Consulta: subjectFacets:"Census"
Registros recuperados: 11
Data/hora: 05/06/2024 07:59:49

History of marine animal populations: a global research program of the Census of marine life
Provedor de dados: 5
Autores: Holm, P.
This paper examines the relationship between history and science with regard to the marine environment. It argues that historians and scientists should collaborate to reconstruct past ecosystems. Such collaboration to shed some light on the reasons why the life in the oceans appears as it does today. With this objective in view, a global research program has been established. The History of marine animal populations (HMAP) addresses four basic questions. (1) How has the extent and diversity of these populations changed over the last 2000 years? (2) Which factors have influenced these change? (3) What has been the anthropogenic and biological significance of these changes? (4) What has been the interplay of changing marine ecosystems and human societies?...
Tipo: Text
Palavras-chave: Histoire; Vie marine; Recensement; History; Marine life; Census.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43303/43039.pdf

Towards an Autonomous Pelagic Observatory: Experiences from Monitoring Fish Communities around Drifting FADs
Provedor de dados: 5
Autores: Brehmer, Patrice; Sancho, Gorka; Trygonis, Vasilis; Itano, David; Dalen, John; Fuchs, Ariel; Faraj, Abdelmalek; Taquet, Marc.
This work presents a methodological synthesis for the in situ monitoring of fish aggregating devices (FADs) using a combination of optical, echosounder and SCUBA observations conducted in the vicinity of drifting FADs. The acoustic methods allowed, according to the devices used, the description of the spatial organisation and dynamics of biotic scattering layers, individual fishes, schools, shoals and mammals, while visual, photographic and video observations permitted species identification within a range of 0 to ~ 25 m. Based on these results, we elaborate on the interest to combine acoustic and visual methods, and present an autonomous instrumented drifting buoy for remotely monitoring fish diversity and abundance in the pelagic ecosystems. The...
Tipo: Text
Palavras-chave: Optical; Census; Acoustics; Buoy; Seaorbiter; Biomonitoring; Conservation; Environmental monitoring; Fish; Pelagic.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00461/57252/59265.pdf

A census of marine life: Unknowable or just unknown?
Provedor de dados: 5
Autores: Decker, Cj; O'Dor, R.
As an introduction to the entire volume, this article outlines the relationships among the five elements of the Census of Marine Life (CoML) that create new knowledge: (1) The Ocean Biogeographic Information System (OBIS), a marine component of the Global Biodiversity Information Facility, links marine databases around the world to provide an Internet accessible, dynamic interface for comparing species-level, geo-referenced biodiversity data in relation to ocean habitats. The entire CoML field project data will be managed in and accessible through OBIS. (2) The History of Marine Animal Populations (HMAP) is a unique new synthesis of historical and biological research that will document marine biodiversity, globally, up to 500 years ago, before significant...
Tipo: Text
Palavras-chave: Biodiversité; Recensement; Recherche; Biogéographie; Biodiversity; Census; Global; Research; Biogeography.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43299/43035.pdf

Artisanal fishing boats in Seychelles
Provedor de dados: 20
Autores: Payet, R.J.
The results of a census of fishing boats on Mahe, Praslin and La Digue are presented. In total 437 boats were counted of which 278 were outboards with engine, 48 were open whaler, 35 were pirogues, 25 were lekonomi, 22 were schooners, 11 were semi-industrial so were lavenir, 12 were 'others', 8 were whaler with deck, 4 were nouvo lavenir and 3 were wooden boats without engines. The details are discussed to understand the characteristics of the artisanal fishing boats. An analysis of the historical data follows. The number of pirogues and schooners decreased from 1985 to 1995, whilst the numbers of whalers have increased. Outboards on the other hand had remained relatively stable. The changes in the number of boats are a result of interaction between the...
Tipo: Report
Palavras-chave: Fishing boats; Census.
Ano: 1996
URL: http://hdl.handle.net/1834/5123

Efecto del alga invasora Undaria pinnatifida sobre la comunidad de peces de arrecife en los golfos Norpatagónicos
Provedor de dados: 20
Autores: Irigoyen, A.J.
This study investigates the impact of Undaria pinnatifida on the reef  fish assemblage associated with the coastal rocky reefs of Golfo Nuevo in northern Patagonia, Argentina. Undaria pinnatifida is a laminarian kelp, indigenous to the temperate regions of Japan, China and Korea. It has spread around the world by international shipping and has also been introduced in some regions for mariculture. Its expansion into the northern Patagonian gulfs and Peninsula Valdes, a UNESCO Natural Heritage Site, may threaten eco-tourism activities that depend on local biodiversity and the esthetic quality of the ecosystem. In particular, there is concern about the impact of Undaria on a variety of recreational activities including diving, angling and spear fishing, which...
Tipo: Theses and Dissertations
Palavras-chave: Reef fish; Ecological associations; Introduced species; Habitat; Environmental impact; Environmental monitoring; Census; Undaria pinnatifida; Marine environment.
Ano: 2010
URL: http://hdl.handle.net/1834/4774

