Woody vegetation change in Sahelian West Africa: evidence
... The West African Sahel has for long been affected by different types of vegetation changes. Natural long-term climatic changes and following vegetation changes have been documented for the last centuries (Lézine, 1989). Short-term changes became obvious with the droughts of the 1970s and 1980s (Cla ...
... The West African Sahel has for long been affected by different types of vegetation changes. Natural long-term climatic changes and following vegetation changes have been documented for the last centuries (Lézine, 1989). Short-term changes became obvious with the droughts of the 1970s and 1980s (Cla ...
Zalophus wollebaeki, Galápagos Sea Lion
... Galápagos Sea Lions are polygynous and males hold territories mostly along the shoreline in shallow water that they vociferously and aggressively defend. Male tenure on territories usually lasts from a few days to one month. Males may be more than once on territory during the drawn out reproductive ...
... Galápagos Sea Lions are polygynous and males hold territories mostly along the shoreline in shallow water that they vociferously and aggressively defend. Male tenure on territories usually lasts from a few days to one month. Males may be more than once on territory during the drawn out reproductive ...
Ecological Equivalence: A Realistic Assumption for Niche Theory as
... Theoretical studies have sought various ways to reconcile neutral patterns with niche concepts. Intrinsically similar species can coexist under niche theory [7], and niches add stabilizing mechanisms that are absent under the fitness equivalence of intrinsic neutrality [10]. Comparisons of niche to ...
... Theoretical studies have sought various ways to reconcile neutral patterns with niche concepts. Intrinsically similar species can coexist under niche theory [7], and niches add stabilizing mechanisms that are absent under the fitness equivalence of intrinsic neutrality [10]. Comparisons of niche to ...
Habitat and Niche
... A species’ niche must be specific to that species; no two species can fill the same niche. They can have very similar niches, which can overlap, but there must be distinct differences between any two niches. When plants and animals are introduced, either intentionally or by accident, into a new envi ...
... A species’ niche must be specific to that species; no two species can fill the same niche. They can have very similar niches, which can overlap, but there must be distinct differences between any two niches. When plants and animals are introduced, either intentionally or by accident, into a new envi ...
Critical reading questions - College of Biological Sciences
... CA. Humpbacks are listed as endangered under the ESA and vulnerable by the IUCN. as “known” (historical or ongoing) or “potential” (uncertain or future), as indiFisheries Department 2004); thus, overexploitation has cated by the listing agency (Table 1). Major and minor the potential to be a major t ...
... CA. Humpbacks are listed as endangered under the ESA and vulnerable by the IUCN. as “known” (historical or ongoing) or “potential” (uncertain or future), as indiFisheries Department 2004); thus, overexploitation has cated by the listing agency (Table 1). Major and minor the potential to be a major t ...
Aquatic Organisms f Introduced into North America
... "exotic," implying that it refers to an introduced organism from a foreign country. The release of organisms from one drainage system to another within our American waters is regarded as a transplant. Most of our data pertain to the freshwater fish fauna of the United States. Other exotic animal and ...
... "exotic," implying that it refers to an introduced organism from a foreign country. The release of organisms from one drainage system to another within our American waters is regarded as a transplant. Most of our data pertain to the freshwater fish fauna of the United States. Other exotic animal and ...
BIODIVERSITY AND HAZARDS MANAGEMENT
... like Robert E. Jenkins. and Thomas Lovejoy. The word biodiversity itself may have been coined by W.G. Rosen in 1985 while planning the National Forum on Biological Diversity organized by the National Research Council (NRC) which was to be held in 1986, and first appeared in a publication in 1988 whe ...
... like Robert E. Jenkins. and Thomas Lovejoy. The word biodiversity itself may have been coined by W.G. Rosen in 1985 while planning the National Forum on Biological Diversity organized by the National Research Council (NRC) which was to be held in 1986, and first appeared in a publication in 1988 whe ...
Community Ecology_54
... resources is called the species’ ecological niche An ecological niche can also be thought of as an organism’s ecological role Ecologically similar species can coexist in a community if there are one or more significant differences in their niches ...
... resources is called the species’ ecological niche An ecological niche can also be thought of as an organism’s ecological role Ecologically similar species can coexist in a community if there are one or more significant differences in their niches ...
Spatial distributions of tree species in a subtropical forest of China
... tree species are highly sparsely distributed. Important but challenging questions have been raised from such pattern. For example, how individuals of a spatially sparse population interact, how the viability of the population is maintained, and how the sparse populations on different trophic levels ...
