Tesis sobre el tema "Common-Feeding"
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Kigozi, Frederick. "Feeding biology of common and blue duiker". Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1004725.
Texto completoHorne, P. J. "The feeding biology of the common goby, Pomatoschistus microps (teleostei:Gobiidae)". Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354457.
Texto completoTotton, Sarah Ceridwen. "Spatial and contact behaviour of raccoons using a common feeding area". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20706.pdf.
Texto completoCrandle, Grace. "Problematic pre-school sleeping and feeding: is there a common link?" Thesis, University of Canterbury. Psychology, 2009. http://hdl.handle.net/10092/6234.
Texto completoDel, Nevo Adrian J. "Reproductive biology and feeding ecology of common guillemots Uria aalge on Fair Isle, Shetland". Thesis, University of Sheffield, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295121.
Texto completoRydevik, Elin. "Evaluating the use of photography for monitoring feeding habits of common murre (Uria aalge)". Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-181913.
Texto completoGeierman, Christina. "Barnacle feeding : comparing cirral anatomy, feeding behavior, Reynolds numbers, and cirral fan leakiness across three size classes of three species of common acorn barnacles /". Connect to title online (Scholars' Bank), 2007. http://hdl.handle.net/1794/6003.
Texto completoGeierman, Christina 1982. "Barnacle Feeding: Comparing Cirral Anatomy, Feeding Behavior, Reynolds Numbers, and Cirral Fan Leakiness Across Three Size Classes of Three Species of Common Acorn Barnacles". Thesis, University of Oregon, 2007. http://hdl.handle.net/1794/6003.
Texto completoThis thesis investigated feeding behavior, cirral anatomy, Reynolds numbers (Re's), and leakiness of the cirral fan for three barnacle species: Balanus glandula, Semibalanus cariosus, and Balanus nubilus. A study of the feeding of B. glandula revealed that newly-metamorphosed juveniles fed at Re's less than one and their cirral fan leakiness was <5% at current speeds of 4 cm/s. At this speed, large and medium individuals fed at Re's near unity, and their cirral fans were 6.8±O.7% leaky. The experiments were repeated using S. cariosus and B. nubilus with the same tissue mass as B. glandula. No clear species-specific or size-specific trends were identified in these species. The observed switch from low to high Re feeding in B. glandula may indicate a lower limit to the size of this species, if further research confirms low Re feeding is less efficient and field current velocities are sufficiently low.
Adviser: Richard Emlet
Beach, Mark Andrew. "Experimental studies on the control and regulation of feeding in the common carp, Cyprinus carpio (L.)". Thesis, London Metropolitan University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315493.
Texto completoVazquez, Maria Begona Santos. "Feeding ecology of harbour porpoises, common and bottlenose dolphins and sperm whales in the northeast Atlantic". Thesis, University of Aberdeen, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286846.
Texto completoPionnier, Nicolas. "Immunomodulation of the innate response in common carp Cyprinus carpio by β-glucan feeding and pathogenic infection". Thesis, Keele University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.699664.
Texto completoSyakuri, Hamdan [Verfasser]. "Studies of intestinal barrier functions of common carp, Cyprinus carpio, under feeding modulation and pathogen challenge / Hamdan Syakuri". Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2013. http://d-nb.info/1030453527/34.
Texto completoSerrano, Miguel Santiago. "Probing behaviors of Empoasca kraemeri Ross & Moore (Homoptera: Cicadellidae) on common bean genotypes and the use of AC electronic feeding monitors to characterize tolerance /". free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9841333.
Texto completoAmbrose, Shan Taryn. "Feeding ecology and diet shift of long-beaked common dolphins Delphinus Capensis (Gray 1828) incidentally caught in anti-shark nets off Kwazulu-Natal, South Africa". Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005383.
Texto completoJIN, ZHIRU. "Advanced modelling of the CR apparatus, design of innovative injection system architectures and assessment of new strategies for the injected mass control and combustion noise evaluation in diesel engine". Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2966335.
