22 documents found, page 1 of 3
Microplastic contamination and ecological status of freshwater ecosystems: a ca...
Ribeiro, Andreia; Gravato, Carlos; Cardoso, João Filipe Soares; Ribeiro, Carlos Alexandre; Vieira, Maria Natividade; Rodrigues, CarolinaBackground: Most European rivers have not yet achieved “good” ecological status. In addition, the presence and abundance of microplastics (MPs) in freshwater is a matter of great concern to the scientific community. Methodology: This study assesses the ecological status of four sampling sites of Selho (S1–S4) and Costa-Couros (C1–C4) rivers (Guimarães, Portugal), and the abundance of MPs in sediments and benthi...
Using zebrafish embryo bioassays combined with high-resolution mass spectrometr...
Wilson, Estibali Wilkie; Castro, Verónica; Chaves, Raquel S.; Espinosa, Miguel; Rodil, Rosario; Quintana, José Benito; Vieira, Maria NatividadeSeveral studies show that many water bodies in developing countries are increasingly affected by anthropogenic pressure, such as agricultural activities, domestic and industrial wastewater. However, data is scarce in several of such countries, including Panama. Thus, in this work, the ecotoxicological status of selected rivers in Panama with distinct input sources were evaluated using the zebrafish (Danio rerio...
Phylogeography of the shanny Lipophrys pholis (Pisces: Blenniidae) in the NE At...
Francisco, Sara Martins; Faria, Cláudia Barreiros Macedo de; Lengkeek, W.; Vieira, Maria Natividade; Velasco, Eva Maria; Almada, Vítor CarvalhoThe study of the phylogeography of inshore fish from West Europe is revealing diverse geographical and demographical patterns. Some species conform to the phylogeographic patterns typical of terrestrial organisms, with marked signatures of the last glaciation and a decline of genetic diversity to the north of the species range. Other species, however, reveal no decline in diversity with latitude and signatures ...
Reversing sex role reversal: compete only when you must
Silva, K.; Vieira, Maria Natividade; Almada, Vítor Carvalho; Monteiro, Nuno MiguelThe operational sex ratio (OSR) is thought to be a major factor influencing the intensity of mating competition and sexual selection. Even though many studies on species with conventional sex roles have shown that alterations in the OSR can either intensify male–male competition or promote female–female competitive interactions, sometimes resulting in a reversal of sex roles, it is not known how, and how quickl...
Phylogeography and demographic history of Atherina presbyter (Pisces: Atherinid...
Francisco, Sara Martins; Castilho, Rita; Soares, Miguel; Congiu, Leonardo; Brito, Alberto; Vieira, Maria Natividade; Almada, Vítor CarvalhoA fragment of the mitochondrial control region was used to assess phylogeographic patterns and historical demography of the sand-smelt Atherina presbyter in the North-eastern Atlantic, covering its geographical range. A striking result is the highly marked diVerentiation between the Canary Islands population and western European ones. A genetic structure among European populations of A. presbyter was revealed, ...
Female reproductive tactics in a sex-role reversed pipefish: scanning for male ...
Silva, K.; Almada, Vítor Carvalho; Vieira, Maria Natividade; Monteiro, Nuno MiguelTheoretical studies predict that females should invest in current reproduction according to both the expected payoffs from mating with different-quality males and their future mating prospects. The Syngnathidae family, with its male pregnancy together with the occurrence of varying degrees of sex-role reversal, constitutes an exceptional model to study female allocation strategies. The present work tests for th...
Can the limited marsupium space be a limiting factor for Syngnathus abaster wit...
Silva, K.; Vieira, Maria Natividade; Almada, Vítor Carvalho; Monteiro, Nuno Miguel1. Some syngnathid species show varying degrees of sex role reversal aside from male pregnancy, with females competing for access to mates and sometimes presenting conspicuous secondary sexual characters. Among other variables, brooding space constraints are usually considered a key element in female reproductive success, contributing strongly to the observed morphological and behavioural sexual differences. Ne...
The effect of temperature on mate preferences and female-female interactions in...
Silva, K.; Vieira, Maria Natividade; Almada, Vítor Carvalho; Monteiro, Nuno MiguelDespite much effort to ascertain the consequences of temperature variation for a wide range of animal performance traits, the effect of temperature on interactions among organisms is still poorly understood. The present work tests for a direct influence of water temperature on sexual recognition, mate preferences and femaleefemale interactions in the pipefish, Syngnathus abaster. Three experiments were conducte...
Reproductive behaviour of the black-striped pipefish Syngnathus abaster (Pisces...
Silva, K.; Monteiro, Nuno Miguel; Vieira, Maria Natividade; Almada, Vítor CarvalhoThe reproductive behaviour of Syngnathus abaster is described and compared with those of other syngnathids. The need for standardized behavioural data is discussed in light of the actual theories of evolution of mating patterns and sex-role reversal within this family.
Contrasts in genetic structure and historical demography of marine and riverine...
Francisco, Sara Martins; Cabral, Henrique; Vieira, Maria Natividade; Almada, Vítor CarvalhoIn this paper, we compare the genetic structure and the historical demography of two populations of the sand smelt Atherina boyeri from the rivers Tagus and Mondego (Portugal) with two groups of samples of the closely related marine Atherina presbyter collected on the shore at comparable latitudes. A. presbyter is a pelagic marine inshore fish, while A. boyeri is typically found in coastal lagoons, estuaries an...