Consulta: subjectFacets:"Settlement"
Registros recuperados: 21
Data/hora: 02/06/2024 11:35:53

Combined effects of temperature-salinity on larval survival of the Eastern oyster Crassostrea virginica in the Maryland portion of the Chesapeak Bay (USA)
Provedor de dados: 5
Autores: Goulletquer, Philippe; Heral, Maurice; Prou, Jean.
Oyster landings in the Maryland portion of the Chesapeake Bay have declined by more than 50fold since the early part of the century, despite intensive management efforts. The annual shell repletion program is the most critical programmatic element to effect recovery of the ailing Eastern oyster Crassotrea virginica stock and fishery. The overall efficacy of shell repletion management depends primarily on the success of spat settlement on the planted shell, and furthermore on their survival rate. The Operations Research techniques and mathematical programming developed by Rothschild et al. (1991) attempt to maximize spat recruitment to the oyster stock subject to a series of operational constraints. Allocation and timing of shell deployment are the most...
Tipo: Text
Palavras-chave: Larval; Settlement; USA; Chesapeake Bay; Crassotrea virginica; Oysters.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-3074.pdf

Addressing critical limitations of oyster (   Ostrea edulis   ) restoration: Identification of nature‐based substrates for hatchery production and recruitment in the field
Provedor de dados: 5
Autores: Colsoul, Bérenger; Pouvreau, Stephane; Di Poi, Carole; Pouil, Simon; Merk, Verena; Peter, Corina; Boersma, Maarten; Pogoda, Bernadette.
The European flat oyster (Ostrea edulis) is an ecosystem engineer that provides important biogenic reef habitat with associated ecosystem functions and services. Most stocks have been commercially exploited and degraded; some are functionally extinct. Ecological restoration now aims to recover these degraded, damaged or destroyed ecosystems. Availability of seed oysters and substrate for successful larval recruitment has been identified as a major limiting factor for restoration projects in Europe. In substrate‐limited areas, restoration approaches have to involve the restoration of suitable substrates. The present study provides an evaluation of such potential substrate types. Various categories were investigated through hatchery and/or field experiments:...
Tipo: Text
Palavras-chave: Coastal; Invertebrates; Restoration; Settlement; Substrates.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/77058/78357.pdf

Relationship between pre- and post-metamorphic growth in the Pacific oyster Crassostrea gigas (Thunberg)
Provedor de dados: 5
Autores: Collet, Bertrand; Boudry, Pierre; Thebault, Anne; Heurtebise, Serge; Morand, Berenice; Gerard, Andre.
Twenty male and 20 female parental oysters, originating from four sites located along the French Atlantic coast, were crossed together. The 400 crosses were performed separately and then pooled to give a batch of larvae with a large genetic base. Successive sieving after 17 days at 23°C enabled the separation of the largest larvae from the batch. These larvae (i.e., sieving groups) were left to metamorphose and fix onto flat PVC collectors changed daily. Four groups of larvae representing distinctly different growth rates were successively separated during the attachment and metamorphosis of the whole population. This lasted 12 days, from the 17th day to the 29th after fertilisation. A part of each sieving group was settled separately as replicates on...
Tipo: Text
Palavras-chave: Settlement; Metamorphosis; Crassostrea gigas; Growth.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/publication-468.pdf

Screening of marine algal extracts for anti-settlement activities against microalgae and macroalgae
Provedor de dados: 5
Autores: Hellio, Claire; Berge, Jean-pascal; Beaupoil, Claude; Le Gal, Yves; Bourgougnon, Nathalie.
The ban on the use of TBT-based antifouling paints for boats under 25 m in length has lead to a search for new non-toxic antifoulants. One of the most promising alternative technologies to heavy metal based antifouling paint is the development of antifouling coatings whose active ingredients are naturally occurring compounds from marine organisms. This is based on the principle that marine organisms are also facing the problem of the presence of epibionts on their own surface. In this study, the antifouling activity of a series of aqueous, ethanolic and dichloromethane extracts from 30 algae from the North East Atlantic coast was investigated. The extracts were tested in laboratory assays against species representatives of two major groups of fouling...
Tipo: Text
Palavras-chave: Antifouling; Antialgal; Microalgae; Macroalgae; Screening; Settlement; Spores.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00057/16795/14304.pdf

