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1. Biological diversity and the geography of nature

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Abstract
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Throughout history, insights into understanding the diversity of life forms have come from placing natural phenomena within an explicit geographic context. “Biological diversity and the geography of nature” maps the discoveries of early explorers in the field, from the Age of Enlightenment to the present day. Where do distinct species occur? How and why do they vary from place to place? Buffon’s Law identified three fundamental processes of biological diversity: evolution, dispersal (or immigration), and extinction. Biological processes are complex—not only because they arise from a variety of factors and processes including evolution, but because the species themselves interact to influence each of the fundamental processes.

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  • Book Chapter
  • Cite Count Icon 1
  • 10.1093/hesc/9781605354729.003.0016
From the Foundations to the Frontiers
  • Oct 31, 2016
  • Mark V Lomolino + 2 more

This chapter reviews the foundations and frontiers of biogeography. It explains that the long and distinguished history of biogeography is tightly interwoven with that of ecology and evolutionary biology. Knowledge of the patterns seen in the geography of nature and causal explanations of the processes responsible for them accumulated and matured into what we know as the science of biogeography. The chapter highlights that some of the most effective strategies for conserving the Earth's biological diversity will continue to rely on insights from biogeographers. It mentions how the expanding store of information and arsenal of analytical tools proved to be invaluable for reconstructing the Earth's geological and environmental dynamics and the biotas' evolutionary histories.

  • Research Article
  • 10.35841/genetic-engineering.3.1.1
Biosafety Law for GM Technology
  • Aug 4, 2020
  • Advancements in Genetic Engineering
  • Mark Rudolph

In thinking about the utilization of present day biotechnologies, explicitly hereditarily adjusted life forms (GMOs), the Malaysian government perceives the noteworthy likely advantages just as vulnerabilities, dangers and questions of this developing innovation. Despite the fact that extraordinary advantages of this innovation could help address future issues, yet, this innovation is frequently joined by open discussion over its possible dangers, which incorporates bioethical issues. In alleviating these dangers in a practical way, biosafety system is required so as to secure human, plant and creature wellbeing, the earth furthermore, biodiversity. One of the way to deal with the dangers is through guideline of equity dependent on law as a definitive innovation arrangement. The legislature passed the Biosafety Act in 2007 to fill in as an “umbrella demonstration” which incorporate the setting up of the National Biosafety Board just as lawful and institutional arrangements customized to conform to the Cartagena Protocol on Biosafety, with the goal to manage the import, send out, intentional discharge, contained use and advertising of GMOrelated items so as to secure human, plant and creature wellbeing, the earth and biodiversity. The inquiry is how does this law tending to bioethical issues and how viable the law in tending to this issue? The reason for this paper is to dissect the degree to which this Biosafety Act 2007 and its guidelines might be successfully coordinating bioethical issues identifying with GM crops in understanding its goals. The article explicitly centers around bioethical issues arrangements of GMOs under the Act and its guidelines. This paper embraces a subjective exploration technique of library-based strategy which incorporates a doctrinal examination of enactment and law. The paper presumes that bioethical thought is basic for the adequacy of the biosafety administrative structures and in advancing reasonable improvement The United States Supreme Court’s choice in Bowman versus Monsanto, infers that ranchers are legitimately has no privilege to spare seeds from licensed hereditarily adjusted (GM) crops one season, and plant them the following season . This left numerous ranchers unfit to discover top notch non-GM seed. Licenses really confine development, as scientists can no longer unreservedly utilize licensed plants in rearing experimentation . Today, GM organizations control almost threequarters of deals. This fixation has prompted more significant expenses and contracting decision for buyers. GM crops likewise influence biodiversity in manners that quality exchanges through cross fertilization bringing about hybridization with related species on the grounds that many plant species can be discovered both as a harvest and as a weed. Open additionally communicated their interests that people don’t have indisputably the option to change living things what’s more, required the requirement for legitimate and proper marking of present day biotechnology items. They were likewise worried about the related dangers to human wellbeing and the chance of market imposing business model by monster organizations and created nations. The morals and security of biotechnology have been bantered since researchers initially started to explore the new innovation in the early 1970s. The worry communicated about the security of biotechnology research prompted a ban of GM crops in specific states in Australia, in India and some European Union nations.

