Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21100fs
F. Suplicy, R. V. Souza
of structures are used in the initial/nursery phase) to commercial size and sell them mostly raw for the The Santa Catarina Island Bay (SCIB) contributes with the largest production of cultivated oysters in Brazil, which is almost entirely based on hatchery produced cultchless oyster spat, whose metamorphosis is induced by an epinephrine solution. A production scale experiment was carried out to analyze the technical feasibility of the spat-on-shell system in SCIB. The experiment was carried out for 47 weeks, involving an internal phase, the larval settlement, and an external phase, encompassing nursery and growth. Nursery periods varied according to the experimental treatments: T3W - 3 weeks; T5W - 5 weeks; and T12W - 12 weeks. T3W and T5W showed lower survival during the two-week period shortly after transfer of the cultch from the nursery to the grow-out phase, likely linked to premature exposure of the spat in the cultch strings to predators such as fish. The 12-week nursery period showed the best results with clusters with a median of 6 animals and 11.4 g of meat per oyster at the end of the experimental period. Future studies could verify whether longer nursery periods or alternative methods to avoid exposure to predators can outperform these results. Abstract
{"title":"Farming Pacific oysters using the spat-on-shell system in a shallow area in the subtropical coast of Brazil","authors":"F. Suplicy, R. V. Souza","doi":"10.1590/2675-2824070.21100fs","DOIUrl":"https://doi.org/10.1590/2675-2824070.21100fs","url":null,"abstract":"of structures are used in the initial/nursery phase) to commercial size and sell them mostly raw for the The Santa Catarina Island Bay (SCIB) contributes with the largest production of cultivated oysters in Brazil, which is almost entirely based on hatchery produced cultchless oyster spat, whose metamorphosis is induced by an epinephrine solution. A production scale experiment was carried out to analyze the technical feasibility of the spat-on-shell system in SCIB. The experiment was carried out for 47 weeks, involving an internal phase, the larval settlement, and an external phase, encompassing nursery and growth. Nursery periods varied according to the experimental treatments: T3W - 3 weeks; T5W - 5 weeks; and T12W - 12 weeks. T3W and T5W showed lower survival during the two-week period shortly after transfer of the cultch from the nursery to the grow-out phase, likely linked to premature exposure of the spat in the cultch strings to predators such as fish. The 12-week nursery period showed the best results with clusters with a median of 6 animals and 11.4 g of meat per oyster at the end of the experimental period. Future studies could verify whether longer nursery periods or alternative methods to avoid exposure to predators can outperform these results. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.22019ejdc
E. Campos, A. Gordon, Geórgenes H. Cavalcante, B. Kjerfve, M. Abouleish
{"title":"Impacts of the Red Sea and Persian Gulf on the Northern Indian Ocean in Numerical Simulations","authors":"E. Campos, A. Gordon, Geórgenes H. Cavalcante, B. Kjerfve, M. Abouleish","doi":"10.1590/2675-2824070.22019ejdc","DOIUrl":"https://doi.org/10.1590/2675-2824070.22019ejdc","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.22134agb
A. Bendia, F. Nakamura, A. Butarelli, M. Kmit, R. B. Ramos, C. N. Signori, R. A. Lourenço, M. Mahiques, P. Sumida, V. Pellizari
{"title":"First description of archaeal communities in carbonate-rich seafloor and subseafloor sediments from the Southwestern Atlantic slope","authors":"A. Bendia, F. Nakamura, A. Butarelli, M. Kmit, R. B. Ramos, C. N. Signori, R. A. Lourenço, M. Mahiques, P. Sumida, V. Pellizari","doi":"10.1590/2675-2824070.22134agb","DOIUrl":"https://doi.org/10.1590/2675-2824070.22134agb","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21102jana