Duality of trophic supply and hydrodynamic connectivity drives spatial patterns of Pacific oyster recruitment
Provedor de dados: 5
Autores: Lagarde, Franck; Fiandrino, Annie; Ubertini, Martin; Roque D'Orbcastel, Emmanuelle; Mortreux, Serge; Chiantella, Claude; Bec, Beatrice; Bonnet, Delphine; Roques, Cécile; Bernard, Ismael; Richard, Marion; Guyondet, Thomas; Pouvreau, Stephane; Lett, Christophe.
The recent discovery of Pacific oyster Crassostrea gigas (also known as Magallana gigas) spatfields in a Mediterranean lagoon intensely exploited for shellfish farming (Thau lagoon) revealed significant contrasts in spatial patterns of recruitment. We evaluated the processes that drive spatial patterns in oyster recruitment by comparing observed recruitment, simulated hydrodynamic connectivity and ecological variables. We hypothesized that spatial variability of recruitment depends on (1) hydrodynamic connectivity and (2) the ecology of the larval supply, settlement, metamorphosis, survival and biotic environmental parameters. We assessed recruitment at 6-8 experimental sites by larval sampling and spat collection inside and outside oyster farming areas...
Tipo: Text
Palavras-chave: Crassostrea gigas; Coastal lagoon; Larval ecology; Spatial patterns; Connectivity; Settlement; Recruitment; Oligotrophication.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00598/70981/69271.pdf

Lethal and sub-lethal effects of Deepwater Horizon slick oil and dispersant on oyster (Crassostrea virginica) larvae
Provedor de dados: 5
Autores: Vignier, J.; Soudant, P.; Chu, F. L. E.; Morris, J. M.; Carney, M. W.; Lay, C. R.; Krasnec, M. O.; Robert, Rene; Volety, A. K.
In April 2010, crude oil was spilled from the Deepwater Horizon (DWH) oil platform for 87 days, coincident with the spawning season and recruitment of the oyster, Crassostrea virginica, in the Gulf of Mexico. Impacts of acute exposures to surface-collected DWH oil (HEWAF), dispersed oil (CEWAF) and dispersant alone (Corexit 9500A®) on planktonic larval stages of C. virginica (veliger, umbo and pediveliger) were tested in the laboratory. Exposures to HEWAF, CEWAF and dispersant were toxic to larvae impairing growth, settlement success and ultimately survival. Larval growth and settlement were reduced at concentrations of tPAH50 ranging from 1.7 to 106 μg L−1 for HEWAF and 1.1–35 μg L−1 for CEWAF, concentrations well within the range of water sampled during...
Tipo: Text
Palavras-chave: Deepwater Horizon oil spill; Crassostrea virginica; Corexit 9500A (R); Larvae; Growth; Settlement; PAH.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00345/45572/45181.pdf

Rising water temperatures, reproduction and recruitment of an invasive oyster, Crassostrea gigas, on the French Atlantic coast
Provedor de dados: 5
Autores: Dutertre, Mickael; Beninger, Peter G.; Barille, Laurent; Papin, Mathias; Haure, Joel.
The recent appearance and invasion of feral oysters (Crassostrea gigas) along the northern European Atlantic coast, underscores the necessity to investigate the relationship between environmental variables, reproductive physiology, larval development and recruitment. We studied these relationships at both high (HT) and intermediate (IT) - turbidity sites, through historical data on water temperatures, multi-parameter environmental probes, histological analyses, and field collections of planktonic larvae and settled post-larvae in 2005 and 2006. A progressive warming trend was observed, especially since 1995, when oyster proliferation first became severe. Threshold temperatures for oocyte growth, larval development and settlement were achieved in both 2005...
Tipo: Text
Palavras-chave: Aquaculture; Climate warming; Coastal waters; Crassostrea gigas; Reproductive cycle; Oyster larvae; Settlement; Turbidity.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00000/11150/7938.pdf

エチオピア中高地における定住化牧畜民の移動性と旱魃への対処戦略 : 北東部Afar 州と南部Oromia 州の事例
Provedor de dados: 19
Autores: 平田, 昌弘; 鬼木, 俊次; HIRATA, Masahiro; ONIKI, Shunji.
本稿は、異常気象や社会変化に対する牧畜民・半農半牧民の対応戦略を検討するための予備的調査として、1）牧畜民の定住化前・後の放牧形態を把握し、2）定住化の度合いが牧畜民や半農半牧民の旱魃への対処戦略にどのように影響しているかについて分析し、3）旱魃はどのような人々に最も影響を及ぼすかを特定することを目的とした。 調査は、エチオピア北東部のAfar州第2地区Abala郡と、南部のOromia州Borena地区Yabelo郡・Dire郡の2カ所の中高地域において、2012年2月14日〜3月1日にかけて合計9 つの村で観察とインタビューとをおこなった。 Afar牧畜民もBorena牧畜民も、定住する前は、家族全員が全家畜を伴って季節移動していた。乾期には小川など...
Palavras-chave: 旱魃; 牧畜; 定住化; 農耕開始; 公共施設建設; Drought; Pastoralism; Settlement; Start of cultivation; Construction of public facility.
Ano: 2012
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3536

