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pro vyhledávání: '"Hans Ulrik Riisgård"'
Autor:
Hans Ulrik Riisgård
Publikováno v:
Journal of Marine Science and Engineering, Vol 12, Iss 1, p 138 (2024)
Sponges have always been filter feeders, in contrast to all the other filter-feeding invertebrate groups for which this feeding mode is a secondary adaptation. This study calls attention to this aspect, which explains why sponges are tolerant to hypo
Externí odkaz:
https://doaj.org/article/09bd3677ed0a44bd9d6eecac864ae0f3
Autor:
Hans Ulrik Riisgård
Publikováno v:
Journal of Marine Science and Engineering, Vol 10, Iss 10, p 1368 (2022)
According to a recently presented bioenergetic model for the weight-specific growth rate of jellyfish, Aurelia aurita, fed brine shrimp, Artemia salina, the specific growth will remain high and constant at prey concentrations > 6 Artemia l−1. The a
Externí odkaz:
https://doaj.org/article/878e8a0d908f4e479487def4ca807883
Autor:
Poul S. Larsen, Hans Ulrik Riisgård
Publikováno v:
Journal of Marine Science and Engineering, Vol 10, Iss 9, p 1226 (2022)
Filter-feeding invertebrates are found in almost all of the animal classes that are represented in the sea, where they are the necessary links between suspended food particles (phytoplankton and free-living bacteria) and the higher trophic levels in
Externí odkaz:
https://doaj.org/article/d4cbd3ebc2a9449e81e5210543c04151
Autor:
Hans Ulrik Riisgård, Poul S. Larsen
Publikováno v:
Journal of Marine Science and Engineering, Vol 10, Iss 5, p 643 (2022)
Demosponges are modular filter-feeding organisms that are made up of aquiferous units or modules with one osculum per module. Such modules may grow to reach a maximal size. Various demosponge species show a high degree of morphological complexity, wh
Externí odkaz:
https://doaj.org/article/c4e8f5e4834c4ff2b50ca4143b573777
Autor:
Hans Ulrik Riisgård, Poul S. Larsen
Publikováno v:
Journal of Marine Science and Engineering, Vol 10, Iss 5, p 607 (2022)
Sponges are one of the earliest-evolved and simplest groups of animals, but they share basic characteristics with more advanced and later-evolved filter-feeding invertebrates, such as mussels. Sponges are abundant in many coastal regions where they f
Externí odkaz:
https://doaj.org/article/35f23d4c912b4f57a969abf01cee02da
Publikováno v:
Frontiers in Marine Science, Vol 7 (2020)
Contractile behavior is common among sponges despite their lack of nerves and muscles. As sessile filter-feeders, sponges rely on water with suspended food particles being pumped through their aquiferous system. During contractions, however, the wate
Externí odkaz:
https://doaj.org/article/63e2d5f56bc94ff8a5998b1bc389c0f3
Autor:
Poul S. Larsen, Hans Ulrik Riisgård
Publikováno v:
Journal of Marine Science and Engineering, Vol 9, Iss 11, p 1308 (2021)
Filter-feeding sponges pump large amounts of water and contribute significantly to grazing impact, matter transport and nutrient cycling in many marine benthic communities. For ecological studies it is therefore of interest to be able to estimate the
Externí odkaz:
https://doaj.org/article/d08d24d0dc70474ab7a2fff976f29000
Autor:
Florian Lüskow, Kirstine Kløve-Mogensen, Jakob Tophøj, Lars Haastrup Pedersen, Hans Ulrik Riisgård, Niels Thomas Eriksen
Publikováno v:
Frontiers in Marine Science, Vol 6 (2019)
This study relates the lipid content of two marine filter-feeding demosponges, Halichondria panicea and H. bowerbanki to the seasonal availability of their suspended food, mainly free-living bacteria and phytoplankton at two study sites in Danish wat
Externí odkaz:
https://doaj.org/article/89c01587e0794f5a87e3b9d0ad1bc41a
Publikováno v:
Journal of Marine Science and Engineering, Vol 2, Iss 4, Pp 593-615 (2014)
Limfjorden is a major Danish water system that connects the North Sea via Thyborøn Kanal in the west and to the Kattegat in the east. Limfjorden is heavily eutrophicated and certain areas suffer from oxygen depletion each summer. Bottom-dwelling fis
Externí odkaz:
https://doaj.org/article/9c9c47e90a664c2bb26e8a92b0724cdb
Autor:
Poul S. Larsen, Hans Ulrik Riisgård
Publikováno v:
Biology Open, Vol 1, Iss 1, Pp 6-11 (2011)
Summary To obtain precise and reliable laboratory clearance rate (filtration rate) measurements with the ‘flow-through chamber method’ (FTC) the design must ensure that only inflow water reaches the bivalve's inhalant aperture and that exit flow
Externí odkaz:
https://doaj.org/article/0581b9cc57a74b8cac87a6d39c96537e