000200013.
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We have studied the terrestrial reptile fauna of the Abrolhos Archipelago (a group of five islands located ca. 70 km off the southern coast of the State of Bahia, Brazil) and analyze here some of its ecological aspects such as diet, thermal ecology, activity, and some reproductive parameters. Three lizards comprise the archipelago's terrestrial reptile fauna: Tropidurus torquatus (Tropiduridae), Mabuya agilis (Scincidae), and Hemidactylus mabouia (Gekkonidae). The first two are diurnal and the latter is crepuscular/nocturnal (initiating activity at ca. 17:30). The activity period of T. torquatus extended from 5:30 to 18:30 h. Mean field body temperatures of active T. torquatus, M. agilis, and H. mabouia were, respectively, 34.0 ± 3.7ºC (range 23.8-38.0ºC; N = 75), 34.5 ± 2.2ºC (range 30.8-37.0ºC; N = 6), and 26.3 ± 1.1ºC (range 24.8-28.0ºC; N = 8). The predominant prey items in the diet of T. torquatus were ants, coleopterans, and hemipterans. In the diet of M. agilis, coleopterans were the most frequent prey items. For H. mabouia, the most important dietary items were orthopterans. Clutch size of T. torquatus averaged 4.1 ± 1.1 (range 2-6; N = 15) and was significantly related to female size (R² = 0.618; p = 0.001; N = 15). Clutch size for H. mabouia was fixed (two) and mean litter size of the viviparous M. agilis was 3.3 ± 0.6 (range 3-4; N = 3). Tropidurus torquatus and H. mabouia deposit their eggs under rocks in the study area, with the former burying them but not the latter; in both species, more than one female often oviposit under the same rock.
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Morete, Maria E., Tatiana L. Bisi, and Sergio Rosso. "Temporal pattern of humpback whale (Megaptera novaeangliae) group structure around Abrolhos Archipelago breeding region, Bahia, Brazil." Journal of the Marine Biological Association of the United Kingdom 87, no. 1 (2007): 87–92. http://dx.doi.org/10.1017/s0025315407054616.
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To characterize temporal patterns of humpback group structure around Abrolhos Archipelago, Brazil, seven years (1998–2004) of data obtained from July through November were analysed. During one-hour scans, observers determined group composition within 9.3 km around a land-based station. A total of 930 scans, comprising 4288 groups were analysed. Seven group categories were identified and their frequencies were 14.6% of 1AD (lone whale), 25.2% of DYAD (two adult whales), 7.3% of TRIO (three adult whales), 5.2 of TRIO+ (more than three adults), 24.9% of MOC (mother and calf), 19.6% of MOCE (mother, calf and one escort), and 3.1% of MOCE+ (mother, calf and more than one escort). Proportions of whale-group categories did not change between morning and afternoon, nor among years. However, as the season progressed, groups with calves increased while groups without calves decreased. This progression may be explained by the segregated migration patterns of humpback whales and also by changes in the social status of individuals. The Abrolhos Reef provides protection from the prevailing winds, which may explain the higher proportion of groups with calves in the area.
Dissertations / Theses on the topic "Abrolhos Archipelago"
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Bisi, Tatiana Lemos. "Comportamento de filhotes de baleia jubarte, Megaptera novaeangliae, na região ao redor do Arquipélago dos Abrolhos, Bahia (Brasil)." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-20082007-112756/.