Texto completoO'Connor, Linda-Lou. "Effects of hybridization, feeding behavior, and parity rates of the common house mosquito (Culex pipiens L.) on late season West Nile virus activity". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 139 p, 2009. http://proquest.umi.com/pqdweb?did=1707917201&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Texto completoVENTO, OSCAR. "Research on the fluid dynamics of diesel injection systems, design of innovative closed-loop control strategies, assessment of a new flowmeter for high-pressure fluids and 1D modelling of liquid and gaseous flows". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2927462.
Texto completoZHANG, TANTAN. "Design of innovative solutions for high-pressure fuel injection systems, optimization of measuring techniques for injected flow-rate and modeling of 1D flows". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2843978.
Texto completoPretorius, Q. "The evaluation of larvae of Musca domestica (common house fly) as protein source for broiler production". Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/46243.
Texto completoENGLISH ABSTRACT: The objective of this study was to evaluate the use of Musca domestica (common house fly) larvae meal, as protein source, for broiler production. This was done by investigating the nutritive value of house fly larvae meal together with its total tract digestibility, potential toxicity and carcass characteristics of the broilers supplemented with house fly larvae meal. The proximate analysis of house fly larvae meal show that it contained, on a dry matter basis, a gross energy value of 20.10 MJ/kg, 60.38% crude protein, 14.08% crude fat and 10.68% ash and that the house fly pupae contained a gross energy of 20.42 MJ/kg, 76.23% crude protein, 14.39% crude fat and 7.73% ash. House fly pupae meal had the closest match of amino acid profile when compared with the ideal amino acid profile required by broilers and it has arginine relative to the lysine content closer to the ideal amino acid profile than the house fly larvae meal. The essential fatty acid, linoleic acid, was found at levels of 26.25 and 36.27% of the total fats for the house fly larvae and pupae meal respectively. House fly larvae meal supplementation did not induce gizzard erosion or showed toxicity (regarding the gastro intestinal tract, immune system and organ stress) in broilers. Results revealed that house fly pupae meal had higher total tract digestibilities for most nutrients than of the house fly larvae meal. House fly larvae meal had a crude protein total tract digestibility of 69% and that of pupae meal was 79%. Both larvae and pupae meal had high amino acid total tract digestibilities of all the amino acids analysed. The house fly larvae and pupae meal had an apparent metabolizable energy (AME) value of 14.23MJ/kg and 15.15MJ/kg respectively. The larvae meal total tract crude fat and crude fibre digestibilities were 94% and 62% respectively. The pupae meal total tract crude fat and crude fibre digestibilities were 98% and 58% respectively. House fly larvae meal supplementation in a three phase feeding system significantly increased average broiler live weights at slaughter, total feed intake, cumulative feed intake as well as average daily gain (ADG) when compared to commercial maize: soya oil cake meal diet. In direct comparison of larvae inclusion levels with fishmeal in isonitrogenous and isoenergetic diet, no significant differences were observed between a 10% house fly larvae and a 10% fish meal diets regarding performance characteristic. The 25% house fly larvae meal diet yielded significantly better average broiler live weights at slaughter, total feed intake, cumulative feed intake (from the second week until slaughter) as well as average daily gain when compared to the 25% fish meal diet in the growth phases. Carcass characteristics of the 10% larvae, 10% fishmeal and commercial diets were compared. Chicks that received either the 10% house fly larvae meal or 10% fish meal supplementation produced significantly heavier carcasses and breast muscle portions than the chicks that received the commercial maize: soya oil cake meal. No treatment differences were found regarding breast and thigh muscle colour or pH. This study showed that house fly larvae meal can be regarded as a safe protein source that can be used to replace other protein sources and that has the ability to promote broiler performance without having any detrimental effects on carcass characteristics.
