A marked effect of water snails on small crustaceans. [Translation from: Anz.Ost.Akad.Wiss 10, 95-99, 1952. ]

Cases of mutual exclusion of two species of organisms in nature are known in large numbers. In the majority, they make different demands on the environ- ment which makes co-occurrence impossible. Less frequent are those cases in which a definite activity of one species prevents the occurrence of the other in the same region. An experiment was carried out n order to establish if Chydorus sphaericus can co-occur with water-snails. It emerged that a substance soluble in water which is given off by snails is responsible for the negative effect on small crustacea.

Relationship of dimensions and weight in freshwater planktonic crustaceans. [Translation from: Doklady Akademii Nauk SSSR 84(1) 153-156, 1952. ]

There is no doubt that determination of the biomass of zooplankton (primarily of crustaceans) will be taken into consideration in practice and limnological works, especially after the recent publication of fairly comprehensive tables of weights of a whole range of species of freshwater copepods and cladocerans. The usefulness of applying formulae of determining the biomass of marine crustaceans for freshwater copepods is discussed.

Mariátegui e a modernidade das rebeliões indígenas na América Latina: Bolívia (1930-1952)

Esta tese aborda os movimentos indígenas bolivianos que ocorreram no período de1930 à Revolução de 1952. A pesquisa analisa as questões étnicas e os significativos preconceitos e marginalização sociais, aos indígenas, que se desenvolveram na Bolívia. Debatemos esta temática através dos conceitos de Tradição e Modernidade e indicando, ainda, a permanência das características indígenas na formação social atual. O tema se insere na Linha de Pesquisa de Política e Cultura que aborda questões conceituais envolvendo, inclusive, aspectos do poder simbólico, além de expressar uma intersecção entre política e cultura. Nesta investigação abordam-se, também, o pensamento dos intelectuais e da cultura Latinoamericana, destacando-se as obras de José Carlos Mariátegui. As concepções desse autor são interpretadas através dos lineamentos conceituais, inerentes à cultura política em sua perspectiva ideológica. A problemática desenvolvida consistiu em examinar, considerando as percepções de Mariátegui, os movimentos indígenas na Bolívia de 1930 a 1952, notadamente o I Congresso Indígena Boliviano. As hipóteses construídas corroboraram com a problemática apresentada. A tese objetivou também contribuir para os estudos historiográficos Latinoamericanos sobre as rebeliões indígenas na América.

Naceu lá na serra uma linda flor: a fundação do Império Serrano (1947-1952)

As escolas de samba no Rio de Janeiro se constituíram como espaços privilegiados para atuação política dos moradores das comunidades e assim extrapolaram sua função primeira de promover o lazer para o carnaval em direção à visibilidade das comunidades a elas ligadas. Neste contexto, enfocam-se o Morro da Serrinha e a fundação da Escola de Samba Império Serrano, em uma ação que remonta as redes de relações sociais baseadas em laços familiares. a memória da história da escola vincula-se à memória das famílias locais, elementos centrais de produção e reprodução de um discurso legitimador para a agremiação na região. Através de uma espécie de discurso vencedor, desde os motivos para a fundação de uma nova escola para a região até os carnavais vencedores, a identidade local foi estabelecida em um movimento dialético, pois o lugar passou a ser identificado pela escola de samba, e esta e seus moradores pelo lugar. Assim foi possível identificar na rede familiar do Morro da Serrinha projetos próprios que, através da escola de samba, transpuseram barreiras sociais e angariaram benefícios para a região.

Planting Sea Trout Ova 1952

Three men planting out Sea trout ova in a beck in North West England, UK, in 1952. This photo is part of a Photo Album that includes pictures from 1935 to 1954.

