Species Preservation
... of the various components of biological diversity. Supply one specific example of each type of diversity in your explanation. THINK: biological diversity genetic diversity species richness ecosystem diversity ...
... of the various components of biological diversity. Supply one specific example of each type of diversity in your explanation. THINK: biological diversity genetic diversity species richness ecosystem diversity ...
S33-4 Extinction by hybridization and introgression in anatine ducks
... 5 Solving the problem Helbig et al. (2002) discuss the taxonomic implications of hybridization due to secondary contact, suggesting that taxa should be considered as separate species if the level of divergence between them indicates that they will remain distinct. The example given is the ruddy duck ...
... 5 Solving the problem Helbig et al. (2002) discuss the taxonomic implications of hybridization due to secondary contact, suggesting that taxa should be considered as separate species if the level of divergence between them indicates that they will remain distinct. The example given is the ruddy duck ...
The poverty of the protists
... selection, with one mutation after another sweeping through the population. This kind of selection experiment is particularly valuable because it allows the mechanism of adaptation to be studied directly, and in the last 20 years it has enabled us to discover a great deal about how bacteria adapt to ...
... selection, with one mutation after another sweeping through the population. This kind of selection experiment is particularly valuable because it allows the mechanism of adaptation to be studied directly, and in the last 20 years it has enabled us to discover a great deal about how bacteria adapt to ...
The role of ecological interactions in determining species
... questioned because of accumulating evidence showing that predictions need to take account of ecological interactions with co-occurring resource, competitor, mutualist or natural enemy species (Araújo & Luoto, 2007; Tylianakis et al., 2008; Van der Putten, Macel & Visser, 2010; Wisz et al., 2013; Sve ...
... questioned because of accumulating evidence showing that predictions need to take account of ecological interactions with co-occurring resource, competitor, mutualist or natural enemy species (Araújo & Luoto, 2007; Tylianakis et al., 2008; Van der Putten, Macel & Visser, 2010; Wisz et al., 2013; Sve ...
SPECIES-AREA RELATIONSHIPS SPECIES-AREA REL.ATIONSHIPS
... remove species, then a species-area relationship will result (McGuinness 1984a). This hypothesis assumes that small islands are more vulnerable to disturbance, and that species richness increases as disturbance frequency decreases. Like the MacArthur and Wilson (1967) model, the disturbance hypothes ...
... remove species, then a species-area relationship will result (McGuinness 1984a). This hypothesis assumes that small islands are more vulnerable to disturbance, and that species richness increases as disturbance frequency decreases. Like the MacArthur and Wilson (1967) model, the disturbance hypothes ...
Supervisor Title - BC Public Service
... Willingness to be physically fit as the position requires extensive field work which involves strenuous walking and field evaluations in difficult terrain and under all weather conditions. ...
... Willingness to be physically fit as the position requires extensive field work which involves strenuous walking and field evaluations in difficult terrain and under all weather conditions. ...
assessment
... This species is associated with a range of vegetation communities from montane forest at high altitudes to wet and dry forest at moderate to low altitudes, respectively (Gillespie and Hollis 1996). The extent of riparian forest at known localities ranges from virtually non-existent, with scattered r ...
... This species is associated with a range of vegetation communities from montane forest at high altitudes to wet and dry forest at moderate to low altitudes, respectively (Gillespie and Hollis 1996). The extent of riparian forest at known localities ranges from virtually non-existent, with scattered r ...
UNIVERSITY HIGH SCHOOL
... 75. Ecological succession is the changes in species that occupy an area after a disturbance. What is the difference between primary succession and secondary succession? [Provide an example of each type of succession, listing the organisms that would be present throughout the process.] ...
... 75. Ecological succession is the changes in species that occupy an area after a disturbance. What is the difference between primary succession and secondary succession? [Provide an example of each type of succession, listing the organisms that would be present throughout the process.] ...
ASSESSING RISKS TO BIODIVERSITY FROM FUTURE
... Raymond (1991). For species for which there were no reported values, we used phylogenetic criteria to estimate the area requirements. We searched for published references on other species of the same genus, using the single range or average of ranges, depending on the availability of data. For birds ...
