AN ECOLOGICAL OVERVIEW OF POECILIID FISHES Gary K. Meffe
... 1936; Hess and Tarzwell 1942; Hunt 1953; Reimer 1970; Harrington and Harrington 1961; Schoenherr 1974; Dussault and Kramer 1981). The diets of poeciliids are often reflected in morphology. Tooth structure and gut length relative to body size are good indicators of diet preference (Al-Hussaini 1949; ...
... 1936; Hess and Tarzwell 1942; Hunt 1953; Reimer 1970; Harrington and Harrington 1961; Schoenherr 1974; Dussault and Kramer 1981). The diets of poeciliids are often reflected in morphology. Tooth structure and gut length relative to body size are good indicators of diet preference (Al-Hussaini 1949; ...
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... detected may not b e caused by pollution, a n d any subsequent predictions or management based on it may fail. The second area of research (EVALUATION) is one of the main purposes of the workshop - to determine which methods might be considered best for various purposes. The primary Issue is to asse ...
... detected may not b e caused by pollution, a n d any subsequent predictions or management based on it may fail. The second area of research (EVALUATION) is one of the main purposes of the workshop - to determine which methods might be considered best for various purposes. The primary Issue is to asse ...
Cheetah - Panthera.org
... illegal trade in live cubs and adults, many of which die during transport. ...
... illegal trade in live cubs and adults, many of which die during transport. ...
Dominant Species and Diversity: Linking Relative Abundance to
... Schwartz et al. 2000; Fridley et al. 2007). These studies have shown that although some ecological communities can competitively inhibit establishment of new species, other communities facilitate the establishment of new species (Smith et al. 2004; Brooker et al. 2008). Furthermore, it is not clear ...
... Schwartz et al. 2000; Fridley et al. 2007). These studies have shown that although some ecological communities can competitively inhibit establishment of new species, other communities facilitate the establishment of new species (Smith et al. 2004; Brooker et al. 2008). Furthermore, it is not clear ...
EnvSci Ch5 PPT
... • Secondary succession can occur in ecosystems that have been disturbed or disrupted by humans, animals, or by natural process such as storms, floods, earthquakes, or volcanic eruptions. ...
... • Secondary succession can occur in ecosystems that have been disturbed or disrupted by humans, animals, or by natural process such as storms, floods, earthquakes, or volcanic eruptions. ...
Sensitivity of copepod populations to bottom-up and top
... The spatio-temporal variability of marine copepods, like other aquatic and terrestrial organisms, is controlled by both bottom-up (through changes in food resource) and top-down (through changes in predation) forcing. Canonically, climate-related changes in hydrography, nutrient chemistry and circul ...
... The spatio-temporal variability of marine copepods, like other aquatic and terrestrial organisms, is controlled by both bottom-up (through changes in food resource) and top-down (through changes in predation) forcing. Canonically, climate-related changes in hydrography, nutrient chemistry and circul ...
vertical and horizontal habitats of fruit
... Abstract. Continental islands harbor only fractions of mainland biota, which has potentially important consequences for the ecological processes affecting community structure. We assessed for the first time abundance, species richness, and vertical and horizontal niches of fruit-feeding butterflies ...
... Abstract. Continental islands harbor only fractions of mainland biota, which has potentially important consequences for the ecological processes affecting community structure. We assessed for the first time abundance, species richness, and vertical and horizontal niches of fruit-feeding butterflies ...
Trophic Organization of Fishes in a Coastal
... 1976a). This analysis was done in conjunction with notations concerning the frequency of 'empty' stomachs so that sampling effort could be established on a n empirical basis. It was found that 7 to 15 individuals (depending on species) were adequate for 90 % food item representation. Combined sample ...
... 1976a). This analysis was done in conjunction with notations concerning the frequency of 'empty' stomachs so that sampling effort could be established on a n empirical basis. It was found that 7 to 15 individuals (depending on species) were adequate for 90 % food item representation. Combined sample ...
File
... • Secondary succession can occur in ecosystems that have been disturbed or disrupted by humans, animals, or by natural process such as storms, floods, earthquakes, or volcanic eruptions. ...
