|
|
|
| Registros recuperados: 10 | |
|
| |
|
| |
|
|
| Moore, Claire; Lynch, Deirdre; Clarke, Maurice; Officer, Rick; Mills, Jane; Dufour, Jean-louis; Brophy, Deirdre. |
| Sprat is a pelagic species of increasing commercial interest in European waters, yet little is known about its biology or the drivers of its population fluctuations. As a result, the species is currently without an analytical assessment or forecast across much of the North East Atlantic. The objectives of this study were to: verify otolithbased age estimation of sprat; assess the precision, bias and reproducibility of these age estimates; and, determine the age structure of sprat within one North East Atlantic management unit (Celtic Seas ecoregion). Samples were collected over three years (2011, 2013 & 2014) from both commercial catches and scientific surveys. Counts of daily increments in otoliths were used to establish when the first annulus was... |
| Tipo: Text |
Palavras-chave: Sprat; Age verification; Otolith; Marginal increment analysis; Age structure. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00485/59692/62883.pdf |
| |
|
| |
|
| |
|
| |
|
|
| Драпун, И. Е.. |
| Анализировали соотношение полов ( ♀/♂) и возрастную структуру в популяциях 16 видов планктонных остракод (сем. Halocyprididae) из разных районов Южной Атлантики на основе зоопланктонных материалов, собранных в 1976 - 1979 гг. в трех рейсах научных судов. В популяциях планктонных остракод, как правило, преобладали самки, превышая количество самцов в среднем в два - три раза. Величины соотношения полов, заметно отклоняющиеся от 1. а также неравномерное в большинстве случаев распределение в популяциях одновозрастных групп, вероятно, свидетельствуют о периодичности размножения, характерной для большинства видов остракод. Наблюдаемое разнообразие форм возрастных пирамид у массовых видов остракод указывает на возможные различия в их биологии, в частности, на... |
| Tipo: Journal Contribution |
Palavras-chave: Планктонные остракоды; Возрастная структура; Соотношение полов; Южная Атлантика; Planktonic ostracods; Halocyprididae; Age structure; Sex ratio; South Atlantic Sex ratio Sex ratio http://aims.fao.org/aos/agrovoc/c_7014. |
| Ano: 2005 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/218 |
| |
|
|
| Silva,Fatima R J da; Marques,Marinêz I; Battirola,Leandro D; Lhano,Marcos G. |
| Cornops aquaticum (Bruner) has Eichhornia crassipes, E. azurea, Pontederia cordata and P. lanceolata (Pontederiaceae) as the known host plants. This grasshopper species is cited as a possible agent of biological control for native aquatic macrophytes E. azurea and E. crassipes. This study, carried out from March, 2006 to February, 2007, aimed to evaluate the phenology and age structure of the population of C. aquaticum associated with E. azurea in Piuval bay, Pantanal of Poconé, MT, and to identify possible relationships of its life cycle to abiotic factors such as insolation, temperature and precipitation. Monthly collections of 50 individuals were carried out according to the protocol defined by the "Host - Insect Coevolution on Waterhyacinth" project.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic factor; Age structure; Aquatic macrophyte; Grasshopper. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000400011 |
| |
|
| |
|
|
| Fromentin, Jean-marc. |
| A recent body of literature has demonstrated that older females produce larvae and offsprings that have much higher survival and growth than do younger adults and that they furthermore play a key role in the adaptability, persistence and productivity of the exploited fish populations. These findings, that have been shown for several pelagic, groundfish and rockfish species, are, thus, worth to consider for tuna and tuna-like species. The aim of this modest and brief paper is solely to draw the attention from the SCRS to this issue which may have considerable impacts on management regulations. |
| Tipo: Text |
Palavras-chave: Age structure; Genetic diversity; Recruitment success; Sustainability; Management. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/00192/30333/28808.pdf |
| |
| Registros recuperados: 10 | |
|
|
|
