Joana Vasconcelos

Bio: Joana Vasconcelos is an academic researcher from Catholic University of the Most Holy Conception. The author has contributed to research in topics: Population & Limpet. The author has an hindex of 8, co-authored 28 publications receiving 183 citations. Previous affiliations of Joana Vasconcelos include Madeira Tecnopolo & Directorate of Fisheries.

Identifying populations of the blue jack mackerel (Trachurus picturatus) in the Northeast Atlantic by using geometric morphometrics and otolith shape analysis

Abstract: 1 Direção de Serviços de Investigação Direção Regional de Pescas da Região Autónoma da Madeira Estrada da Pontinha 9004-562 Funchal, Madeira, Portugal 2 Centro de Ciências do Mar e do Ambiente (MARE) Quinta do Lorde Marina Sítio da Piedade 9200-044 Caniçal, Madeira, Portugal 3 Universidade da Madeira Faculdade de Ciências da Vida Campus Universitário da Penteada Caminho da Penteada 9020-105 Funchal, Madeira, Portugal 4 MARE Faculdade de Ciências Universidade de Lisboa Rua Ernesto Vasconcelos Campo Grande, 1749-016 Lisboa, Portugal

Endoparasites of Trachurus picturatus (Pisces: Carangidae) from the Madeira and Canary Islands: Selecting parasites for use as tags

Abstract: In order to evaluate the use of parasites as biological tags to identify populations of the oceanic horse mackerel, Trachurus picturatus , two samples of 100 fish each, caught off the Madeira and Canary Islands from January to June 2009, were examined for the presence of anisakids, trypanorhynchs, acanthocephalans and liver coccidians. In T. picturatus from Madeira, prevalence of the coccidian Goussia cruciata reached 82%, whereas prevalence of the nematode Anisakis sp., the acanthocephalan Rhadinorhynchus cadenati and the trypanorhynch Nybelinia lingualis were 12.0%, 8.9% and 7.0%, respectively. In samples from the Canary Islands, prevalence of G. cruciata was 8.0%, Anisakis sp. and R. cadenati reached 5.0% and 42.0% respectively, and N. lingualis was not recovered. The absence of N. lingualis and the lower prevalence of Anisakis sp. appear to be related to the smaller size of the oceanic horse mackerels examined from the Canary Islands. Although significant differences in prevalence of two parasites, G. cruciata and R. cadenati , were found between the two regions investigated (χ 2 =125.13, df=1, p=0.000 and χ 2 =40.77, df=1, p=0.000), only G. cruciata was considered useful as a biological tag for the identification of populations of T. picturatus . In order to reach sound conclusions, an expansion of the temporal and spatial sampling strategy is recommended.

Age and growth of the blue jack mackerel, Trachurus picturatus Bowdich, 1825 (Pisces: Teleostei) off Madeira archipelago.

Abstract: Between 1984 and 1986, 630 pairs of sagitta otoliths were collected to determine the age and growth of the blue jack mackerel, Trachurus picturatus from Madeiran waters. The oldest specimen in this study was nine years old and the largest was 46 cm of total length (TL). The parameters of the von Bertalanffy growth curve were estimated for the whole period studied for all fish (L∞=42.32 cm, k=0.161 year-1, t0= -2.563 year; r2=0.743) for males (L∞=39.57 cm, k=0.194 year-1, t0=-2.282 year; r2=0.722) and for females (L∞=49.78 cm, k=0.114 year-1, t0=-3.052 year; r2 = 0.747). There was no significant differences in mean lengths (t–test, p>0,05) and in the von Bertalanffy growth curves (Ftest, p>0,05) between sexes. The validity of otolith readings for estimating age and growth was supported by results from backcalculation method. No significant differences were found in the Bertalanffy growth curves between direct reading of otoliths and backcalculation. Growth parameters estimated from backcalculated sizes-at-age were: for both sexes, L∞=48.28 cm, k=0.135 year-1, t0=-2.898 year and r2=0.999; for males, L∞=44.79 cm, k=0.143 year-1, t0=-3.207 year, r2=0.999; and females, L∞=44.63 cm, k=0.163 year-1, t0=-2.430 year, r2=0.999. The relationship between length and weight was calculated for all fish (Wt=0.00764Lt3.05746; r2=0.951), for males (Wt=0.01271Lt2.90807; r2=0.915) and for females (Wt=0.00604Lt3.12613; r2=0.948).

Computation And Interpretation Of Biological Statistics Of Fish Populations

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Parasites as biological tags to assess host population structure: Guidelines, recent genetic advances and comments on a holistic approach.

Abstract: We review the use of parasites as biological tags of marine fishes and cephalopods in host population structure studies. The majority of the work published has focused on marine fish and either single parasite species or more recently, whole parasite assemblages, as biological tags. There is representation of host organisms and parasites from a diverse range of taxonomic groups, although focus has primarily been on host species of commercial importance. In contrast, few studies have used parasites as tags to assess cephalopod population structure, even though records of parasites infecting cephalopods are well-documented. Squid species are the only cephalopod hosts for which parasites as biological tags have been applied, with anisakid nematode larvae and metacestodes being the parasite taxa most frequently used. Following a brief insight into the importance of accurate parasite identification, the population studies that have used parasites as biological tags for marine fishes and cephalopods are reviewed, including comments on the dicyemid mesozoans. The advancement of molecular genetic techniques is discussed in regards to the new ways parasite genetic data can be incorporated into population structure studies, alongside host population genetic analyses, followed by an update on the guidelines for selecting a parasite species as a reliable tag candidate. As multiple techniques and methods can be used to assess the population structure of marine organisms (e.g. artificial tags, phenotypic characters, biometrics, life history, genetics, otolith microchemistry and parasitological data), we conclude by commenting on a holistic approach to allow for a deeper insight into population structuring.

Identifying populations of the blue jack mackerel (Trachurus picturatus) in the Northeast Atlantic by using geometric morphometrics and otolith shape analysis

Abstract: 1 Direção de Serviços de Investigação Direção Regional de Pescas da Região Autónoma da Madeira Estrada da Pontinha 9004-562 Funchal, Madeira, Portugal 2 Centro de Ciências do Mar e do Ambiente (MARE) Quinta do Lorde Marina Sítio da Piedade 9200-044 Caniçal, Madeira, Portugal 3 Universidade da Madeira Faculdade de Ciências da Vida Campus Universitário da Penteada Caminho da Penteada 9020-105 Funchal, Madeira, Portugal 4 MARE Faculdade de Ciências Universidade de Lisboa Rua Ernesto Vasconcelos Campo Grande, 1749-016 Lisboa, Portugal