Changes in the herbaceous and vine communities at the Bisley Experimental Watersheds, Puerto Rico, following Hurricane Hugo

1999 ◽  
Vol 29 (9) ◽  
pp. 1433-1437 ◽  
Author(s):  
Jesus D Chinea
Keyword(s):  
Puerto Rico ◽  
Permanent Plots ◽  
Closed Forest ◽  
Minor Portion ◽  
Abundance And Diversity ◽  
Tree Component ◽  
One Year ◽  
A Minor ◽  
Hurricane Hugo ◽  
Experimental Watersheds

While herbaceous species and vines constitute a minor portion of the biomass in tropical closed forest ecosystems, they account for a substantial portion of the diversity of these ecosystems and become more conspicuous after natural disturbances. This study describes the changes in abundance and diversity of the herbs and vines during 5 years following Hurricane Hugo at the Bisley Experimental Watersheds, Puerto Rico. The cover of herbs, ferns, and vine species was sampled within a 5-m2 area in 25 randomly chosen circular permanent plots within the 13 ha of these watersheds. Sampling was done 12, 18, 36, 48, and 60 months after the hurricane. One year after the hurricane the overall mean herbaceous cover in the watersheds was 55%. Four years later, the cover and species richness of herbs and vines, but not ferns, had been significantly reduced. The only change in species diversity (H') was a significant increase in ferns. These changes are explained in terms of the extent and spatial variability of the hurricane damage, as well as changes in the tree component of this ecosystem.

scholarly journals The Fate of Diesel Fuel Spilled by the Bahia Paraiso in Arthur Harbor, Antarctica

1991 ◽  
Vol 1991 (1) ◽  
pp. 493-500
Author(s):  
Mahlon C. Kennicutt ◽  
Stephen T. Sweet ◽  
William R. Fraser ◽  
Mary Culver ◽  
William L. Stockton
Keyword(s):  
Aromatic Hydrocarbons ◽  
Diesel Fuel ◽  
Dry Weight ◽  
High Energy ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Microbial Oxidation ◽  
Energy Environment ◽  
Minor Portion ◽  
One Year ◽  
A Minor

ABSTRACT The Bahia Paraiso spilled an estimated 600,000 liters of refined product (diesel fuel arctic, DFA) into Arthur Harbor, Antarctica, in January 1989. Water, organisms, and sediments within a two-mile radius of the wreck were contaminated to various degrees for at least one year after the spill. The DFA contained about one percent toxic aromatic hydrocarbons, including naphthalenes, fluorenes, and phenanthrenes. Intertidal areas were most directly affected, but all components of the harbor ecosystem were contaminated during the first few weeks of the spill. DFA was detected in tissues from birds, limpets, macroalgae, clams, and bottom feeding fish as well as water and sediments collected over a six-week period. During the most intense phase of the spill, total polynuclear aromatic hydrocarbons reached levels as high as 125,147 and 1,723 ppb (dry weight) in limpet tissues and sediments, respectively. The high-energy environment, the relatively small volume of material released, and the volatility of the refined product helped to limit toxic effects over time and space. Most of the spilled material evaporated, and the rest was diluted and swept from the area by winds and currents. Sedimentation, biological uptake, microbial oxidation, and photo-oxidation accounted for removal of only a minor portion of the spill.

In Memoriam

PEDIATRICS ◽  
1950 ◽  
Vol 5 (4) ◽  
pp. 764-764
Author(s):  
E. B. SHAW
Keyword(s):  
Alma Mater ◽  
City Hospital ◽  
Professional Career ◽  
Contagious Diseases ◽  
School Of Medicine ◽  
In Memoriam ◽  
One Year ◽  
A Minor ◽  
Associate Director ◽  
Western Reserve

JOHN TOOMEY died January 1, 1950. Born May 25, 1889, his preliminary education was in law, in which he received the degree of LL.B. and he practiced law for one year. Forsaking law for medicine, he entered medical school and received his medical degree from Western Reserve University in 1919. His entire professional career was devoted to the service of his Alma Mater where, beginning in a minor capacity, he had steadily increasing responsibilities to be finally Professor of Clinical Pediatrics and Contagious Diseases, Western Reserve University School of Medicine, and Associate Director of Pediatrics and Contagious Diseases and Associate Director in the Department of Pediatrics, Out Patient Department, City Hospital of Cleveland.

scholarly journals Studying the present-day dynamics of Lena delta by space images

