Allee effects, extinctions, and chaotic transients in simple population
... 1999; Stephens and Sutherland, 1999; Stephens et al., 1999; Lande et al., 2003). Population with fluctuating dynamics and a strong Allee effect are especially vulnerable to extinction as the fluctuations may drive their densities below the critical threshold. For instance, these combined effects hav ...
... 1999; Stephens and Sutherland, 1999; Stephens et al., 1999; Lande et al., 2003). Population with fluctuating dynamics and a strong Allee effect are especially vulnerable to extinction as the fluctuations may drive their densities below the critical threshold. For instance, these combined effects hav ...
MODELS OF SPATIAL SPREAD: A SYNTHESIS
... models with the simplest models. The goal is to demonstrate what the common outcomes are, and where the outcome depends on the specific model chosen from those described above. Basic result for the simple model The analysis of the simplest model (2) breaks down into two different approaches, dependi ...
... models with the simplest models. The goal is to demonstrate what the common outcomes are, and where the outcome depends on the specific model chosen from those described above. Basic result for the simple model The analysis of the simplest model (2) breaks down into two different approaches, dependi ...
are microhabitat preferences of coexisting species under selection
... determine correlations of variables with the discriminant functions. Daily survival rates were calculated for preferred vs. other nest sites. Differences in daily mortality rates between preferred vs. other nest sites were tested using program CONTRAST (Hines and Sauer 1989). To estimate the form of ...
... determine correlations of variables with the discriminant functions. Daily survival rates were calculated for preferred vs. other nest sites. Differences in daily mortality rates between preferred vs. other nest sites were tested using program CONTRAST (Hines and Sauer 1989). To estimate the form of ...
Remembering the Gulf: Changes to the marine communities on the
... example, concerning the paucity of large gastropods – relatively high species diversity, even among echinoderms, consider the overall picture of the Sea of Cortez, based on which have declined throughout the Gulf (see below). all information available from the two expeditions. The most striking exam ...
... example, concerning the paucity of large gastropods – relatively high species diversity, even among echinoderms, consider the overall picture of the Sea of Cortez, based on which have declined throughout the Gulf (see below). all information available from the two expeditions. The most striking exam ...
Invertebrate associations with submersed aquatic plants
... to have a characteristic fauna associated with it, different submersed plants do provide a specific substatum or resource that can be utilized by different types of invertebrates. For the Cladocera, many genera did not indicate affinities. Chydorus spp. dominated the cladoceran communities of all th ...
... to have a characteristic fauna associated with it, different submersed plants do provide a specific substatum or resource that can be utilized by different types of invertebrates. For the Cladocera, many genera did not indicate affinities. Chydorus spp. dominated the cladoceran communities of all th ...
Network ecology: topological constraints on ecosystem dynamics
... problems are essentially topological ones. For example, a current key topic in ecology and conservation biology is how to link species and ecosystems ([66], i.e., what do species do in a forest, and what does the whole forest community do with its species). If the role of species is to be understood ...
... problems are essentially topological ones. For example, a current key topic in ecology and conservation biology is how to link species and ecosystems ([66], i.e., what do species do in a forest, and what does the whole forest community do with its species). If the role of species is to be understood ...
Effects of some natural and artificial substrata on sessile marine
... demonstrate that type of substratum plays an important role in determining the abundance of sessile species in some marine habitats. Reasons for these effects are not clear but may include differential grazing by invertebrates or differential retention of spores, water or heat. Using artificial subs ...
... demonstrate that type of substratum plays an important role in determining the abundance of sessile species in some marine habitats. Reasons for these effects are not clear but may include differential grazing by invertebrates or differential retention of spores, water or heat. Using artificial subs ...
The relationship between biodiversity and ecosystem functioning in
... biodiversity can act as biological insurance against potential disruptions caused by environmental changes. However, these studies generally concern a single trophic level, primary producers for the most part. Changes in biodiversity also affect ecosystem functioning through trophic interactions. Her ...
... biodiversity can act as biological insurance against potential disruptions caused by environmental changes. However, these studies generally concern a single trophic level, primary producers for the most part. Changes in biodiversity also affect ecosystem functioning through trophic interactions. Her ...
