![Role and consequences of fish diversity in the functioning of African](http://s1.studyres.com/store/data/014622959_1-7f272385cbe5f85df7249044c78107f5-300x300.png)
Role and consequences of fish diversity in the functioning of African
... that may be relevant for that purpose, while some major ecological questions have been identified. The top-down view argues that the effects of fish predation cascade down the trophic chain and are responsible for controlling the state of the entire ecosystem. The influence of fish predation on prey ...
... that may be relevant for that purpose, while some major ecological questions have been identified. The top-down view argues that the effects of fish predation cascade down the trophic chain and are responsible for controlling the state of the entire ecosystem. The influence of fish predation on prey ...
ppt
... “The demonstration of nonrandom spatial association of species with habitats is a necessary but not sufficient criterion in demonstrating that habitat partitioning is important in enabling many species to coexist…” “However, to be able to show that co-occurring species in different habitats are more ...
... “The demonstration of nonrandom spatial association of species with habitats is a necessary but not sufficient criterion in demonstrating that habitat partitioning is important in enabling many species to coexist…” “However, to be able to show that co-occurring species in different habitats are more ...
How many parasites? - Princeton University
... and helminths are not the most fully described parasite taxa. How Many Species Are There on Earth? Beginning in 1988, Robert May (2, 3, 9) cogently argued that our inability to estimate the diversity of species on Earth provided a sad and somewhat self-centered testimony to human inquisitiveness. Af ...
... and helminths are not the most fully described parasite taxa. How Many Species Are There on Earth? Beginning in 1988, Robert May (2, 3, 9) cogently argued that our inability to estimate the diversity of species on Earth provided a sad and somewhat self-centered testimony to human inquisitiveness. Af ...
- WIT Repository
... effect of variation in relative abundance can be isolated by exploring the diversity effect ...
... effect of variation in relative abundance can be isolated by exploring the diversity effect ...
Gilliam FS and MR Roberts. 2003. The dynamic nature of the
... Clearly, the most spatially and temporally variable component of the environment of the forest floor is light availability. The light environment to which herb layer species are exposed varies at many levels of scale over space and through time. Accordingly, we refer to this environment as a dynamic ...
... Clearly, the most spatially and temporally variable component of the environment of the forest floor is light availability. The light environment to which herb layer species are exposed varies at many levels of scale over space and through time. Accordingly, we refer to this environment as a dynamic ...
COMMENTARY On the Diversity of Nature and the Nature of Diversity
... However, the scope ofthese efforts is limited. The Endangered Species Act, for example, protects critical habitats, primarily on u.s. federal property. Of the 485 species listed as endangered or threatened in the United States, nearly half are plants; only 15 are insects. Yet the total of U.S. flora ...
... However, the scope ofthese efforts is limited. The Endangered Species Act, for example, protects critical habitats, primarily on u.s. federal property. Of the 485 species listed as endangered or threatened in the United States, nearly half are plants; only 15 are insects. Yet the total of U.S. flora ...
Testing macroecology models with stream-fish assemblages Nicholas J. Gotelli
... little concordance between the patterns in the Cimarron data (Fig. 2) and the original predictions of Brown and Maurer (1987). The exception is the relationship between body size and area of geographic range (Fig. 2b), which displays the triangle-shape also found in the North American avifauna. Brow ...
... little concordance between the patterns in the Cimarron data (Fig. 2) and the original predictions of Brown and Maurer (1987). The exception is the relationship between body size and area of geographic range (Fig. 2b), which displays the triangle-shape also found in the North American avifauna. Brow ...
"Species Richness: Small Scale". In: Encyclopedia of Life Sciences
... (Grace and Jutila, 1999). Where productivity is very low few species can persist, and where productivity is very high a small number seem to win at competition, but at intermediate levels many coexist. Peet and Christensen (1988) suggested that the mechanism for the unimodal relationship between pro ...
... (Grace and Jutila, 1999). Where productivity is very low few species can persist, and where productivity is very high a small number seem to win at competition, but at intermediate levels many coexist. Peet and Christensen (1988) suggested that the mechanism for the unimodal relationship between pro ...
УДК 635
... structure of urban ecosystems’ greenery of Forest-Steppe zone of Ukraine we have clarified their taxonomic composition. Decorative floral plants in the structure of urban flora are presented by 118 species from 58 genera 31 families 16 orders of 2 classes. Dicotyledones class dominates in terms of q ...