AFRIKAANSE OPSOMMING: Die evaluasie van Musca domestica (gewone huisvlieg) larwe meel as ‘n proteien bron vir braaikuiken produksie Die doel van die studie was om die effek van Musca domestica (gewone huisvlieg) larwe meel, as ‘n protein bron, in braaikuikens te evalueer. Dit was gedoen deur die nutrient waarde van huisvlieg larwe meel saam met die totale spysvertering verteerbaarheid, moontlike toksiesiteit en karkas-eienskappe van braai kuikens te evalueer. Laboratoruim analiese toon dat huisvlieg larwe meel 20.10 MJ/kg bruto energie, 60.38% ru- protein, 14.08% ru- vet en 10.68% as bevat en huisvlieg papie meel 20.42 MJ/kg bruto energie, 76.23% ru- protein, 14.39% ru- vet en 7.73% as bevat. Huisvlieg papie meel stem die meeste ooreen met die idiale amino suur profiel soos wat benodig word deur braaikuikens en dit het ‘n arginien tot lisien verhouding wat die meeste ooreenstem met die idiale amino suur profiel in vergelyking met huis vlieg larwe meel. Die essensiele vet suur, linolien suur, was geanaliseer teen vlakke van 26.25- en 36.27% van die totale vette onderskeidelik vir huisvlieg larwe- en papie meel. Huisvlieg larwe meel vervanging het nie spiermaag erosie of enige ander toksiese effekte te veroorsaak nie. Resultate het getoon dat huisvlieg papie meel, in vergelyking met larwe meel, het ‘n hoër totale spysvertering verteerbaarheid vir meeste van die nutrient. Die huisvlieg larwe meel het ‘n totale ru- protein spysvertering verteerbaarheid van 69% en die van papie meel van 79%. Beide larwe en papie meel het hoë amino suur spysvertering verteerbaarheid. Larwe meel en papie meel het skynbare metaboliseerbare energie waardes van 14.23MJ/kg en 15.15%MJ/kg onderskeidelik. Die larwe meel het ‘n ru-vet en ru- vesel spysvertering verteerbaarheid van 94% en 62% onderskeidelik, waar die papies ‘n ru-vet en ru- vesel spysvertering verteerbaarheid van onderskeidelik 98% en 58% het. Huisvlieg larwe meel vervanging in ‘n drie fase voer stelsel het getoon om die gemiddelde braaikuiken lewende gewigte by slag, totale voer iname, sowel as die gemiddelde daaglikse toename te verhoog waneer dit vergelyk word met ‘n kommersiele mielie- soya olie koek dieet. Geen mekwaardige verskille was waargeneem toe die 10% larwe meel dieet direk met die 10% vismeel diet vergelyk was rakende enige produksie einskappe gemeet nie. Die 25% larwe meel dieet het merkwaardig beter gemiddelde braaikuiken lewende gewigte by slag, totale voer iname, sowel as die gemiddelde daaglikse toename getoon wanneer vergelyk word met die 25% vismeel dieet gedurende die verskeie groei fases. Karkas eienskappe van die 10% larwe meel, 10% vismeel en die kommersiele diete was gevergelyk. Kuikens wat 10% larwe meel en 10% vismeel in die diete ontvang het, het swaarder karkasse gelewer met swaarder borsie massas wanneer vergelyk word met die kommersiele mielie- soya olie koek dieet. Geen behandelings verskille was gevind rakende die borsie- en dy spier kleure of pH nie. Die studie toon dat huisvlieg larwe meel as ‘n veillige protein bron kan beskou word, wat gebruik kan word om ander protein bronne te vervang. Huisvlieg larwe meel het ook die vermoë om braaikuiken produksie te verhoog sonder om enige negitiewe effekte rakende die karkas eienskappe te toon nie.
Ijumba, Petrida. "Intervention for improved newborn feeding and survival where HIV is common : Perceptions and effects of a community-based package for maternal and newborn care in a South African township". Doctoral thesis, Uppsala universitet, Internationell mödra- och barnhälsovård (IMCH), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-232110.