José Augusto Negreiros Aragão, I. Cintra, K. Silva, D. Martins, M. Petrere Júnior
{"title":"Environmental factors associated with southern brown shrimp (Penaeus subtilis) yield at Brazilian Amazon coast","authors":"José Augusto Negreiros Aragão, I. Cintra, K. Silva, D. Martins, M. Petrere Júnior","doi":"10.1590/2675-2824070.21102jana","DOIUrl":"https://doi.org/10.1590/2675-2824070.21102jana","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21109rfds
Rosangela Felicio dos Santos, B. Kim, T. Trevizani, Rodrigo Udenal de Oliveira, Mascimiliano Maly, R. B. Ramos, R. Figueira, M. Mahiques
Although carbonate mounds have been investigated for 100 years, few studies focus on the giant variety. The Alpha Crucis Carbonate Ridge (ACCR), a ~17 x 12-km ring-shaped ridge formed by hundreds of mounded structures, located between the 300 and 800-m isobaths and reaching a maximum height of 340 meters above the adjacent seafloor, is the first giant carbonate mounded feature described for the SW Atlantic margin. This study provides the first multiproxy approach to investigate sediments covering the ACCR and its adjacencies. Most of the area is located under the Intermediate Western Boundary Current (IWBC) flow, which carries the nutrient-rich Antarctic Intermediate Water (AAIW). Radiocarbon aging shows pronounced differences for the shallow layers (MIS3 for the top of the mounds and late Holocene for the adjacencies). Grain size data indicate the prevalence of sandy fractions on top of the mounds and muddy sediments in the adjacent areas. Fe/Ca and Ti/Ca proxies allowed for identifying mainly biogenic sedimentation in the area. However, the input of allochthonous terrigenous sediment is necessary for mound buildup, and values of Fe and Ti collected on the top of the mounds are significant. End-Members distributions and metal concentrations also allowed for recognition of distinct sources of sediment. εNd and Ln(Fe/K) indicated two primary terrigenous sources, the Precambrian rocks of the Brazilian shield (Cabo Frio end-member) and the multiple lithologies drained by the Rio de la Plata basin. Redox condition proxies indicated that the area is submitted to oxic conditions, probably reflecting the action of the IWBC. This work provides the first insight into an integrated grain-size and geochemical characterization of the Alpha Crucis Carbonate Ridge (southwestern Atlantic margin).
尽管人们对碳酸盐丘的研究已经有100年的历史，但很少有研究关注这种巨大的物种。Alpha Crucis碳酸盐岩山脊(ACCR)是一个由数百个丘状结构组成的约17 × 12公里的环形山脊，位于300至800米的等深线之间，最大高度高于邻近海底340米，是西南大西洋边缘描述的第一个巨大的碳酸盐岩丘状特征。该研究提供了第一个多代理方法来研究覆盖ACCR及其邻近地区的沉积物。大部分地区位于中间西边界流(IWBC)流之下，该流携带着营养丰富的南极中间水(AAIW)。放射性碳年代学在浅层表现出明显的差异(MIS3为丘顶，而在邻近地区则为全新世晚期)。粒度数据表明，土丘顶部普遍存在砂质组分，邻近地区普遍存在泥质沉积物。Fe/Ca和Ti/Ca指标主要用于识别该区的生物沉积。然而，外来陆源沉积物的输入对土丘的形成是必要的，并且在土丘顶部收集的Fe和Ti值显著。端元分布和金属浓度也允许识别沉积物的不同来源。εNd和Ln(Fe/K)表明了两个主要的陆源来源，即巴西盾(Cabo Frio端元)的前寒武纪岩石和里约热内卢de la Plata盆地的多种岩性。氧化还原条件指标表明该地区处于氧化条件下，可能反映了IWBC的作用。这项工作首次提供了对阿尔法克鲁斯碳酸盐岩脊(西南大西洋边缘)的综合粒度和地球化学特征的见解。
{"title":"Sedimentation in the adjacencies of a southwestern Atlantic giant carbonate ridge","authors":"Rosangela Felicio dos Santos, B. Kim, T. Trevizani, Rodrigo Udenal de Oliveira, Mascimiliano Maly, R. B. Ramos, R. Figueira, M. Mahiques","doi":"10.1590/2675-2824070.21109rfds","DOIUrl":"https://doi.org/10.1590/2675-2824070.21109rfds","url":null,"abstract":"Although carbonate mounds have been investigated for 100 years, few studies focus on the giant variety. The Alpha Crucis Carbonate Ridge (ACCR), a ~17 x 12-km ring-shaped ridge formed by hundreds of mounded structures, located between the 300 and 800-m isobaths and reaching a