Essays on Regional Differences in Time Preferences and Attachment to Place
Provedor de dados: 31
Autores: Yi,   Dale.
Data from a national telephone survey of working-aged adults in the continental US is combined with US Census 2000 data to explore the determinants of attachment to place and time preferences for jobs, natural amenities, and financial assets. Five regions in the US were delineated so that regional differences in the determinants of the dependent variables of interest could be parsed out. The regions are the Great Plains, Borderlands, Appalachia, the Plantation Belt, and the rest of the continental US.  The first essay that explores time preferences for jobs, natural amenities, and money. Each was embedded with a ten percent rate of return. In aggregate, the nation as a whole demonstrated that the discount rate for jobs, natural amenities, and financial...
Tipo: Thesis or Dissertation
Palavras-chave: Great Plains; Migration; Time preference; Survey; Community attachment; Social capital; Natural amenity; Economic development; Community; Census; Zip code; Policy; Native American; Community/Rural/Urban Development; Resource /Energy Economics and Policy; R11; R23; R53; R58; Q51; Q52; O13; O15.
Ano: 2009
URL: http://purl.umn.edu/56009

Examining Factors Affecting Population Change in the Southern United States: An Ongoing Case Study
Provedor de dados: 31
Autores: Hill,   Anquinette; Gyawali,   Buddhi Raj; Banerjee,   Swagata (Ban).
Urban sprawl and rural rebound are major foci of recent regional economic studies. Using 1980 and 2000 Census data from 11 southern states, binary logit regressions of population changes in rural-and-metropolitan counties and Black Belt-and-non-Black Belt counties reveal education, poverty, employment, and age differences are related to population changes.
Tipo: Conference Paper or Presentation
Palavras-chave: African Americans; Black Belt; Census; Population change; Rural rebound; Urban Sprawl; Southern; Community/Rural/Urban Development; Labor and Human Capital.
Ano: 2010
URL: http://purl.umn.edu/56598

Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
Provedor de dados: 97
Autores: SEPÚLVEDA,MARITZA; OLIVA,DORIS; URRA,ALEJANDRA; PÉREZ-ÁLVAREZ,MARÍA J; MORAGA,RODRIGO; SCHRADER,DANIEL; INOSTROZA,PATRICIA; MELO,ANGELA; DÍAZ,HUMBERTO; SIELFELD,WALTER.
The onshore distribution and abundance of the South American sea lion Otaria flavescens along the central Chilean coast was estimated during the period January-February 2007. Additionally, changes in population abundance during the period 1970-2007 were examined. Population surveys were based on photographs taken from boats or aircraft. A total of 16301 sea lions (CI = 16209-16375) were counted in 33 colonies (6 breeding and 27 non-breeding sites). After correction to account for the proportion of individuals at sea and for pups not seen at the time of the survey, the mean estimated abundance was 18179 (95 % CI = 17777-18851) sea lions. Population trend analysis showed that from 1970 to 1985, South American sea lions showed a positive increase of...
Tipo: Journal article
Palavras-chave: Census; Chilean coast; Otaria flavescens; Overexploitation; Sea lions.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100007

Avifauna associada ao estuário do Saco da Fazenda, Itajaí, Santa Catarina, Santa Catarina
Provedor de dados: 104
Autores: Branco,Joaquim Olinto.
The estuary is an important feeding and resting site for mixed flocks of coastal seabirds, limnological inhabitants and also edge inhabitants. Once in a month, three census were done on the bird fauna with two hours intervals within observations, during the period from January/96 to December/98. The results showed the presence of 45 species, where 45,7% were regularly observed, while 17,9 occurred seasonally and 36,4% were occasional in the census. The highest abundance occurred during the winter and spring months, and the lowest during the summer and autumn. The medium annual diversity index varied between 1,68 ± 0,36 and 1,82 ± 0,34. The highest similarity of fauna was observed between the years 1997 and 1998.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avifauna; Census; Seasonal changes; Santa Catarina.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000200009

Diurnal and seasonal variability in bird counts in a forest fragment in southeastern Brazil
Provedor de dados: 104
Autores: Antunes,Alexsander Z.
Diurnal variation in detection can influence bird census results. I measured variation in daily and seasonal detections of birds in a forest fragment at Barreiro Rico ranch, Anhembi, state of São Paulo. Birds were recorded on transects of unlimited distance, sampled one day per month, dawn to dusk, between December 2000 and March 2001 (rainy season) and between May and August 2001 (dry season). Significant daily variation in detection occurred during the rainy season, with most detections between dawn and 9 h. In the dry season detections declined for total numbers of individuals and species and most detections occurred during late morning and mid afternoon. Detection patterns might reflect seasonal variation in bird behavior rather than seasonal variation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Census; Detection; Seasonal variation; Transects.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000200011

Bird community as an indicator of biodiversity: results from quantitative surveys in Brazil
Provedor de dados: 42
Autores: VIELLIARD,JACQUES M. E.
This short review presents the results obtained in several localities of Brazil on the composition of forest bird communities. Data were collected since the late 80's, after we introduced a new methodology of quantitative survey, based on acoustic identification and unlimited-radius point census. Although these data are still scattered, they show uniquely precise and coherently comparative patterns of composition of forest bird communities. Our methodology has the advantage of being absolutely non-disturbing, highly efficient in the field and immediately processed. Results confirm that the structure of a bird community is a good indicator of biodiversity, particularly useful where biodiversity is high. Many of these data are available only in unpublished...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds; Community; Census; Brazil; Biodiversity; Conservation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000300006