AÇÃO EXTENSIONISTA DA EMPAER FRENTE À NOVA PNATER: UMA ANÁLISE A PARTIR DO ASSENTAMENTO GUAPIRAMA, CAMPO NOVO DO PARECIS - MT
Provedor de dados: 31
Autores: Laforga,   Gilmar; Vieira,   Andreia De Oliveira.
O modelo de agricultura ainda praticado continua a causar impactos negativos como a perda de solo, erosão genética, contaminação do solo e da água entre muitos outros efeitos. Considerando-se esse cenário e assim buscar minimizar estes processos, foi criada a Política Nacional de Assistência Técnica e Extensão Rural – PNATER, que orienta uma extensão rural baseada nos princípios epistemológico da agroecologia. Entre as mudanças, está à exigência de um novo perfil de extensionista, uso de metodologias participativas, minimização de utilização de recursos externos à propriedade, e a produção de vegetais e animais com a mínima degradação dos recursos naturais. O presente trabalho tem por objetivo analisar se essas mudanças estão sendo efetivamente empregadas...
Tipo: Conference Paper or Presentation
Palavras-chave: Agroecologia; Reforma Agrária; EMPAER; PNATER; Metodologias Participativas; Agroecology; Settlement; EMPAER; PNATER; Participatory methodology; Resource /Energy Economics and Policy; Teaching/Communication/Extension/Profession.
Ano: 2008
URL: http://purl.umn.edu/108965

CAPITAL SOCIAL COMO FATOR DE DESENVOLVIMENTO LOCAL
Provedor de dados: 31
Autores: Mendonca,   Kamila Vieira; Pinheiro,   Jose Cesar.
O presente estudo verificou e avaliou o grau de acumulação de capital social como fator de desenvolvimento local, do assentamento Che Guevara, localizado no município de Ocara, no Estado do Ceará. O índice de capital social (ICS) foi calculado com base nas respostas de um questionário elaborado com variáveis mensuráveis e que refletem o estoque de capital social. A comunidade dispõe de um grau mediano de capital social.-------------This study verified and evaluated the degree of accumulation of capital as a factor of local development, of the settlement Che Guevara, located in the municipality of Ocara, in the state of Ceará. The index of social capital (ICS) has been based on responses from a questionnaire was prepared with variables they consider aspects...
Tipo: Conference Paper or Presentation
Palavras-chave: Capital Social; Desenvolvimento Local; Assentamento; Social Capital; Local Development; Settlement; Community/Rural/Urban Development; Financial Economics.
Ano: 2008
URL: http://purl.umn.edu/108083

Land settlement planning issues in irrigation management:  A review of experiences in Sri Lanka
Provedor de dados: 31
Autores: Stanbury,   Pamela.
This document is meant to present a framework for analyzing the institutions related to water management in a river basin context. The design of the five-country regional study undertaken by IWMI on “Development of Effective Water Management Institutions” provided a new methodology and a framework for river basin studies. It consists of four key components of diagnostic investigations related to water resources management in a river basin, which are interrelated. These key components are the physical system, water accounting, socioeconomic situation and performance. This study design is given in the Study’s Inception Report of 15 June 1999, and the Methodological Guidelines of 1 October 1999. This document takes one step further, and provides a conceptual...
Tipo: Working or Discussion Paper
Palavras-chave: Irrigation management; Settlement; Planning; Land management; Sri Lanka; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; Land Economics/Use; Political Economy; Public Economics; Resource /Energy Economics and Policy.
Ano: 1988
URL: http://purl.umn.edu/53072

Social aspects of water management during the Maha season 1985/86 in Dewahuwa and Mahaweli H-2 Block 305: precept and practice
Provedor de dados: 31
Autores: Bulankulame,   Senarath.
The International Irrigation Management Institute (IIMI) began research projects in Dewahuwa Tank and Mahaweli 11-2 during the Yala season (May-Aug.) of 1985. The research focussed initially on agricultural economics (e.g., farmers' use of agricultural inputs and returns from different crops) and on irrigation engineering (water distribution and flow rates). In the second season (Maha 1985/86) of research a social science component was added to address issues of farmers' management decisions and the institutional arrangements by which farmers and agency officials operate and maintain the irrigation works. This report summarizes the research results of the social science component for the Maha season, from October 1985 to April 1986.
Tipo: Working or Discussion Paper
Palavras-chave: Water management; Farmer-agency interactions; Cropping systems; Water distribution; Irrigation programs; Settlement; Crop Production/Industries; Institutional and Behavioral Economics.
Ano: 1986
URL: http://purl.umn.edu/113861