  • Research Article
  • Cite Count Icon 42
  • 10.1111/jbi.12525
The silence of biogeography
  • May 19, 2015
  • Journal of Biogeography
  • Mark V Lomolino + 2 more

Modern biogeography now encompasses an impressive diversity of patterns and phenomena of the geography of nature, providing insights fundamental to understanding the forces influencing the spatial and temporal dynamics of biological diversity. However, rather than praise our discipline for its great breadth of visions, our purpose here is to point out our glaring oversight of a potentially transformative frontier in the geography of nature. A new, emerging area called soundscape ecology, if guided by the principles of biogeography, holds the promise of ‘opening the ears’ of our field and providing fresh perspectives on fundamental problems being addressed by biogeographers.

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  • Research Article
  • Cite Count Icon 8
  • 10.21425/f5fbg12213
From the Foundations to the Frontiers of Biogeography
  • Mar 29, 2012
  • Frontiers of Biogeography
  • Lawrence R Heaney + 1 more

editorial ISSN 1948-6596 From the Foundations to the Frontiers of Biogeography The investigation of patterns of biological diversity selection of the term “frontiers” was made delib- on earth, a topic that has been a focal point of erately for its implication of vast unknown spaces study for over two hundred years, has arguably where wondrous things might be found. Rapid come to a single predominant conclusion: the dis- advances in increasingly detailed knowledge of tribution of organisms has been dynamic over the earth’s geological history, especially its tec- time, changing as a result of the changing geologi- tonic history, continued to overturn previous con- cal face of the earth, the changing climate of the cepts, and study of superb new fossil material has earth, and the dynamic nature of the organisms allowed a resurgence in paleobiogeography. Rapid themselves. At a meeting held at National Center increases in the ease and speed of conducting for Ecological Analysis and Synthesis in Santa Bar- studies using DNA sequencing technology has cre- bara, California in September 2001, which was ated the new field of phylogeography, which has held principally to organize a volume on the Foun- given us bold new perspectives on the history of dations of Biogeography (Lomolino et al. 2004), it diversification and distribution patterns all over was abundantly clear that the field of biogeogra- the globe. The dynamics that underlie patterns of phy had not only an illustrious past, but was en- species richness, especially on islands and along tering an exciting and potentially transformative elevational gradients, have changed rapidly as new data have emerged and new questions have stage of development. Two decisions were reached quickly at that provided new insights that have in turn led to still meeting in Santa Barbara: 1) to organize a new more new questions. There is a growing recogni- society that would provide a forum for biogeogra- tion that marine and terrestrial biogeography, phers world-wide to meet regularly and exchange long discussed in different journals using different new ideas and methods, and 2) to publish a vol- terminology, have a great deal in common and will ume that would exemplify the emerging concepts provide reciprocal illumination in many respects. and identify the most promising directions for fu- And a new term and topic of focus emerged that ture reseearch. The International Biogeography recognizes the value of the data and issues that Society (IBS) held its first meeting in Mesquite, Nevada in 2003, and the papers presented during its symposia became the basis for a book, “Frontiers of Biogeography: New Directions in the Geography of Nature”, which we were honored to organize and edit for publication (Lomolino and Heaney 2004). Thus, the IBS and the recognition of continued dynamic development of conceptual issues in biogeography have been intertwined since the origin of the society. The title of the book was one that we con- sidered carefully. It is our sense that much about biogeography remains unknown, and that both patterns and processes that are of fundamental importance may, even today, be entirely unknown or existing only as a glimmer in someone’s mind. Thus, we wished to choose a title that emphasized that the field was entering an exciting period of Butterfly logo for the original Frontiers of Biogeography great discovery, rather than one of confirmation book (designed by Mark V. Lomolino), that will also be of past ideas and a state of final resolution. The part of the image of this new journal. frontiers of biogeography 1.1, 2009 — © 2009 the authors; journal compilation © 2009 The International Biogeography Society