maximum height of 340 meters above the adjacent seafloor, is the first giant carbonate mounded feature described for the SW Atlantic margin. This study provides the first multiproxy approach to investigate sediments covering the ACCR and its adjacencies. Most of the area is located under the Intermediate Western Boundary Current (IWBC) flow, which carries the nutrient-rich Antarctic Intermediate Water (AAIW). Radiocarbon aging shows pronounced differences for the shallow layers (MIS3 for the top of the mounds and late Holocene for the adjacencies). Grain size data indicate the prevalence of sandy fractions on top of the mounds and muddy sediments in the adjacent areas. Fe/Ca and Ti/Ca proxies allowed for identifying mainly biogenic sedimentation in the area. However, the input of allochthonous terrigenous sediment is necessary for mound buildup, and values of Fe and Ti collected on the top of the mounds are significant. End-Members distributions and metal concentrations also allowed for recognition of distinct sources of sediment. εNd and Ln(Fe/K) indicated two primary terrigenous sources, the Precambrian rocks of the Brazilian shield (Cabo Frio end-member) and the multiple lithologies drained by the Rio de la Plata basin. Redox condition proxies indicated that the area is submitted to oxic conditions, probably reflecting the action of the IWBC. This work provides the first insight into an integrated grain-size and geochemical characterization of the Alpha Crucis Carbonate Ridge (southwestern Atlantic margin).","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"27 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.22022ral
R. A. Lourenço, N. Kunrath, Doris Nagaoka, C. A. Magalhães, Antonio Derley S. Pereira, Basílio Magno Tavares Sotão Neto, C. T. Timoszczuk, F. R. Santos, Guilherme A. Pedrão, L. Araujo, Lorena Sampaio Nascimento, Nayara Ferreira Carvalho, J. Silva, S. Taniguchi, M. Mahiques, M. Bícego, P. Sumida
{"title":"Characterization of the organic matter in pockmark areas of the Southwestern Atlantic upper slope","authors":"R. A. Lourenço, N. Kunrath, Doris Nagaoka, C. A. Magalhães, Antonio Derley S. Pereira, Basílio Magno Tavares Sotão Neto, C. T. Timoszczuk, F. R. Santos, Guilherme A. Pedrão, L. Araujo, Lorena Sampaio Nascimento, Nayara Ferreira Carvalho, J. Silva, S. Taniguchi, M. Mahiques, M. Bícego, P. Sumida","doi":"10.1590/2675-2824070.22022ral","DOIUrl":"https://doi.org/10.1590/2675-2824070.22022ral","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.22038ek
E. Kocum
{"title":"Scanning electron microscope analysis of Emiliania huxleyi samples revealed the presence of a single morphotype in the Dardanelles Strait, Turkey","authors":"E. Kocum","doi":"10.1590/2675-2824070.22038ek","DOIUrl":"https://doi.org/10.1590/2675-2824070.22038ek","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21032evda
E. V. Almeida, V. T. Kütter, E. Silva-Filho
The mangrove crab Ucides cordatus (Linnaeus, 1763) is a burrowing crab with an important role in mangrove nutrient cycling. The species holds major socioeconomic importance, generating yield for traditional and low-income populations. Despite its ecological and economic importance, there are few experiments in Brazil applying stable isotope tools to trophic crab classification, and even fewer considering females in the reproductive period. Females have different energy demands than males; studies examining C and N can reveal details regarding the differences. Hence, the present study is the first analysis of the δ 13 C, δ 15 N, and the C/N ratio in ovigerous females of two populations from Southeastern Brazil (Caceribu River - Guanabara Bay and Gargaú mangrove - Paraiba do Sul River secondary estuary). The Caceribu mangrove is larger and is located in one of