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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
05/05/1999 |
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Data da última atualização: |
05/05/1999 |
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Autoria: |
MAGNUSSON, W. E.; CAUGHLEY, G. J.; GRIGG, G. C. |
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Título: |
A double-survey estimate of population size from incomplete counts. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Journal of Wildlife Management, v.42, n.1, p.174-176, 1978. |
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Idioma: |
Inglês |
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Conteúdo: |
The problem of estimating the size of a population from "total counts" known to be inaccurate has been approached from several directions (Table 1). The first 3 are applicable when the entities being counted cannot be distinguished individually, but each of these methods suffers from the requirement that the population is counted, albeit incompletely, on numerous occasions. The effort required is daunting. Caughley (1974) showed that only 2 counts were needed when entities could be identified individually such that the tallies of 2 equally skilled observers could be dissected into those seen by one or other observer and those seen by both. The method was illustrated by Eltringham's (1972) data on groups of elephants (Laxodonta africana) counted and mapped independently by 2 observers during a "complete count" from the air. This note extends that method by dispensing with the requirement that the probability of a given entity being seen by onde observer is the same as its being seen by the other. Hence the method is now generalised to allow for the 2 counts being made by different methods of survey. We will give an example of its use in which nests of the crocodile (Crocodylus porosus) are counted and mapped from the air and from the ground. |
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Palavras-Chave: |
Census; Double-survey; Dupla amostra. |
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Thesagro: |
Censo; População. |
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Thesaurus Nal: |
population. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01834naa a2200217 a 4500
001 1795643
005 1999-05-05
008 1978 bl --- 0-- u #d
100 1 $aMAGNUSSON, W. E.
245 $aA double-survey estimate of population size from incomplete counts.
260 $c1978
520 $aThe problem of estimating the size of a population from "total counts" known to be inaccurate has been approached from several directions (Table 1). The first 3 are applicable when the entities being counted cannot be distinguished individually, but each of these methods suffers from the requirement that the population is counted, albeit incompletely, on numerous occasions. The effort required is daunting. Caughley (1974) showed that only 2 counts were needed when entities could be identified individually such that the tallies of 2 equally skilled observers could be dissected into those seen by one or other observer and those seen by both. The method was illustrated by Eltringham's (1972) data on groups of elephants (Laxodonta africana) counted and mapped independently by 2 observers during a "complete count" from the air. This note extends that method by dispensing with the requirement that the probability of a given entity being seen by onde observer is the same as its being seen by the other. Hence the method is now generalised to allow for the 2 counts being made by different methods of survey. We will give an example of its use in which nests of the crocodile (Crocodylus porosus) are counted and mapped from the air and from the ground.
650 $apopulation
650 $aCenso
650 $aPopulação
653 $aCensus
653 $aDouble-survey
653 $aDupla amostra
700 1 $aCAUGHLEY, G. J.
700 1 $aGRIGG, G. C.
773 $tJournal of Wildlife Management$gv.42, n.1, p.174-176, 1978.
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Registro original: |
Embrapa Pantanal (CPAP) |
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| Registros recuperados : 2 | |
| 1. |  | BARBOSA, A. S.; ARGAÑARAZ, E. R.; BARROS, A. M.; ROSA, A. de C.; ALVES, N. P.; LOUVANDINI, P.; SOUZA-ALT, M. R. d'; NITZ, N.; STURM, N. R.; NASCIMENTO, R. J.; TEIXEIRA, A. R. L. Hitchhiking Trypanasoma cruzi minicircle DNA affects gene expression in human host cells via LINE-1 retrotransponson. Memórias do Instituto Oswaldo Cruz, Rio de Janeiro, v. 101, n. 8, p. 833-843, Dec. 2006.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Cerrados. |
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| 2. | | BASTOS, I. M. D.; GRELLIER, P.; MARTINS, N. F.; CADAVID-RESTREPO, G.; SOUZA-AULT, M. R. de; AUGUSTYNS, K.; TEIXEIRA, A. R. L.; SCHRÉVEL, J.; MAIGRET, B.; SILVEIRA, J. F. da; SANTANA. J. M. Molecular, functional and structural properties of the prolyl oligopeptidase of Trypanosoma cruzi (POP Tc80), which is required for parasite entry into mammalian cells. Biochemical Journal, v. 388, pt. 1, p. 29-38, may, 2005.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: -- - A |
| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| Registros recuperados : 2 | |
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