Seasonal and Interannual Variability of Pelagic Zooplankton
... seasonal rainfall and wind generated lake mixing as prime physical factors influencing zooplankton community abundance, biomass, production and vertical distribution characterizes the zooplankton communities of many tropical lakes. A large proportion of zooplankton production may be unutilized at hi ...
... seasonal rainfall and wind generated lake mixing as prime physical factors influencing zooplankton community abundance, biomass, production and vertical distribution characterizes the zooplankton communities of many tropical lakes. A large proportion of zooplankton production may be unutilized at hi ...
Document
... An attempt to establish the trophic position of S. officinalis in an estuarine community (a Zostera meadow in San Simón inlet, Ría de Vigo) was undertaken by Filgueira and Castro (2002) based on the analysis of the stable isotopes C13 and N15 in its muscle and from sympatric organisms. Significant d ...
... An attempt to establish the trophic position of S. officinalis in an estuarine community (a Zostera meadow in San Simón inlet, Ría de Vigo) was undertaken by Filgueira and Castro (2002) based on the analysis of the stable isotopes C13 and N15 in its muscle and from sympatric organisms. Significant d ...
Conservation of Wildlife Populations
... genetics, then move deeper into areas where ecological and genetic concepts and theory are applied. Because this is an applied book on population biology, it will not derive or prove theoretical premises, nor will it dwell on theory not directly applicable to management problems. There are already e ...
... genetics, then move deeper into areas where ecological and genetic concepts and theory are applied. Because this is an applied book on population biology, it will not derive or prove theoretical premises, nor will it dwell on theory not directly applicable to management problems. There are already e ...
Use of Herring Bait to Farm Lobsters in the Gulf...
... management, yet many species such as the American lobster (Homarus americanus) are still largely managed individually. One hypothesis that has yet to be tested suggests that human augmentation of lobster diets via the use of Atlantic herring (Clupea harengus) as bait may contribute to recent increas ...
... management, yet many species such as the American lobster (Homarus americanus) are still largely managed individually. One hypothesis that has yet to be tested suggests that human augmentation of lobster diets via the use of Atlantic herring (Clupea harengus) as bait may contribute to recent increas ...
RegioNAL NAtuRAL ReSouRceS MANAgeMeNt PLAN VoLuMe 1
... developed with land managers (Aboriginal communities, pastoralists, miners etc), industry sectors, the broader community and Government agencies, and incorporate the best available scientific data. Everyone is responsible. Priority-based: Actions to sustain or remediate natural resources and landsca ...
... developed with land managers (Aboriginal communities, pastoralists, miners etc), industry sectors, the broader community and Government agencies, and incorporate the best available scientific data. Everyone is responsible. Priority-based: Actions to sustain or remediate natural resources and landsca ...
Review of nekton patterns and ecological processes
... reflect the overriding importance of other factors such as within-patch characteristics, water depth or position within an estuary. It might also result from measurements at the wrong scale. The rigour of surveys can be improved by avoiding confounding of patch attributes by other factors, increasin ...
... reflect the overriding importance of other factors such as within-patch characteristics, water depth or position within an estuary. It might also result from measurements at the wrong scale. The rigour of surveys can be improved by avoiding confounding of patch attributes by other factors, increasin ...
Factors Driving Herbivores Consumption and
... contigo de este mundo científico y anécdotas inolvidables de nuestras aventuras, especialmente en el Delta del Ebro. Gracias por todo el trabajo dedicado a esta tesis. I would like to especially thank to Ken Heck for his implication in this PhD thesis. Your support and guidance have been really impo ...
... contigo de este mundo científico y anécdotas inolvidables de nuestras aventuras, especialmente en el Delta del Ebro. Gracias por todo el trabajo dedicado a esta tesis. I would like to especially thank to Ken Heck for his implication in this PhD thesis. Your support and guidance have been really impo ...
Community dynamics of ephemeral systems: food web
... planned for the summer of 2012 but was delayed a year because the playas did not fill until the next spring following one of worst droughts in 10 years for Colorado. This makes it difficult for researchers to plan and carry out studies in these ecosystems. Even though playas may be key features of t ...
... planned for the summer of 2012 but was delayed a year because the playas did not fill until the next spring following one of worst droughts in 10 years for Colorado. This makes it difficult for researchers to plan and carry out studies in these ecosystems. Even though playas may be key features of t ...
