preliminary ecological survey for the proposed luiperdshoek
... Bioregion is separated from other bioregions within the Nama Karoo Biome by having low mean precipitation and high mean temperatures. The vegetation is dominated by arid shrublands and grasslands. The study area is located within the arid region of South Africa and annually receives between 45-80mm ...
... Bioregion is separated from other bioregions within the Nama Karoo Biome by having low mean precipitation and high mean temperatures. The vegetation is dominated by arid shrublands and grasslands. The study area is located within the arid region of South Africa and annually receives between 45-80mm ...
Functional redundancy in ecology and conservation
... function of both per capita effects and abundance (dominance). The aggregate functional effects of a species within a trophic level or community will be the per capita rate multiplied by organism abundance. It is important to distinguish between functional equivalency in terms of per capita impacts, ...
... function of both per capita effects and abundance (dominance). The aggregate functional effects of a species within a trophic level or community will be the per capita rate multiplied by organism abundance. It is important to distinguish between functional equivalency in terms of per capita impacts, ...
Lady Beetles, Buckthorn, and Bees
... 1. Determine how the group of egg predators varies by exotic and native lady beetle species and by foraging habitat. 2. Learn more about the guild of predators attacking eggs, have their populations changed in recent decades? 3. Examine additional competitive interactions between native and exoti ...
... 1. Determine how the group of egg predators varies by exotic and native lady beetle species and by foraging habitat. 2. Learn more about the guild of predators attacking eggs, have their populations changed in recent decades? 3. Examine additional competitive interactions between native and exoti ...
The Ozark/Ouachitas - Partners in Flight
... Conservation efforts in the physiographic area have a proportionately greater ability to impact such species as declines or increases in areas with large percentages of a species global population have a greater effect on their global abundance than if similar rates of increase or decline occur wher ...
... Conservation efforts in the physiographic area have a proportionately greater ability to impact such species as declines or increases in areas with large percentages of a species global population have a greater effect on their global abundance than if similar rates of increase or decline occur wher ...
Emerging directions in the study of the ecology and evolution of
... network specialization) used in their study changed with landscape type (farmland, orchard, forest edge) or season. Other studies have shown that although seasonal species turnover exists in the network, general network patterns (such as nestedness, connectance and modularity) remain relatively cons ...
... network specialization) used in their study changed with landscape type (farmland, orchard, forest edge) or season. Other studies have shown that although seasonal species turnover exists in the network, general network patterns (such as nestedness, connectance and modularity) remain relatively cons ...
test bIodIversIty – why It mAtters
... The Canadian Arctic is far more diverse and has much more biomass and biodiversity than the uniform, dry and barren landscape usually associated with the far North. Biological productivity is low which means that plants and animals reproduce slowly, and it takes longer than elsewhere for their popul ...
... The Canadian Arctic is far more diverse and has much more biomass and biodiversity than the uniform, dry and barren landscape usually associated with the far North. Biological productivity is low which means that plants and animals reproduce slowly, and it takes longer than elsewhere for their popul ...
Abiotic vs. Biotic Influences on Habitat Selection of Coexisting
... Abstract. Species are commonly segregated along gradients of microclimate and vegetation. I explore the question of whether segregation is the result of microhabitat partitioning (biotic effects) or choice of differing microclimates (abiotic effects). I explored this question for four ground-nesting ...
... Abstract. Species are commonly segregated along gradients of microclimate and vegetation. I explore the question of whether segregation is the result of microhabitat partitioning (biotic effects) or choice of differing microclimates (abiotic effects). I explored this question for four ground-nesting ...
JMS 70_3 257-261 eyh028 FINAL
... Canarin in 1984–85 (R. Rossi, unpublished data); individuals of uncommon species were sometimes collected during these surveys, but never Asian date mussels. There is anecdotal evidence that shellfish farmers occasionally began to find uncommon, small greenish mussels since 1993, which we presume to ...
... Canarin in 1984–85 (R. Rossi, unpublished data); individuals of uncommon species were sometimes collected during these surveys, but never Asian date mussels. There is anecdotal evidence that shellfish farmers occasionally began to find uncommon, small greenish mussels since 1993, which we presume to ...