... Raymond (1991). For species for which there were no reported values, we used phylogenetic criteria to estimate the area requirements. We searched for published references on other species of the same genus, using the single range or average of ranges, depending on the availability of data. For birds ...
Abstracts
... Interspecific hybridization has played a pivotal role driving both extinctions and speciation events within angiosperms. The combination of interspecific hybridization and allopolyploidy has significantly contributed to the evolution of the genus Castilleja. The diploid Castilleja christii is a high ...
... Interspecific hybridization has played a pivotal role driving both extinctions and speciation events within angiosperms. The combination of interspecific hybridization and allopolyploidy has significantly contributed to the evolution of the genus Castilleja. The diploid Castilleja christii is a high ...
Recruitment Processes and Species Coexistence
... Japan. Data were collected in a 2±48-ha plot over six growing seasons (1989–1994). We used path analysis to analyse the relationships between the recruitment rates of saplings and the stand structural attributes such as mother tree abundance, stand crowdedness, stand stratification, Sasa bamboo dens ...
... Japan. Data were collected in a 2±48-ha plot over six growing seasons (1989–1994). We used path analysis to analyse the relationships between the recruitment rates of saplings and the stand structural attributes such as mother tree abundance, stand crowdedness, stand stratification, Sasa bamboo dens ...
What are ecological communities?
... Firstly, the various crop species in the mixture can be chosen so that they do not compete strongly with each other, i.e. their niche overlap is sufficiently low. Secondly, an increase in crop performance can arise if the species are chosen so that one species modifies the environment in a positive ...
... Firstly, the various crop species in the mixture can be chosen so that they do not compete strongly with each other, i.e. their niche overlap is sufficiently low. Secondly, an increase in crop performance can arise if the species are chosen so that one species modifies the environment in a positive ...
Is the number of tree species in small tropical forest plots nonrandom?
... the rarefaction effect in tropical forest studies. For example, Denslow (1995) extrapolated the species-individual curve to infinite sampling using a Michaelis-Menten equation. Unfortunately, the abstraction of infinite stem density in small quadrats may be biologically untenable. An alternative app ...
... the rarefaction effect in tropical forest studies. For example, Denslow (1995) extrapolated the species-individual curve to infinite sampling using a Michaelis-Menten equation. Unfortunately, the abstraction of infinite stem density in small quadrats may be biologically untenable. An alternative app ...
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 ...
SPECIAL-STATUS SPECIES BIOLOGY AND LIKELIHOOD OF
... Specific factors substantially affect likelihood of occurrence for individual species on any particular study area. These factors are relevant at multiple scales, including regionally, locally, and within the Project study area. These factors include the presence or absence of many other particular ...
... Specific factors substantially affect likelihood of occurrence for individual species on any particular study area. These factors are relevant at multiple scales, including regionally, locally, and within the Project study area. These factors include the presence or absence of many other particular ...
Defining the Impact of NonNative Species
... The introduction of species beyond their native range as a direct or indirect result of human action (termed nonnative species here) causes changes in the ecosystems to which they are introduced. In some cases, these changes are dramatic and may result in the extinction of native species or radical ...
... The introduction of species beyond their native range as a direct or indirect result of human action (termed nonnative species here) causes changes in the ecosystems to which they are introduced. In some cases, these changes are dramatic and may result in the extinction of native species or radical ...
Markov Chain Analysis of Succession in a Rocky Subtidal Community
... Colonization. Colonization occurs when a species occupies a previously unoccupied point; it results from recruitment of larvae onto bare substrate or growth of individuals into unoccupied space. In this article, we will denote bare rock as state s (the last state in our list). Then P(colonization by ...
... Colonization. Colonization occurs when a species occupies a previously unoccupied point; it results from recruitment of larvae onto bare substrate or growth of individuals into unoccupied space. In this article, we will denote bare rock as state s (the last state in our list). Then P(colonization by ...
Are invasive species a major cause of extinctions?
