Reproductive Suicide: Similar Mechanisms of Aging in C. elegans and Pacific Salmon

In some species of salmon, reproductive maturity triggers the development of massive pathology resulting from reproductive effort, leading to rapid post-reproductive death. Such reproductive death, which occurs in many semelparous organisms (with a single bout of reproduction), can be prevented by blocking reproductive maturation, and this can increase lifespan dramatically. Reproductive death is often viewed as distinct from senescence in iteroparous organisms (with multiple bouts of reproduction) such as humans. Here we review the evidence that reproductive death occurs in C. elegans and discuss what this means for its use as a model organism to study aging. Inhibiting insulin/IGF-1 signaling and germline removal suppresses reproductive death and greatly extends lifespan in C. elegans, but can also extend lifespan to a small extent in iteroparous organisms. We argue that mechanisms of senescence operative in reproductive death exist in a less catastrophic form in iteroparous organisms, particularly those that involve costly resource reallocation, and exhibit endocrine-regulated plasticity. Thus, mechanisms of senescence in semelparous organisms (including plants) and iteroparous ones form an etiological continuum. Therefore understanding mechanisms of reproductive death in C. elegans can teach us about some mechanisms of senescence that are operative in iteroparous organisms

The impact of significant input of fine sediment on benthic fauna at tributary junctions: a case study of the Bermejo-Paraguay River confluence, Argentina

This study examines the morphological features, suspended sediment inputs and hydraulic conditions within a large river in association with ecological patterns before and after a tributary confluence. In order to examine these effects, the macroinvertebrate distributions from three reaches of the Paraguay and Bermejo Rivers (Paraguay-Argentina) are investigated. The Bermejo River is a tributary that supplies significant quantities of fine sediment to the Paraguay River, primarily in suspension. Two reaches were examined on the Paraguay River, upstream and downstream of the Bermejo River junction, with the third study reach located on the Bermejo River, upstream of the confluence with the Paraguay River. The results provide clear evidence that a significantly increased loading of fine sediment at a river confluence has effects on the distribution and potential movement of benthic invertebrates in the lotic environment by representing physical barriers at affected sites. These effects may be important at both local and regional scales, and such increases in suspended sediment (especially associated with anthropogenic change) may thus pose a major threat to ecosystem integrity that has been historically underestimated

Colobops: a juvenile rhynchocephalian reptile (Lepidosauromorpha), not a diminutive archosauromorph with an unusually strong bite

Correctly identifying taxa at the root of major clades or the oldest clade-representatives is critical for meaningful interpretations of evolution. A small, partially crushed skull from the Late Triassic (Norian) of Connecticut, USA, originally described as an indeterminate rhynchocephalian saurian, was recently named Colobops noviportensis and reinterpreted as sister to all remaining Rhynchosauria, one of the earliest and globally distributed groups of herbivorous reptiles. It was also interpreted as having an exceptionally reinforced snout and powerful bite based on an especially large supratemporal fenestra. Here, after a re-analysis of the original scan data, we show that the skull was strongly dorsoventrally compressed post-mortem, with most bones out of life position. The cranial anatomy is consistent with that of other rhynchocephalian lepidosauromorphs, not rhynchosaurs. The ‘reinforced snout' region and the ‘exceptionally enlarged temporal region’ are preservational artefacts and not exceptional among clevosaurid rhynchocephalians. Colobops is thus not a key taxon for understanding diapsid feeding apparatus evolution

Revisión taxonómica del género sudamericano Quinchamalium (Schoepfiaceae)