the most impacted bays in the world. In the Paraiba do Sul River region, the mangrove swamp is about ten times smaller, has a substantially lower population in the surrounding area, and is more influenced by agricultural activities. The δ 13 C analysis confirmed mangrove leaves as their main food source. The significant δ 13 C variation between the Guanabara and Paraiba do Sul estuary populations can be related to differences in food availability and nutritional value. However, the δ 15 N values can be related to the ingestion of other food items during the breeding season as well as the influence of anthropogenic mangrove degradation. At both study sites, the δ15N values were higher than those observed in other mangrove crab populations and other herbivorous species. Significant ( p < 0.05) isotopic differences were found among populations, suggesting variations in biogeochemical cycles that may be related to different environmental conditions between the sites. Abstract
红树林蟹Ucides cordatus (Linnaeus, 1763)是一种穴居蟹，在红树林养分循环中起着重要作用。该物种具有重要的社会经济意义，为传统和低收入人群创造产量。尽管其具有重要的生态和经济意义，但巴西很少有将稳定同位素工具用于营养蟹分类的实验，更少考虑生殖期的雌性。女性的能量需求与男性不同;研究C和N可以揭示有关差异的细节。因此，本研究首次分析了巴西东南部两个种群(Caceribu河- Guanabara湾和Gargaú红树林- Paraiba do Sul河次级河口)的雌卵δ 13c、δ 15n和C/N比值。卡塞里布红树林面积更大，位于世界上受影响最严重的海湾之一。在南Paraiba do Sul河地区，红树林沼泽面积约为原来的十分之一，周边地区的人口也少得多，而且受农业活动的影响更大。δ 13c分析证实红树林树叶是它们的主要食物来源。瓜纳巴拉和南帕拉伊巴河口种群之间δ 13c的显著差异可能与食物可得性和营养价值的差异有关。然而，δ 15 N值可能与繁殖季节其他食物的摄食以及人为红树林退化的影响有关。两个研究点的δ15N值均高于其他红树林蟹群和其他草食性物种。种群间同位素差异显著(p < 0.05)，表明生物地球化学循环的差异可能与不同环境条件有关。摘要
{"title":"Trophic analysis of female mangrove crabs at two sites from Southeastern Brazil (Rio de Janeiro)","authors":"E. V. Almeida, V. T. Kütter, E. Silva-Filho","doi":"10.1590/2675-2824070.21032evda","DOIUrl":"https://doi.org/10.1590/2675-2824070.21032evda","url":null,"abstract":"The mangrove crab Ucides cordatus (Linnaeus, 1763) is a burrowing crab with an important role in mangrove nutrient cycling. The species holds major socioeconomic importance, generating yield for traditional and low-income populations. Despite its ecological and economic importance, there are few experiments in Brazil applying stable isotope tools to trophic crab classification, and even fewer considering females in the reproductive period. Females have different energy demands than males; studies examining C and N can reveal details regarding the differences. Hence, the present study is the first analysis of the δ 13 C, δ 15 N, and the C/N ratio in ovigerous females of two populations from Southeastern Brazil (Caceribu River - Guanabara Bay and Gargaú mangrove - Paraiba do Sul River secondary estuary). The Caceribu mangrove is larger and is located in one of the most impacted bays in the world. In the Paraiba do Sul River region, the mangrove swamp is about ten times smaller, has a substantially lower population in the surrounding area, and is more influenced by agricultural activities. The δ 13 C analysis confirmed mangrove leaves as their main food source. The significant δ 13 C variation between the Guanabara and Paraiba do Sul estuary populations can be related to differences in food availability and nutritional value. However, the δ 15 N values can be related to the ingestion of other food items during the breeding season as well as the influence of anthropogenic mangrove degradation. At both study sites, the δ15N values were higher than those observed in other mangrove crab populations and other herbivorous species. Significant ( p < 0.05) isotopic differences were found among populations, suggesting variations in biogeochemical cycles that may be related to different environmental conditions between the sites. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67342299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21067lyr
