Hocine Himrane - Academia.edu (original) (raw)

Papers by Hocine Himrane

Research paper thumbnail of A contribution to the study of the germination and conservation of Argania spinosa (L.) Skeels seeds in Tindouf area (Algeria)

HAL (Le Centre pour la Communication Scientifique Directe), 2018

Research paper thumbnail of Contribution à l’étude de la germination et de la conservation des graines d’Argania spinosa (L.) Skeels de la région de Tindouf (Algérie)

Research paper thumbnail of Morphological and germination capacity of Argania spinosa’s (L) Skeels of Algeria South-West population: variability of fruit and stone morphotypes

Forest Systems, 2019

Aim of study: The purpose of our study is the highlighting of phenotypic variability within the n... more Aim of study: The purpose of our study is the highlighting of phenotypic variability within the natural population of Argania spinosa (L.) Skeels by morphological characterization of fruits and stones and by evaluation germination capacity of stones.Area of study: The Argan tree stand is located in southwest of Algeria (Tindouf).Material and Methods: The fruits were collected on a sample of 30 mother trees for three consecutive years. We carried out the morpho-biometric characterization (shapes, dimensions and weight) of thirty fruits and thirty stones from each mother-tree, and assessed the germination capacity of the different morphotypes.Main results: We found high variability of morphological characters of fruits and stones between trees. Five fruits shapes (oval, avoid, rounded, spherical and very spherical) and three different stones shapes (oval, avoid and spherical) were identified in mother-trees. The rounded, spherical and very spherical shapes of fruits are the most abund...

Research paper thumbnail of Quarantining the Sahara desert: growth and water-use efficiency of Aleppo pine in the Algerian Green Barrier

European Journal of Forest Research, 2016

Manuscript Click here to download Manuscript Choury et al. main text.docx Click here to view link... more Manuscript Click here to download Manuscript Choury et al. main text.docx Click here to view linked References 24 We acknowledge the support of the International Atomic Energy Agency (project 25

Research paper thumbnail of Morphological and ecophysiological variation of the hybrid oak Quercus subpyrenaica (Q. faginea � Q. pubescens)

Research paper thumbnail of Growth and biomass distribution of cherrybark oak (Quercus pagoda Raf.) seedlings as influenced by light availability

Forest Ecology and Management, 1998

Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under fo... more Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under four light levels (100%. 53%. 27% or 8% of full sunlight) to study the effects of light availability on their shoot growth, biomass accumulation, and biomass distribution. After two growing seasons, greatest stem growth was observed on seedlings which received intermediate light levels, and this growth was associated to a greater accumulation of total seedling biomass and a distribution pattern which balanced accumulation of root and shoot biomass. In contrast, less biomass accumulation and a biomass distribution pattern that favored root growth over stem growth were characteristic of seedlings receiving full sunlight. These results suggest that regeneration of cherrybark oak on mesic sites may be limited by preferential root growth, but reproduction of this species may be amenable to silvicultural practices that improve the light environment through stand manipulation. Published by Elsevier Science B.V. All rights reserved.

Research paper thumbnail of Supreme Court Endorses Broad ERISA Preemption of Pure Eligibility Determinations by Plan Administrator; Federal Court the Exclusive Forum for Such Claims; Overlapping State Law Causes of Action Not Permitted

Journal of Risk and Insurance, 2004

Aetna Health, Inc. v. Davila, 124 S. Ct. 2488, 159 L.Ed. 2d 312, 72 U.S.L.W. 4516, 2004 U.S. LEXI... more Aetna Health, Inc. v. Davila, 124 S. Ct. 2488, 159 L.Ed. 2d 312, 72 U.S.L.W. 4516, 2004 U.S. LEXIS 4571 (United States Supreme Court--March 23, 2004) Juan Davila was a participant in an employer-provided benefit plan subject to ERISA (the Employee Retirement Income Security Act of 1974) and Ruby Calad was a beneficiary under another such plan. Under the terms of Davila's plan, administered by Aetna Health, Inc. (formerly Aetna U.S. Healthcare), requests for coverage and payment to health-care providers are reviewed by Aetna. Cigna Healthcare of Texas provided similar administration of Calad's plan. Davila experienced arthritis pain. His treating physician prescribed Vioxx. Aetna refused to pay for reasons not stated in the Court's opinion but presumably because Vioxx was not a prescription medication included in the plan's coverage for arthritis. Davila did not contest or appeal this decision and did not buy Vioxx on his own. Instead, he purchased Naprosyn, "fro...

Research paper thumbnail of Growth and biomass distribution of cherrybark oak ( Quercus pagoda Raf.) seedlings as influenced by light availability

Forest Ecology and Management, 1998

Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under fo... more Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under four light levels (100%.