2019 ◽  
Vol 46 (6) ◽  
pp. 567-574
Author(s):  
V. I. Kravtsova ◽  
A. N. Inyushin
Keyword(s):  
Marine Terrace ◽  
Southwestern Part ◽  
Space Images ◽  
Delta Coastline ◽  
Local Erosion ◽  
Minor Portion ◽  
Landsat Satellite ◽  
A Minor ◽  
Erosion Material ◽  
Lena Delta

The dynamics of Lena delta coastline since the late XX century up to the present time have been studied using Landsat satellite data. The comparison of different-time images of morphologically different segments of the delta coastline has shown the major portion of the delta to be stable. Minimal changes have been recorded near the mouths of the branches carrying a minor portion of the Lena runoffthe Olenekskaya and Tumatskie. In the eastern part of the delta, near the mouths of copious branches Trofimovskaya and Bykovskaya, no changes have taken place, as well as in its western part, which is represented by a part of abrasion marine terrace embraced by the delta. In the southwestern part, in the Olenek delta, the delta coastline has been eroded with the erosion material transported eastward by along-shore current. Near the mouths of the Tumatskaya branch, the forms of marine accumulation are unstable, and the marine terrace in the northeastern part of the delta shows a minor local erosion. The periods of erosion in different delta areas are not synchronous and the eroded zones are not large in size. No increment in the land, nor shore progradation have been seen.

scholarly journals A contribution to the study of biology of Curculio elephas Gyll. (Coleoptera, Curculionidae)

2011 ◽  
pp. 19-28
Author(s):  
Milan Drekic ◽  
Ljubodrag Mihajlovic
Keyword(s):  
Life Cycle ◽  
Larval Stage ◽  
Seed Orchard ◽  
Egg Laying ◽  
Pedunculate Oak ◽  
Minor Part ◽  
One Year ◽  
Entomological Laboratory ◽  
A Minor ◽  
Curculio Elephas

One of the insects that feeds on pedunculate oak acorns and reduces its seed yield is Curculio elephas Gyll. The study of Curculio elephas Gyll is necessary because of the severe damages caused by this insect and also owing to its insufficiently investigated biology. The research was conducted in the common oak seed orchard at Banov Brod, forest estate ?Sremska Mitrovica?, and in the entomological laboratory. The adults emerge from the soil chambers from mid July till the beginning of September. The presence of adults, as determined by crown fogging, ranged from the end of July till the beginning of September with the highest number in mid August. After emerging from the soil, females are already fertile with the developed eggs in the ovaries. They start egg laying after 1 to 8 days and they lay from one to seven eggs per day. Egg laying period lasts from 7 to 20 days. Fertility of C. elephas females ranges from 5 to 40 eggs, while their fecundity ranges from 19 to 45 eggs. At the end of the larval stage, larvae bore into the soil and stay there from one to three years. The species hibernates only in the larval stage. C. elephas has a one-year life cycle, while a minor part of the population has a two or three-year life cycle.

scholarly journals Simultaneous occurrence of brain tumor and myeloradiculopathy in schistosomiasis mansoni: case report

2009 ◽  
Vol 42 (3) ◽  
pp. 338-341 ◽  
Author(s):  
José Roberto Lambertucci ◽  
Silvio Roberto Souza-Pereira ◽  
Tânia Antunes Carvalho
Keyword(s):  
Puerto Rico ◽  
Brain Tumor ◽  
Brain Biopsy ◽  
The United States ◽  
Clinical State ◽  
Simultaneous Occurrence ◽  
Resonance Imaging ◽  
Schistosomiasis Mansoni ◽  
One Year ◽  
The Brain

Simultaneous occurrence of brain tumor and myeloradiculopathy in cases of Manson's schistosomiasis have only rarely been described. We report the case of a 38-year-old man who developed seizures during a trip to Puerto Rico and in whom a brain tumor was diagnosed by magnetic resonance imaging: brain biopsy revealed the diagnosis of schistosomiasis. He was transferred to a hospital in the United States and, during hospitalization, he developed sudden paraplegia. The diagnosis of myeloradiculopathy was confirmed at that time. He was administered praziquantel and steroids. The brain tumor disappeared, but the patient was left with paraplegia and fecal and urinary dysfunction. He has now been followed up in Brazil for one year, and his clinical state, imaging examinations and laboratory tests are presented here.

scholarly journals Local changes in communities of wild bees (Hymenoptera: Apoidea, Apiformes): 30 years later

2014 ◽  
Vol 83 (4) ◽  
pp. 325-351 ◽  
Author(s):  
Józef Banaszak ◽  
Halina Ratyńska
Keyword(s):  
Agricultural Landscape ◽  
Plant Succession ◽  
Permanent Plots ◽  
Wild Bees ◽  
Natural Habitats ◽  
Increasing Trend ◽  
Quantitative Changes ◽  
Abundance And Diversity ◽  
Bee Communities ◽  
Forest Habitats