L. Roselli, Edison Barbieri
Estuaries are important environments for birds as resting and foraging sites. Therefore, information about the abundance, distribution, and biology of bird populations are necessary for preservation of such ecosystems. In this work, we studied the dynamic population of birds at Baixio do Arrozal, Trapandé Bay, Cananéia Estuary on the southern coast of São Paulo state, Brazil. As an original hypothesis, we expected that the species abundances would display differences across months and seasons. Using the point count method, bird data were collected monthly between April and December 2013. For comparing the assemblages, a bar chart of the total abundance as a function of the monthly frequency was used along with boxplot graph of this index as a function of the seasons. We also investigated variations in the abundance of some specific bird populations. The results obtained for the total abundance indicated a seasonal pattern, peaking during the warmer months. The population analyses showed a greater abundance occurring in spring/summer, and a decrease of resident species populations in the winter. Migratory birds were recorded in the autumn and spring, following the migratory movements. This demonstrated that bird assemblages varied according to seasons due to the life cycle and the population sizes. Therefore, Baixio do Arrozal is an important environment for avifauna, which use the area throughout the year and need to be preserved.
河口是鸟类栖息和觅食的重要环境。因此，关于鸟类种群的丰度、分布和生物学的信息对于保护这些生态系统是必要的。在这项工作中，我们研究了巴西圣保罗州南部海岸canan河口的trapand湾Baixio do Arrozal的鸟类动态种群。作为最初的假设，我们预计物种丰度会在月份和季节之间表现出差异。采用点计数法，于2013年4月至12月间每月采集鸟类数据。为了比较组合，使用了总丰度作为月频率函数的条形图和该指数作为季节函数的箱线图。我们还调查了一些特定鸟类种群的丰度变化。总丰度的结果显示了一个季节性的模式，在温暖的月份达到峰值。种群分析结果显示，春夏两季常住种种群数量较多，冬季常住种种群数量减少。在秋季和春季记录候鸟，随着迁徙运动。这表明，由于生命周期和种群规模的不同，鸟类的组合随季节而变化。因此，对鸟类来说，白晓是一个重要的环境，鸟类全年都在使用该地区，需要保护。
{"title":"Seasonal variation of estuarine birds from Trapandé Bay, Cananéia, Brazil","authors":"L. Roselli, Edison Barbieri","doi":"10.1590/2675-2824070.21067lyr","DOIUrl":"https://doi.org/10.1590/2675-2824070.21067lyr","url":null,"abstract":"Estuaries are important environments for birds as resting and foraging sites. Therefore, information about the abundance, distribution, and biology of bird populations are necessary for preservation of such ecosystems. In this work, we studied the dynamic population of birds at Baixio do Arrozal, Trapandé Bay, Cananéia Estuary on the southern coast of São Paulo state, Brazil. As an original hypothesis, we expected that the species abundances would display differences across months and seasons. Using the point count method, bird data were collected monthly between April and December 2013. For comparing the assemblages, a bar chart of the total abundance as a function of the monthly frequency was used along with boxplot graph of this index as a function of the seasons. We also investigated variations in the abundance of some specific bird populations. The results obtained for the total abundance indicated a seasonal pattern, peaking during the warmer months. The population analyses showed a greater abundance occurring in spring/summer, and a decrease of resident species populations in the winter. Migratory birds were recorded in the autumn and spring, following the migratory movements. This demonstrated that bird assemblages varied according to seasons due to the life cycle and the population sizes. Therefore, Baixio do Arrozal is an important environment for avifauna, which use the area throughout the year and need to be preserved.","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"9 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67342608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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