Texto completoDaly, Derek. "The behavioural ecology of the common wasp Vespula vulgaris (L) (Hymenoptera: Vespidae)". Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367252.
Texto completoLiu, Kenwin. "Modelling the physiology, behaviour and ecology of dive foraging seabirds : determining the availability of prey and predicting the pelagic distribution of the common guillemot Uria aalge in Moray Firth". Thesis, University of Aberdeen, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248595.
Texto completoHossain, M. A. "Nutritional evaluation of some Bangladeshi oilseed by-products as dietary protein sources for common carp (Cyprinus carpio L)". Thesis, University of Stirling, 1988. http://hdl.handle.net/1893/1803.
Texto completoRazanaparany, Tojotanjona Patrick. "Ecological Flexibility of the Common Brown Lemur (Eulemur fulvus) and Its Conservation in the Dry Deciduous Forest in Northwestern Madagascar". Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263766.
Texto completoPretorius, Quinton. "The evaluation of larvae of Musca Domestica (common house fly) as protein source for boiler production". Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6667.
Texto completoIncludes bibliography.
ENGLISH ABSTRACT: The objective of this study was to evaluate the use of Musca domestica (common house fly) larvae meal, as protein source, for broiler production. This was done by investigating the nutritive value of house fly larvae meal together with its total tract digestibility, potential toxicity and carcass characteristics of the broilers supplemented with house fly larvae meal. The proximate analysis of house fly larvae meal show that it contained, on a dry matter basis, a gross energy value of 20.10 MJ/kg, 60.38% crude protein, 14.08% crude fat and 10.68% ash and that the house fly pupae contained a gross energy of 20.42 MJ/kg, 76.23% crude protein, 14.39% crude fat and 7.73% ash. House fly pupae meal had the closest match of amino acid profile when compared with the ideal amino acid profile required by broilers and it has arginine relative to the lysine content closer to the ideal amino acid profile than the house fly larvae meal. The essential fatty acid, linoleic acid, was found at levels of 26.25 and 36.27% of the total fats for the house fly larvae and pupae meal respectively. House fly larvae meal supplementation did not induce gizzard erosion or showed toxicity (regarding the gastro intestinal tract, immune system and organ stress) in broilers. Results revealed that house fly pupae meal had higher total tract digestibilities for most nutrients than of the house fly larvae meal. House fly larvae meal had a crude protein total tract digestibility of 69% and that of pupae meal was 79%. Both larvae and pupae meal had high amino acid total tract digestibilities of all the amino acids analysed. The house fly larvae and pupae meal had an apparent metabolizable energy (AME) value of 14.23MJ/kg and 15.15MJ/kg respectively. The larvae meal total tract crude fat and crude fibre digestibilities were 94% and 62% respectively. The pupae meal total tract crude fat and crude fibre digestibilities were 98% and 58% respectively. House fly larvae meal supplementation in a three phase feeding system significantly increased average broiler live weights at slaughter, total feed intake, cumulative feed intake as well as average daily gain (ADG) when compared to commercial maize: soya oil cake meal diet. In direct comparison of larvae inclusion levels with fishmeal in isonitrogenous and isoenergetic diet, no significant differences were observed between a 10% house fly larvae and a 10% fish meal diets regarding performance characteristic. The 25% house fly larvae meal diet yielded significantly better average broiler live weights at slaughter, total feed intake, cumulative feed intake (from the second week until slaughter) as well as average daily gain when compared to the 25% fish meal diet in the growth phases. Carcass characteristics of the 10% larvae, 10% fishmeal and commercial diets were compared. Chicks that received either the 10% house fly larvae meal or 10% fish meal supplementation produced significantly heavier carcasses and breast muscle portions than the chicks that received the commercial maize: soya oil cake meal. No treatment differences were found regarding breast and thigh muscle colour or pH. This study showed that house fly larvae meal can be regarded as a safe protein source that can be used to replace other protein sources and that has the ability to promote broiler performance without having any detrimental effects on carcass characteristics.