Land settlement planning issues in irrigation management:  A review of experiences in Sri Lanka.
Provedor de dados: 31
Autores: Stanbury,   Pamela.
This document is meant to present a framework for analyzing the institutions related to water management in a river basin context. The design of the five-country regional study undertaken by IWMI on “Development of Effective Water Management Institutions” provided a new methodology and a framework for river basin studies. It consists of four key components of diagnostic investigations related to water resources management in a river basin, which are interrelated. These key components are the physical system, water accounting, socioeconomic situation and performance. This study design is given in the Study’s Inception Report of 15 June 1999, and the Methodological Guidelines of 1 October 1999. This document takes one step further, and provides a conceptual...
Tipo: Working or Discussion Paper
Palavras-chave: Irrigation management; Settlement; Planning; Land management; Sri Lanka; Agricultural and Food Policy; Crop Production/Industries; Farm Management; Land Economics/Use.
Ano: 1988
URL: http://purl.umn.edu/52783

Collective Retaliation and the WTO Dispute Settlement System
Provedor de dados: 31
Autores: Korotana,   M.S.
Article 22 of the Dispute Settlement Understanding (DSU) of the WTO offers, as last resort countermeasures, withdrawal of the concessions the state parties had agreed to in their schedules of commitments. The problem is that such a withdrawal of concessions would have very little impact on the economy and consequently on the behaviour of the respondent state if that party happened to be a developed state vis-à-vis a small, developing country. To deal with this situation a remedy of “collective countermeasures”, contained in Article 54 of the Draft Articles on State Responsibility of the International Law Commission (ILC), has been proposed; it has been argued that this remedy should apply, as a general principle of public international law, as a last...
Tipo: Journal Article
Palavras-chave: Collective; Retaliation; WTO; Dispute; Settlement; System; Food Consumption/Nutrition/Food Safety; International Relations/Trade.
Ano: 2009
URL: http://purl.umn.edu/48802

PRODUÇÃO E COMERCIALIZAÇÃO DO LEITE NO ASSENTAMENTO TIMBORÉ (SP): O CASO DA COOPERATIVA AGROPECUÁRIA TIMBORÉ ANDRADINA E CASTILHO1
Provedor de dados: 31
Autores: Vignotto,   Francine Meca; Tarsitano,   Maria Aparecida Anselmo.
Pretende-se levantar e analisar o papel da Cooperativa na produção e comercialização do leite e da assistência técnica no assentamento Timboré, localizado na região oeste do estado de São Paulo. A metodologia proposta é composta pela aplicação de um questionário junto aos técnicos do ITESP responsáveis por este assentamento e também ao responsável pela Cooperativa Agropecuária Timboré Andradina e Castilho (COATAC), visando levantar o seu papel junto aos cooperados na produção e comercialização do leite. Concluindo que os técnicos do ITESP vêm desenvolvendo um bom trabalho junto aos produtores de leite do assentamento. Porém, as atividades da cooperativa junto aos cooperados resumem-se às compras conjuntas de insumos a preços mais baixos que os de mercado....
Tipo: Conference Paper or Presentation
Palavras-chave: Assentamento; Cooperativa; Agricultura familiar; Settlement; Cooperative; Family agriculture; Agribusiness; Livestock Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/107934

First field record of mangrove crab Ucides cordatus (Crustacea: Decapoda: Ucididae) recruits co-inhabiting burrows of conspecific crabs
Provedor de dados: 103
Autores: Schmidt,Anders Jensen; Diele,Karen.
Recruits of the mangrove crab Ucides cordatus (Linnaeus, 1763), rarely encountered in the field were found co-inhabiting burrows of larger male and female conspecifics in the mangrove forest. They were located in the sediment of the inner walls and burrow plugs. Average carapace width (CW) of the hosting and co-inhabiting crabs was 3.8 ± 0.20 and 0.9 ± 0.03, respectively. As shown by the size-frequency distribution, while most recruits leave the conspecific burrows after reaching 1.0 cm CW, some stay until they reach a size of 2.5 cm CW. The results of this study contribute to a better understanding of recruitment patterns in this ecologically and economically important mangrove crab species. Follow-up studies are however needed to fully determine the role...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Caranguejo-uçá; Juvenile; Recruitment; Settlement; Size-frequency.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400026

