Browsing by Author "MENDES, SUSANA"
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- Arsenic accumulation in intertidal macroalgae exposed to sewage dischargesPublication . Cabral-Oliveira, Joana; Coelho, Helena; Pratas, João; MENDES, SUSANA; Pardal, Miguel A.Arsenic is a widely distributed element in marine ecosystems. The main anthropogenic sources of this contaminant are domestic and industrial wastewaters, and since it can be harmful to humans even at low concentrations, it has been ranked as one of the top hazardous substances. Therefore, the analysis of arsenic is an essential task to assess the potential environmental and human health risk associated with sewage discharges. The accumulation of total arsenic on intertidal rocky shore macroalgae exposed to contaminated sewage discharges was measured in five macroalgae species (Asparagopsis armata, Codium sp., Plocamium cartilagineum, Saccorhiza polyschides and Ulva sp.). Differences in the concentrations of arsenic were examined in the seawater and in the macroalgae species. The results showed significantly higher concentrations of arsenic near the sewage discharges in all the species except S. polyschides. Although the information obtained from total arsenic determination is not enough to assess the toxicological risk in the environment, this paper gives an important contribution on contamination risks and helps in choosing potential good biomonitors.
- CO-tucker: a new method for the simultaneous analysis of a sequence of paired tablesPublication . MENDES, SUSANA; Fernández-Gómez, M. José; Cotrim Marques, Sónia; Pardal, Miguel Ângelo; Azeiteiro, Ulisses Miranda; Galindo-Villardón, M. PurificaciónRelationships between species and their environment are a key com ponent to understand ecological communities. Usually, this kind of data are repeated over time or space for communities and their envi ronment, which leads to a sequence of pairs of ecological tables, i.e. multi-way matrices. This work proposes a new method which is a combined approach of STATICO and Tucker3 techniques and deals to the problem of describing not only the stable part of the dynamics of structure–function relationships between communities and their environment (in different locations and/or at different times), but also the interactions and changes associated with the ecosystems’ dynamics. At the same time, emphasis is given to the comparison with the STATICO method on the same (real) data set, where advan tages and drawbacks are explored and discussed. Thus, this study produces a general methodological framework and develops a new technique to facilitate the use of these practices by researchers. Fur thermore, from this first approach with estuarine environmental data one of the major advantages of modeling ecological data sets with the CO-TUCKER model is the gain in interpretability.
- Effect of stocking density and different diets on growth of Percula Clownfish, Amphiprion percula (Lacepede, 1802)Publication . Chambel, João; Severiano, Vera; Baptista, Teresa; MENDES, SUSANA; Pedrosa, RuiThe aim of this study was to evaluate the influence of stocking density (0.5, 1, 2 and 3 fishL−1) and commercial marine fish diets (diet A, B, C and D) over four months on specific growth rate, condition factor, percentage without anomalous pigmentation (partial or total lack of white bands -miss-band) and survival of juvenile Amphiprion percula. Results showed that at 0.5 fishL−1 densities induced the best survival (100%) and also the maximum percentage of fish without miss-band (58.33 +/−4.417%). The maximum SGR was obtained for the 0.5 fishL−1 (0.459 ± 0.023% cm/day). However, the best condition factor (2.53 +/− 0.27) was achieved for 2 fishL−1 densities. There were no significant differences in survival (68.9 to 84.5%), fish without miss-bands (18.03 to 26.92%) and condition factor (1.92 to 2.1) among diets during the experimental period. On the other hand, diet C (with 41% crude protein) supported the best SGR (0.485 ± 0.001% cmday−1). The results suggested that stocking density are critical and more relevant when compared with the different diet tested, namely on specific growth rate, condition factor, the miss-band and survival of juvenile percula clownfish. This study has particular significance with regards to anemonefishes husbandry in terms of survival and production efficiency.
- Observatório para a Saúde dos Estudantes do Instituto Politécnico de Leiria - Relatório Técnico 2024Publication . Graça Henriques, Carolina Miguel; de Matos Gonçalves, Pedro Jorge; Matos, Rui; MENDES, SUSANA; Toneca, Cláudia Andreia Cunha Belém; Oliveira Diz, Susana Cristina; Ferreira, BárbaraO Instituto Politécnico de Leiria está comprometido com a promoção de estilos de vida saudável e ativa na comunidade académica, em alinhamento com a definição de Saúde da Organização Mundial de Saúde (OMS). No âmbito do programa Healthy Campus, a saúde, o bem-estar e os estilos de vida saudáveis são preocupações cada vez mais presentes na nossa Instituição, pelo que solicitámos a colaboração de todos os estudantes para o preenchimento de um questionário, devidamente aprovado pela Comissão de Ética do Instituto Politécnico de Leiria - Parecer N.º CE/IPLEIRIA/53/2023, que se realiza no âmbito do Observatório da Saúde dos Estudantes do Politécnico de Leiria, cujos resultados aqui são apresentados e que nos permitem desenhar intervenções que vão ao encontro das necessidades dos nossos estudantes em matéria de saúde, bem-estar e estilos de vida saudáveis.