Hemoglobin type, egg buoyancy, and antifreeze glycoprotein production as mechanisms for adaptive variation in Gulf of Maine Atlantic cod (Gadus morhua)

Three physiological traits were examined to compare captive populations of winter- and spring-spawning cod from the Gulf of Maine, as differences in these traits have been observed in other locally-adapted subpopulations. Daily mean neutral buoyancy of hatchery-spawned eggs was observed at three temperatures (5, 10, and 12°C) and three photoperiods (15:9, 9:15, and 24:0 L: D) at 12°C. Body fluids of larvae held at 0°C for five days were tested for antifreeze glycoproteins (AFGPs) to determine the onset of AFGP production. Juveniles held at 0°C were bled between 20 and 35 days to determine induction time for AFGP production. Hemoglobin type was determined by isoelectric focusing of blood from hatchery-reared adults. No significant differences were found in mean neutral buoyancy (∼1.024 g/mL) or hemoglobin type (mostly HbI-1/2). No AFGPs were detected in larvae. AFGPs were first produced by juveniles on day 30, although no AFGP production differences were found between populations

TVA: A Democratic Method for the Development of a Region\u27s Resources

The world is searching for better and more efficient ways to use natural resources without loss of individual freedom or the destruction or negation of the initiative and energies of individuals. The Tennessee Valley is demonstrating that this can be done; that the people--farmers, workers, businessmen and citizens generally-- can mobilize their energies around the use of a great river and the more productive development of the forests and the minerals and the soil. The people of this Valley have proved that as they do these things agriculture and industry thrive and diversify and the individual finds greater freedom of opportunity for his talents. The Tennessee Valley region has a long way to go before it comes into its TVA own. But a deep frustration has been dispelled and a discouraging trend has been arrested. And in the process to date perhaps we have learned a little bit more about self-government. Perhaps we have found ways by which the state in serving the individual can help him to achieve voluntarily a better balance between his desire to take and his desire to give. Prosperity from our great physical resources the world over will be as nothing unless we can resolve this conflict within us as individuals. Dollars for methods and works that move us along a little in this direction are good investments. But their real values are beyond the reach of the standard tests of the market place

The continuous similarity model of bulk soil-water evaporation

The continuous similarity model of evaporation is described. In it, evaporation is conceptualized as a two stage process. For an initially moist soil, evaporation is first climate limited, but later it becomes soil limited. During the latter stage, the evaporation rate is termed evaporability, and mathematically it is inversely proportional to the evaporation deficit. A functional approximation of the moisture distribution within the soil column is also included in the model. The model was tested using data from four experiments conducted near Phoenix, Arizona; and there was excellent agreement between the simulated and observed evaporation. The model also predicted the time of transition to the soil limited stage reasonably well. For one of the experiments, a third stage of evaporation, when vapor diffusion predominates, was observed. The occurrence of this stage was related to the decrease in moisture at the surface of the soil. The continuous similarity model does not account for vapor flow. The results show that climate, through the potential evaporation rate, has a strong influence on the time of transition to the soil limited stage. After this transition, however, bulk evaporation is independent of climate until the effects of vapor flow within the soil predominate

The use of ERTS-1 data for the inventory of critical land resources for regional land use planning

Computer-generated spatial and statistical comparisons of critical land resource data derived from conventional sources, RB-57 photographs, and ERTS images, for an eastern Wisconsin test site, suggest that certain critical land resource data can be mapped from ERTS images on a statewide basis. This paper presents one of the biotic resources, wetlands, as an example of the use of ERTS imagery to inventory land resources

Molecular diversity of arbuscular mycorrhizal fungi and patterns of host association over time and space in a tropical forest

We have used molecular techniques to investigate the diversity and distribution of the arbuscular mycorrhizal (AM) fungi colonizing tree seedling roots in the tropical forest on Barro Colorado Island (BCI), Republic of Panama. In the first year, we sampled newly emergent seedlings of the understory treelet Faramea occidentalis and the canopy emergent Tetragastris panamensis, from mixed seedling carpets at each of two sites. The following year we sampled surviving seedlings from these cohorts. The roots of 48 plants were analysed using AM fungal-specific primers to amplify and clone partial small subunit (SSU) ribosomal RNA gene sequences. Over 1300 clones were screened for random fragment length polymorphism (RFLP) variation and 7% of these were sequenced. Compared with AM fungal communities sampled from temperate habitats using the same method, the overall diversity was high, with a total of 30 AM fungal types identified. Seventeen of these types have not been recorded previously, with the remainder being similar to types reported from temperate habitats. The tropical mycorrhizal population showed significant spatial heterogeneity and nonrandom associations with the different hosts. Moreover there was a strong shift in the mycorrhizal communities over time. AM fungal types that were dominant in the newly germinated seedlings were almost entirely replaced by previously rare types in the surviving seedlings the following year. The high diversity and huge variation detected across time points, sites and hosts, implies that the AM fungal types are ecologically distinct and thus may have the potential to influence recruitment and host composition in tropical forests

Evaluation of the application of ERTS-1 data to the regional land use planning process

The author has identified the following significant results. Employing simple and economical extraction methods, ERTS can provide valuable data to the planners at the state or regional level with a frequency never before possible. Interactive computer methods of working directly with ERTS digital information show much promise for providing land use information at a more specific level, since the data format production rate of ERTS justifies improved methods of analysis

The Role of Authentic Leadership and Cultural Intelligence in Cross-Cultural Contexts: An Objectivist Perspective

Cultural adaptation in cross-cultural situations is an integral part of international management and leadership literature. However, there has been little theory or empirical research that takes into account the objectivist perspective of the necessity of leaders remaining true to their moral standards when operating in different host-cultures. We draw upon the authentic leadership and cultural intelligence literatures to explicate a model by which authentic leaders in a cross-cultural context can find a balance in the tension between their own deeply held values and those of the host-country’s culture