CORE

Massive Birmingham Protest March$ May 11, 1963, Washington, D.C.https://dh.howard.edu/og_circulars/1048/thumbnail.jp

Baltic cod recruitment – the impact of climate variability on key processes

Large-scale climatic conditions prevailing over the central Baltic Sea resulted in declining salinity and oxygen concentrations in spawning areas of the eastern Baltic cod stock. These changes in hydrography reduced the reproductive success and, combined with high fishing pressure, caused a decline of the stock to the lowest level on record in the early 1990s. The present study aims at disentangling the interactions between reproductive effort and hydrographic forcing leading to variable recruitment. Based on identified key processes, stock dynamics is explained using updated environmental and life stage-specific abundance and production time-series. Declining salinities and oxygen concentrations caused high egg mortalities and indirectly increased egg predation by clupeid fish. Low recruitment, despite enhanced hydrographic conditions for egg survival in the mid-1990s, was due to food limitation for larvae, caused by the decline in the abundance of the copepod Pseudocalanus sp. The case of the eastern Baltic cod stock exemplifies the multitude effects climatic variability may have on a fish stock and underscores the importance of knowledge of these processes for understanding stock dynamics

Identifying eastern Baltic cod nursery grounds using hydrodynamic modelling: knowledge for the design of Marine Protected areas

Knowledge of the spatial and temporal distribution of juvenile cod is essential to closing the life cycle in population dynamic models, and it is a prerequisite for the design of Marine Protected Areas (MPAs) aiming at the protection of juveniles. In this study, we use a hydrodynamic model to examine the spatial distribution of eastern Baltic cod larvae and early juveniles. The transport patterns of the larvae spawned at the three major spawning grounds in the central Baltic Sea were investigated by drift model simulations for the period 1979–2004. We analysed potential habitats for their suitability for juvenile settlement, i.e. the change from pelagic to demersal life. The results revealed a clear dependence of the probability for successful settling on wind-induced drift of larval cod, which is controlled by the local atmospheric conditions over the Baltic Sea. Furthermore, we found evidence that the final destinations of juvenile cod drift routes are affected by decadal climate variability. Application of the methodology to MPA design is discussed, e.g. identifying the overlap of areas with a high probability of successful juvenile cod settlement and regions of high fishing effort in small-meshed fisheries targeting sprat and herring

Supporting learning beyond the classroom: developing the Northumbria Learner Support Model

Academic Libraries traditionally offered support for a variety of information related queries. As the storage and delivery of information changed, libraries increasingly became involved in supporting students to use the new technologies and the widening focus of Higher Education to encompass the development of skills for life, added another new dimension. It was no longer enough simply to provide students with an answer but rather to support them to develop the skills to enable them to find answers themselves. The impact of the widening participation agenda meant that different levels and methods of support were required as standard and often over a 24x7 period. The deficit support model began to give way to a more holistic, collaborative view of student support within libraries and learning styles/ help seeking behaviours began to be taken into account (Weaver 2008). The ‘Learner Support Model’ was introduced by Library and Learning Services in 2004/5 as part of an overall strategy to enhance student learning, retention, performance and achievement. All students do not automatically have effective research, IT or study skills but those who do develop those skills will make increased use of high quality information sources, are liable to return better academic performances and are therefore more likely to complete their programmes. The generic nature of the support model ensures that students can access support wherever they are; in whatever discipline area they are working and at whatever time they need it. In the four years since the model was implemented it has moved from a theoretical ideal to a well subscribed support service handling around 90,000 enquiries per year. The Learner Support Model has been showcased at conferences, evaluated through feedback and now developed to a position where it can be extended to other services and student facing academic support areas of Northumbria University and beyond

Core-core and core-valence correlation

The effect of (1s) core correlation on properties and energy separations was analyzed using full configuration-interaction (FCI) calculations. The Be 1 S - 1 P, the C 3 P - 5 S and CH+ 1 Sigma + or - 1 Pi separations, and CH+ spectroscopic constants, dipole moment and 1 Sigma + - 1 Pi transition dipole moment were studied. The results of the FCI calculations are compared to those obtained using approximate methods. In addition, the generation of atomic natural orbital (ANO) basis sets, as a method for contracting a primitive basis set for both valence and core correlation, is discussed. When both core-core and core-valence correlation are included in the calculation, no suitable truncated CI approach consistently reproduces the FCI, and contraction of the basis set is very difficult. If the (nearly constant) core-core correlation is eliminated, and only the core-valence correlation is included, CASSCF/MRCI approached reproduce the FCI results and basis set contraction is significantly easier