Macrosystem community assembly patterns are predicted by foundation tree species genetic connectivity and environment across the American Southwest

Macrosystems ecology is an emerging science that aims to integrate traditionally distinct disciplines to predict how hierarchical interacting processes influence the emergence of complex patterns across local to regional and global scales. Despite increased focus on cross-scale relationships and cross-disciplinary integration, few macroecology studies incorporate genetic-based processes. Here we used a community genetics approach to investigate the pattern-process relationships underlying the emergence of macroscale biodiversity patterns. We tested the hypothesis that environmental variation, geography, and genetic connectivity in a foundation tree species differentially predict associated community assembly patterns from local to continental scales. Using genome-wide SNP data, we assessed genetic connectivity as a function of genetic similarity and structure in Fremont cottonwood (Populus fremontii) across its distribution throughout the southwestern US and México. For the same trees, we measured community composition, diversity, and abundance of leaf modifying arthropods and sequenced targeted amplicons of twig fungal endophytes. Five key findings emerged. (1) We identified three primary and six secondary population genetic groups within P. fremontii, which occupy distinct climate niches. (2) Both the leaf modifying arthropod and fungal endophyte communities were significantly differentiated across host tree ecotypes, with genetic distance among sampling locations explaining 13-17% of respective macroscale community structure. (3) For arthropods, environmental distance was the strongest driver of community similarity. (4) Conversely, host genetic connectivity was the most important contributor to macroscale endophyte community structure, with no significant contribution of environmental distance. (5) Furthermore, we observed a shift in the strength of interspecific relationships, with host genetics most strongly influencing associated communities at the intermediate population scale. Our findings suggest that genetic connectivity and environmental variation play integrated roles in macroscale community assembly, and their relative importance changes with scale. Thus, conservation genetic management of the diversity harbored within foundation species is vital for sustaining associated regional biodiversity.

Occurrence of Congenital Anomalies in Iran and Implications of Osr-o-Haraj "Denegation of Intolerable Hardship Rule" in Shia Fiqh

Background and Objectives: The aim of this study was to explain the examples of "the Jurisprudential Rule of "Osr o- Haraj" or Denegation of Intolerable Hardship in the occurrence of congenital anomalies and genetic disorders and show that according to the current laws of the country, more of these diseases can be prevented. Material and Methods: Data for occurrence of congenital anomalies were derived from two major regional and national epidemiological studies based on 6,465,849 births in the country. A comprehensive review of literature was carried out on the details of ‘Denegation of Intolerable Hardship Rule. The details of medical termination of pregnancies diagnosed for congenital anomalies and the role of ‘Denegation of Intolerable Hardship’ principle in the prevention of birth defects were explored in several Focused Group Discussions formed by peditricians, geneticists, psychiatrists, neotatalogists and expert jurisprudents. Results: The statistical estimates indicate that there are now nearly 100,000 births with one of the birth defects occurring every year in Iran. The total prevalence of the anomalies has more than tripled in the last 18 years. Conclusion: The occurrence of congenital anomalies and genetic disorders will undermine the gene pool of the population if preventive measures are not properly implemented in the community genetics services to control those disorders. According to the current law on therapeutic abortion, disorders that lead to the hardships of father, mother, family, community, as well as future generations may be diagnosed by the three specialists (before the 16th week of pregnancy, the time of onsetting the soul). They can then be referred for medical abortion. A minimum of 70,000 birth defects may be avoided using the therapeutic termination of pregnancies diagnosed for congenital anomalies if the ‘no hardship and negation of distress and constriction’ principle is suitably explored in maternal, pediatric, neonatal settings and for public health authorities.

Growing up aspen: ontogeny and trade-offs shape growth, defence and reproduction in a foundation species

Background and Aims Intraspecific variation in foundation species of forest ecosystems can shape community and ecosystem properties, particularly when that variation has a genetic basis. Traits mediating interactions with other species are predicted by simple allocation models to follow ontogenetic patterns that are rarely studied in trees. The aim of this research was to identify the roles of genotype, ontogeny and genotypic trade-offs shaping growth, defence and reproduction in aspen. Methods We established a common garden replicating >500 aspen genets in Wisconsin, USA. Trees were measured through the juvenile period into the onset of reproduction, for growth, defence chemistry (phenolic glycosides and condensed tannins), nitrogen, extrafloral nectaries, leaf morphology (specific leaf area), flower production and foliar herbivory and disease. We also assayed the TOZ19 sex marker and heterozygosity at ten microsatellite loci. Key Results We found high levels of genotypic variation for all traits, and high heritabilities for both the traits and their ontogenetic trajectories. Ontogeny strongly shaped intraspecific variation, and trade-offs among growth, defence and reproduction supported some predictions while contradicting others. Both direct resistance (chemical defence) and indirect defence (extrafloral nectaries) declined during the juvenile stage, prior to the onset of reproduction. Reproduction was higher in trees that were larger, male and had higher individual heterozygosity. Growth was diminished by genotypic allocation to both direct and indirect defence as well as to reproduction, but we found no evidence of trade-offs between defence and reproduction. Conclusions Key traits affecting the ecological communities of aspen have high levels of genotypic variation and heritability, strong patterns of ontogeny and clear trade-offs among growth, defence and reproduction. The architecture of aspen’s community genetics – its ontogeny, trade-offs and especially its great variability – is shaped by both its broad range and the diverse community of associates, and in turn further fosters that diversity.