AFRIKAANSE OPSOMMING: Die doel van die studie was om die effek van Musca domestica (gewone huisvlieg) larwe meel, as ‘n protein bron, in braaikuikens te evalueer. Dit was gedoen deur die nutrient waarde van huisvlieg larwe meel saam met die totale spysvertering verteerbaarheid, moontlike toksiesiteit en karkas-eienskappe van braai kuikens te evalueer. Laboratoruim analiese toon dat huisvlieg larwe meel 20.10 MJ/kg bruto energie, 60.38% ru- protein, 14.08% ru- vet en 10.68% as bevat en huisvlieg papie meel 20.42 MJ/kg bruto energie, 76.23% ru- protein, 14.39% ru- vet en 7.73% as bevat. Huisvlieg papie meel stem die meeste ooreen met die idiale amino suur profiel soos wat benodig word deur braaikuikens en dit het ‘n arginien tot lisien verhouding wat die meeste ooreenstem met die idiale amino suur profiel in vergelyking met huis vlieg larwe meel. Die essensiele vet suur, linolien suur, was geanaliseer teen vlakke van 26.25- en 36.27% van die totale vette onderskeidelik vir huisvlieg larwe- en papie meel. Huisvlieg larwe meel vervanging het nie spiermaag erosie of enige ander toksiese effekte te veroorsaak nie. Resultate het getoon dat huisvlieg papie meel, in vergelyking met larwe meel, het ‘n hoër totale spysvertering verteerbaarheid vir meeste van die nutrient. Die huisvlieg larwe meel het ‘n totale ru- protein spysvertering verteerbaarheid van 69% en die van papie meel van 79%. Beide larwe en papie meel het hoë amino suur spysvertering verteerbaarheid. Larwe meel en papie meel het skynbare metaboliseerbare energie waardes van 14.23MJ/kg en 15.15%MJ/kg onderskeidelik. Die larwe meel het ‘n ru-vet en ru- vesel spysvertering verteerbaarheid van 94% en 62% onderskeidelik, waar die papies ‘n ru-vet en ru- vesel spysvertering verteerbaarheid van onderskeidelik 98% en 58% het. Huisvlieg larwe meel vervanging in ‘n drie fase voer stelsel het getoon om die gemiddelde braaikuiken lewende gewigte by slag, totale voer iname, sowel as die gemiddelde daaglikse toename te verhoog waneer dit vergelyk word met ‘n kommersiele mielie- soya olie koek dieet. Geen mekwaardige verskille was waargeneem toe die 10% larwe meel dieet direk met die 10% vismeel diet vergelyk was rakende enige produksie einskappe gemeet nie. Die 25% larwe meel dieet het merkwaardig beter gemiddelde braaikuiken lewende gewigte by slag, totale voer iname, sowel as die gemiddelde daaglikse toename getoon wanneer vergelyk word met die 25% vismeel dieet gedurende die verskeie groei fases. Karkas eienskappe van die 10% larwe meel, 10% vismeel en die kommersiele diete was gevergelyk. Kuikens wat 10% larwe meel en 10% vismeel in die diete ontvang het, het swaarder karkasse gelewer met swaarder borsie massas wanneer vergelyk word met die kommersiele mielie- soya olie koek dieet. Geen behandelings verskille was gevind rakende die borsie- en dy spier kleure of pH nie. Die studie toon dat huisvlieg larwe meel as ‘n veillige protein bron kan beskou word, wat gebruik kan word om ander protein bronne te vervang. Huisvlieg larwe meel het ook die vermoë om braaikuiken produksie te verhoog sonder om enige negitiewe effekte rakende die karkas eienskappe te toon nie.
Simões, Sandra Cristina Sousa. "Ecology and feeding behaviour of the Common Otter in the lower Mondego river valley". Master's thesis, 2017. http://hdl.handle.net/10316/83372.
