Search results for "LAKE ECOSYSTEMS"

Ecological indicators – Schrödinger Ratio

2008

Sociālās un ekonomiskās ietekmes ezeru attīrīšanā un labiekārtošanā.

2015

Bakalaura darba „Sociālās un ekonomiskās ietekmes ezeru attīrīšanā un labiekārtošanā” mērķis ir izprast ezeru un to ekosistēmu nozīmīgumu, regulējošās un atbalsta funkcijas, izanalizēt sociālos un ekonomiskos ieguvumus veicot ieguldījumus ezera infrastruktūras un tur mītošo zivju sugu pavairošanas projektos. Bakalaura darba uzdevumos ietilpst ekosistēmu darbības principu apskate, šā brīža makšķerēšanas nozares un ezeru stāvokļa un to problēmu apzināšanās, kā arī ārzemēs veikto pētniecisko darbu analīze un aptaujas rezultātu analizēšana. Lai spētu sniegt ieteikumus Smiltenes ezeru attīrīšanas un labiekārtošanas plāna projekta realizēšanai, tiek izpētīts Katvaru ezera apsaimniekošanas modelis…

A comparison of the impacts of introduced signal crayfish and native noble crayfish in boreal lake ecosystems

2014

Simulated eutrophication and browning alters zooplankton nutritional quality and determines juvenile fish growth and survival

2018

Source at https://doi.org/10.1002/ece3.3832. The first few months of life is the most vulnerable period for fish and their optimal hatching time with zooplankton prey is favored by natural selection. Traditionally, however, prey abundance (i.e., zooplankton density) has been considered important, whereas prey nutritional composition has been largely neglected in natural settings. High‐quality zooplankton, rich in both essential amino acids (EAAs) and fatty acids (FAs), are required as starting prey to initiate development and fast juvenile growth. Prey quality is dependent on environmental conditions, and, for example, eutrophication and browning are two major factors defining primary produ…

Data from: The relevance of ecological status to ecosystem functions and services in a large boreal lake

2015

1. Environmental conventions aim to protect ecosystem structures and functions to provide goods and services for mankind. The degree of aquatic ecosystem naturalness, or ecological status as it is defined in the Water Framework Directive (WFD) of the European Union, is notionally linked to supplies of ecosystem services. In practice these links have rarely been documented or even investigated and, to justify conservation and management objectives based on the status indicators, it is essential to demonstrate their relationships to ecosystem functions and services. 2. The WFD requires member states to classify their surface waters aiming to achieve good ecological status of water bodies. How…