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Registros recuperados: 5
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Comportamento de oviposturas individuais, percentagem de eclosão e peso larval mínimo para pupação em populações de Chrysomya megacephala (F.) Anais da SEB
Von Zuben,Claudio J..
Chrysomya megacephala (F.), a exemplo de muitas outras moscas-varejeiras, utiliza recursos discretos e efêmeros para alimentação e oviposição, tais como carcaças em decomposição. O contexto espacial em que ocorre competição por alimento em C. megacephala caracteriza-se por duas populações: indivíduos adultos dispersando-se e imaturos que são depositados nos substratos pelas fêmeas adultas. O objetivo do estudo foi investigar aspectos da bionomia associados com competição larval por alimento em populações experimentais de C. megacephala, incluindo comportamento de ovipostura e peso mínimo necessário para pupação. Os resultados indicaram que fêmeas depositam parte de seus ovos produzidos, contrastando com estudos anteriores que consideraram apenas ovipostura...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Insecta; Diptera; Moscas-varejeiras; Caracteres bio-nômicos; Competição larval; Insecta; Diptera; Blowflies; Life-history traits; Larval competition.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591998000400004
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Fisheries-induced neutral and adaptive evolution in exploited fish populations and consequences for their adaptive potential ArchiMer
Marty, Lise; Dieckmann, Ulf; Ernande, Bruno.
Fishing may induce neutral and adaptive evolution affecting life-history traits, and molecular evidence has shown that neutral genetic diversity has declined in some exploited populations. Here we theoretically study the interplay between neutral and adaptive evolution caused by fishing. An individual-based eco-genetic model is devised that includes neutral and functional loci in a realistic ecological setting. In line with theoretical expectations, we find that fishing induces evolution towards slow growth, early maturation at small size, and higher reproductive investment. We show, first, that the choice of genetic model (based on either quantitative genetics or gametic inheritance) influences the evolutionary recovery of traits after fishing ceases....
Tipo: Text Palavras-chave: Eco-genetic model; Effective population size; Fisheries-induced evolution; Genetic drift; Genetic erosion; Genetic markers; Life-history traits; Natural selection and contemporary evolution.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00228/33964/33473.pdf
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Investigating spatial heterogeneity of von Bertalanffy growth parameters to inform the stock structuration of common sole, Solea solea, in the Eastern English Channel ArchiMer
Du Pontavice, Hubert; Randon, Marine; Lehuta, Sigrid; Vermard, Youen; Savina-rolland, Marie.
In fisheries science, a mismatch between the delineation of a fish stock and the underlying biological population can lead to inaccurate assessment and management. Previous results suggested a potential spatial structuration of the Eastern English Channel (EEC) stock of common sole, Solea solea, in three sub-populations. In this article, we propose to investigate the spatial population structure of common sole in the EEC using the von Bertalanffy Growth Function parameters as indicators of population segregation. In order to test the sub-population hypothesis and evaluate its robustness to data sources, we developed three models, all including an area effect on growth parameters. The first model was aimed at testing a potential data source effect (in...
Tipo: Text Palavras-chave: Key-words; Von Bertalanffy growth function; Stock structuration; Solea solea; Flatfish; Life-history traits; Metapopulation.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00445/55625/57301.pdf
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Morphometric variation in two intertidal littorinid gastropods Naturalis
Queiroga, H.; Costa, R.; Leonardo, N.; Soares, D.; Cleary, D.F.R..
Here we investigate spatial variation in shell shape of Littorina saxatilis, an ovoviviparous species, and Melarhaphe neritoides, a species with planktonic eggs and larvae. Populations of both species were sampled in 6 sites located along the west coast of the Iberian Peninsula. Shell shape was studied using landmarkbased morphometric methods. Landmark data was used to estimate individual size and to describe shell shape. Prior to statistical analysis specimens were aligned using Generalised Procrustes Analysis (GPA). Ordinations based on GPA of landmark data and using Principal Components Analysis (PCA), revealed a clear spatial segregation of sites for both species, although this was more evident for L. saxatilis than M. neritoides. Statistical analysis...
Tipo: Article / Letter to the editor Palavras-chave: Allometry; Dispersal; Life-history traits; Rocky shores; Shell shape; Western Iberia; 42.72.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/395161
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Temperature, selective mortality and early growth in the short-lived clupeid Spratelloides gracilis ArchiMer
Durieux, Eric; Meekan, Mark G.; Ponton, Dominique; Vigliola, Laurent.
Six cohorts of the silver-stripe round herring Spratelloides gracilis, a fast-growing and short-lived tropical clupeid, were collected as juveniles and then as adults during austral summers from November to February in 1998–1999 and 1999–2000, using light traps in the Dampier Archipelago, Western Australia. Otolith analysis allowed backcalculation of size and growth rate at age to examine the relative influences of selective mortality and water temperature on early growth. Negative sizeselective mortality and growth-selective mortality between the juvenile and the adult stages was found only in the cohort that was the smallest and slowest growing in the period immediately following hatching. Selective mortality preferentially removed members of this cohort...
Tipo: Text Palavras-chave: Environmental factors; Indo-Pacific region; Life-history traits; Otolith; Pelagic fishes; Size.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00008/11940/8643.pdf
Registros recuperados: 5
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