Texto completoA lontra comum é um predador tipicamente piscívoro que está atualmente classificado como quase ameaçado na Europa. Este mamífero enfrenta muitas ameaças, como a fragmentação do seu habitat, a poluição dos cursos de água e a baixa disponibilidade de presas. No entanto, o seu estatuto de conservação em Portugal foi recentemente alterado para “Pouco Preocupante”, facto que coincidiu com o aumento da dispersão de espécies introduzidas com potencial invasor no país. Após este fenómeno, a população de lontras em Portugal aumentou, e foi descrita como sendo uma das poucas populações a prosperar na Europa. Neste estudo pretende-se obter dados concretos sobre a ocorrência, abundância e atividade das lontras no Baixo Mondego, assim como compreender a evolução do seu comportamento alimentar após a introdução de espécies exóticas.Os resultados obtidos resultam de métodos de foto-armadilhagem e de recolha e contagem de excrementos, e sua posterior análise laboratorial. Verificou-se que a lontra está bem distribuída no vale do Baixo Mondego, com maior ocorrência nos principais pauis (principalmente no Paúl de Arzila) e na área a sul do vale, próxima dos campos de arroz. Os resultados apontam também para a plasticidade do comportamento alimentar da espécie, uma vez que foram detectadas alterações nos padrões de ocorrência e de composição alimentar de acordo com a sazonalidade e a abundância de alimento. Verificou-se que no inverno a lontra apresenta uma maior abundância em Arzila, movimentando-se no verão para a área envolvente do rio Arunca, composta maioritariamente por culturas de arroz com maior volume de água, o que proporciona uma maior disponibilidade de presas. No inverno, as presas principais foram as várias espécies de peixe, contrastando com a dominância no consumo de lagostim no verão, revelando um comportamento alimentar oportunista.Após a introdução e expansão do lagostim, a dieta da lontra passou a ser quase exclusivamente constituída por esta espécie invasora. Atualmente, a sua dieta apresenta um menor consumo de lagostim, e um maior recurso às espécies de peixe. A evolução da composição da dieta de lontra poderá estar relacionada com uma diminuição na abundância de lagostim, consequência da sua predação por várias espécies de aves e mamíferos, incluindo a lontra.Face aos resultados, a lontra pode estar a desempenhar um papel de espécie guarda-chuva através do controlo de espécies invasoras, como o lagostim, do qual beneficiam as espécies nativas. Este controlo de pragas permite que as espécies nativas recuperem nos seus efetivos populacionais, aumentando a biodiversidade dos ecossistemas ripícolas, para além de contribuírem para a redução dos danos causados às culturas de arroz por parte do lagostim, fornecendo assim um serviço de ecossistema, com benefícios diretos para as populações humanas e economia local.
The Common otter is typically a piscivorous predator that is currently classified as near threatened in Europe. This mammal species faces many threats, such as habitat fragmentation, pollution of water courses and low availability of prey. Nevertheless, its conservation status in Portugal has recently been changed to Least Concern, which was coincident with the increase of introduced species throughout the country. After this phenomenon, the population of otter in Portugal increased, and it was described as one of the few populations thriving in Europe. On the present study, it is intended to obtain robust data on the occurrence, abundance and activity of otter the lower Mondego river valley, as well as to understand the evolution of their feeding behaviour after the introduction of exotic species.The results obtained are the outcome of camera-trap methods and counting and collection of spraints, and its subsequent laboratory analysis. It was verified that otter is well distributed in the valley, with higher occurrences in the main marshes (mainly in Arzila Marsh) and in the south area of the valley, around the rice fields. The results also point to the plasticity of this species in terms of feeding behaviour, since were detected changes in their occurrence patterns and diet composition according to the seasonality and abundance of prey. It was verified that in winter the abundance of otter is higher in Arzila, followed by their movement in summer for the surrounding areas of the Arunca River, when the fields of rice hold larger amounts of water, which provides a greater availability of prey. In winter, the main preys were the several fish species, contrasting with the dominance in the consumption of crayfish in the summer, revealing an opportunistic feeding behaviour of otter.After the introduction and expansion of crayfish, otter’s diet became almost exclusively constituted by this invasive species. Currently, the otter presents a lower consumption of crayfish, and a greater use of fish species. The evolution of the composition of the diet of otter may be related to a decrease in the abundance of crayfish, which can be a consequence of its predation by several species of birds and mammals, including Common otter.Based on our results, the Common otter may be playing a role as umbrella species through the control of invasive species, such as crayfish, from which the native species benefit. This pest control allows the populations of native species to recover, increasing the biodiversity of the riparian ecosystems, as well as contribute to the reduction of damages caused to rice crops by crayfish, and thus providing an ecosystem service which direct benefits to human populations and the local economy.
