That ecological and evolutionary processes can take place on the same time scale is a recent insight. Today we also know that they are directly linked to each other. In the lake Tåkern, in year 2000, there was a structural change when phytoplankton declined and submerged vegetation, mainly stoneworts began to spread. This led to evolutionary changes in the aquatic sowbug, Asellus aquaticus which had previously been limited to the reed, most likely feeding on detritus. But then, sowbugs could exploit the new habitat in stoneworts and a new food resource in terms of periphyton. The aim of this study was to investigate whether the differentiation of the populations has led to specialization in the ecological roles of sowbugs as shredder of coarse detritus and grazer of periphyton. The study was a laboratory experiment in which groups of sowbugs were feeding on decomposing alder (Alnus glutinosa) leaves or periphyton growing on tiles. The results showed that there was no specialization in the habitat-specific food. However, reed animals had a greater (31 %) grazing effect than the stonewort animal on periphyton. There was also a non-significant tendency for reed animals to consume more leaves than the stonewort animals. The conclusion is that the different populations are not different in their functional roles, but the reed animals consume approximate 25 % more food than the stonewort animals, possibly because of higher activity.

Made available in DSpace on 2015-03-05T17:20:09Z (GMT). No. of bitstreams: 0 Previous issue date: 27 / Nenhuma / O presente trabalho pretende desenvolver a idéia de um Direito Eco-Evolutivo baseado em níveis de observação/percepção capazes de possibilitar decisões em conflitos ambientais hipercomplexos. A comunicação ecológica provoca relações de complementaridade, concorrência e antagonismo no seio das instituições jurídicas, promovendo interações de desorganização/reorganização permanentes, similares a de um ecossistema. Através da transposição de categorias originárias da biologia (heterotrofia, parasitismo, mutações), física (termodinâmica) e química (entropia), bem como da utilização de metáforas do Sistema da Arte, linguagem e Semiótica possibilitar-se-á compreensões aprimoradas do fenômeno social no que tange a alta complexidade dos problemas ambientais postos à decisão junto ao Direito. Para tanto, propõem-se a construção de sete níveis de observação, sete tipos de lentes microscópicas, das quais se utilizarão os órgãos jurídicos responsáveis por dirimir/decidir acerca destas situações. Desta forma, busca-se a / The present work intends to develop the idea of an Eco-Evolution Right based on levels of perceptions capable to make possible decisions in Hyper-Complexity ambient conflicts. The ecological communication provokes relations of complementarities, competition and antagonism in the role of the legal institutions, promoting permanent, similar interactions of reorganization of an ecosystem. Through the transposition of originary categories of biology (heterotrophy, parasitism, mutations), physics (thermodynamic) and chemistry (entropy), as well as of the use of metaphors of the System of the Art, language and Semiotics improved understandings of the social phenomenon will be made possible in that it refers to the high complexity of the ambient problems ranks to the together decision to the Right. For in such a way, they consider it construction of seven levels of comment, seven types of microscopically lenses, which will use the responsible legal agencies for decisions about of these situations. Of this form, it p