Publications by authors named "P Covelo"
There is little information regarding the ecology of common minke whales (Balaenoptera acutorostrata) in southern waters of the Northeast Atlantic. As such, stomach contents from common minke whales stranded in the west Iberian Peninsula were analysed (n = 27, 2005-2024) to improve the knowledge about the foraging ecology of this species. Overall, small pelagic fish species (Sardina pilchardus, Trachurus sp.
View Article and Find Full Text PDFDespite increasing regulations on their production and use, organic pollutants, such as polychlorinated biphenyls (PCBs), continue to pose a threat to marine life. Odontocete cetaceans are highly susceptible to the accumulation and biomagnification of PCBs due to their role as predators and long life expectancy. Therefore, assessing the levels of PCBs in cetaceans is important to evaluate their health status at the individual and population levels, as well as to provide an indicator of ecosystem health.
View Article and Find Full Text PDFWounding and exogenous auxin are needed to induce adventitious roots in chestnut microshoots. However, the specific inductive role of wounding has not been characterized in this species. In the present work, two main goals were established: First, we prompted to optimize exogenous auxin treatments to improve the overall health status of the shoots at the end of the rooting cycle.
View Article and Find Full Text PDFArticle Synopsis
- The pygmy sperm whale has vibrissae (whisker-like structures) when they are born, but these are lost within months, leaving behind empty vibrissal crypts (VCs).
- A histological study of juveniles and an adult whale revealed that these VCs contain structures that are richly innervated and vascularized, suggesting they serve as sensory organs.
- Key differences between juvenile and adult VCs include degeneration of the dermal papilla and pseudo hair in adults, indicating a postnatal morphological change with functional implications.
Article Synopsis
- * Approximately 47% of stranded porpoises in Portugal and Galicia were confirmed to have died due to fishery interactions, with an additional 11% likely involved in such interactions.
- * The annual average removal of porpoises in Portuguese waters is estimated at 207 individuals, far exceeding the sustainable limit of 22, highlighting the urgent need for effective management and a structured action plan to protect this population.