Population-Level Metrics of Trophic Structure Based on
... with a subscript ‘b’) based on the minimum sample size in the data set (n = 15) to allow comparison among populations among years because sample size varied. The metric mean distance to centroid (CDb) was used as a measure of population trophic diversity. CDb is calculated as the mean Euclidean dist ...
... with a subscript ‘b’) based on the minimum sample size in the data set (n = 15) to allow comparison among populations among years because sample size varied. The metric mean distance to centroid (CDb) was used as a measure of population trophic diversity. CDb is calculated as the mean Euclidean dist ...
Trout cod (Maccullochella macquariensis)recovery plan
... locations and/or habitats. The processes thought to be primarily responsible for the species’ decline include habitat degradation (removal of snags, alteration of river flows, barriers to fish migration, water extraction), illegal fishing and impacts of introduced species. This recovery plan has bee ...
... locations and/or habitats. The processes thought to be primarily responsible for the species’ decline include habitat degradation (removal of snags, alteration of river flows, barriers to fish migration, water extraction), illegal fishing and impacts of introduced species. This recovery plan has bee ...
Marco-Mendez, C., L. M. Ferrero-Vicente, P. Prado, K. L. Heck, J
... experiments was carried out: 1) Cymodocea nodosa epiphytized (CE) vs. P. oceanica epiphytized (PE); 2) C. nodosa non-epiphytized (CNE) vs. P. oceanica non-epiphytized (PNE); 3) C. nodosa epiphytized (CE) vs. C. nodosa non-epiphytized (CNE); and 4) P. oceanica epiphytized (PE) vs. P. oceanica non-epi ...
... experiments was carried out: 1) Cymodocea nodosa epiphytized (CE) vs. P. oceanica epiphytized (PE); 2) C. nodosa non-epiphytized (CNE) vs. P. oceanica non-epiphytized (PNE); 3) C. nodosa epiphytized (CE) vs. C. nodosa non-epiphytized (CNE); and 4) P. oceanica epiphytized (PE) vs. P. oceanica non-epi ...
06
... extremely rare and its present range is very restricted. One new snail was seen in this area during a hike on 26 February 2004. Another search was made 18-20 May 2004. A group of four NRS surveyed the areas south of the Poamoho Stream on a ridge where d’Alte Welch had recorded snails during the 1930 ...
... extremely rare and its present range is very restricted. One new snail was seen in this area during a hike on 26 February 2004. Another search was made 18-20 May 2004. A group of four NRS surveyed the areas south of the Poamoho Stream on a ridge where d’Alte Welch had recorded snails during the 1930 ...
impacts of grey seals on fish populations
... 4VsW, 4X and 5Z. The largest herd numbering some 260,000 to 320,000 seals, depending on model assumptions, occurs on Sable Island. The rate of increase of this herd has slowed from 12.8% during the 1980s to approximately 4% in the last 5 years. It is uncertain if this reduction in population growth ...
... 4VsW, 4X and 5Z. The largest herd numbering some 260,000 to 320,000 seals, depending on model assumptions, occurs on Sable Island. The rate of increase of this herd has slowed from 12.8% during the 1980s to approximately 4% in the last 5 years. It is uncertain if this reduction in population growth ...
06
... In the following section each rare snail species reported from O'ahu Army lands since 1970 is discussed. The status of each species and the management conducted for it is described. 5.6.a Achatinella apexfulva The historical range of A. ape-ifulva comprises parts of the KLOA. In recent years, this s ...
... In the following section each rare snail species reported from O'ahu Army lands since 1970 is discussed. The status of each species and the management conducted for it is described. 5.6.a Achatinella apexfulva The historical range of A. ape-ifulva comprises parts of the KLOA. In recent years, this s ...
Pelagic Organism Decline Progress Report: 2007 Synthesis of Results
... under those acts. Although several species show evidence of long-term declines, the recent low levels were unexpected given the relatively moderate winter-spring flows of the past several years. In response to these changes, the IEP formed a Pelagic Organism Decline (“POD”) work team to evaluate the ...
... under those acts. Although several species show evidence of long-term declines, the recent low levels were unexpected given the relatively moderate winter-spring flows of the past several years. In response to these changes, the IEP formed a Pelagic Organism Decline (“POD”) work team to evaluate the ...
KATARINA OGANJAN Distribution, feeding and
... direct physiological influence but represent proxies for a set of other underlying direct gradients, e.g. water depth is a typical indirect variable in the aquatic systems. Finally, resources are directly consumed by organisms, e.g. nutrients. Moreover, it is often difficult to distinguish between t ...
