Hyper-arid tall shrub species have differing long-term responses to browsing management

© 2019, © 2019 Taylor & Francis Group, LLC. Hyper-arid rangeland vegetation is typically dominated by large woody species which are often overlooked in herbivory studies. Long-term responses of tall shrub populations to herbivory change are poorly understood in the Arabian Peninsula. Population and size of 1559 individuals from four shrub species were assessed over an 11-year period under two herbivory regimes, one in which domestic livestock (camels) were replaced by semi-wild ungulates (Oryx and gazelles) before, and the other during, the study period. Each shrub species exhibited a different response to the change in herbivory. Populations of Calotropis procera decreased dramatically. Populations of both Calligonum polygonoides and Lycium shawii increased through sexual reproduction, but the spatial distribution of recruits indicated different modes of seed dispersal. Average lifespans were estimated at 22 and 20years respectively. The persistence strategy of Leptadenia pyrotechnica was similar to tree species of this habitat in that vegetative regrowth was prioritized over recruitment, and average lifespan was estimated at 95years. Shrub responses to changes in ungulate management are therefore species-specific. The response of individual plant size was faster than the response of population size, which was limited by slow sexual recruitment (L. pyrotechnica) or localized seed dispersal (C. polygonoides)

Mortality, Recruitment and Change of Desert Tree Populations in a Hyper-Arid Environment

BACKGROUND: Long-term vegetation changes in hyper-arid areas have long been neglected. Mortality, recruitment and change in populations of the ecologically and culturally important and drought persistent Acacia tortilis and Balanites aegyptiaca are therefore estimated in the Eastern Desert of Egypt, and are related to the primary agents of change, water conditions and human intervention. METHODOLOGY: A change analysis using high-resolution Corona images (1965) in combination with field data (2003) is the basis for recruitment, mortality and change estimates. For assessing the influence of water conditions on patterns in recruitment and survival, different types of generalized linear models are tested. CONCLUSIONS: The overall trend in population size in that part of the Eastern Desert studied here is negative. At some sites this negative trend is alarming, because the reduction in mature trees is substantial (>50%) at the same time as recruitment is nearly absent. At a few sites there is a positive trend and better recruitment. Frequent observations of sprouting in saplings indicate that this is an important mechanism to increase their persistence. It is the establishment itself that seems to be the main challenge in the recruitment process. There are indications that hydrological variables and surface water in particular can explain some of the observed pattern in mortality, but our results indicate that direct human intervention, i.e., charcoal production, is the main cause of tree mortality in the Eastern Desert

Secretory structures in plants: lessons from the Plumbaginaceae on their origin, evolution and roles in stress tolerance

Special IssueThe Plumbaginaceae (non-core Caryophyllales) is a family well known for species adapted to a wide range of arid and saline habitats. Of its salt-tolerant species, at least 45 are in the genus Limonium; two in each of Aegialitis, Limoniastrum and Myriolimon, and one each in Psylliostachys, Armeria, Ceratostigma, Goniolimon and Plumbago. All the halophytic members of the family have salt glands, which are also common in the closely related Tamaricaceae and Frankeniaceae. The halophytic species of the three families can secrete a range of ions (Na+, K+, Ca2+, Mg2+, Cl−, HCO3 −, SO4 2-) and other elements (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn). Salt glands are, however, absent in salt-tolerant members of the sister family Polygonaceae. We describe the structure of the salt glands in the three families and consider whether glands might have arisen as a means to avoid the toxicity of Na+ and/or Cl− or to regulate Ca2+ concentrations within the leaves. We conclude that the establishment of lineages with salt glands took place after the split between the Polygonaceae and its sister group the Plumbaginaceaeinfo:eu-repo/semantics/publishedVersio

الاستكشافات النباتية في سيناء

The history of the botanical exploration of Sinai has been reviewed. It has been divided into the following periods: I. Expeditions in the eighteenth century. II. Exploration from 1800 till the publication of "Florula Sinaica". III. Exploration from 1835 till the publication of "Flora Orientalis". IV. A decade of intensive exploration (1861-1871). V. An era of extensive floristic studies (1871-1929) with the publication of the Flora of Egypt. VI. A period of updating. VII. An era of phytoecological studies. A chronological list of those who contributed to the botany of Sinai and their contribution are given. The motivations and inspiration for the studies undertaken in sinai are investigated.استعرضت الدراسة تاريخ الدراسات النباتية في شبه جزيرة سيناء ، وقسمت مراحل الاستكشاف إلى فترات يتميز كل منها بإنجاز أو اتجاه معين ، على النحو الاتي : 1- البعثات في القرن الثامن عشر . 2- الاستكشافات من عام 1800 م حتى نشر أول دراسة خاصة عن فلووا سيناء . 3- الاستكشافات من عام 1830 م حتى نشر الفلورا الموسوعية الضخمة عن بلدان الشرق للعالم بواسيير خلال السنوات من 1867 حتى 1884 . 4- عقد من الاستكشافات المكثفة (1861 - 1871) . 5- عصر من الدراسات الشاملة للفلورا (1871 - 1929) وظهور مؤلفات عن الفلورا المصرية . 6- فترة التحديث . 7- عصر الدراسات البيئية النباتية . وفي كل من هذه الفترات ، قدمت الدراسة عرضا مسلسلا لكل من : العلماء والدارسين وجامعي النباتات وذوى التخصصات المختلفة الذين أسهموا في الدراسات النباتية وما يرتبط بها من علوم . وقد وضح قرين كل منهم ما نشره من مؤلفات وبحوث منذ 1775 حتى الان . كما ناقشت الدراسة الحوافز والدوافع وراء اجراء الدراسات العلمية في شبه جزيرة سيناء