... tree species are highly sparsely distributed. Important but challenging questions have been raised from such pattern. For example, how individuals of a spatially sparse population interact, how the viability of the population is maintained, and how the sparse populations on different trophic levels ...
Spatial distributions of tree species in a subtropical forest of China
... tree species are highly sparsely distributed. Important but challenging questions have been raised from such pattern. For example, how individuals of a spatially sparse population interact, how the viability of the population is maintained, and how the sparse populations on different trophic levels ...
... tree species are highly sparsely distributed. Important but challenging questions have been raised from such pattern. For example, how individuals of a spatially sparse population interact, how the viability of the population is maintained, and how the sparse populations on different trophic levels ...
File
... http://seattletimes.nwsource.com/ABPub/2011/01/28/2014070369.jpg http://www.theresilientearth.com/files/images/kudzu-covered-house.jpg http://www.dfw.state.or.us/conservationstrategy/images/invasive_species/northern_snakehead_tramm ell.jpg http://conservation-issues.co.uk/CIUK%20Gallery/1.%20Environ ...
... http://seattletimes.nwsource.com/ABPub/2011/01/28/2014070369.jpg http://www.theresilientearth.com/files/images/kudzu-covered-house.jpg http://www.dfw.state.or.us/conservationstrategy/images/invasive_species/northern_snakehead_tramm ell.jpg http://conservation-issues.co.uk/CIUK%20Gallery/1.%20Environ ...
The canopy beetle faunas of Gondwanan element trees in Chilean
... situation. It is now possible to establish whether the relative sizes of the canopy guilds of Gondwanan-derived forests are consistent with or divergent from those found in other regions. This study is intended to describe the coleopteran diversity of the canopies of two important Gondwanan tree gen ...
... situation. It is now possible to establish whether the relative sizes of the canopy guilds of Gondwanan-derived forests are consistent with or divergent from those found in other regions. This study is intended to describe the coleopteran diversity of the canopies of two important Gondwanan tree gen ...
Colour Patterns Do Not Diagnose Species
... differentiated by two polymorphisms that represent synonymous substitutions. Danish, Irish and Orkney Island B. cryptarum resolved as a monophyletic group with Finnish representatives, resolving as a sister group to the main group (Clade 2; 0.99 BPP). Finnish specimens possessed 8 polymorphisms with ...
... differentiated by two polymorphisms that represent synonymous substitutions. Danish, Irish and Orkney Island B. cryptarum resolved as a monophyletic group with Finnish representatives, resolving as a sister group to the main group (Clade 2; 0.99 BPP). Finnish specimens possessed 8 polymorphisms with ...
Latitudinal gradients in taxonomic overdescription rate affect
... with continental region. We scored validity as 1 (presently viewed as valid) or 0 (presently ...
... with continental region. We scored validity as 1 (presently viewed as valid) or 0 (presently ...
wet tropics of queensland
... Gondwanan times, its living flora, with the highest concentration of primitive, archaic and relict taxa known, is the closest modern-day counterpart for Gondwanan forests. In addition, all of Australia’s unique marsupials and most of its other animals originated in rainforest ecosystems, and the Wet ...
... Gondwanan times, its living flora, with the highest concentration of primitive, archaic and relict taxa known, is the closest modern-day counterpart for Gondwanan forests. In addition, all of Australia’s unique marsupials and most of its other animals originated in rainforest ecosystems, and the Wet ...
Urbanization, Biodiversity, and Conservation
... Also, urbanization is often more lasting than other types of habitat loss. Throughout much of New England, for example, ecological succession is restoring forest habitat lost from farming and logging, whereas most urbanized areas in that region not only persist but continue to expand and threaten ot ...
... Also, urbanization is often more lasting than other types of habitat loss. Throughout much of New England, for example, ecological succession is restoring forest habitat lost from farming and logging, whereas most urbanized areas in that region not only persist but continue to expand and threaten ot ...
New stands of species of the Paramecium aurelia
... and distributed on all continents in many freshwater reservoirs. Correlation of geographic distribution and genetic diversity is still questionable. Molecular comparison of several genes from a widely dispersed collection of P. aurelia sibling species did not support the presumption of a huge global ...
... and distributed on all continents in many freshwater reservoirs. Correlation of geographic distribution and genetic diversity is still questionable. Molecular comparison of several genes from a widely dispersed collection of P. aurelia sibling species did not support the presumption of a huge global ...
Section 6.3
... Threats to Biodiversity • Species diversity is related to genetic diversity. The more genetically diverse a species is, the greater its chances of surviving disturbances. So as human activity reduces genetic diversity, species are put at a greater risk for extinction. • Species diversity is also l ...