... • Secondary succession can occur in ecosystems that have been disturbed or disrupted by humans, animals, or by natural process such as storms, floods, earthquakes, or volcanic eruptions. ...
Symbiotic fungal endophytes control insect host±parasite interaction
... transfer to consumers as a result of low plant quality, rather than low productivity. Herbivore±parasite webs on endophytefree grasses show enhanced insect abundance at alternate trophic levels, higher rates of parasitism, and increased dominance by a few trophic links. These results mirror predicte ...
... transfer to consumers as a result of low plant quality, rather than low productivity. Herbivore±parasite webs on endophytefree grasses show enhanced insect abundance at alternate trophic levels, higher rates of parasitism, and increased dominance by a few trophic links. These results mirror predicte ...
Observations - Seattle Central College
... If predictions are incorrect, we reject the hypothesis ...
... If predictions are incorrect, we reject the hypothesis ...
Urban Systems - Stockholm Resilience Centre
... in predation rates have been suggested to be among the most important. Predation on artificial nests has often been found to be higher in urban parks than in neighboring woodlands and the abundance of predators such as corvids, rats, and house mice are often more in urban parks compared to the rural ...
... in predation rates have been suggested to be among the most important. Predation on artificial nests has often been found to be higher in urban parks than in neighboring woodlands and the abundance of predators such as corvids, rats, and house mice are often more in urban parks compared to the rural ...
Progress report on the Turing-inspired Meta
... 3-D structures, including many found in living forms.6 I suspect that if Turing had lived on he would have tried to understand forms of information processing needed to control behaviour of increasingly complex organisms. Controlled production of complex behaving structures needs increasingly sophis ...
... 3-D structures, including many found in living forms.6 I suspect that if Turing had lived on he would have tried to understand forms of information processing needed to control behaviour of increasingly complex organisms. Controlled production of complex behaving structures needs increasingly sophis ...
AND Gehyra variegata) IN REMNANT HABITAT
... lands and to cope with the changes in their habitat. These changes include a reduction in the area of available habitat, changed spatial relationships of habitat, increased fluxes of solar radiation, wind and water and the disruption of ecological processes such as nutrient cycling, energy transfer, ...
... lands and to cope with the changes in their habitat. These changes include a reduction in the area of available habitat, changed spatial relationships of habitat, increased fluxes of solar radiation, wind and water and the disruption of ecological processes such as nutrient cycling, energy transfer, ...
FOOD CHAINS
... no ecosystem on Earth is truly independent. Global weather patterns affect many ecosystems at once, as do broad changes to the environment. Also, many species move from one ecosystem to another, which makes relationships within ecosystems fluid and dynamic. A snapshot of a food web today may be diff ...
... no ecosystem on Earth is truly independent. Global weather patterns affect many ecosystems at once, as do broad changes to the environment. Also, many species move from one ecosystem to another, which makes relationships within ecosystems fluid and dynamic. A snapshot of a food web today may be diff ...
Contributions of a global network of tree diversity
... both monoculture and mixtures, and that tree diversity levels are replicated in a randomized design, allowing for the effects of diversity to be tested. Tree diversity experiments can yield reliable estimates of ecosystem functioning as the experimental design controls the levels and range of tree d ...
... both monoculture and mixtures, and that tree diversity levels are replicated in a randomized design, allowing for the effects of diversity to be tested. Tree diversity experiments can yield reliable estimates of ecosystem functioning as the experimental design controls the levels and range of tree d ...
A new parameterization for estimating co
... Abstract. Models currently used to estimate patterns of species co-occurrence while accounting for errors in detection of species can be difficult to fit when the effects of covariates on species occurrence probabilities are included. The source of the estimation problems is the particular parameteriz ...
... Abstract. Models currently used to estimate patterns of species co-occurrence while accounting for errors in detection of species can be difficult to fit when the effects of covariates on species occurrence probabilities are included. The source of the estimation problems is the particular parameteriz ...
