Herrick J.E.,Research Soil Scientist |
Karl J.W.,U.S. Department of Agriculture |
Boos J.,Us Agency For International Development |
Johnson M.-V.V.,U.S. Department of Agriculture |
And 13 more authors.
Journal of Soil and Water Conservation | Year: 2013
The rapid expansion of internet accessibility through mobile phone networks together with simple mobile applications and expert knowledge systems provide new opportunities to connect farmers, extension and development workers, and policymakers with site-specific knowledge and information. The amount of electronically available knowledge and information about land potential, including resilience, is also rapidly increasing through the efforts of a number of organizations throughout the world. The proposed Land-Potential Knowledge System will leverage these emerging trends to connect land managers committed to sustainable land management with the most relevant and up-to-date knowledge and information available.
Hruby F.,National Commission for Knowledge and Use of Biodiversity CONABIO |
Melamed S.,PCI Geomatics |
Ressl R.,National Commission for Knowledge and Use of Biodiversity CONABIO |
Stanley D.,PCI Geomatics
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2016
The project presented in this article is to create a completely seamless and cloud-free mosaic of Mexico at a resolution of 5m, using approximately 4,500 RapidEye images. To complete this project in a timely manner and with limited operators, a number of processing architectures were required to handle a data volume of 12 terabytes. This paper will discuss the different operations realized to complete this project, which include, preprocessing, mosaic generation and post mosaic editing. Prior to mosaic generation, it was necessary to filter the 50,000 RapidEye images captured over Mexico between 2011 and 2014 to identify the top candidate images, based on season and cloud cover. Upon selecting the top candidate images, PCI Geomatics' GXL system was used to reproject, color balance and generate seamlines for the output 1TB+ mosaic. This paper will also discuss innovative techniques used by the GXL for color balancing large volumes of imagery with substantial radiometric differences. Furthermore, post-mosaicking steps, such as, exposure correction, cloud and cloud shadow elimination will be presented.
Smith M.J.,Microsoft |
Benitez-Diaz H.,National Commission for Knowledge and Use of Biodiversity CONABIO |
Clemente-Munoz M.T.,University of Cordoba, Spain |
Donaldson J.,South African National Biodiversity Institute |
And 8 more authors.
Biological Conservation | Year: 2011
The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) came into effect in 1975 to protect certain species of wild fauna and flora against over-exploitation through international trade. Determining which trade is detrimental to the survival of species in the wild can be a major difficulty in the implementation of CITES by national authorities, partly due to limited knowledge and understanding of the species' biology, management, and the impacts of harvesting. Some of this knowledge could be acquired through targeted scientific research. However, to date there exists no general overview of the current use of biological information in determining detriment in CITES to help scientists identify research priorities. For an international meeting in 2008, over 100 scientists and regulators compiled 60 case studies covering a wide range of CITES-listed taxa, outlining how information on the biology, harvesting and management might be used to determine whether international trade is detrimental. We used these case studies, workshop conclusions, and other published literature, to identify 10 potential research directions for the scientific community which, if addressed, could greatly assist in the making of Non-Detriment Findings. We hope that this will encourage more scientists to study CITES-listed species, and foster more collaboration between research scientists, CITES national authorities, CITES technical committees and local communities. The case studies highlight a general need for advice on how to identify and manage levels of risk involved when assessing possible detriment, and for advice on assessing detriment under complex harvesting scenarios such as when multiple species, or parts of individuals, are harvested. Broadly, they highlight an opportunity for scientists to further develop a body of scientific studies that propose, refine and adapt methods for assessing detrimental trade in CITES-listed taxa. Comparisons within life-form groups indicated the potential for the identification of practical advice that could apply to groups of taxa. The case studies highlighted a widespread need for more information gathering studies of CITES-listed taxa such as the broader impacts of harvesting on populations and ecosystems, and the potential long-term evolutionary impacts. The case studies also highlighted the need for practical advice on how to implement adaptive management programmes and for research into enterprises based on the harvesting of CITES-listed species from the wild. © 2010 Elsevier Ltd.
Turk D.,Dalhousie University |
Turk D.,Columbia University |
Yates K.K.,U.S. Geological Survey |
Vega-Rodriguez M.,University of South Florida |
And 10 more authors.