... Threats to Biodiversity • Species diversity is related to genetic diversity. The more genetically diverse a species is, the greater its chances of surviving disturbances. So as human activity reduces genetic diversity, species are put at a greater risk for extinction. • Species diversity is also l ...
Penicillium astrolabium and Penicillium neocrassum, two new
... (2005). The origin of these and all the strains used for comparison is provided (TABLE I). The strains are stored in the Agriculture Research Service (ARS) Culture Collection (NRRL) and in Micoteca da Universidade do Minho culture collection (MUM) and available on request. ...
... (2005). The origin of these and all the strains used for comparison is provided (TABLE I). The strains are stored in the Agriculture Research Service (ARS) Culture Collection (NRRL) and in Micoteca da Universidade do Minho culture collection (MUM) and available on request. ...
Environmental Pressures: Human Activities That Affect
... The alteration of the land into farms to feed the human population takes habitat away from wild populations. The application of fertilizers and pesticides also causes problems for wild species: Fertilizers add nutrients to the soil and waters, promoting the growth of algae and bacteria, and pesticid ...
... The alteration of the land into farms to feed the human population takes habitat away from wild populations. The application of fertilizers and pesticides also causes problems for wild species: Fertilizers add nutrients to the soil and waters, promoting the growth of algae and bacteria, and pesticid ...
Using assembly rules to measure the resilience of riparian
... impacts on environmental factors and thus on assembly rules of host communities. Further, the subantarctic forests of the Fuegian Archipelago are relatively simple, making it a manageable task to test the effects of invasion on recipient riparian vegetation communities. Beaver engineering activities ...
... impacts on environmental factors and thus on assembly rules of host communities. Further, the subantarctic forests of the Fuegian Archipelago are relatively simple, making it a manageable task to test the effects of invasion on recipient riparian vegetation communities. Beaver engineering activities ...
Detecting the influence of climatic variables on species distributions
... organisms with which to study the effects of climatic– environmental characteristics on the distributions of species. Their thermal ecology, physiology, and behaviour are generally highly dependent upon environmental conditions, and for temperate-zone amphibians, which generally rely on aquatic habi ...
... organisms with which to study the effects of climatic– environmental characteristics on the distributions of species. Their thermal ecology, physiology, and behaviour are generally highly dependent upon environmental conditions, and for temperate-zone amphibians, which generally rely on aquatic habi ...
A hierarchical model of whole assemblage island biogeography
... containing 41 species. For many of these species, Mayr and Diamond (2001) also delineated multiple subspecies. However, recent molecular work suggests that this classification underestimates the diversity of the system, some subspecies represent more significant evolutionary units (Moyle et al. 2005 ...
... containing 41 species. For many of these species, Mayr and Diamond (2001) also delineated multiple subspecies. However, recent molecular work suggests that this classification underestimates the diversity of the system, some subspecies represent more significant evolutionary units (Moyle et al. 2005 ...
International Rock Gardener - the Scottish Rock Garden Club
... Modern technologies and research work on a genetic level have radically changed our knowledge about the relationships between various species and their evolutionary development. Many taxa previously regarded as close relatives turned out to be very distant and vice versa. Great changes have affected ...
... Modern technologies and research work on a genetic level have radically changed our knowledge about the relationships between various species and their evolutionary development. Many taxa previously regarded as close relatives turned out to be very distant and vice versa. Great changes have affected ...
impact breeding bird diversity?
... negatively impacted by invasions of leafy spurge (Euphorbia esula) and crested wheatgrass (Agropyron cristatum) (Wilcox & Beck, 2007). This research shows that there may be a direct correlation between the introduction of an invasive plant and a ...
... negatively impacted by invasions of leafy spurge (Euphorbia esula) and crested wheatgrass (Agropyron cristatum) (Wilcox & Beck, 2007). This research shows that there may be a direct correlation between the introduction of an invasive plant and a ...
Introduced species
An introduced, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its native distributional range, which has arrived there by human activity, either deliberate or accidental. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are called invasive species. Some have a negative effect on a local ecosystem. Some introduced species may have no negative effect or only minor impact. Some species have been introduced intentionally to combat pests. They are called biocontrols and may be regarded as beneficial as an alternative to pesticides in agriculture for example. In some instances the potential for being beneficial or detrimental in the long run remains unknown. A list of some introduced species is given in a separate article.The effects of introduced species on natural environments have gained much scrutiny from scientists, governments, farmers and others.