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A fim de caracterizar o comportamento de filhotes de baleia jubarte, este estudo foi conduzido ao redor do Arquipélago dos Abrolhos, um importante sítio de nascimento e cria da espécie no Brasil. Foram investigados aspectos do desenvolvimento comportamental dos filhotes, diferenças comportamentais entre filhotes nascidos em diferentes temporadas reprodutivas e, também, a influência da presença de um escorte no comportamento dos filhotes. Os dados foram coletados entre os anos de 1998 a 2004, entre os meses de julho a novembro, a partir de um ponto fixo de observação no topo da Ilha de Santa Bárbara, no Arquipélago dos Abrolhos. O método utilizado foi o de amostragem de animal focal, com registro de todos os eventos e estados comportamentais realizados pelos filhotes, com o auxilio de um teodolito. 207 observações focais foram analisadas, totalizando 313,65 horas de amostragem. Os filhotes apresentaram um repertório comportamental bastante diverso e com uma grande variação quanto à taxa de ocorrência. Os eventos mais freqüentes foram ARQUEAMENTO DO PEDÚNCULO, SALTO, EXPOSIÇÃO DE UM LOBO DA CAUDAL e BATIDA DE CAUDAL; os poucos freqüentes ou raros foram SLASH DE CAUDAL, BARRIGA PARA CIMA, ACENANDO e ALONGAMENTO DO PEDÚNCULO. Entre os estados comportamentais, os filhotes permaneceram a maior parte do tempo em NATAÇÃO, sendo observado em média 42,21% do tempo. MILLING foi o segundo estado mais freqüente (média: 29,86%), seguido de REPOUSO (média: 20,91%) e ATIVO (média: 7,02%). A alta freqüência de ocorrência de alguns eventos e o tempo gasto em NATAÇÃO sugerem a importância desses comportamentos no desenvolvimento da coordenação e aptidão motora, fortalecimento da musculatura e melhora da resistência nos filhotes. Dessa maneira, os filhotes desenvolvem habilidades necessárias para interações sociais futuras e reprodução e, também, para necessidades do momento, como o desenvolvimento da relação com a mãe, amamentação e preparação para a migração. A análise do comportamento dos filhotes nas três fases da temporada reprodutiva mostrou que os filhotes aumentaram a taxa de ocorrência dos eventos ARQUEAMENTO DO PEDÚNCULO, EXPOSIÇÃO DE CABEÇA, BATIDA DE CABEÇA, EXPOSIÇÃO DE UM LOBO DA CAUDAL e EXPOSIÇÃO DE PEITORAL. Entretanto, não foi possível identificar estágios de desenvolvimento específicos. Dez dos 18 eventos comportamentais apresentaram diferenças na taxa de ocorrência entre filhotes de temporadas distintas, assim como a proporção do tempo gasto em REPOUSO pelos filhotes foi diferente. Apesar destas diferenças observadas entre alguns anos, não foi identificado um padrão temporal. Na presença de um escorte o comportamento dos filhotes mudou: a taxa de ocorrência de ARQUEAMENTO DO PEDÚNCULO, EXPOSIÇÃO DE CABEÇA e COLO foi significativamente menor. Adicionalmente, os filhotes permaneceram mais tempo em NATAÇÃO e menos tempo em REPOUSO do que quando estavam acompanhados apenas de suas mães. Alguns trabalhos sugerem que a presença de um escorte pode proporcionar proteção ao filhote, porém, diante das alterações comportamentais observadas, e do aumento da velocidade média de natação, a presença do escorte parece não trazer benefícios, pelo contrário, parece ter um efeito negativo para o filhote, ao menos em termos energéticos.<br>To characterize the behavior of humpback whales calves, a study was conduct around Abrolhos Archipelago, an important nursing area for the species in Brazil. It was investigated aspects of the behavioral development of calves, behavioral differences between calves of different breeding seasons and also the effects of the presence of one escort in the behavior of calves. The data were collected from 1998 to 2004, through the months of July to November, from a land-base station on the top of Santa Barbara Island at the Abrolhos Archipelago. The chosen method was animal focal sampling, with record of all behavioral events and state occurrences, using a theodolite. A total of 207 focal observations were analyzed, comprising 313.65 hours of sampling. Humpback whales calves exhibit a very diverse behavioral repertoire, with a strong variation in the occurrence rate. More frequent events were PEDUNCLE ARCH, BREACH, EXPOSITION OF HALF OF THE FLUKE and TAIL SLAP; and the less frequent were TAIL SLASH, BELLY-UP, TAIL WAVE and PEDUNCLE ELONGATION. Among the behavioral states, calves remained more time SWIMMING (mean: 42.21%). MILLING was the second most frequent state (mean: 29.86%), followed by RESTING (mean: 20.91%) and ACTIVE was the least frequent (mean: 7.02%). The high frequency of occurrence of some behavioral events as well as the high proportion of time SWIMMING suggest that these behaviors are important to the development of coordination and motor ability and also to muscle strengthening. In this way, the calves can develop abilities needed to future social interactions and reproduction, but also to current needs, as in the development of the relationship with its mother, for nursing and for preparing to migration. There was a significant effect of phase of the season on rate of occurrence of PEDUNCLE ARCH, HEAD EXPOSITION, HEAD SLAP, EXPOSITION OF HALF OF THE FLUKE and PECTORAL EXPOSITION. However it was not possible to identify a specific development stage. Ten of 18 behavioral events showed variation in the rate of occurrence along the seven breeding seasons studied, also the proportion of time RESTING state showed a significant difference among seasons. Despite the observed differences among some years, they did not show any pattern. In the presence of one escort the behavior of calves changed. The rate of occurrence of PEDUNCLE ARCH, HEAD EXPOSITION and LAP was significant lower. Besides, calves remained more time SWIMMING and less time RESTING than when calves were only accompanied with their mothers. Studies suggest distinct functions to escorts, including provide protection to calves. However in face of the behavioral changes and increase in speed of swimming, the presence of one escort seems not to be an advantage, on the contrary seems to have a negative effect to the calf, at least in the energetic demand.