... structure of urban ecosystems’ greenery of Forest-Steppe zone of Ukraine we have clarified their taxonomic composition. Decorative floral plants in the structure of urban flora are presented by 118 species from 58 genera 31 families 16 orders of 2 classes. Dicotyledones class dominates in terms of q ...
by Rafe M. Brown, Renato Boying Fernandez, Chrisostomo Rivero
... n the past several hundred years, as the forests of the Bicol Region have been almost completely felled, the tremendous economic and social importance of the montane forests of Mt. Isarog (Camarines Sur and Norte Provinces) has become abundantly clear to the surrounding human population. At the same ...
... n the past several hundred years, as the forests of the Bicol Region have been almost completely felled, the tremendous economic and social importance of the montane forests of Mt. Isarog (Camarines Sur and Norte Provinces) has become abundantly clear to the surrounding human population. At the same ...
An Ecolab Perspective on the Bedau Evolutionary Statistics
... As mentioned in section , the mutation operator is highly conservative with respect to connectivity. It assumes that a new species inherits the same connections as its parent, with random additions or deletions according to a symmetric distribution (just as likely to gain a connection as lose one). ...
... As mentioned in section , the mutation operator is highly conservative with respect to connectivity. It assumes that a new species inherits the same connections as its parent, with random additions or deletions according to a symmetric distribution (just as likely to gain a connection as lose one). ...
The effect of grazing on biodiversity in the grassland biome
... and -trophic levels. However, a rapid assessment approach is crucial to assess the current level of biodiversity, overlapping between all aspects (plants, invertebrates, etc.). It is also important to determine what constitutes adequate biodiversity conservation. For current systems, we need to know ...
... and -trophic levels. However, a rapid assessment approach is crucial to assess the current level of biodiversity, overlapping between all aspects (plants, invertebrates, etc.). It is also important to determine what constitutes adequate biodiversity conservation. For current systems, we need to know ...
Community Maturity, Species Saturation and the Variant Diversity
... whether seeding treatments altered diversity–productivity relations of resident species. We first modelled resident productivity as a function of resident diversity considering each of the functional forms described above except for the ANOVA model, and pooling across all treatments by site and year ...
... whether seeding treatments altered diversity–productivity relations of resident species. We first modelled resident productivity as a function of resident diversity considering each of the functional forms described above except for the ANOVA model, and pooling across all treatments by site and year ...
ORIGIN, BIOGEOGRAPHICAL MIGRATIONS AND
... thought to have been influenced by shifting positions of land masses (27) and seas that created and even destroyed environments where the ancestral grasses originated or migrated. Plate tectonic theory has been advanced by new geological evidence and contributes to concepts of angiospermPoaceae dist ...
... thought to have been influenced by shifting positions of land masses (27) and seas that created and even destroyed environments where the ancestral grasses originated or migrated. Plate tectonic theory has been advanced by new geological evidence and contributes to concepts of angiospermPoaceae dist ...
Phylogenetic position of Mexican jackrabbits within the genus Lepus
... Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Apartado postal 70-275, 04510 México, D.F., México. ...
... Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Apartado postal 70-275, 04510 México, D.F., México. ...
Anthropogenic impacts on tropical forest biodiversity
... activities such as habitat destruction and fragmentation (land-use change), invasive species and over-exploitation, as well as indirect effects of human activities such as climate change (Millennium Ecosystem Assessment 2005). The relative impacts of these threats vary among the world’s major tropic ...
... activities such as habitat destruction and fragmentation (land-use change), invasive species and over-exploitation, as well as indirect effects of human activities such as climate change (Millennium Ecosystem Assessment 2005). The relative impacts of these threats vary among the world’s major tropic ...
Phylogenetic diversity promotes ecosystem stability
... 1991), then the simplest models of evolutionary change predict that the more distantly related two species are, the greater likelihood that they differ ecologically. Of course, individual traits may show idiosyncratic patterns and rates of evolution, but overall ecological differentiation, across a ...
... 1991), then the simplest models of evolutionary change predict that the more distantly related two species are, the greater likelihood that they differ ecologically. Of course, individual traits may show idiosyncratic patterns and rates of evolution, but overall ecological differentiation, across a ...
Invasibility of tropical islands by introduced plants
... be less susceptible to invasion than others (Lonsdale 1999), and islands are generally more susceptible to invasion than mainlands (Lonsdale 1999, Denslow 2003). In regional studies, the number of non-native species naturalized in an area is commonly used as a measure of invasibility. Larger areas m ...
... be less susceptible to invasion than others (Lonsdale 1999), and islands are generally more susceptible to invasion than mainlands (Lonsdale 1999, Denslow 2003). In regional studies, the number of non-native species naturalized in an area is commonly used as a measure of invasibility. Larger areas m ...