... direct physiological influence but represent proxies for a set of other underlying direct gradients, e.g. water depth is a typical indirect variable in the aquatic systems. Finally, resources are directly consumed by organisms, e.g. nutrients. Moreover, it is often difficult to distinguish between t ...
Coping with the Lionfish Invasion: Can Targeted Removals Yield
... end, initial results are provided from an ongoing, communitybased lionfish removal program at Little Cayman Island. This work yields the first quantitative estimates of catch per unit effort (CPUE) from multiple locations with similar physiographic characteristics, i.e., depth and substrate type, an ...
... end, initial results are provided from an ongoing, communitybased lionfish removal program at Little Cayman Island. This work yields the first quantitative estimates of catch per unit effort (CPUE) from multiple locations with similar physiographic characteristics, i.e., depth and substrate type, an ...
United States Department of the Interior
... they are typically collected in waters with salinities ranging from 14 to 28 parts per thousand (ppt) (Baxter 1999, pp. 189–192). Longfin smelt are thought to be restricted by high water temperatures, generally greater than 22 degrees Celsius (°C) (71 degrees Fahrenheit (°F)) (Baxter et. al. 2010, ...
... they are typically collected in waters with salinities ranging from 14 to 28 parts per thousand (ppt) (Baxter 1999, pp. 189–192). Longfin smelt are thought to be restricted by high water temperatures, generally greater than 22 degrees Celsius (°C) (71 degrees Fahrenheit (°F)) (Baxter et. al. 2010, ...
Coastal Systems - Millennium Ecosystem Assessment
... sea level rise, erosion, and storm events, coastal populations are at risk of having their relatively high levels of human well-being severely compromised. Trade-offs occur not only within coastal ecosystems, but also between the different uses of coastal systems and inland areas. In general, the ch ...
... sea level rise, erosion, and storm events, coastal populations are at risk of having their relatively high levels of human well-being severely compromised. Trade-offs occur not only within coastal ecosystems, but also between the different uses of coastal systems and inland areas. In general, the ch ...
Alligator Awareness
... an attempt to help control beaver and partially to enhance locally depleted alligator populations. Alligators were often moved into places where they had not historically occurred. Later research indicated that alligators had little effect on beaver populations. With Endangered Species protection, a ...
... an attempt to help control beaver and partially to enhance locally depleted alligator populations. Alligators were often moved into places where they had not historically occurred. Later research indicated that alligators had little effect on beaver populations. With Endangered Species protection, a ...
The significance of ratios of detritus types and micro
... manifestations of photosynthetic primary productivity (Moore et al. 2004), even though the majority of energy in food webs passes through detrital pathways (O’Neill & Reichle 1980; Moore et al. 2004). The effect of detritus on community attributes can be large. Detritus inputs can support higher div ...
... manifestations of photosynthetic primary productivity (Moore et al. 2004), even though the majority of energy in food webs passes through detrital pathways (O’Neill & Reichle 1980; Moore et al. 2004). The effect of detritus on community attributes can be large. Detritus inputs can support higher div ...
photic zone
... algae, and macrophytes (rooted aquatic plants) as food sources increases. Feeding styles of organisms also change: From shredders (tear up and chew leaves) to collectors (collect fine particles from the water). ...
... algae, and macrophytes (rooted aquatic plants) as food sources increases. Feeding styles of organisms also change: From shredders (tear up and chew leaves) to collectors (collect fine particles from the water). ...
Overexploitation
Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Sustained overexploitation can lead to the destruction of the resource. The term applies to natural resources such as: wild medicinal plants, grazing pastures, game animals, fish stocks, forests, and water aquifers.In ecology, overexploitation describes one of the five main activities threatening global biodiversity. Ecologists use the term to describe populations that are harvested at a rate that is unsustainable, given their natural rates of mortality and capacities for reproduction. This can result in extinction at the population level and even extinction of whole species. In conservation biology the term is usually used in the context of human economic activity that involves the taking of biological resources, or organisms, in larger numbers than their populations can withstand. The term is also used and defined somewhat differently in fisheries, hydrology and natural resource management.Overexploitation can lead to resource destruction, including extinctions. However it is also possible for overexploitation to be sustainable, as discussed below in the section on fisheries. In the context of fishing, the term overfishing can be used instead of overexploitation, as can overgrazing in stock management, overlogging in forest management, overdrafting in aquifer management, and endangered species in species monitoring. Overexploitation is not an activity limited to humans. Introduced predators and herbivores, for example, can overexploit native flora and fauna.