Reis, Diana Filipa Botelho. "Improvement of common octopus (Octopus vulgaris) paralarval culture, based on studies of feeding and nutrition with alternative preys". Master's thesis, 2011. http://hdl.handle.net/10400.1/10985.
Texto completoNeste momento a indústria da aquacultura apresenta um enorme potencial de expansão e desenvolvimento, apesar de alguma saturação dos mercados com espécies chave. Um desses exemplos é a saturação do mercado mediterrânico com dourada e robalo. Devido à necessidade de diversificar essa oferta de mercado e pelo elevado valor comercial dos cefalópodes, o cultivo do polvo comum (Octopus vulgaris) foi ganhando um maior interesse nestes últimos anos. Actualmente o cultivo de polvo tem-se cingido à captura de juvenis selvagens com um peso minimo de 750 g (peso mínimo legal de captura) e a sua engorda até 2-3 kg durante 3 a 4 meses em tanques de terra ou em jaulas onshore. O presente estudo foi realizado com o intuito de analisar o efeito de três presas [juvenis de Artemia spp. cultivados durante 7 a 10 dias com Tetraselmis chuii, larvas pós-eclodidas de Grapsus grapsus (caranguejo) e larvas de Palaemon elegans (camarão)] na taxa de sobrevivência, crescimento e composição nutricional, de paralarvas de O. vulgaris. Foi também realizado um estudo de predação e de algumas características biológicas das presas, como tamanho da larva e fecundidade destas espécies. Para o estudo dos efeitos das presas nas paralarvas de polvo, foram realizadas duas experiencias. Na primeira experiência foi usada uma densidade de 5 paralarvas/L para avaliar o efeito dos juvenis de Artemia spp. (1-ART) e das zoea de camarão (1- PAL). Na segunda experiência, de modo a que o número de presas por paralarva fosse superior, a densidade de cultivo das paralarvas foi reduzida para 1.5 paralarvas/L. Nesta última experiência foi analisado o efeito das três presas, 2-ART, 2-PAL e 2-GRA, que correspondem aos grupos de paralarvas alimentadas com artemias juvenis, larvas de camarão e larvas de caranguejo respectivamente. O cultivo das paralarvas foi realizado em tanques cilindro-cónicos de fibra de vidro de 100L com paredes pretas e fundo branco. Foi usado um sistema aberto com água salgada proveniente de mar aberto e aplicado um foto-periodo de 12L:12E (L - luminosidade; E - escuridão) com uma intensidade de 200 lux na superficie da água.
McNabb, Robert G. "The effects of limit-feeding on two breeds of beef cattle fed to a common backfat level for slaughter". 1995. http://hdl.handle.net/1993/18994.
Texto completoMitura, Anna Katarina Dora. "Entwicklung und erste Erprobung eines Alleinfütterungskonzeptes als zentraler Bestandteil weiterer Standardisierungsschritte bei der Laborhaltung von Weißbüschelaffen (Callithrix jacchus)". Thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-AB4B-5.
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