  • Research Article
  • 10.29006/1564-2291.jor-2019.47(6).10
ИССЛЕДОВАНИЯ ВОДООБМЕНА В ГЛУБОКОВОДНЫХ РАЗЛОМАХ АТЛАНТИКИ. 46 РЕЙС
  • Dec 30, 2019
  • По Результатам Отчета Начальника Экспедиции

The expedition was carried out within the framework of the RAS Presidium Program No. 49 «Interaction of physical, chemical and biological processes in the world ocean». The program of the voyage was carried out in accordance with the following topics: state task No. 0149-2018-0003 «Mechanisms of formation of circulating structures Of the world ocean: key processes in boundary layers and their role in ocean dynamics on the basis of expeditionary research, numerical and laboratory modeling»; No. 0149-2018-0031 « Interaction of physical, chemical and biological processes in the world ocean»; the Project «processes affecting sedimentation in the world ocean; No. 0149-2018-0033» Interaction of physical, chemical and biological processes In the world ocean»; the project «Changes in marine biodiversity under the influence of climatic and anthropogenic factors»; No. 0149-2018-0018 « Evolution of the organic world. Role and influence of planetary processes»; project « Evolution of oceanic biota: influence of abiotic and biotic environmental factors»; No. 0149-2018-0009 « Ecologically dangerous and catastrophic phenomena of biological nature in the seas and ocean: impact on ecosystems, accumulated environmental risks, pollution, species-universes, anomalous and harmful «blooms» of marine organisms in the Russian marine Arctic and the seas of Russia».

  • Research Article
  • 10.17721/2308-135x.2025.78.46-55
ПРИРОДНИЧО-ГЕОГРАФІЧНІ МОДЕЛІ ТА ПРИНЦИПИ ЇХНЬОЇ СИСТЕМАТИЗАЦІЇ
  • Jan 1, 2025
  • GEOGRAPHY AND TOURISM
  • Viktor Samoilenko + 2 more

The purpose of the article is to reflect the diversity of natural and geographical models and reveal the basic principles of their systematization. Methodology. The study is based on the theoretical and methodological provisions of landscape ecology and constructive geography. The methods of probabilistic analysis and geoinformation modeling in geoecology are used. The authors of this work have applied many years of scientific and methodological experience and applied research in the scope of natural and geographical modeling. Results. The theoretical and methodological foundations of natural and geographical modeling are presented, aimed at studying the structure, dynamics and state of natural geosystems, connections and processes within them, between them and with the external environment using natural and geographical models. In particular, the concepts of model and modeling in a broad sense are considered, and definitions of the concepts of "natural and geographical model" and "natural and geographical modeling" are provided. Natural and geographical models are analyzed and their systematization is justified according to the main principles: by the object of modeling (research); by a number of features, primarily by purpose; by the logic of applying models; by the method of constructing models and the method of transmitting similarity relations; by certain possible combinations of the above principles. The modes of application and forms of creating / presenting models are noted. The methods of natural and geographical modeling, the requirements for models as a means of scientific knowledge are listed and characterized, and two fundamental directions of natural and geographical modeling using precisely formalized methods are considered. The scientific novelty lies in the implementation of a conceptual and applied presentation of the content and means for natural and geographical modeling, which is the toolkit of both modern landscape ecology and natural geography in general. The interpretation of the concepts of "natural and geographical model", "natural and geographical modeling" is provided. The most appropriate principles of systematization of natural and geographical models have been determined, which are the basis for optimizing the management of natural geosystems, processes and phenomena occurring in them. At the same time, natural geosystems are interpreted as complex controllable native-natural-anthropogenic systems with the exploitation of their resources. Practical significance. The obtained results can be used by specialists in the scope of environmental conservation and recovery based on optimizing resource use, taking into account transboundary environmental cooperation. The principles outlined in this work are used in teaching a number of environmental disciplines aimed at forming special competencies of higher education applicants (knowledge, skills, expertise, formation of a geographical vision of the world, emotional and value-based attitude towards the environment and human activity in it).

