154 documents found, page 1 of 16
Tidal variation in a rocky inter-tidal fish population : The case of white seab...
Gonçalves, Ana Sofia Ribeiro; Sousa, Liliana Carvalho; Coelho, Pedro Duarte; Almada, Vítor CarvalhoThe rocky inter-tidal habitat is a harsh and fluctuating environment, subject tofrequent disturbances. Field observations of juvenile white seabream Diplodussargus in inter-tidal rocky habitats were conducted to analyse the spatial distri-bution and feeding activity of this species in relation to the tidal cycle. Thedepth at which fish were observed did not change in most tidal phases whilefeeding activity change...
Establishment of a coastal fish in the Azores : Recent colonisation or sudden e...
Stefanni, Sergio; Castilho, Rita; Sala-Bozano, Maria; Robalo, Joana Isabel; Francisco, Sara Martins; Santos, Ricardo Serrão; Marques, N.; Brito, AlbertoThe processes and timescales associated with ocean-wide changes in the distribution of marine species have intrigued biologists since Darwin's earliest insights into biogeography. The Azores, a mid-Atlantic volcanic archipelago located >1000 km off the European continental shelf, offers ideal opportunities to investigate phylogeographic colonisation scenarios. The benthopelagic sparid fish known as the common t...
Agonistic behaviour and shoal composition of juvenile Diplodus sargus : First f...
Gonçalves, Ana R.; Silva, Matheus Augusto Farias da; Vendrell, Catarina L.; Almada, Vítor CarvalhoBehavioural observations of juvenile Diplodus sargus in natural habitats were conducted to test whether agonistic interactions occur in natural circumstances and, if they do, in which context they happen. The level of aggression and the shoals composition were also compared between distinct natural habitats. Behavioural observations were also conducted in captivity, and the level of aggression was comparedwith ...
Ex situ reproduction of Portuguese endangered cyprinids in the context of their...
Santos, Carla Sousa; Gil, Fátima; Almada, Vítor CarvalhoInexistente
Phylogeographic pattern and glacial refugia of a rocky shore species with limit...
Francisco, Sara Martins; Almada, Vítor Carvalho; Faria, Cláudia Barreiros Macedo de; Velasco, Eva Maria; Robalo, Joana IsabelPhylogeographic patterns among coastal fishes are expected to be influenced by distinct ecological, biological and life history traits, along with historical events and oceanography (past and present). This study focuses on the broad range phylogeography of the Montagu’s blenny Coryphoblennius galerita, a species with well-known ecological features, strictly tied to rocky environments and with limited dispersal...
Spawning behaviour of a threatened Iberian cyprinid and its implications for co...
Santos, Carla Sousa; Robalo, Joana Isabel; Almada, Vítor CarvalhoThis study presents the first ethological description of the reproductive behaviour of the cyprinid Squalius pyrenaicus, endemic to the Iberian Peninsula. The behavioural pattern of this endangered species during the breeding season is non-communal and includes the preparation of a spawning pit (depressions in the substratum) by males, a behaviour not described for Iberian cyprinids so far but already reported ...
Spatial heterogeneity in the Mediterranean Biodiversity Hotspot affects barcodi...
Geiger, Matthias F.; Herder, Fabian; Monaghan, Michael T.; Almada, Vítor Carvalho; Barbieri, Roberta; Bariche, Michel; Berrebi, Patrick; Bohlen, JörgIncomplete knowledge of biodiversity remains a stumbling block for conservation planning and even occurs within globally important Biodiversity Hotspots (BH). Although technical advances have boosted the power of molecular biodiversity assessments, the link between DNA sequences and species and the analytics to discriminate entities remain crucial. Here, we present an analysis of the first DNA barcode library f...
Gaidropsarus (Gadidae, Teleostei) of the North Atlantic Ocean: A brief phylogen...
Francisco, Sara Martins; Robalo, Joana Isabel; Stefanni, Sergio; Levy, André; Almada, Vítor CarvalhoThe phylogenetic relationships among theNorth Atlantic Gaidropsarus and between the three Gaidropsarinae genera Gaidropsarus, Ciliata and Enchelyopus are reviewed with the hitherto most comprehensive taxonomic sampling of this group. Phylogenetic results (maximum parsimony, maximum likelihood and Bayesian inference) based on nuclear (rhodopsin) and concatenated mitochondrial (12s, 16s and cytb)markers clearly s...
Different stocks of brook lamprey in Spain and their origin from Lampetra fluvi...
Pereira, Ana Martins; Doadrio, Ignacio; Robalo, Joana Isabel; Almada, Vítor CarvalhoUsing the mitochondrial non-coding region I, it was shown that the two Spanish Lampetra planeri populations (Cares–Deva and Olabidea–Ugarana) correspond to different genetic units. The Cares–Deva population is probably a recent offshoot of Lampetra fluviatilis, being the Olabidea–Ugarana population less diverse and of older origin.
Ichthyofauna of the Selvagens Islands. Do small coastal areas show high species...
Almada, Frederico José Oliveira de; Abecasis, David; Villegas-Ríos, David; Henriques, Sofia; Pais, Miguel P.; Batista, Marisa I.; Costa, Bárbara Horta eThe Selvagens Islands are located in the northeastern Atlantic between the Canary Islands and Madeira Island. As a result of their small size, remote location and harsh sea conditions only a few studies have been conducted to describe their marine species diversity. We were able to identify 29 new coastal fish species, an increase of 33% in the ichthyofauna described for these islands (n = 88). There is a preva...