Chapter 11 The Origins of the Genus Homo
... continue to insist there are two species Who were the earliest African emigrants? o The original hypothesis was that Homo erectus evolved in Africa and then quickly migrated out to Asia and Europe. There is new evidence that muddies this hypothesis o These discoveries are leading to questions about ...
... continue to insist there are two species Who were the earliest African emigrants? o The original hypothesis was that Homo erectus evolved in Africa and then quickly migrated out to Asia and Europe. There is new evidence that muddies this hypothesis o These discoveries are leading to questions about ...
Chapter 5 Overview of Living Primates
... Color vision is a characteristic of all diurnal primates, nocturnal primates lack color vision. Depth perception is made possible by eyes positioned forward on the front of the face. Decreased reliance on the sense of smell. The brain has expanded in size and become ...
... Color vision is a characteristic of all diurnal primates, nocturnal primates lack color vision. Depth perception is made possible by eyes positioned forward on the front of the face. Decreased reliance on the sense of smell. The brain has expanded in size and become ...
Trends in the extinction of carnivores in Madagascar B. Cartagena
... Madagascar is one of twenty–five global biodiversity hotspots, harbouring almost 3% of the world’s endemic vertebrates (Myers et al., 2000). Since all Malagasy native terrestrial mammalian carnivores are endemic (Yoder et al., 2003; Duckworth et al., 2014), their extinction would represent a signifi ...
... Madagascar is one of twenty–five global biodiversity hotspots, harbouring almost 3% of the world’s endemic vertebrates (Myers et al., 2000). Since all Malagasy native terrestrial mammalian carnivores are endemic (Yoder et al., 2003; Duckworth et al., 2014), their extinction would represent a signifi ...
Global patterns and predictors of marine biodiversity across
... diversity patterns and processes at regional to global scales3. Whereas land diversity patterns and their predictors are known for numerous taxa4,5, our understanding of global marine diversity has been more limited, with recent findings revealing some striking contrasts to widely held terrestrial p ...
... diversity patterns and processes at regional to global scales3. Whereas land diversity patterns and their predictors are known for numerous taxa4,5, our understanding of global marine diversity has been more limited, with recent findings revealing some striking contrasts to widely held terrestrial p ...
Activity (Teacher Verison) PDF
... species still exists, fossil remains show that, at one time, there were actually several species. It’s not known whether this was the result of multiple introductions or a single introduction that radiated into multiple species. The existing Hawaiian crow, called ‘alalä, is unique among the world’s ...
... species still exists, fossil remains show that, at one time, there were actually several species. It’s not known whether this was the result of multiple introductions or a single introduction that radiated into multiple species. The existing Hawaiian crow, called ‘alalä, is unique among the world’s ...
Temporal stability of European rocky shore assemblages
... the mechanisms promoting stability (Table 1). Species fluctuations can be synchronous at some timescales, but not at others, so that long time-series enabling partitioning at varying scales are of paramount importance to identify discontinuities (Vasseur and Gaedke 2007, Downing et al. 2008, Keitt 2 ...
... the mechanisms promoting stability (Table 1). Species fluctuations can be synchronous at some timescales, but not at others, so that long time-series enabling partitioning at varying scales are of paramount importance to identify discontinuities (Vasseur and Gaedke 2007, Downing et al. 2008, Keitt 2 ...
CAML/SCAR – MarBIN Biogeographic Atlas of the Southern Ocean
... buccinoidean gastropods and ctenocidarine echinoids (Briggs 2003; Pearse & Lockhart 2004) but the ultimate origins of all these groups is still uncertain (see also, below). The OTT model has served to reinforce the concept of the tropics as a macroevolutionary source and the poles as corresponding ...
... buccinoidean gastropods and ctenocidarine echinoids (Briggs 2003; Pearse & Lockhart 2004) but the ultimate origins of all these groups is still uncertain (see also, below). The OTT model has served to reinforce the concept of the tropics as a macroevolutionary source and the poles as corresponding ...
Fauna of Africa
![](https://commons.wikimedia.org/wiki/Special:FilePath/Hyenas_at_stolen_impala_kill.jpg?width=300)
Fauna of Africa, in its broader sense, is all the animals living in Africa and its surrounding seas and islands. The more characteristic African fauna is found in the Afrotropical ecoregion. Lying almost entirely within the tropics, and equally to north and south of the equator creates favourable conditions for rich wildlife.