Research paper thumbnail of Morphological indicators of stock quality and field performance of red oak (Quercus rubra L.) seedlings underplanted in a central Ontario shelterwood

New Forests, 1997

The value of initial stem diameter near the root collar, shoot length and number of first-order l... more The value of initial stem diameter near the root collar, shoot length and number of first-order lateral roots (FOLR) as morphological indicators of stock quality and field performance was examined for bareroot (1+0, undercut) red oak (Quercus rubra L.) underplanted in a shelterwood in central Ontario. These three attributes were measured on more than 400 seedlings prior to planting, and their relationship with height and basal diameter growth two years after planting was determined using correlation and regression analysis. Initial diameter, shoot length and number of FOLR were positively and significantly correlated with second-year height and diameter. These relationships were strongest for diameter, but this variable explained less than 25% of the total variation in growth. Of the three indicators, diameter was also the best predictor of several physical characteristics of root systems two years after planting. Initial diameter was significantly correlated with root volume, root area and lateral root, taproot and total root dry mass. Weaker relationships existed between initial shoot length and number of FOLR and second-year root system features. Stem diameter two years after planting was more strongly related to root volume, area and dry mass than was initial diameter, the probable result of adjustment in root-shoot balance of planting stock to the shelterwood environment.

Research paper thumbnail of Morphological and ecophysiological variation of the hybrid oak Quercus subpyrenaica ( Q. faginea × Q. pubescens

Trees-structure and Function, 2004

Natural hybridization is common among oaks. We studied the variability of morphological and ecoph... more Natural hybridization is common among oaks. We studied the variability of morphological and ecophysiological variables in the hybrid Quercus subpyrenaica and its assumed parental species Q. faginea and Q. pubescens, which co-occur in NE Spain. To assess the fitness of these taxa we studied several ecophysiological variables (hydraulic conductivity, K h; hydraulic specific conductivity, K s; leaf specific conductivity, LSC; water potential corresponding to a 50% loss of conductivity, PLC50; efficiency of light absorption, E a). We performed a correspondence analysis (CA) to ordinate seedlings, grown under homogeneous environmental conditions, according to their plant and leaf morphology. The CA axis 1 synthesized intra-taxon variability, while the CA axis 2 summarized inter-taxa variability. Q. subpyrenaica showed a wide spectrum of forms, but they were overall closer to those of Q. faginea. We defined three phenotypes within the hybrid based on morphology, which were: (i) the robur group (Qs-r; auriculate leaf base, rounded lobe apex); (ii) Q. pubescens (Qs-p; rounded leaf base, acute lobe apex); and (iii) Q. faginea (Qs-f; acute leaf base, acute-spiny lobe apex). The mean values of K s and PLC50 arranged the hybrid groups in the same order as the ordination based on leaf morphology. The Qs-r group showed the highest values of K s and PLC50, while the Qs-f group showed the lowest. Both morphologically and ecophysiologically, the hybrids showed a wide range of values, which spanned and even exceeded the variation of parental taxa.

Research paper thumbnail of A contribution to the study of the germination and conservation of Argania spinosa (L.) Skeels seeds in Tindouf area (Algeria)

HAL (Le Centre pour la Communication Scientifique Directe), 2018

Research paper thumbnail of Contribution à l’étude de la germination et de la conservation des graines d’Argania spinosa (L.) Skeels de la région de Tindouf (Algérie)

Research paper thumbnail of Morphological and germination capacity of Argania spinosa’s (L) Skeels of Algeria South-West population: variability of fruit and stone morphotypes

Forest Systems, 2019

Aim of study: The purpose of our study is the highlighting of phenotypic variability within the n... more Aim of study: The purpose of our study is the highlighting of phenotypic variability within the natural population of Argania spinosa (L.) Skeels by morphological characterization of fruits and stones and by evaluation germination capacity of stones.Area of study: The Argan tree stand is located in southwest of Algeria (Tindouf).Material and Methods: The fruits were collected on a sample of 30 mother trees for three consecutive years. We carried out the morpho-biometric characterization (shapes, dimensions and weight) of thirty fruits and thirty stones from each mother-tree, and assessed the germination capacity of the different morphotypes.Main results: We found high variability of morphological characters of fruits and stones between trees. Five fruits shapes (oval, avoid, rounded, spherical and very spherical) and three different stones shapes (oval, avoid and spherical) were identified in mother-trees. The rounded, spherical and very spherical shapes of fruits are the most abund...

Research paper thumbnail of Quarantining the Sahara desert: growth and water-use efficiency of Aleppo pine in the Algerian Green Barrier

European Journal of Forest Research, 2016

Manuscript Click here to download Manuscript Choury et al. main text.docx Click here to view link... more Manuscript Click here to download Manuscript Choury et al. main text.docx Click here to view linked References 24 We acknowledge the support of the International Atomic Energy Agency (project 25

Research paper thumbnail of Morphological and ecophysiological variation of the hybrid oak Quercus subpyrenaica (Q. faginea � Q. pubescens)

Research paper thumbnail of Growth and biomass distribution of cherrybark oak (Quercus pagoda Raf.) seedlings as influenced by light availability

Forest Ecology and Management, 1998

Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under fo... more Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under four light levels (100%. 53%. 27% or 8% of full sunlight) to study the effects of light availability on their shoot growth, biomass accumulation, and biomass distribution. After two growing seasons, greatest stem growth was observed on seedlings which received intermediate light levels, and this growth was associated to a greater accumulation of total seedling biomass and a distribution pattern which balanced accumulation of root and shoot biomass. In contrast, less biomass accumulation and a biomass distribution pattern that favored root growth over stem growth were characteristic of seedlings receiving full sunlight. These results suggest that regeneration of cherrybark oak on mesic sites may be limited by preferential root growth, but reproduction of this species may be amenable to silvicultural practices that improve the light environment through stand manipulation. Published by Elsevier Science B.V. All rights reserved.