Node-by-node disassembly of a mutualistic interaction web driven
... Because the density of mistletoe was demonstrably lower in sites with, than in sites without exotic ungulates, and because the mistletoe is the primary source of nectar for the hummingbird during the austral winter, the density of hummingbirds should also be lower at invaded sites than at intact sit ...
... Because the density of mistletoe was demonstrably lower in sites with, than in sites without exotic ungulates, and because the mistletoe is the primary source of nectar for the hummingbird during the austral winter, the density of hummingbirds should also be lower at invaded sites than at intact sit ...
Community-wide distribution of predator–prey interaction strength in
... interaction strength may not be functionally predicted by the parameterized version of Eq. 2. The use of adult biomasses, and the fact that herbivores in experimental feeding trials were offered only a single-species prey resource, were consistent with our goal of estimating maximum per capita inter ...
... interaction strength may not be functionally predicted by the parameterized version of Eq. 2. The use of adult biomasses, and the fact that herbivores in experimental feeding trials were offered only a single-species prey resource, were consistent with our goal of estimating maximum per capita inter ...
... the San Rafael River, Utah, USA. We employ a suite of abundance comparisons, stable isotope techniques and size-at-age back-calculation analyses to compare food web structure and growth rates of the ‘three species’ in study areas with and without established populations of non-native species. We fou ...
Amphibian Monitoring
... There are two national frog and toad monitoring programs, the North American Amphibian Monitoring Program (NAAMP), coordinated by USGS and Frogwatch USA, coordinated by the National Wildlife Federation. Both programs involve volunteers in the identification of frogs and toads by their calls and voca ...
... There are two national frog and toad monitoring programs, the North American Amphibian Monitoring Program (NAAMP), coordinated by USGS and Frogwatch USA, coordinated by the National Wildlife Federation. Both programs involve volunteers in the identification of frogs and toads by their calls and voca ...
Research: “Habitats as templates for the diversification of
... Species communities within local habitat patches are assembled from the tree of life. Nevertheless, the interaction between habitats or species communities on the one hand and macroevolution along the tree of life on the other hand has hardly been studied (except for a recent trend of using phylogen ...
... Species communities within local habitat patches are assembled from the tree of life. Nevertheless, the interaction between habitats or species communities on the one hand and macroevolution along the tree of life on the other hand has hardly been studied (except for a recent trend of using phylogen ...
Chapter 1 Art Slides
... Because “Hybrid offspring” (a solid & striped cross) are less fit than “single form” offspring, the population is adapting in one other way: Individuals prefer to mate with others of the same color pattern. ...
... Because “Hybrid offspring” (a solid & striped cross) are less fit than “single form” offspring, the population is adapting in one other way: Individuals prefer to mate with others of the same color pattern. ...
Extreme life history plasticity and the evolution
... structure appears to be a flexible trait in many ant species and may be dependent on genetic (Ross and Keller 1998), nutritional (Banschbach and Herbers 1999), and social factors (Fournier et al. 2005). Furthermore, other studies demonstrate that ecological factors can cause a long-term shift in col ...
... structure appears to be a flexible trait in many ant species and may be dependent on genetic (Ross and Keller 1998), nutritional (Banschbach and Herbers 1999), and social factors (Fournier et al. 2005). Furthermore, other studies demonstrate that ecological factors can cause a long-term shift in col ...
A new formulation for determination of the competition coefficient in
... competition between species i and j. It is defined as a measure of the extent to which an individual of a species influences the growth or stability of the population of a second species, through competition, compared to the influence of an individual of the latter 9. There have been numerous models ...
... competition between species i and j. It is defined as a measure of the extent to which an individual of a species influences the growth or stability of the population of a second species, through competition, compared to the influence of an individual of the latter 9. There have been numerous models ...
DEFORESTATION PATTERNS AND HUMMINGBIRD DIvERSITy IN
... change is a modification process of the natural forest cover into fragments which generate various ecological impacts. Habitat loss is identified to be a major threat to biodiversity, as it exposes species to the risk of extinction. This study investigates 80 locations within tropical rainforest bio ...
