TY  - THES
A1  - Stieglitz, Thomas
T1  - Hydrodynamic Processes in Tropical Mangroves
T1  - Hydrodynamische Prozesse in tropischen Mangroven
N2  - Hydrodynamic processes play a fundamental role in the distribution of salt within mangrove-fringed estuaries and mangrove forests. In this thesis, two hydrodynamic processes and their ecological implications were examined. (1) Passive Irrigation and Functional Morphology of Crustacean Burrows in Rhizophora-forests. The mangrove Rhizophora excludes more than 90% of the seawater salt at water intake at the roots. By means of conductivity methods and resin casting, it was found that crustacean burrows play a key role in the removal of excess salt from the root zone. Salt diffuses from the roots into the burrows, and is efficiently flushed from the burrows by rainwater infiltration and tidal irrigation. The burrows contribute significantly to favourable conditions for the growth of Rhizophora trees. (2) Trapping of Mangrove Propagules due to Density-driven Secondary Circulation in Tropical Estuaries. In North East Australian estuaries, mangrove propagules are drifted upstream by density-driven axial surface convergences. Propagules accumulate in hydrodynamic traps upstream from suitable habitat, where they are trapped at least for the entire tropical dry season. Axial convergences may provide an efficient barrier for propagule exchange across estuaries. In such estuaries, mangrove populations can be regarded as floristically isolated, not unlike island communities, even though the populations lie on a continuous coastline. This effect may contribute to the disjunct distribution observed in some mangrove species. The outcomes of this work contribute to the understanding of the importance of salt as a growth and habitat-restricting factor in the mangrove environment.
KW  - Australien <Nordost>
KW  - Mangrove
KW  - Wurzelraum
KW  - Salzgehalt
KW  - Hydrodynamik
KW  - Ästuar
KW  - Oberflächenströmung
KW  - Samen
KW  - Drift
KW  - mangrove
KW  - hydrodynamics
KW  - salt
KW  - flushing
KW  - burrows
Y1  - 2002
UR  - https://ubt.opus.hbz-nrw.de/frontdoor/index/index/docId/21
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:385-1564
ER  -