  • Research Article
  • Cite Count Icon 96
  • 10.1098/rstb.2010.0296
Biological diversity in a changing world
  • Nov 27, 2010
  • Philosophical Transactions of the Royal Society B: Biological Sciences
  • Anne E Magurran + 1 more

From the pioneering explorations of Joseph Banks (later a President of the Royal Society), to the present day, a great deal has been learnt about the extent, distribution and stability of biological diversity in the world. We now know that diverse life can be found even in the most inhospitable places. We have also learned that biological diversity changes through time over both large and small temporal scales. These natural changes track environmental conditions, and reflect ecological and evolutionary processes. However, anthropogenic activities, including overexploitation, habitat loss and climate change, are currently causing profound transformations in ecosystems and unprecedented loss of biological diversity. This series of papers considers temporal variation in biological diversity, examines the extent of human-related change relative to underlying natural change and builds on these insights to develop tools and policies to help guide us towards a sustainable future.

  • Research Article
  • Cite Count Icon 101
  • 10.1016/j.cub.2005.02.006
Biological diversity
  • Feb 1, 2005
  • Current Biology
  • Anne E Magurran

Biological diversity

  • Supplementary Content
  • 10.7892/boris.76185
Biotic and abiotic controls of nitrogen and phosphorus cycling in Central European forests
  • Jan 1, 2015
  • Open Access CRIS of the University of Bern
  • Martin Schwarz

The functioning and services of Central European forests are threatened by global change and a loss of biodiversity. Nutrient cycling as a key forest function is affected by biotic drivers (e.g., dominant tree species, understory plants, soil organisms) that interact with abiotic conditions (e.g., climate, soil properties). In contrast to grassland ecosystems, evidence for the relationship of nutrient cycles and biodiversity in forests is scarce because the structural complexity of forests limits experimental control of driving factors. Alternatively, observational studies along gradients in abiotic conditions and biotic properties may elucidate the role of biodiversity for forest nutrient cycles. This thesis aims to improve the understanding of the functional importance of biodiversity for nutrient cycles in forests by analyzing water-bound fluxes of nitrogen (N) and phosphorus (P) along gradients in biodiversity in three regions of Germany. The tested hypotheses included: (1) temperate forest canopies retain atmospheric N and retention increases with increasing plant diversity, (2) N release from organic layers increases with resource availability and population size of decomposers but N leaching decreases along a gradient in plant diversity, (3) P leaching from forest canopies increases with improved P supply from recalcitrant P fractions by a more diverse ectomycorrhizal fungal community. In the canopies of 27 forest stands from three regions, 16 % to 51 % of atmospheric N inputs were retained. Regional differences in N retention likely resulted from different in N availability in the soil. Canopy N retention was greater in coniferous than in beech forests, but this was not the case on loessderived soils. Nitrogen retention increased with increasing tree and shrub diversity which suggested complementary aboveground N uptake. The strength of the diversity effect on canopy N uptake differed among regions and between coniferous and deciduous forests. The N processing in the canopy directly coupled back to N leaching from organic layers in beech forests because throughfall-derived N flushed almost completely through the mull-type organic layers at the 12 studied beech sites. The N release from organic layers increased with stand basal area but was rather low (< 10 % of annual aboveground litterfall) because of a potentially high microbial N immobilization and intensive incorporation of litter into the mineral soil by bioturbation. Soil fauna biomass stimulated N mineralization through trophic interactions with primary producers and soil microorganisms. Both gross and net leaching from organic layers decreased with increasing plant diversity. Especially the diversity but not the cover of herbs increased N uptake. In contrast to N, P was leached from the canopy. Throughfall-derived P was also flushed quickly through the mull-type organic layers and leached P was predominantly immobilized in non directly plant-available P fractions in the mineral soil. Concentrations of plant-available phosphate in mineral soil solution were low and P leaching from the canopy increased with increasing concentrations of the moderately labile P fraction in soil and increasing ectomycorrhiza diversity while leaf C:P ratios decreased. This suggested that tree P supply benefited from complementary mining of diverse mycorrhizal communities for recalcitrant P. Canopy P leaching increased in years with pronounced spring drought which could lead to a deterioration of P supply by an increasing frequency of drought events. This thesis showed that N and P cycling in Central European forests is controlled by a complex interplay of abiotic site conditions with biological processes mediated by various groups of organisms, and that diverse plant communities contribute to tightening the N cycle in Central European forests and that diverse mycorrhizal communities improve the limited P availability. Maintaining forest biodiversity seems essential to ensure forest services in the light of environmental change.