Genetic identity of interspecific neighbours mediates plant
... (Chanway et al. 1990; Luscher et al. 1992; Expert et al. 1997) have not undermined the basic recognition that these plants exhibit fine-scale adaptations to their local biotic environment (Turkington 1996). However, evidence for this phenomenon in other systems remains scarce (but see Kelley & Clay ...
... (Chanway et al. 1990; Luscher et al. 1992; Expert et al. 1997) have not undermined the basic recognition that these plants exhibit fine-scale adaptations to their local biotic environment (Turkington 1996). However, evidence for this phenomenon in other systems remains scarce (but see Kelley & Clay ...
Altitudinal zonation among lizards of the genus
... lemniscatus regardless of its small body size, and that at the higher elevation they took the largest lizard (L. leopardinus) regardless of its microhabitat use. This study indicates that predation is not a continuous variable that, say, decreases with elevation. Predators seem to take their cues in ...
... lemniscatus regardless of its small body size, and that at the higher elevation they took the largest lizard (L. leopardinus) regardless of its microhabitat use. This study indicates that predation is not a continuous variable that, say, decreases with elevation. Predators seem to take their cues in ...
The Demographic Basis of Population Regulation in Columbian
... changes in a demographic parameter with its actual contribution to population change can indicate which demographic parameters have considerable environmental scope and which do not, under specific environmental circumstances (Oli et al. 2001). These demographic techniques, while informative, might ...
... changes in a demographic parameter with its actual contribution to population change can indicate which demographic parameters have considerable environmental scope and which do not, under specific environmental circumstances (Oli et al. 2001). These demographic techniques, while informative, might ...
i.e. Mayfield and Levine 2010
... the determinants of coexistence could be explicitly decomposed into niche and competitive ability differences. In the absence of niche differences, the species that is the best competitor, on average, displaces the others. ChessonÕs framework for niche and competitive ability differences is most use ...
... the determinants of coexistence could be explicitly decomposed into niche and competitive ability differences. In the absence of niche differences, the species that is the best competitor, on average, displaces the others. ChessonÕs framework for niche and competitive ability differences is most use ...
THE IMPLICATIONS OF INTRAGUILD PREDATION FOR THE ROLE
... assemblages of several species. Other evidence finds that spiders prey on each other and other generalist predators, and as such are of limited value in biological control. Such predatory interactions between species which use similar resources have been dubbed intraguild predation (IGP) due to thei ...
... assemblages of several species. Other evidence finds that spiders prey on each other and other generalist predators, and as such are of limited value in biological control. Such predatory interactions between species which use similar resources have been dubbed intraguild predation (IGP) due to thei ...
Theoretical ecology
Theoretical ecology is the scientific discipline devoted to the study of ecological systems using theoretical methods such as simple conceptual models, mathematical models, computational simulations, and advanced data analysis. Effective models improve understanding of the natural world by revealing how the dynamics of species populations are often based on fundamental biological conditions and processes. Further, the field aims to unify a diverse range of empirical observations by assuming that common, mechanistic processes generate observable phenomena across species and ecological environments. Based on biologically realistic assumptions, theoretical ecologists are able to uncover novel, non-intuitive insights about natural processes. Theoretical results are often verified by empirical and observational studies, revealing the power of theoretical methods in both predicting and understanding the noisy, diverse biological world.The field is broad and includes foundations in applied mathematics, computer science, biology, statistical physics, genetics, chemistry, evolution, and conservation biology. Theoretical ecology aims to explain a diverse range of phenomena in the life sciences, such as population growth and dynamics, fisheries, competition, evolutionary theory, epidemiology, animal behavior and group dynamics, food webs, ecosystems, spatial ecology, and the effects of climate change.Theoretical ecology has further benefited from the advent of fast computing power, allowing the analysis and visualization of large-scale computational simulations of ecological phenomena. Importantly, these modern tools provide quantitative predictions about the effects of human induced environmental change on a diverse variety of ecological phenomena, such as: species invasions, climate change, the effect of fishing and hunting on food network stability, and the global carbon cycle.