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Krieger, Sebastian. "Estudo da variabilidade na distribuição espectral das ondas de Rossby baroclínicas no Altântico e em particular na região do arquipélago de Abrolhos." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/21/21132/tde-30062009-151822/.
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Um conjunto de 15 anos de dados de anomalia da altura da superfície do mar (h) dos altímetros TOPEX/Poseidon e Jason-1 interpolado por um método de médias ponderadas pelos coeficientes de autocorrelação é utilizado para verificar as variações espectrais de ondas de Rossby do primeiro modo baroclínico no Oceano Atlântico. O método de interpolação é inovador e foi desenvolvido especificamente para esta finalidade. Médias, tendência e climatologias mensais são calculadas para todo o globo. As tendências globais mostram regiões com tendência de aumento do nível do mar que podem superar a marca de 10mmano1 e algumas regiões com tendência de rebaixamento de mesma ordem de grandeza. Uma metodologia de análise com base em ondaletas bidimensionais foi desenvolvida inteiramente no curso deste trabalho e é aplicada de forma inédita aos dados altimétricos. Através do filtro de ondaletas bidimensional, diagramas zonais temporais de h são decompostos para obter-se a variação do ciclo sazonal e o sinal propagante associado a estas ondas em determinadas latitudes. A metodologia é inicialmente aplicada no Oceano Pacífico a 28,5±N para validar os resultados com a literatura disponível e em seguida ao Oceano Atlântico e detalhada nas latitudes 32,5±N e 17,5±S. As velocidades de fase calculadas para o Atlântico variam de 20kmdia1 em latitudes de 10± e 2kmdia1 em latitudes de 38±. A variação espectral de ondas de Rossby é analisada em três localidades: 28,5±N 134,3±E, 32,5±N 73,5±W e 17,5±S 35,2±E. Em todos os casos é observada variação espectral no tempo, nas bandas anual, semestral e trimestral tanto de intensidade quanto de persistência. Além disso, através da análise da distribuição zonal-temporal da potência espectral em várias bandas, nota-se variabilidade espacial no espectro das ondas de Rossby.<br>Fifteen years of sea surface height anomaly (SSHA) from merged TOPEX/Poseidon and Jason-1 datasets gridded using an autocorrelation-based interpolation method are used to test the spectral variability of first mode baroclinic Rossby waves in the Atlantic Ocean. The gridding method is innovative and was specifically developed for this purpose. Mean SSHA, trends and monthly climatologies were determined globally. The global SSHA trends show regions of rising sea level of more than 10mmyr1 and some regions of sinking the same order of magnitude. A two-dimentional wavelet analisys-based methodology was entirely developed for the purpose of this study and is unprecedently applied to the altimetry data. SSHA longitude-time diagrams are filtered through the twodimentional wavelet filter and decomposed to obtain at certain latitudes the variation of the seasonal cycle and of the propagating signal linked to these waves. The methodology is first applied to the Pacific Ocean at 28,5±N to validate the results with the available literature and then applied to the Atlantic Ocean with detail at the latitudes 32,5±N and 17,5±S. The calculated phase velocities for the Atlantic range from 20kmday1 at 10± latitude to 2kmday1 at 38± latitude. The spectral variability of Rossby waves is analysed at three locations: 28,5±N 134,3±E, 32,5±N 73,5±W and 17,5±S 35,2±E. In all cases spectral change is observed in time, at the annual, semi-annual and quarterly spectral bands both in intensity and in persistence. Furthermore, through the longitude-time spectral power distribution analysis in various spectral bands, there is spatial variability in the Rossby wave spectrum.