  • Supplementary Content
  • 10.5451/unibas-005715645
Epidemiology of Angiostrongylus cantonensis and eosinophilic meningitis in the People's Republic of China
  • Jan 1, 2011
  • edoc (University of Basel)
  • Shan Lv

Epidemiology of Angiostrongylus cantonensis and eosinophilic meningitis in the People's Republic of China

  • Research Article
  • Cite Count Icon 1
  • 10.1002/ijch.201900033
Chemical Biology: Powerful Synergy Between Two Cultures
  • Feb 1, 2019
  • Israel Journal of Chemistry
  • Ashraf Brik + 1 more

Dear Reader, the explosive growth of the young field of Chemical Biology (CB) is evident from its high-profile journals, including Nature Chemical Biology, ACS Chemical Biology, Cell Chemical Biology and ChemBioChem, and from its popular conferences, such as EMBO biannual chemical biology meeting, which attract increasing audiences from both academia and industry. Several prestigious Chemistry Departments have changed their names to Department of Chemistry and Chemical Biology to accommodate the glory and appeal of CB to the young generation of scientists.

  • Research Article
  • 10.18524/2303-9914.2018.1(32).141949
PHYTODIVERSITY OF PRESENT LANDSCAPES OF UKRAINIAN FOREST-STEPPE ZONE (BY THE EXAMPLE OF APART AREAS OF HAISYN DISTRIC T, VINNYTSIA REGION)
  • Sep 10, 2018
  • Odesa National University Herald. Geography and Geology
  • А В П’Яткова + 1 more

Problem Statement and Purpose. Biological diversity is one of the fundamental property of natural complexes, which provides their firmness and shows up on the different levels of their hierarchy. Within the biodiversity researchers mark out phytodiversity which is an account of plant species of the complex.The main purpose of the research is assessment of phytodiversity of relatively natural territorial systems of forest-steppe zone in the conditions of powerful anthropogenic influence. Relatively natural landscapes are the systems which have not been used in human activity for 10 years and more. Present days there are not a lot of such areas because new type of landscapes - agroindustrial complexes - covers large territories. So it is important to know if remaining relatively natural complexes are sustainable. Data iC Methods. The field research of phytodiversity was done in summer 2017. The subjects of research were the areas of steppe and woods on slopes of PivdennyiBug’s and Sob’s valleys (Haisyn district, Vinnytsia region). Standard methods of field describing and assessment of phytodiversity were used.One of basic parameters of phytocenosis firmness is the species composition like an amount of all plants species of phytocenosis in set geographical conditions. The coefficient of germination shows the deviation from the norm of species composition. The index of adventitious species and weed is a value for description of species composition and its transformation under anthropogenic pressure. Also one of the impotent characteristics of species variety is the spectrum of life forms which describes the stability of natural zone.Results. Due to research and calculations it is got that the coefficient of germination was about 55% for steppe areas and only 38% for woods. The index of adventitious species and weed is highly for wooden territories. It means that forests are less steady than steppes.At present days the relatively natural steppe systems (by the example of Haysin district, Vinnytsya region) are characterized with a high germination and monotony regardless of their location. The amount of species is more than 30 for each area. Such complexes might be steady for a long tune. But the wood complexes are unsteady enough and feel the substantial changes in species composition at the increase of the anthropogenic loading. Although their spectrum of life forms corresponds with forest-steppe natural zone.