Full Text - Digital Access to Scholarship at Harvard
... environmental dissimilarity and geographic distance influence community assembly and composition. At small scales, community ecologists study how one or several species interact to determine habitat partitioning and coexistence. In this dissertation, I present studies at both scales. Chapter One inv ...
... environmental dissimilarity and geographic distance influence community assembly and composition. At small scales, community ecologists study how one or several species interact to determine habitat partitioning and coexistence. In this dissertation, I present studies at both scales. Chapter One inv ...
The Landscape Ecology of Invasive Spread
... biodiversity, little theoretical or empirical research has addressed the effects of landscape structure—or spatial pattern more generally—on the spread of invasive species. Landscape ecology is the study of how spatial pattern affects ecological process. Thus, a landscape ecology of invasive spread ...
... biodiversity, little theoretical or empirical research has addressed the effects of landscape structure—or spatial pattern more generally—on the spread of invasive species. Landscape ecology is the study of how spatial pattern affects ecological process. Thus, a landscape ecology of invasive spread ...
NSW Invasive Species Plan 2008-2015
... Invasive plant species embody a more diverse and significant threat with over 1,350 exotic plant species naturalised in NSW with more than 300 having detrimental impacts on the biodiversity and primary production of NSW. The most effective way to manage invasive species is to prevent their initial i ...
... Invasive plant species embody a more diverse and significant threat with over 1,350 exotic plant species naturalised in NSW with more than 300 having detrimental impacts on the biodiversity and primary production of NSW. The most effective way to manage invasive species is to prevent their initial i ...
Effect of Prey Limitation on Competitive Interactions Between a
... plastic cup containing a 2 by 7 cm piece of paper towel. Our control treatments consisted of conspeciÞc pairs of C. novemnotata with both larvae in the pair from the same geographic origin (either eastern or western populations). All species pairings were made at two aphid densities, “low” (0.035 ⫾ ...
... plastic cup containing a 2 by 7 cm piece of paper towel. Our control treatments consisted of conspeciÞc pairs of C. novemnotata with both larvae in the pair from the same geographic origin (either eastern or western populations). All species pairings were made at two aphid densities, “low” (0.035 ⫾ ...
Orconectes rusticus_Govas_2011
... candidacy for invasiveness (Wilson et al. 2004). O. rusticus are found in freshwater lakes, ponds and streams. Within these bodies of water they can be found in low-flow pooling areas and areas with moderate rates of flow excluding high flow areas within lakes and rivers. Observed preference of subs ...
... candidacy for invasiveness (Wilson et al. 2004). O. rusticus are found in freshwater lakes, ponds and streams. Within these bodies of water they can be found in low-flow pooling areas and areas with moderate rates of flow excluding high flow areas within lakes and rivers. Observed preference of subs ...
indonesia - Operation Wallacea
... You can join an expedition to collect data for your own project, using this towards your degree or in some cases masters theses or even to allow you the opportunity to work in a particular field or study area. Choose from one of the following**: ...
... You can join an expedition to collect data for your own project, using this towards your degree or in some cases masters theses or even to allow you the opportunity to work in a particular field or study area. Choose from one of the following**: ...
The niche construction paradigm in ecological time
... important in a more general formulation of the niche construction idea is its application at an interspecific level. Indeed, conceptual frameworks such as the response/effect competition framework of Goldberg (1990) are by nature interspecific and conceptually fall within the same sort of framework. T ...
... important in a more general formulation of the niche construction idea is its application at an interspecific level. Indeed, conceptual frameworks such as the response/effect competition framework of Goldberg (1990) are by nature interspecific and conceptually fall within the same sort of framework. T ...
Experimental Manipulation of a Desert Rodent Community: Food
... or remove certaincombinationsof species of seed-eatingrodents and ants from 0.25-ha plots in the ChihuahuanDesert of southeasternArizona. These experimentsevaluate the extent to which food availability and interspecificcompetition influence rodent populations. Monitoringwith live traps revealedthat: ...
... or remove certaincombinationsof species of seed-eatingrodents and ants from 0.25-ha plots in the ChihuahuanDesert of southeasternArizona. These experimentsevaluate the extent to which food availability and interspecificcompetition influence rodent populations. Monitoringwith live traps revealedthat: ...
883) What controls the ability of species to respond (by
... value for money in terms of conservation gain per £ spent? Will the new Environmental Stewardship schemes? How should we structure these incentive programs to maximize conservation bang for the buck? 71) Will agri-environment schemes recover the depauperate populations of farmland wildlife? 72) Whic ...