Taxonomic revision of the South American genus Quinchamalium (Schoepfiaceae). The genus Quinchamalium comprises hemiparasitic herbs endemic to South America. Its distribution expands through the Andes from northern Peru to southern Patagonia. The vague morphological limits and the existence of scarce diagnostic characters for the correct identification of the currently accepted species, implies the need for a revision of the taxonomy of the genus. The morphological and biogeographic information along with recently published morphometric analyses indicate the existence of a single polymorphic species: Q. chilense. As a result, a taxonomic treatment of the monospecific genus Quinchamalium is here presented. Valid name, synonyms, description of vegetative and reproductive morphology, and geographical distribution is provided for Q. chilense. In this study, 28 names of species or infraspecific taxa are reduced to synonymy of Q. chilense for the first time. In addition, 13 names are lectotypified and one is neotypified.El género Quinchamalium comprende hierbas hemiparásitas y es endémico de Sudamérica. Su distribución abarca los Andes desde el norte del Perú hasta el sur de la Patagonia. Los límites morfológicos pocos claros y la escasez de caracteres diagnósticos para la correcta identificación de las especies actualmente aceptadas revelan la necesidad de una revisión de la taxonomía del género. La información morfológica y biogeográfica junto con los análisis morfométricos publicados recientemente señalan la existencia de una sola especie polimórfica: Q. chilense. Como resultado, se presenta un tratamiento taxonómico del género monoespecífico Quinchamalium. Para la única especie del género se provee nueva sinonimia, descripción de características morfológicas vegetativas y reproductivas, y distribución geográfica. En este trabajo, 28 nombres de especies o de taxones infraespecíficos son reducidos a la sinonimia de Q. chilense por primera vez. Además, se lectotipifican 13 nombres y uno se neotipific

Genotypic identification of an undescribed spotted fever group rickettsia in ixodes ricinus from southwestern Spain

An undescribed rickettsia was directly analyzed with specific rickettsial molecular biology tools on Ixodes ricinus L. collected in different localities of the province of Cadiz (southwestern Spain). On the basis of the results of the citrate synthase (glta) gene, 190 kD-outer membrane protein (rOmpA) gene, and 16S ribosomal RNA (16S rRNA) gene partial sequence data, it was found that this rickettsia is sufficiently genetically distinct from other Rickettsia to be considered a distinct taxonomic entity. The isolation and culture of this organism, as well as comparative antigenic analysis, are required to ensure its conclusive taxonomic placement among spotted fever rickettsiae. The epidemiologic role of this new rickettsial agent and its possible pathogenicity to wild and domestic animals or humans is still unknown and needs to be investigated

QUALITY OF SERVICE OF SMALL HARDWARE COMPANIES IN A NORTHERN PERUVIAN PROVINCE

Currently, the quality of service provided by companies plays a fundamental role as a strategy to meet customer expectations and achieve customer satisfaction. The objective of the study was to identify the customers' perception of the quality of service provided by companies in the hardware sector in the province of Tumbes. In the methodology, the approach was quantitative, descriptive level and non-experimental design. The sample consisted of 487 clients of 10 companies that sell construction products. A questionnaire was adapted as a data collection instrument to evaluate the quality of service in a service company. The results showed that high levels of service quality prevailed with 72.48%, followed by medium with 25.87% and low with 1.64%. High levels of service quality were also found according to the sociodemographic variables sex, age and marital status. It is concluded that the majority of the clients considered the quality of service of the small hardware companies to be high, while only a small percentage considered the quality of service to be low

A GLOBAL ANALYSIS OF THE INFLUENCE OF GOVERNANCE ON IMPROVING TOURISM COMPETITIVENESS

Objective: The objective of the study was to identify the influence of governance on tourism competitiveness as measured by tourism GDP per capita, using structural equation modeling.Methodology: The study was descriptive correlational and applied quantitative documentary approach. Data from secondary sources from the World Bank and The World Travel & Tourism were used to obtain measures of governance and tourism GDP for 172 countries during the year 2021.Results: Governance was found to have a significant influence on tourism competitiveness, with government effectiveness, regulatory quality and rule of law emerging as the main predictors of governance. It was also found that most countries with high tourism performance have good governance, especially those countries that are small and specialized in tourism. Developed countries enjoy a high governance index, but do not lead the ranking in tourism GDP per capita.  Countries with low tourism performance have poor governance.Conclusions: Governance is a crucial factor in the success or failure of the tourism sector, and the positive and significant relationship between governance and tourism competitiveness has important implications for the formulation of policies and strategies to promote sustainable tourism development