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Three-dimensionally integrated trace fossils from shallow-marine deposits in the Lower Cretaceous of the Neuquen Basin (Argentina) : Hillichnus agrioensis isp. nov.

100%

Pazos P. , Fernandez D.

Acta Geologica Polonica

2010

tom Vol. 60, no. 1

105-118

A complex trace fossil that requires a three-dimensional (3D) reconstruction is described and interpreted. The specimens studied are assigned to a new ichnospecies (Hillichnus agrioensis) of Hillichnus Bromley et al., 2003. Most of them are uncollectable and a compound iconotype was designed to characterise the new ichnospecies. The three-dimensional trace fossil has been recorded in marginal-marine deposits close to the top of the Agrio Formation (Lower Cretaceous of Neuquen Basin, Argentina). The new ichnospecies shows a different pattern of feeding than H. lobosensis Bromley et al., 2003, and records defaecation downward in the deeper preservational level (level 4). Feather-like structures (level 2) that typify the ichnogenus also record the activity of an inhalant siphon and indicate a retractile movement. The vertical shafts (level 1) are scarcely recorded. Aligned double rings also document the infaunal habit of the tellinid bivalves that are considered the most likely producers of the trace. It is clear that when only level 2 is exposed, in some cases this form can be assigned to Jamesonichnites heinbergi Dam 1990a consequently, this ichnospecies is interconnected with more than one ichnogenus. Vertical projections recorded in branches differ from the type ichnospecies H. lobosensis Bromley et al., 2003. The occurrence in marginal-marine facies is congruent with the record of Jamesonichnites but not common in the type species and similar to those more frequent in deep-sea deposits (e.g. Polykampton alpinum Ooster, 1869).

Novel insights about coffee leaf rust interactions: identification of genes involved in the resistance process

51%

Santos P. , Machado E. , Gouveia M. M. , Bon M. C. , Agostini C. , Petitot A. S. , Silva M. C. , Guerra-Guimaraes L. , Ribeiro A. , Fernandez D.

Acta Physiologiae Plantarum

2004

tom 26

nr 3 suppl.

Quercus pollen season dynamics in the Iberian Peninsula: response to meteorological parameters and possible consequences of climate change

41%

Garcia-Mozo H. , Galan C. , Jato V. , Belmonte J. , Diaz de la Guardia C. , Fernandez D. , Gutierrez M. , Aira M. J. , Roure J. M. , Ruiz L. , Trigo M. M. , Dominguez-Vilches E.

Annals of Agricultural and Environmental Medicine

2006

tom 13

nr 2

The main characteristics of the Quercus pollination season were studied in 14 different localities of the Iberian Peninsula from 1992-2004. Results show that Quercus flowering season has tended to start earlier in recent years, probably due to the increased temperatures in the pre-flowering period, detected at study sites over the second half of the 20th century. A Growing Degree Days forecasting model was used, together with future meteorological data forecast using the Regional Climate Model developed by the Hadley Meteorological Centre, in order to determine the expected advance in the start of Quercus pollination in future years. At each study site, airborne pollen curves presented a similar pattern in all study years, with different peaks over the season attributable in many cases to the presence of several species. High pollen concentrations were recorded, particularly at Mediterranean sites. This study also proposes forecasting models to predict both daily pollen values and annual pollen emission. All models were externally validated using data for 2001 and 2004, with acceptable results. Finally, the impact of the highly-likely climate change on Iberian Quercus pollen concentration values was studied by applying RCM meteorological data for different future years, 2025, 2050, 2075 and 2099. Results indicate that under a doubled CO2 scenario at the end of the 21st century Quercus pollination season could start on average one month earlier and airborne pollen concentrations will increase by 50% with respect to current levels, with higher values in Mediterranean inland areas.