  • Research Article
  • Cite Count Icon 2
  • 10.1111/j.1468-4004.2007.48322.x
Half a billion years of good weather: Gaia or good luck?
  • Jun 1, 2007
  • Astronomy &amp; Geophysics
  • Dave Waltham

Earth’s climate has been unusually stable over the Phanerozoic (Greek: visible animal life) eon, the most recent 550 million years of Earth’s history during which organisms have been large and hard enough to form plentiful fossils. For the previous 4000 million years, most of the planet’s lifetime, living things were microscopic, and the climate was much more varied. Oxygen isotope ratios in ancient seashells suggest that, in the Phanerozoic, globally averaged temperatures have generally varied by less than 10 °C from their present value of 15 °C (Veizer et al. 2000). The record of ice-rafted debris preserved in ancient seafloor sediments tells a similar story of a climate that, while showing interesting variations, has rarely differed greatly from that of the present day. This contrasts with the previous 4 billion years of Earth history which is characterized by occasional snowball-Earth episodes (Hoffman et al. 1998), when temperatures were suppressed at least 20 °C, and which also shows evidence of periods when our world was 40 °C warmer than today (Schwartzman 1999). The consistent Phanerozoic temperatures are particularly surprising in the light of the 5% increase in solar luminosity over that time, the 15-fold reduction in atmospheric carbon dioxide concentrations (Berner 1997) and the inevitable variations in Earth-albedo resulting from continental growth and the evolution of land-plants, among other factors. It should be emphasized that there is no problem with understanding why there was significant climatic variability prior to the Phanerozoic. Astronomical, geological and biological processes were constantly altering the solar luminosity, the Earth’s albedo and the greenhouse gas concentrations in our atmosphere and these changes could, in principle, have caused temperature fluctuations even higher than those seen. The real problem is in understanding why temperature fluctuations dropped so dramatically during the Phanerozoic. A widely accepted explanation for long-term climate stability is that chemical-weathering of continental rocks by weakly carbonated rainfall gradually scrubs the greenhouse gas carbon dioxide from the atmosphere and, since this chemical reaction is temperature dependent, the result is a negative-feedback control on climate (Walker et al. 1981). However, while this process can certainly keep the Earth habitable (i.e. it can maintain temperatures allowing the existence of liquid water) it does not seem capable of providing the very fine control on temperature that is characteristic of the Phanerozoic. The coincidence of the emergence of multicelled organisms and of climate stability supports James Lovelock’s Gaia hypothesis that the Earth’s biosphere evolves to maintain optimum conditions for life. Indeed one of the best known Gaia-based models (DaisyWorld, introduced by Watson and Lovelock in 1983) shows how a simple biosphere can control global temperature and enhance climate stability. However, anthropic selection offers another possibility: perhaps climate stability is necessary for complex life and so complex life only evolved because Earth, by chance, provided a stable environment. The probability of such good fortune may seem small but, given the probable number of planets in the universe (>10), it is almost bound to happen on a few lucky worlds. This planetary-level form of anthropic selection, in which we find ourselves living on an unusual planet simply because the conditions necessary for the emergence of intelligent life are rare (Ward and Brownlee 2000), should be distinguished from the more commonly discussed cosmological-level anthropic selection which postulates the existence of multiple universes only some of which have laws of physics which are life-friendly (Barrow and Tipler 1986). Anthropic ideas remain controversial, largely because it is notoriously difficult to provide clear evidence in their favour. It will always be difficult to disentangle feedback from good luck when looking at geological or biological surface processes, but astronomical factors do not have this problem. For example, there is no mechanism whereby the eccentricity of the Earth’s orbit could vary in response to climate change on the Earth’s surface. If our world turns out to have an unusually circular orbit when compared to terrestrial planets around most stars, this is likely to result from anthropic selection. The Moon’s properties too, may provide evidence in support of anthropic selection.

