8 documents found, page 1 of 1
A novel expert-driven methodology to develop thermal response curves and projec...
Sousa, Andreia G.; Fernandez, Marc; Alves, Filipe M. A.; Arranz, Patricia; Dinis, Ana; González García, Laura; Morales, Misael; Lettrich, Matthew D.Over the last decades, global warming has contributed to changes in marine species composition, abundance and distribution, in response to changes in oceanographic conditions such as temperature, acidification, and deoxygenation. Experimentally derived thermal limits, which are known to be related to observed latitudinal ranges, have been used to assess variations in species distribution patterns. However, such...
Unraveling site fidelity and residency patterns of sperm whales in the insular ...
Ferreira, Rita; Steiner, Lisa; Martín, Vidal; Fusar-Poli, Francesca; Dinis, Ana; Kaufmann, Manfred; Fernandez, Marc; Alves, Filipe M. A.Knowledge of the distribution and residency of pelagic marine megafauna, particularly deep-diving species, is scarce due to their high mobility over difficult-to-access oceanic areas and long periods underwater. However, the threatened status of many of these species, such as the sperm whale Physeter macrocephalus, increases the need to obtain quantitative data to support conservation measures. In the warm temp...
Behavioural Ecology Traits of Elusive Deep-Diver Whales Unravel a Complex Socia...
Badenas, Anja; Dinis, Ana; Ferreira, Rita; Sambolino, Annalisa; Hamard, Eliette; Berninsone, Leonardo G.; Fernandez, Marc; Alves, Filipe M. A.Knowledge of the role of individual associations has provided an insightful understanding of the structures of animal societies, especially in highly social mammals such as primates. Yet, this is unbalanced towards marine mammals, particularly to beaked whales, due to their elusive nature. In addition, information on the fundamental drivers of the social structure of these deep-diving animals is still scarce. H...
Large-scale movements of common bottlenose dolphins in the Atlantic : dolphins ...
Dinis, Ana; Molina, Carlota; Tobeña, Marta; Sambolino, Annalisa; Hartman, Karin L.; Fernandez, Marc; Magalhães, Sara; Santos, Rui Peres dosWide-ranging connectivity patterns of common bottlenose dolphins (Tursiops truncatus) are generally poorly known worldwide and more so within the oceanic archipelagos of Macaronesia in the North East (NE) Atlantic. This study aimed to identify long-range movements between the archipelagos of Macaronesia that lie between 500 and 1,500 km apart, and between Madeira archipelago and the Portuguese continental shelf...
Modeling Fine-Scale Cetaceans’ Distributions in Oceanic Islands : Madeira Archi...
Fernandez, Marc; Alves, Filipe M. A.; Ferreira, Rita; Fischer, Jan-Christopher; Thake, Paula; Nunes, Nuno; Caldeira, Rui; Dinis, AnaSpecies distributional estimates are an essential tool to improve and implement effective conservation and management measures. Nevertheless, obtaining accurate distributional estimates remains a challenge in many cases, especially when looking at the marine environment, mainly due to the species mobility and habitat dynamism. Ecosystems surrounding oceanic islands are highly dynamic and constitute a key actor ...
Spatial and temporal distribution of bottlenose dolphins, Tursiops truncatus, i...
Dinis, Ana; Carvalho, A.; Alves, Filipe M. A.; Nicolau, Cátia; Ribeiro, Cláudia; Kaufmann, Manfred; Cañadas, A.; Freitas, LuísOne of the first steps in understanding the relationships between populations and their habitats is to determine which areas they use with higher frequency. This study used systematic and non-systematic survey data from 2001-2002 and 2004-2012 to determine encounter rates and investigate temporal and spatial distribution of bottlenose dolphins around Madeira, Desertas and Porto Santo islands. A total 24,914 km ...
Daytime dive characteristics from six short-finned pilot whales Globicephala ma...
Alves, Filipe M. A.; Dinis, Ana; Ribeiro, Cláudia; Nicolau, Cátia; Kaufmann, Manfred; Fortuna, Caterina M.; Freitas, LuísSix time-depth recorders attached with suction-cups were deployed in resident and transient adult short-finned pilot whales to evaluate their daytime diving characteristics in their preferred habitat area off Madeira Island. Here, data on the proportion of time spent at the surface and at different dive phases (descent, bottom and ascent), dive depths and dive rates are presented. With mean attachment durations...
Two new records of seabreams (Pisces:Sparidae) from the Madeira Archipelago.
Alves, Filipe M. A.; Alves, Catarina M. A.Two Sparidae species, the gilthead seabream Sparus aurata and the striped seabream Lithognathus mormyrus, were recorded during an underwater visual census at Madeira Island between March and October 2000. Several individuals were subsequently caught to confirm the identification. This is the first record of Sparus aurata for Madeira. Escape from a recent open sea aquaculture unit in the area is the most likely ...