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| Freon, Pierre. |
| Body length variability bas been studied in fish schools and eohorts of two tropical pelagie species. The data, and simulations associated with them allow the variations in standard deviation of cohorts to be followed, and hypotheses on spawning duration or population structure ean thus be tested. As the fish grow, the variability increases more rapidly in young eohorts than in schools with the same mean length. For older fish, the inverse phenomenon is observed: while the standard deviation of individual lengths deereases in a cohort as it gets older, this parameter continued to inerease in sehools as the mean length increases. This shows that schools of young fish eannot be eonsidered as representative of the cohort length frequency distribution, whereas... |
| Tipo: Text |
Palavras-chave: Poissons; Pélagiques côtiers:; Variabilité des tailles; Cohortes; Bancs; Fish; Coastal pelagic; Length variability; Cohorts; Schools. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/00113/22444/20131.pdf |
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| Mariottini,Y.; De Wysiecki,M.L.; Alberti,A.; Lange,C.E.. |
| Abstract Borellia bruneri, a common grasshopper in much of the grasslands of Argentina and Uruguay, is considered, according to the categories widely accepted for defining the pest status of grasshopper species, a “Frequent plague of importance”. In order to determine fundamental aspects of its biology and reproduction, three cohorts of B. bruneri were monitored under controlled conditions (30º C, 14L: 10D, 40% RH). The total duration of nymphal development was 50.6 days, both males and females having five nymphal instars. There was a significant difference in the duration of the different stages within each cohort. In the three cohorts, the first instar duration (12.87 days) was longer than the rest, approximately 5.6 days more than the second that was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Grasshoppers; Cohorts; Longevity; Fecundity; Nymphal development. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262020000100207 |
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