... Resources (IUCN) Red List [8] for species threatened worldwide. We examined these two sources to evaluate some of the widespread assumptions about invasion and extinction. Generalizing from available information on threats These and other similar data sets are invaluable assets in efforts to begin t ...
... Resources (IUCN) Red List [8] for species threatened worldwide. We examined these two sources to evaluate some of the widespread assumptions about invasion and extinction. Generalizing from available information on threats These and other similar data sets are invaluable assets in efforts to begin t ...
Influence of sea temperature, substratum and wave exposure on
... analyses of data for biomass of 310 species on 12 rocky shores. The Cape of Good Hope forms an overlap area between the south and west coast intertidal biota of South Africa (Stephenson. 1939)and species composition was found to be largely influenced by temperature regime, species richness being gre ...
... analyses of data for biomass of 310 species on 12 rocky shores. The Cape of Good Hope forms an overlap area between the south and west coast intertidal biota of South Africa (Stephenson. 1939)and species composition was found to be largely influenced by temperature regime, species richness being gre ...
The Gray Zone: Relationships between habitat loss and marine
... but in many cases the loss is a gradual transition from a more complex to a less complex habitat (i.e., a change from canopy-forming to turf forming algae). We explore the multiple ways habitat loss affects marine species diversity, and propose a conceptual model that identifies the main interactions ...
... but in many cases the loss is a gradual transition from a more complex to a less complex habitat (i.e., a change from canopy-forming to turf forming algae). We explore the multiple ways habitat loss affects marine species diversity, and propose a conceptual model that identifies the main interactions ...
Terrestrial Ecosystem Responses to Biotic Interchange
... into this century (2, 3). Human migration and global change have also facilitated the spread of a ...
... into this century (2, 3). Human migration and global change have also facilitated the spread of a ...
The Implications of Niche Construction and Ecosystem
... if it is possible to predict which species will be important ecosystem engineers in which ecosystems (see also Crain and Bertness 2006, Wright and Jones 2006). Similarly, Odling-Smee and colleagues (2003) state,“Conservation efforts may be most effective if they ensure the survival of the key engine ...
... if it is possible to predict which species will be important ecosystem engineers in which ecosystems (see also Crain and Bertness 2006, Wright and Jones 2006). Similarly, Odling-Smee and colleagues (2003) state,“Conservation efforts may be most effective if they ensure the survival of the key engine ...
Latitudinal gradients in biotic niche breadth vary
... Figure 1. (a) We show the known scaling relationship between link density (links per species) and species richness. This scaling relationship is a power law and therefore linear in a log – log plot. (b) We show two versions of the latitudinal – niche breadth hypothesis that have been proposed to exp ...
... Figure 1. (a) We show the known scaling relationship between link density (links per species) and species richness. This scaling relationship is a power law and therefore linear in a log – log plot. (b) We show two versions of the latitudinal – niche breadth hypothesis that have been proposed to exp ...
Strong density- and diversity-related effects help to maintain tree
... BCI plot was examined sequentially at four scales: 5000 square quadrats, 10 m on a side; 1250 quadrats, 20 m on a side; 200 quadrats, 50 m on a side; and finally, 50 quadrats, 100 m on a side. For each quadrat at each scale, nonparametric Spearman rank-order correlations were obtained between basal ...
... BCI plot was examined sequentially at four scales: 5000 square quadrats, 10 m on a side; 1250 quadrats, 20 m on a side; 200 quadrats, 50 m on a side; and finally, 50 quadrats, 100 m on a side. For each quadrat at each scale, nonparametric Spearman rank-order correlations were obtained between basal ...
View PDF - CiteSeerX
... eses, the factors included in the model, whether their effect was expected to be positive or negative, and the references from which the model was derived. To predict the abundance of embryos we chose models that included both aquatic and terrestrial variables. Models for larval abundance were set u ...
... eses, the factors included in the model, whether their effect was expected to be positive or negative, and the references from which the model was derived. To predict the abundance of embryos we chose models that included both aquatic and terrestrial variables. Models for larval abundance were set u ...