economic exploitation through deforestation can be devastating to the long-term economy of developing countries not only by friends tv show luffy goku and naruto shirt annihilating vital ecosystems that afford important services, but also by destroying potential forest products. Accordingly, the volume of tropical hardwood exports
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insufficient research to enable us to have a quantitative understanding of the critical ecological processes and balances that may be unique to polynya areas. It is essential that we rectify the situation because the survival of viable populations or subpopulations of several species of arctic marine birds and mammals may depend on polynyas. Mass mortalities due to disease outbreaks have recently affected major taxa in the oceans. For closely monitored groups like corals and marine mammals, reports of the frequency of epidemics and the number of new diseases have increased recently. A dramatic global increase in the severity of coral bleaching in is coincident with high El Niño temperatures. Such climate-mediated, physiological stresses may compromise host resistance and increase frequency of opportunistic diseases. Where documented, new diseases typically have emerged through host or range shifts of known pathogens. Both climate and human activities may have also accelerated global transport of species, bringing together pathogens and previously unexposed host populations. Marine mammals are important players in the Barents Sea friends tv show luffy goku and naruto shirt ecosystem but their structural role in the foodweb has been little explored. We compare foodweb-related characteristics within and between phylogenetic groups for marine mammals. As a group, they directly connect to the most central species , cod and haddock in the Barents Sea ,. cod and haddock and consume over half of the available species. Pinnipeds are the most homogenous phylogenetic group with high omnivory and high prey richness. Mysticetes are split between well-connected species with high omnivory like the humpback whale, and peripheral specialists like the blue whale. Based on foodweb-derived indices some species consistently cluster together forming two groups, suggesting topological redundancy within them. One is dominated by Arctic seals and the other includes most of the baleen whales. Marine mammals generally contribute to network modularity as their trophic links are mainly within their own module. However, Atlantic species such as the grey seal act as a module connector decreasing modularity. This might negatively affect ecosystem robustness with perturbation effects spreading further and quicker in the foodweb. In the Arctic reaches of the Barents Sea, climate warming is likely to bring about extensive changes in the foodweb structure through a redistribution of species. Spotted seals Phoca largha and bearded seals Erignathus barbatus are ice-associated seals that have overlapping range in the Beaufort, Chukchi, and Bering Seas, but have different foraging ecologies.
The link between foraging behaviour and specific oceanographic variables is not well understood for these species, nor is the influence of different dive metrics when modelling their foraging behaviour. To explore the value of different dive metrics to estimate foraging behaviour, and the relationships between foraging and water bodiesoceanographic variables, we tagged spotted seals and bearded seals with satellite telemetry tags that recorded movement and oceanographic data. To infer foraging behaviour, we included dive metrics in Bayesian state-space switching models, and found that models that included depth-corrected dive duration were more parsimonious than models that included dive shape. The addition of vertical movements to the model enabled better determination of foraging areas inferred from area-restricted searches and provided insights into the probabilities of switching between foraging and transiting behaviours. The collection of oceanographic data in situ at a scale relevant to seals helped identify water masses, and how they were used, and potential oceanographic cues used by seals to identify foraging locations. Fine-scale spatiotemporal clustering analysis revealed spotted and bearded seal foraging ‘hotspots’ in the Chukchi and Bering Seas that overlap with hotspots identified for other marine mammals and marine birds. Forest products play a crucial role in the economy of developing countries, generating more than billion in reported income in the late s, according to the FAO. Roughly percent of that value came from secondary forest products, although that number is likely a gross underestimate since it doesn’t include the value to local, non-market consumers, who use timber to build houses and collect nuts and fruits from the forest for food. Short-term
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