ABSTRACT Changes in communities of wild bees (Apiformes) were studied in relation to changes in vegetation in six permanent plots (natural forest habitats in the Wielkopolska National Park, and semi-natural habitats in the agricultural landscape near Turew) at the end of four decades (starting from the late 1970s). In 2008-2010, as many as 100 species of Apiformes were recorded there, which is more than reported in earlier decades. The most stable bee communities were those in forest habitats (oak-hornbeam forest, oak forest). Substantial qualitative and quantitative changes in vegetation and bee communities were recorded only after the renaturalisation of a former xerothermic grassland, which had become overgrown with shrubs and trees as a result of plant succession. Human interference (e.g. the felling of some trees growing along a road, clearance of understorey shrubs, ploughing of roadside margins) at selected refuge habitats in the agricultural landscape led to short-term fluctuations in bee abundance and diversity, but an increasing trend in abundance was noted.

Quantitative Histochemical Analysis of Starch, Malate and K+, together with the Activity of Phospho-enolpyruvate Carboxylase along an Elongating Primary Leaf of Hordeum vulgare

1987 ◽  
Vol 42 (9-10) ◽  
pp. 1092-1096 ◽  
Author(s):  
R. Hampp ◽  
W. H. Outlaw ◽  
H. Ziegler
Keyword(s):  
Starch Content ◽  
Solute Concentration ◽  
Leaf Base ◽  
Histochemical Analysis ◽  
Specific Nature ◽  
Mesophyll Cells ◽  
Equivalent Basis ◽  
Intercalary Meristem ◽  
Minor Portion ◽  
A Minor

The content of starch, malate, potassium and the activity of phospho-enolpyruvate carboxylase (PEPC) were analyzed by quantitative histochemistry in mesophyll cells of different zones along the axis of lyophylized primary elongating leaves of barley. The concentrations of potassium and malate were low in the region of the intercalary meristem (close to the point of grain attachment), but concentrations of solutes increased abruptly and stoichiometrically (equivalent basis) in the elongation zone (2 to 10 mm from the leaf base), where they contributed approximately -0.17 megapascal to the solute potential. Although this solute concentration represents only a minor portion of the reported solute potential, the specific nature of the change, its correlation with a decrease of starch content, and the distribution of the activity of PEPC indicate cell expansion in barley could be augmented by a potassium malate osmoregulatory system that utilizes starch as a source of carbon skeletons.

Compensatory effect of the heat increment of feeding on thermoregulation costs of white-tailed deer fawns in winter

1999 ◽  
Vol 77 (9) ◽  
pp. 1474-1485 ◽  
Author(s):  
Paul G Jensen ◽  
Peter J Pekins ◽  
James B Holter
Keyword(s):  
Metabolic Rate ◽  
Heat Production ◽  
Resting Metabolic Rate ◽  
Energetic Cost ◽  
Critical Temperatures ◽  
Metabolic Chamber ◽  
Heat Increment Of Feeding ◽  
Heat Increment ◽  
Minor Portion ◽  
A Minor

For northern white-tailed deer (Odocoileus virginianus) fawns, the energetic cost of thermoregulation (HcE) during severe winters can result in substantial catabolism of body-tissue reserves. The heat increment of feeding (HiE) has the potential to offset thermoregulatory energy expenditure that would otherwise require the catabolism of these reserves. During winters 1996 and 1997, we conducted 18 fasting and 18 on-feed heat-production trials using indirect respiration calorimetry in a metabolic chamber. Nonlinear regression analysis was used to estimate the lower critical temperatures (Tlc) and determine the fasting metabolic rate (FMR) and resting metabolic rate (RMR). Resulting models were used to calculate HiE, HcE, and percent substitution of HiE for HcE. For fawns fed a natural browse diet, estimated FMR and RMR were 352 and 490 kJ·kg body mass (BM)-0.75·d-1, respectively; this 40% increase in thermoneutral heat production reduced Tlc from -0.8 to -11.2°C between the fasted and fed states, respectively, and reduced HcE by 59% for fed fawns. For fawns fed a concentrate diet, estimated FMR and RMR were 377 and 573 kJ·kg BM-0.75·d-1, respectively. Level of browse intake had a significant effect on RMR andTlc. RMR was 12% higher for fawns on a high versus a low level of intake, and estimated Tlc was -15.6 and -5.8°C, respectively. Our data indicate that the energetic cost of thermoregulation is probably a minor portion of the energy budget of a healthy fawn consuming natural forage.

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