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Mosquito habitats and predation efficiency on mosquito populations in Ginninderra Wetland, Canberra, AustraliaHoa, Vu Minh, n/a January 1993 (has links)
The ecology of mosquito populations in relation to weather conditions,
emergent plants and predation in an urban wetland of Canberra was
studied. Anopheles annulipes, Aedes notoscriptus, Aedes australicus,
Aedes alboannulata, Culex annulirostris and Culex quinquefasciatus
were found. Temperature was a major climatic factor in determining
the abundance of mosquito populations in the wetland. First
collections and subsequent development of mosquitoes in Ginninderra wetland are likely to depend on local weather conditions each year.
The wetland proper was not a suitable habitat for mosquito breeding.
Tall emergent vegetation may have obstructed oviposition and
predation was also important in limiting colonization by mosquitoes.
Instead, isolated temporary waterbodies which were free of predators,
such as ground depressions, tyre tracks, domestic waste containers,
were the most important habitats for mosquitoes adjacent to the
Ginninderra wetland.
Field experiments found that predation of mosquito larvae by
mosquitofish Gambusia qffinis and notonectids Anisops was more
efficient in sunlight than shade and this was affected by the height of
emergent plants.
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What Would a Waterbird Do? An Annual Study of 13 Urban Wetlands in Frisco, TexasProctor, Jayce Alan 05 1900 (has links)
Intention for this study is driven by finding patterns that may be shown to reveal primary factors of influence for the abundance and diversity of wetland birds. These correlations may be used to promote wetland management strategies for the benefit of waterbird species, and help illuminate current local wetland conditions for waterbirds, respectively. The idea is to help enliven individuals to become a more conscious steward and manipulator of our environment through incorporating structural and biological components into wetland development and management strategies, and broadly speaking, urban development practices.
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The Effect of Wetland Size and Surrounding Land Use on Wetland Quality along an Urbanization Gradient in the Rocky River WatershedGunsch, Marilyn S. 29 October 2008 (has links)
No description available.
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Modélisation, simulation et analyse des dynamiques spatiales des zones humides urbaines par automate cellulaire : une étude de cas à la ville de Bogota, ColombieCuellar Roncancio, Yenny Andrea 08 1900 (has links)
Les zones humides sont écosystèmes reconnus de vitale importance pour la conservation de la biodiversité et pour un développement soutenable. En Colombie, 26 % du territoire continental national est couvert de ces écosystèmes. Le complexe de zones humides urbaines de Bogota, en fait partie, avec 15 écosystèmes, dont la Convention Ramsar reconnaît 11. Ils sont uniques et jouent un rôle important dans l’approvisionnement des services écosystèmes à la zone urbaine. Cependant, ces écosystèmes urbains font face à de nombreux défis en raison de leur emplacement. Les causes et les conséquences de leur transformation sont très complexes. En appliquant des approches des systèmes complexes, sa dynamique de changement peut être étudiée. Les automates cellulaires sont l’une des techniques largement utilisées dans la modélisation de la dynamique spatiotemporelle des changements de l’usage et de l’occupation des sols. Cette étude propose l’analyse et la simulation des zones humides urbaines en appliquant une approche hybride par un modèle couplé de chaîne de Markov, de réseaux de neurones artificiels et d’automates cellulaires, afin d’estimer leurs changements d’étendue pour les années 2016, 2022, 2028 et 2034 dans la ville de Bogota, en Colombie. Pour extraire le changement d’occupation et d’utilisation du sol, trois images analogues des années 1998, 2004 et 2010 ont été a utilisées. Les résultats ont montré une diminution de 0,30 % de la couverture des zones humides en douze ans. De plus, les résultats suggèrent que la couverture des zones humides représentera 1,97 % de la zone d’étude totale en 2034, représentant une probabilité de diminution de 14 % en 24 ans. D’ailleurs, en appliquant l’analyse d’intensité, il a été constaté que le gain de cultures et de pâturages cible la perte de zones humides. Bien dont ces écosystèmes soient protégés et d’utilisation restreinte, leur patron de réduction se poursuivra en 2034. La pertinence de ce projet réside dans sa contribution potentielle au processus décisionnel au sein de la ville et en tant qu’instrument de gestion des ressources naturelles. En outre, les résultats de cette étude pourraient aider à atteindre l’objectif de développement durable 6 « Eau propre et assainissement » et l’atténuation du changement climatique. / Wetlands are ecosystems recognized as being of vital importance for the conservation of biodiversity and for sustainable development. In Colombia, 26% of the national continental territory is covered by these ecosystems. The complex of urban wetlands of Bogota is one of them, with 15 ecosystems, of which the Ramsar Convention recognizes 11. They are unique and play an important role in providing ecosystem services to the urban area. However, these urban ecosystems face many challenges due to their location. The causes and consequences of their transformation are very complex. By applying complex systems approaches, the dynamics of change can be studied. Cellular automata is one of the widely used techniques in modeling the spatiotemporal dynamics of land use and land cover changes. This study proposes the analysis and simulation of urban wetlands by applying a hybrid approach through a coupled model of the Markov chain, artificial neural networks, and cellular automata, in order to estimate the extent of changes for the years 2016, 2022, 2028, and 2034 in the city of Bogota, Colombia. To extract the change in land cover and land use, three analogous images from the years 1998, 2004, and 2010 were used. The results showed a 0.30% decrease in wetland coverage in twelve years. Furthermore, the results suggest that wetland cover will be 1.97% of the total study area in 2034, representing a 14% probability of a decrease in 24 years. Moreover, by applying the intensity analysis, it was found that the gain of crop and pastureland targets the loss of wetlands. Although these ecosystems are protected and of limited use, their pattern of reduction will continue in 2034. The relevance of this project lies in its potential contribution to decision-making within the city and as a natural resource management tool. In addition, the results of this study could help achieve Sustainable Development Goal 6 “Clean Water and Sanitation” and climate change mitigation.
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