Marine Ecology Progress Series | Year: 2015
Diurnal variation of net community production (NEP) and net community calcification (NEC) were measured in coral reef and seagrass biomes during October 2012 in the lower Florida Keys using a mesocosm enclosure and the oxygen gradient flux technique. Seagrass and coral reef sites showed diurnal variations of NEP and NEC, with positive values at near-seafloor light levels >100-300 μ Einstein m-2 s-1. During daylight hours, we detected an average NEP of 12.3 and 8.6 mmol O2 m-2 h-1 at the seagrass and coral reef site, respectively. At night, NEP at the seagrass site was relatively constant, while on the coral reef, net respiration was highest immediately after dusk and decreased during the rest of the night. At the seagrass site, NEC values ranged from 0.20 g CaCO3 m-2 h-1 during daylight to-0.15 g CaCO3 m-2 h-1 at night, and from 0.17 to-0.10 g CaCO3 m-2 h-1 at the coral reef site. There were no significant differences in pH and aragonite saturation states (Oar) between the seagrass and coral reef sites. Decrease in light levels during thunderstorms significantly decreased NEP, transforming the system from net autotrophic to net heterotrophic. © 2015 Inter-Research.
Toro-Farmer G.,University of South Florida |
Muller-Karger F.E.,University of South Florida |
Vega-Rodriguez M.,University of South Florida |
Melo N.,Florida International University |
And 3 more authors.
Remote Sensing | Year: 2016
Light availability is an important factor driving primary productivity in benthic ecosystems, but in situ and remote sensing measurements of light quality are limited for coral reefs and seagrass beds. We evaluated the productivity responses of a patch reef and a seagrass site in the Lower Florida Keys to ambient light availability and spectral quality. In situ optical properties were characterized utilizing moored and water column bio-optical and hydrographic measurements. Net ecosystem productivity (NEP) was also estimated for these study sites using benthic productivity chambers. Our results show higher spectral light attenuation and absorption, and lower irradiance during low tide in the patch reef, tracking the influx of materials from shallower coastal areas. In contrast, the intrusion of clearer surface Atlantic Ocean water caused lower values of spectral attenuation and absorption, and higher irradiance in the patch reef during high tide. Storms during the studied period, with winds >10 m. s-1, caused higher spectral attenuation values. A spatial gradient of NEP was observed, from high productivity in the shallow seagrass area, to lower productivity in deeper patch reefs. The highest daytime NEP was observed in the seagrass, with values of almost 0.4 g.O2.m-2. h-1. Productivity at the patch reef area was lower in May than during October 2012 (mean = 0.137 and 0.177 g.O2.m-2. h-1, respectively). Higher photosynthetic active radiation (PAR) levels measured above water and lower light attenuation in the red region of the visible spectrum (~666 to ~699 nm) had a positive correlation with NEP. Our results indicate that changes in light availability and quality by suspended or resuspended particles limit benthic productivity in the Florida Keys. © 2016 by the authors.
Valderrama L.,National Commission for Knowledge and Use of Biodiversity CONABIO |
Troche C.,National Commission for Knowledge and Use of Biodiversity CONABIO |
Rodriguez M.T.,National Commission for Knowledge and Use of Biodiversity CONABIO |
Marquez D.,National Commission for Knowledge and Use of Biodiversity CONABIO |
And 5 more authors.
Wetlands | Year: 2014
Our objective was to evaluate the changes of mangrove forest coverage of Mexico and adjacent land cover types in the coastal zone between 1970 and 2005 by remote sensing techniques. Based on maps generated by the National Commission for the Knowledge and Use of Biodiversity (CONABIO for its Spanish acronym), three land cover change indicators were estimated: net change, stability of location, and stability of residence. Analyses were made at national and regional (Northern Pacific, Central Pacific, Southern Pacific, Gulf of Mexico, and Yucatan Peninsula) scales, and for the 17 states presenting mangroves. At the national level during the studied period we observed a 10 % net loss of mangrove. At the state level, 13 states lost area, three gained area, and one showed no change in mangrove cover. According to the indicators of location stability and residence stability, the lowest values were recorded in four states within the Pacific Ocean coast (Jalisco, Colima, Guerrero, and Oaxaca), while the highest values corresponded to two states of the Gulf of Mexico (Tamaulipas and Tabasco). Many of the changes in mangrove cover we detected were attributed to crop and animal husbandry activities, and to anthropic infrastructure. © 2014 Society of Wetland Scientists.
Hruby F.,National Commission for Knowledge and Use of Biodiversity CONABIO
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2015
Since their appearance two centuries ago, choropleth maps have become the most widely used map type for quantitative thematic cartography. Basic principle is the – typically classified – aggregation of data over regions previously defined (e.g. administration districts, distribution areas, etc.). While usually just a single aspect of a single variable is being visualized, a few special forms can be distinguished, e.g. unclassified or bivariate choropleth maps. The latter, being used to depict geographical relationship, will be the focus of this article. Based on a quick review on choropleth mapping, we will dwell on bivariate choropleth mapping both from a theoreticalempirical and practical-constructional perspective. Against this background, we shall show by means of a series of exemplary applications, how bivariate choropleth mapping is increasingly applied in a multidisciplinary field of research. © SGEM2015.