Miguel Guerreiro

University of Lisbon | UL · Faculty of Science

One of the chief consequences of climate change is the worldwide redistribution of species in the pursuit of physiologically and ecologically favourable conditions. As part of one of the most threatened groups of vertebrates, assessing how climate change may affect the distribution patterns of key shark species is essential for their long-term cons...

While most coastal communities are expected to, or have been, negatively impacted by climate change, cephalopods have generally thrived with shifting ocean conditions. However, whilst benefitting from the same physiological flexibility that characterizes cephalopods in general, cuttlefish have depth constraints imposed by the presence of a cuttlebo...

One of the chief consequences of climate change is the worldwide redistribution of species in the pursue of physiologically and ecologically favourable conditions. As part of one of the most threatened groups of vertebrates, assessing how climate change may affect the distribution patterns of key shark species is essential for their long-term conse...

Climate change is expected to have major negative effects on marine life across phylogenetic groups. Cephalopods, however, have life history characteristics that suggest they may benefit from certain climate change scenarios. Of all cephalopods, squids reach the greatest biomasses; as a result, they are of substantial importance for human and preda...

While most coastal communities are expected to have been negatively impacted by climate change, cephalopods have thrived with shifting ocean conditions. However, whilst benefitting from the same physiological flexibility that characterized cephalopods, cuttlefish remain bounded to specific locations by their particularly low vagility. To test the b...

Climate change is expected to produce major effects across marine life, and cephalopods seem to benefit from these effects. Of these animals, squids exhibit the greatest levels of biomass and of a substantial importance for human consumption. To test the hypothesis that effects of climate change are beneficial for commercial squid, we used species...

Introduction Historically considered to be a single cosmopolitan species, the so called Octopus vulgaris species complex (OVSC) is now recognized to be a group of (at least) six cryptic species: O. americanus (in the west Atlantic), O. vulgaris (in the northeast Atlantic and Mediterranean Sea), O. aff. vulgaris (in the region of South Africa), O. t...

Cephalopods are abundant predator mollusks in the ocean, with squids being the most prominent in human consumption. In the last sixty years, commercial cephalopod populations have increased and expanded poleward, due to their high flexibility. However, physiological and modelling studies have shown impairments and declines for these animals in futu...

Understanding the underlying ecological factors that affect the distribution patterns of organisms is vital for their conservation. Cephalopods such as giant warty squids Moroteuthopsis longimana are important in the diets of marine predators, including grey-headed albatrosses Thalassarche chrysostoma , yet our understanding of their habitat and tr...

The Atlantic Ocean is the second largest water mass on the globe, with a complex biogeochemical system. As such, prokaryots have available a myriad of different environments to exploit resources, namely, nitrogen compounds, in which they participate and manipulate to form the nitrogen cycle. In this study we aim to characterize the microbial phylog...

The Atlantic Ocean is the second largest water mass on the globe, with a complex biogeochemical system. As such, prokaryots have available a myriad of different environments to exploit resources, namely, nitrogen compounds, in which they participate and manipulate to form the nitrogen cycle. In this study we aim to characterize the microbial phylog...

The colossal squid Mesonychoteuthis hamiltoni (Robson 1925) is the largest (heaviest) living invertebrate and although it is preyed upon by many top predators, its basic biology and ecology remain one of the ocean’s great mysteries. The present study aims to review the current biological knowledge on this squid. It is considered to be endemic in th...

Sharks occupy high trophic levels in marine habitats and play a key role in the structure and function of marine communities. Their populations have been declining worldwide by ≥90 %, and their adaptive potential to future ocean conditions is believed to be limiting. Here we experimentally exposed recently hatched bamboo shark (Chiloscyllium puncta...

Little empirical information is currently available on the potential effects of acidification and/or warming in sharks, but none exist about digestive capabilities under such future conditions. Here, we investigated the impact of both acidification (ΔpH = 0.5) and warming (+4; 30 °C) on the digestive enzyme levels of recently hatched tropical bambo...

The cephalopod fauna in Antarctic waters is still poorly known. Here, we assessed the importance of cephalopods in South Georgia (54°S, 38°W) in the diets of albatrosses. The food and feeding ecology of albatrosses during the nonbreeding season is still poorly known, particularly with regard to the cephalopod component. This was studied in black-br...

Although cephalopods play a critical role in marine food webs both as predators and prey, there is a limited knowledge of several basic aspects of their ecology in the Southern Ocean. Here we examined the ecological role of several Southern Ocean cephalopod species by analyzing δ13C and δ15N values in lower cephalopod beaks obtained from diet sampl...

Although cephalopods play a critical role in marine food webs both as predators and prey, there is a limited knowledge of several basic aspects of their ecology in the Southern Ocean. Here we examined the ecological role of several Southern Ocean cephalopod species by analyzing δ13C and δ15N values in lower cephalopod beaks obtained from diet sampl...

The food and feeding ecology of albatrosses during the nonbreeding season is still poorly known, particularly with regard to the cephalopod component. This was studied in black-browed Thalassarche melanophris and grey-headed T. chrysostoma albatrosses by analysing boluses collected shortly after adults returned to colonies at Bird Island, South Geo...

Presentation given at the 2nd edition of the “Jornadas de Investigação em Biologia” hosted at the Faculty of sciences of the University of Lisbon (FCUL). Written In Portuguese.

The Southern Ocean is a key component in the climatic and ecological global system. Cephalopods play an important task in this ecosystem. However, they are difficult to collect and therefore the basic knowledge regarding their ecology is scarce. The wandering albatross, Diomedea exulans, is a cephalopod predator. Here I characterize the cephalopod...

The Southern Ocean is a key component in the climatic and ecological global system. Cephalopods play an important task in this ecosystem. However, they are difficult to collect and therefore the basic knowledge regarding their ecology is scarce. The wandering albatross, Diomedea exulans, is a cephalopod predator. Here I characterize the cephalopod...