... change is a modification process of the natural forest cover into fragments which generate various ecological impacts. Habitat loss is identified to be a major threat to biodiversity, as it exposes species to the risk of extinction. This study investigates 80 locations within tropical rainforest bio ...
Impact of argentine ants (Linepithema humile, Mayr) on saproxylic
... change has been the extensive supplantation of Afromontane forest with pine (Pinus radiata and P. pinaster) and eucalyptus plantations. These alien forests would exclude most native phytophagous insects (Fenner & Lee 2001; Tewksbury et al. 2002), but their impacts on the endemic saproxylic fauna is ...
... change has been the extensive supplantation of Afromontane forest with pine (Pinus radiata and P. pinaster) and eucalyptus plantations. These alien forests would exclude most native phytophagous insects (Fenner & Lee 2001; Tewksbury et al. 2002), but their impacts on the endemic saproxylic fauna is ...
Losing history: how extinctions prune features from the tree of life
... scenario assumed random loss of species, whereas there is growing evidence that extinctions tend to be clumped on the tree of life so that if a species is at high risk of extinction so too are its close relatives [54]. Phylogenetically non-random extinctions have been argued to result in greater tha ...
... scenario assumed random loss of species, whereas there is growing evidence that extinctions tend to be clumped on the tree of life so that if a species is at high risk of extinction so too are its close relatives [54]. Phylogenetically non-random extinctions have been argued to result in greater tha ...
species diversity
... • Habitat change hurts most organisms because they are adapted to an existing habitat. • Alteration due to: Forest clearing Urban development, Agriculture Global climate change, etc…. ...
... • Habitat change hurts most organisms because they are adapted to an existing habitat. • Alteration due to: Forest clearing Urban development, Agriculture Global climate change, etc…. ...
Draft Threatened Species Strategy
... New Zealanders have already rallied to the cause. For more than two decades, research agencies, communities, iwi, businesses and the Government have worked together to improve the odds of our national icon. The partnership between DOC and Kiwis for kiwi (which represents the non-government kiwi sect ...
... New Zealanders have already rallied to the cause. For more than two decades, research agencies, communities, iwi, businesses and the Government have worked together to improve the odds of our national icon. The partnership between DOC and Kiwis for kiwi (which represents the non-government kiwi sect ...
Demographic controls of aboveground forest biomass across North
... Figure 2 Hypothetical scenarios for how species composition and/or environmental conditions may explain variation in forest growth or mortality across space. The x-axis represents a latent environmental gradient (i.e. related to unmeasured physical factors) affecting species-level demographic perfor ...
... Figure 2 Hypothetical scenarios for how species composition and/or environmental conditions may explain variation in forest growth or mortality across space. The x-axis represents a latent environmental gradient (i.e. related to unmeasured physical factors) affecting species-level demographic perfor ...
EVOLUTION OF DIVARICATING PLANTS IN NEW ZEALAND IN
... of several different chromosome segments between unrelated families. It was however a reading of Went's (1971) statement: "One might e.g. have assumed that the extreme degree of branching, combined with microphylly, would be an adaptation against browsing animals, but New Zealand is the only extensi ...
... of several different chromosome segments between unrelated families. It was however a reading of Went's (1971) statement: "One might e.g. have assumed that the extreme degree of branching, combined with microphylly, would be an adaptation against browsing animals, but New Zealand is the only extensi ...
Bifrenaria
Bifrenaria, abbreviated Bif. in horticultural trade, is a genus of plant in family Orchidaceae. It contains 20 species found in Panama, Trinidad and South America. There are no known uses for them, but their abundant, and at first glance artificial, flowers, make them favorites of orchid growers.The genus can be split in two clearly distinct groups: one of highly robust plants with large flowers, that encompass the first species to be classified under the genus Bifrenaria; other of more delicate plants with smaller flowers occasionally classified as Stenocoryne or Adipe. There are two additional species that are normally classified as Bifrenaria, but which molecular analysis indicate to belong to different orchid groups entirely. One is Bifrenaria grandis which is endemic to Bolívia and which is now placed in Lacaena, and Bifrenaria steyermarkii, an inhabitant of the northern Amazon Forest, which does not have an alternative classification.