Caribbean corals in crisis: record thermal stress, bleaching, and mortality in 2005

Background: The rising temperature of the world’s oceans has become a major threat to coral reefs globally as the severity and frequency of mass coral bleaching and mortality events increase. In 2005, high ocean temperatures in the tropical Atlantic and Caribbean resulted in the most severe bleaching event ever recorded in the basin. Methodology/Principal Findings: Satellite-based tools provided warnings for coral reef managers and scientists, guiding both the timing and location of researchers’ field observations as anomalously warm conditions developed and spread across the greater Caribbean region from June to October 2005. Field surveys of bleaching and mortality exceeded prior efforts in detail and extent, and provided a new standard for documenting the effects of bleaching and for testing nowcast and forecast products. Collaborators from 22 countries undertook the most comprehensive documentation of basin-scale bleaching to date and found that over 80% of corals bleached and over 40% died at many sites. The most severe bleaching coincided with waters nearest a western Atlantic warm pool that was centered off the northern end of the Lesser Antilles. Conclusions/Significance: Thermal stress during the 2005 event exceeded any observed from the Caribbean in the prior 20 years, and regionally-averaged temperatures were the warmest in over 150 years. Comparison of satellite data against field surveys demonstrated a significant predictive relationship between accumulated heat stress (measured using NOAA Coral Reef Watch’s Degree Heating Weeks) and bleaching intensity. This severe, widespread bleaching and mortality will undoubtedly have long-term consequences for reef ecosystems and suggests a troubled future for tropical marine ecosystems under a warming climate

Maryland commercial fisheries statistics, 1951-1952

This bulletin is the third of a series begun in 1948, presenting detailed data on the commercial fin-fishery of Maryland. A full description of the techniques of collection and tabulation were included in the first bulletin [Publication 69], and inasmuch as identical procedures have been employed throughout the program, further mention of methods is not made. As in past years, records were received on a voluntary basis from approximately 94% of all licensed fishermen. Most of the records were submitted in the form of weekly or monthly summaries. The statistics set forth were derived from records obtained only from licensed commercial fishermen and contain no data pertaining to small unlicensed units of fishing gear, or to the sport fishery.

East African Fisheries Research Organization Annual Report 1952

Several important advances have been made in our knowledge both regarding the factors which determine fertility in tropical lakes and the fish that live in them. As a result of our investigations a new theory has been put forward regarding the part played by animals in the bionomics of a lake; this theory, stated somewhat baldly, is that within certain limits the greater the number of animals in a shallow tropical lake, the greater becomes its potential fertility, and therefore the greater the number of animals it can support. The theory arises as a logical conclusion, once we accept the fact that the rate of production in such a lake is determined by the rate at which organic matter is decomposed. Bottom deposits which consist mainly of vegetable matter decompose slowly, whereas deposits which contain a high proportion of matter of animal origin decompose more rapidly. Thus the more animals in a lake, particularly animals which feed on plant material, the faster the biological cycle can proceed and the greater the density of animals it can support. This new concept will have a very profound influence on our ideas concerning the consequences of overfishing tropical waters. It also shows that efforts must be made to encourage and protect all herbivorous and detritus feeding animals, whether they be copepods, fish, or hippopotami, and whether they are of immediate economic importance or not.

Annual Report of the Game and Fisheries Department for the year ended 31st December 1952

The annual report presents information on Lake Victoria, Lake Albert (including tbe Albert Nile and associated Fisheries)-Report by Lake Albert Fisheries Officer,Lake Kyoga and Waters of Eastern Uganda-Report by Fisheries Officer, Serere. Lakes George, Edward and Waters of Western Uganda -Report by the Fisheries Officer, Kichwamba Fish Farming-Report by the Fisheries Officer, Fish Fanning,dams,crocodiles. It presents information on angaling, Trouting, Nile Perch and Ripon Falls Barbel

Filariasis research annual report 1952

This 1952 report gives details of findings in the Southern and Southern Highlands Provinces. Accordingly in this publication a return is made to the more usual method of presentation, a summary being given of work done, with detailed sectional reports.