  • Book Chapter
  • 10.1201/b11827-48
3 Why conserve biodiversity
  • Mar 22, 2012
  • U Aswathanarayana

Variety is both the spice of life and basis of its survival. The importance of biological diversity to human society is hard to overstate. An estimated 40 percent of the global economy is based on biological products and processes. Poor people, especially those living in areas of low agricultural productivity, depend heavily on the genetic diversity of the environment. Forests protect the watersheds, moderates climate and act as the foster mother of agriculture. They hold the key to global food and water security. Darwin’s hypothesis of natural selection and survival of the fittest will have no operational validity if our planet is not so rich in biological diversity; this provided opportunities for the domestication of plants and animals leading to the birth of agriculture about 10,000 years ago. Loss of diversity at any of the level is detrimental to the life-supporting environment of the earth and disruptive of the natural processes that are vital for biological evolution. As many of the world’s diverse life forms from microbes to higher animals and plants have a direct or indirect bearing on agriculture, conservation of these is essential for sustainable agriculture (Swaminathan and Jana, 1992). Each time we take a medicine, the chances are one in two that its origin was a wild plant. The commercial value of such drugs is around US$15 billion per year in the United States and about US$40 billion worldwide. Ecosystem stability is another compelling reason for preserving biodiversity. Natureis beautifully balanced; each little thing has its own place, its duty and special utility. Any disturbance creates a chain reaction which may not be visible for sometime. All living organisms are an integral part of the biosphere and provide invaluable services. These include the control of pests, the recycling of nutrients, the replenishment of local climate, the control of flood etc. Civilization depends on the survival of the biological world. By conserving biodiversity at the ecosystem level, not only are the constituent species preserved, but the ecosystem functions and services are also protected. These ecosystem functions include pollutant cycling, climate control, as wellas non-consumptive recreation, and scientific values (Norton and Ulanowicz, 1992). Biodiversity also needs to be preserved for the aesthetic services it provides. According to Norman Myers “We can marvel at the colours of a butterfly, the grace of a giraffe, the power of an elephant and the delicate structure of a diatom. Every time a species goes extinct we are irreversibly impoverished. Protection of biodiversity also makes good economic sense.’’ He has further stated that, “from morning coffee to evening nightcap we benefit in out daily life style from the fellow species that share out one earth home. Without knowing it, we utilize hundreds of products each day that owe their origin to wild animals and plants. Indeed our welfare is intimately tied up with the welfare of wildlife. We may proclaim that by saving the lives of wild species, we may be saving our own’’ (Myers, 1986).

  • Research Article
  • 10.54991/jop.1990.1684
Environmental change and biological diversity: Present, past and future
  • Dec 31, 1990
  • Journal of Palaeosciences
  • A.S Raghubanshi + 1 more

The present paper reviews the current distribution and factors determining the level of biological diversity. Past climate changes causing mass extinctions, lessons drawn from these past events and the impact of future climate change on biological diversity in its broadest sense are also considered. Large scale changes in vegetation zones and composition, over extensive parts of the globe are indicated. Displacement of isotherms due to rise in global temperatures would necessitate very rapid species shifts which may be possible only with human assistance except for plants propagated by spores or dust seeds. Rates of migration and behaviour of the migrating species will determine their range shift capabilities. Differences in migration rates may result in new combinations of species because of dissociation of communities into their component species. Species rigidly associated to a particular set of environmental conditions may well become extinct Characteristics such as large population size, broad geographical distribution and high dispersal potentials will protect species from extinction. Increased pressure from invaders, increased frequency of epidemics and alteration of productivity and species distributions are indicated. Elevated sea water temperatures may badly damage sea flora and fauna as is exemplified by present day El nino effects. Destruction of coastal habitats due to sea level rise may affect birds and fishes using sail marshes, estuaries and islets as breeding ground. Island species will be severely affected both due to reduced area and limitations of latitudinal migration. Changes in precipitation pattern may result in reduced avian and mammalian populations in many parts of the world.

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