... value for money in terms of conservation gain per £ spent? Will the new Environmental Stewardship schemes? How should we structure these incentive programs to maximize conservation bang for the buck? 71) Will agri-environment schemes recover the depauperate populations of farmland wildlife? 72) Whic ...
temperate lake ecosystems Synchronous dynamics of zooplankton
... communities [1,2] and of the processes structuring community composition [3–5]. Synchrony and its alternative pattern, compensation (or compensatory dynamics), are mutually exclusive phenomenological features of community dynamics that can arise from many underlying mechanisms [6,7]. Compensation ma ...
... communities [1,2] and of the processes structuring community composition [3–5]. Synchrony and its alternative pattern, compensation (or compensatory dynamics), are mutually exclusive phenomenological features of community dynamics that can arise from many underlying mechanisms [6,7]. Compensation ma ...
Quantifying predator dependence in the functional
... the attack rates and mutual predator e↵ects is not possible with only one feeding survey. Rather, doing so requires replicate surveys that vary in predator densities. Specifically, we require at least one more survey than the number of considered predator species. An additional benefit of the statis ...
... the attack rates and mutual predator e↵ects is not possible with only one feeding survey. Rather, doing so requires replicate surveys that vary in predator densities. Specifically, we require at least one more survey than the number of considered predator species. An additional benefit of the statis ...
The Salamanders of Tennessee
... *Often declines are caused by a combination of factors and do not have a single cause. ...
... *Often declines are caused by a combination of factors and do not have a single cause. ...
Competitive Response Hierarchies for Germination
... two-way ANOVA, so we conducted two one-way ANOVAs instead, with either species or competition as independent variables. Adult survivorship was analyzed using a nominal logistic model with likelihoodratio effects tests. ANOVAs were conducted with JMP (SAS Institute, Cary, North Carolina, USA), which ...
... two-way ANOVA, so we conducted two one-way ANOVAs instead, with either species or competition as independent variables. Adult survivorship was analyzed using a nominal logistic model with likelihoodratio effects tests. ANOVAs were conducted with JMP (SAS Institute, Cary, North Carolina, USA), which ...
Table 1: Official conservation status of Brisbane`s stream
... from temporary ones because their larval stage is longer than the persistence of water in these habitats. Therefore, the mix of frog species found in different sized streams can be partially explained by the different periods of water availability needed by each species in order to breed ...
... from temporary ones because their larval stage is longer than the persistence of water in these habitats. Therefore, the mix of frog species found in different sized streams can be partially explained by the different periods of water availability needed by each species in order to breed ...
Exergetic Model of Secondary Successions for Plant Communities in
... possibility of reaching multiple “climax” states through its “policlimax” concept. Westoby et al. [6] developed a new successional model, originally made for rangelands, though suitable for other ecosystems [7–9]. This is based on the description of a group of discreet vegetation “states” and “trans ...
... possibility of reaching multiple “climax” states through its “policlimax” concept. Westoby et al. [6] developed a new successional model, originally made for rangelands, though suitable for other ecosystems [7–9]. This is based on the description of a group of discreet vegetation “states” and “trans ...
The influence of dispersal on zooplankton community structure and
... predominant focus in driving community structure. Theoretical and empirical studies have suggested that only one species should exist for each limiting resource, or in other words, no two species should share the same niche (Gause 1934; Hardin 1960). However, the competitive exclusion principle is u ...
... predominant focus in driving community structure. Theoretical and empirical studies have suggested that only one species should exist for each limiting resource, or in other words, no two species should share the same niche (Gause 1934; Hardin 1960). However, the competitive exclusion principle is u ...
Rethinking Community Assembly through the Lens
... 2002, Cavender-Bares et al. 2004a). Second, Hubbell’s unified neutral theory, which explains high diversity with slow stochastic drift when species are equivalent in their competitive ability (i.e., are neutral), reinvigorated debate that the processes influencing diversity include both local and shor ...
... 2002, Cavender-Bares et al. 2004a). Second, Hubbell’s unified neutral theory, which explains high diversity with slow stochastic drift when species are equivalent in their competitive ability (i.e., are neutral), reinvigorated debate that the processes influencing diversity include both local and shor ...