Crypsis in early benthic phases of Brachyuran Decapod Crustaceans in central Chile
Provedor de dados: 97
Autores: PALMA,ÁLVARO T.; ORREGO,CAEL; ARRIAGADA,MAURICIO.
Although common and in some cases of commercial value, little is known about the mechanisms and processes that affect the distribution and abundance of many species of decapod crustaceans, particularly in Chile. All of these species have planktonic larvae that must settle and recruit before becoming part of the adult segments of their populations. For several of these species we have detected the presence of a variety of color morphs in newly settled individuals. The existence of these morphs in Chilean species is comparable with those observed in other latitudes (e.g., coast of the Gulf of Maine). On the other hand, it is characteristic that the occurrence of these patterns only appears during the early juvenile stages and that after reaching a certain...
Tipo: Journal article
Palavras-chave: Crypsis; Behavior; Brachyuran Decapods; Settlement; Recruitment; Central Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200002

Influence of natural settlement cues on the metamorphosis of fiddler crab megalopae, Uca vocator (Decapoda: Ocypodidae)
Provedor de dados: 42
Autores: Simith,Darlan J.B.; Diele,Karen; Abrunhosa,Fernando A.
Megalopae of many decapod crab species accelerate their development time to metamorphosis (TTM) when exposed to natural physical and/or chemical cues characteristic of the parental habitat. In the present study, the influence of natural settlement cues on the moulting rates and development TTM in megalopae of the fiddler crab Uca vocator was investigated. The effects of mud from different habitats (including well-preserved and degraded-polluted mangrove habitats) and conspecific adult 'odours' (seawater conditioned with crabs) on the induction of metamorphosis were compared with filtered pure seawater (control). 95 to 100% of the megalopae successfully metamorphosed to first juvenile crab stage in all treatments, including the control. However, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conspecific 'odours'; Fiddler crab; Megalopa; Metamorphosis; Settlement; Uca vocator.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200007

Effect of microhabitat distribution and substrate roughness on barnacle Tetraclita stalactifera (Lamarck, 1818) settlement
Provedor de dados: 52
Autores: Skinner,Luís Felipe; Coutinho,Ricardo.
Studies were carried out on microhabitat distribution and substrate roughness on barnacle settlement at Cabo Frio region, Rio de Janeiro, Brazil. Ten commercial blocks of granite rock (100 cm²) were attached to rocky coast at 0.6 tide level (5 smooth blocks and 5 rough with 20 holes). Experiment was conduced for five weeks, with repetitions each week. Settlement was higher on rough (398 individuals) than on smooth blocks (38 individuals) on the same week. There was no significant difference between settlement in the centre of the block and at the edge. Significant differences observed among weeks were affected by the variability of cyprid larvae density. This result showed that roughness was an important variable to be considered on barnacle settlement.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barnacle; Substrate roughness; Settlement; Upwelling.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000100014

The influence of techniques of larvae rearing and seed collectors on the survival rate and recovery efficiency of the brown mussel Perna perna (L.) in laboratory
Provedor de dados: 52
Autores: Beduschi,Pedro; Melo,Cláudio Manoel Rodrigues de; Ferreira,Jaime Fernando.
Te study compared the hatchery recovery efficiency and survival rate of Perna perna spats using larvae submitted to four conditions, prior to settlement, tested with for different collectors. In 15 days old larvae (eyed larvae, T1), transparent nylon thread collectors presented the best results for spats recovered per meter of collector. The 28 days old larvae (foot larvae) stored under refrigeration before settlement (T3 with water and T4 without water) showed no significant differences between the spat number in all the collectors. The brown multi-thread collector was more efficient in T 4. The blue polyamide thread collector was the most efficient with 28 days old larvae settled directly, without refrigeration (T2). Treatment 1 showed the highest spats...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spats; Settlement; Perna perna; Collectors; Hatchery.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100019

Duration of the pre-settlement period of the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) under laboratory conditions
Provedor de dados: 52
Autores: Ventura,Robson; Silva,Ubiratã de Assis Teixeira da; Perbiche-Neves,Gilmar; Ostrensky,Antonio; Boeger,Walter Antonio Pereira; Pie,Marcio Roberto.
The goal of the present study was to determine the most appropriate time to release the immatures of Ucides cordatus (Linnaeus) produced in the laboratory into the natural environments. Specifically, the time when the megalopae sought the mangrove sediment to excavate the burrows was determined, as well as the time necessary for their metamorphosis into the first juvenile stage. Results indicated that the megalopae of U. cordatus reared in the laboratory took three to ten days (median = 6) after their molt to excavated burrows in the sediment. The average time for the megalopae to molt into juveniles was 12.6 days (SD = 2.3).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ucides cordatus; Restocking; Larval rearing; Settlement; Megalopae; Juvenile.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500012