Path characteristics and colony arrival-departure statistics of king penguins (Aptenodytes patagonicus) on Possession and Kerguelen Island

Orientation based on visual cues can be extremely difficult in crowded bird colonies due to the presence of many individuals. We studied king penguins (Aptenodytes patagonicus) that live in dense colonies and are constantly faced with such problems. Our aims were to describe adult penguin homing paths on land and to test whether visual cues are important for their orientation in the colony. We also tested the hypothesis that older penguins should be better able to cope with limited visual cues due to their greater experience. We collected and examined GPS paths of homing penguins. In addition, we analyzed 8 months of penguin arrivals to and departures from the colony using data from an automatic identification system. We found that birds rearing chicks did not minimize their traveling time on land and did not proceed to their young (located in creches) along straight paths. Moreover, breeding birds' arrivals and departures were affected by the time of day and luminosity levels. Our data suggest that king penguins prefer to move in and out of the colony when visual cues are available. Still, they are capable of navigating even in complete darkness, and this ability seems to develop over the years, with older breeding birds more likely to move through the colony at nighttime luminosity levels. This study is the first step in unveiling the mysteries of king penguin orientation on land.

Healthy aging : Free time of adults

El trabajo que aquí se presenta surge de la necesidad de conceptualizar y profundizar sobre el uso productivo del tiempo libre de las personas adultas mayores. Se llevará a cabo una aproximación teórica sobre las diferentes concepciones de tiempo libre y ocio como dimensiones interdisciplinarias que involucran elementos referidos al entorno en donde personas y comunidades buscan integrarse en un tiempo y espacio determinado

Os jovens agricultores familiares e a reproduçao geracional na agricultura familiar : Estudo de caso dos jovens residentes no município de Faxinal do Soturno - Brasil

This study examines how the youth's Professional projects in new generation of family farmers are prepared and the perspective of reproduction of the familiar mode of production. The sociological task is to specify the distinctive features of the situation of the youth in family farming, seeking to identify the elements considered in the preparation of their professional projects. Qualitative data were produced by a case study of young farmers who lives in the city of Faxinal do Soturno, a municipality belonging to the fourth colony of Italian immigration in Rio Grande do Sul/Brazil. We performed 36 interviews, consisting of open questions, adopting a semi-structured script, wich were examined by de method of content analysis. Among the results, were observed a context marked by professional projects that breaks with the succession of the family farm work. The negative ratings on agricultural work stand out, particularly on issues related to health, salubrity of work and conditions of aging in rural areas. Family and emotional issues, and also specific aspects of the juvenile condition, marked by the pursuit of autonomy and emancipation, permeate the professional projects in development and show a complex analytical framework, wich amplify the explanatory factors of migration of youth.

Os jovens agricultores familiares e a reproduçao geracional na agricultura familiar : Estudo de caso dos jovens residentes no município de Faxinal do Soturno - Brasil

This study examines how the youth's Professional projects in new generation of family farmers are prepared and the perspective of reproduction of the familiar mode of production. The sociological task is to specify the distinctive features of the situation of the youth in family farming, seeking to identify the elements considered in the preparation of their professional projects. Qualitative data were produced by a case study of young farmers who lives in the city of Faxinal do Soturno, a municipality belonging to the fourth colony of Italian immigration in Rio Grande do Sul/Brazil. We performed 36 interviews, consisting of open questions, adopting a semi-structured script, wich were examined by de method of content analysis. Among the results, were observed a context marked by professional projects that breaks with the succession of the family farm work. The negative ratings on agricultural work stand out, particularly on issues related to health, salubrity of work and conditions of aging in rural areas. Family and emotional issues, and also specific aspects of the juvenile condition, marked by the pursuit of autonomy and emancipation, permeate the professional projects in development and show a complex analytical framework, wich amplify the explanatory factors of migration of youth.

Healthy aging : Free time of adults

El trabajo que aquí se presenta surge de la necesidad de conceptualizar y profundizar sobre el uso productivo del tiempo libre de las personas adultas mayores. Se llevará a cabo una aproximación teórica sobre las diferentes concepciones de tiempo libre y ocio como dimensiones interdisciplinarias que involucran elementos referidos al entorno en donde personas y comunidades buscan integrarse en un tiempo y espacio determinado

Healthy aging : Free time of adults

El trabajo que aquí se presenta surge de la necesidad de conceptualizar y profundizar sobre el uso productivo del tiempo libre de las personas adultas mayores. Se llevará a cabo una aproximación teórica sobre las diferentes concepciones de tiempo libre y ocio como dimensiones interdisciplinarias que involucran elementos referidos al entorno en donde personas y comunidades buscan integrarse en un tiempo y espacio determinado

Os jovens agricultores familiares e a reproduçao geracional na agricultura familiar : Estudo de caso dos jovens residentes no município de Faxinal do Soturno - Brasil

This study examines how the youth's Professional projects in new generation of family farmers are prepared and the perspective of reproduction of the familiar mode of production. The sociological task is to specify the distinctive features of the situation of the youth in family farming, seeking to identify the elements considered in the preparation of their professional projects. Qualitative data were produced by a case study of young farmers who lives in the city of Faxinal do Soturno, a municipality belonging to the fourth colony of Italian immigration in Rio Grande do Sul/Brazil. We performed 36 interviews, consisting of open questions, adopting a semi-structured script, wich were examined by de method of content analysis. Among the results, were observed a context marked by professional projects that breaks with the succession of the family farm work. The negative ratings on agricultural work stand out, particularly on issues related to health, salubrity of work and conditions of aging in rural areas. Family and emotional issues, and also specific aspects of the juvenile condition, marked by the pursuit of autonomy and emancipation, permeate the professional projects in development and show a complex analytical framework, wich amplify the explanatory factors of migration of youth.

Colony-specific investigations reveal highly variable responses among individual corals to ocean acidification and warming

As anthropogenic climate change is an ongoing concern, scientific investigations on its impacts on coral reefs are increasing. Although impacts of combined ocean acidification (OA) and temperature stress (T) on reef-building scleractinian corals have been studied at the genus, species and population levels, there are little data available on how individual corals respond to combined OA and anomalous temperatures. In this study, we exposed individual colonies of Acropora digitifera, Montipora digitata and Porites cylindrica to four pCO2-temperature treatments including 400 µatm-28 °C, 400 µatm-31 °C, 1000 µatm-28 °C and 1000 µatm-31 °C for 26 days. Physiological parameters including calcification, protein content, maximum photosynthetic efficiency, Symbiodinium density, and chlorophyll content along with Symbiodinium type of each colony were examined. Along with intercolonial responses, responses of individual colonies versus pooled data to the treatments were investigated. The main results were: 1) responses to either OA or T or their combination were different between individual colonies when considering physiological functions; 2) tolerance to either OA or T was not synonymous with tolerance to the other parameter; 3) tolerance to both OA and T did not necessarily lead to tolerance of OA and T combined (OAT) at the same time; 4) OAT had negative, positive or no impacts on physiological functions of coral colonies; and 5) pooled data were not representative of responses of all individual colonies. Indeed, the pooled data obscured actual responses of individual colonies or presented a response that was not observed in any individual. From the results of this study we recommend improving experimental designs of studies investigating physiological responses of corals to climate change by complementing them with colony-specific examinations.