Research paper thumbnail of Supreme Court Endorses Broad ERISA Preemption of Pure Eligibility Determinations by Plan Administrator; Federal Court the Exclusive Forum for Such Claims; Overlapping State Law Causes of Action Not Permitted

Journal of Risk and Insurance, 2004

Aetna Health, Inc. v. Davila, 124 S. Ct. 2488, 159 L.Ed. 2d 312, 72 U.S.L.W. 4516, 2004 U.S. LEXI... more Aetna Health, Inc. v. Davila, 124 S. Ct. 2488, 159 L.Ed. 2d 312, 72 U.S.L.W. 4516, 2004 U.S. LEXIS 4571 (United States Supreme Court--March 23, 2004) Juan Davila was a participant in an employer-provided benefit plan subject to ERISA (the Employee Retirement Income Security Act of 1974) and Ruby Calad was a beneficiary under another such plan. Under the terms of Davila's plan, administered by Aetna Health, Inc. (formerly Aetna U.S. Healthcare), requests for coverage and payment to health-care providers are reviewed by Aetna. Cigna Healthcare of Texas provided similar administration of Calad's plan. Davila experienced arthritis pain. His treating physician prescribed Vioxx. Aetna refused to pay for reasons not stated in the Court's opinion but presumably because Vioxx was not a prescription medication included in the plan's coverage for arthritis. Davila did not contest or appeal this decision and did not buy Vioxx on his own. Instead, he purchased Naprosyn, "fro...

Research paper thumbnail of Growth and biomass distribution of cherrybark oak ( Quercus pagoda Raf.) seedlings as influenced by light availability

Forest Ecology and Management, 1998

Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under fo... more Cherrybark oak (Quercrrs pagoda Raf.) seedlings were established and raised in the field under four light levels (100%.

Research paper thumbnail of Morphological indicators of stock quality and field performance of red oak (Quercus rubra L.) seedlings underplanted in a central Ontario shelterwood

New Forests, 1997

The value of initial stem diameter near the root collar, shoot length and number of first-order l... more The value of initial stem diameter near the root collar, shoot length and number of first-order lateral roots (FOLR) as morphological indicators of stock quality and field performance was examined for bareroot (1+0, undercut) red oak (Quercus rubra L.) underplanted in a shelterwood in central Ontario. These three attributes were measured on more than 400 seedlings prior to planting, and their relationship with height and basal diameter growth two years after planting was determined using correlation and regression analysis. Initial diameter, shoot length and number of FOLR were positively and significantly correlated with second-year height and diameter. These relationships were strongest for diameter, but this variable explained less than 25% of the total variation in growth. Of the three indicators, diameter was also the best predictor of several physical characteristics of root systems two years after planting. Initial diameter was significantly correlated with root volume, root area and lateral root, taproot and total root dry mass. Weaker relationships existed between initial shoot length and number of FOLR and second-year root system features. Stem diameter two years after planting was more strongly related to root volume, area and dry mass than was initial diameter, the probable result of adjustment in root-shoot balance of planting stock to the shelterwood environment.

Research paper thumbnail of Morphological and ecophysiological variation of the hybrid oak Quercus subpyrenaica ( Q. faginea × Q. pubescens

Trees-structure and Function, 2004

Natural hybridization is common among oaks. We studied the variability of morphological and ecoph... more Natural hybridization is common among oaks. We studied the variability of morphological and ecophysiological variables in the hybrid Quercus subpyrenaica and its assumed parental species Q. faginea and Q. pubescens, which co-occur in NE Spain. To assess the fitness of these taxa we studied several ecophysiological variables (hydraulic conductivity, K h; hydraulic specific conductivity, K s; leaf specific conductivity, LSC; water potential corresponding to a 50% loss of conductivity, PLC50; efficiency of light absorption, E a). We performed a correspondence analysis (CA) to ordinate seedlings, grown under homogeneous environmental conditions, according to their plant and leaf morphology. The CA axis 1 synthesized intra-taxon variability, while the CA axis 2 summarized inter-taxa variability. Q. subpyrenaica showed a wide spectrum of forms, but they were overall closer to those of Q. faginea. We defined three phenotypes within the hybrid based on morphology, which were: (i) the robur group (Qs-r; auriculate leaf base, rounded lobe apex); (ii) Q. pubescens (Qs-p; rounded leaf base, acute lobe apex); and (iii) Q. faginea (Qs-f; acute leaf base, acute-spiny lobe apex). The mean values of K s and PLC50 arranged the hybrid groups in the same order as the ordination based on leaf morphology. The Qs-r group showed the highest values of K s and PLC50, while the Qs-f group showed the lowest. Both morphologically and ecophysiologically, the hybrids showed a wide range of values, which spanned and even exceeded the variation of parental taxa.