- M. Dickey-Collas (1)
- A. Kamstra (1)
- G. Karssen (1)
- J. Komen (1)
- C. Massault (1)
- M. Moens (1)
- H.M.J. Overzee van (1)
- I. Pennock (1)
- E. Peña de la (1)
- M.G. Sassi (1)
- A. Tenghe (1)
- S.V. Tribuhl (1)
- M.J.M. Warmerdam (1)
Discharge regimes, tides and morphometry in the Mahakam delta channel network
Sassi, M.G. - \ 2013
Wageningen University. Promotor(en): Remko Uijlenhoet, co-promotor(en): Ton Hoitink. - [S.l.] : s.n. - ISBN 9789461734679 - 186
delta - afvoer - getijden - kanalen - kanalen, klein - morfometrie - sediment - rivieren - indonesië - deltas - discharge - tides - canals - channels - morphometrics - rivers - indonesia
The Mahakam delta in Indonesia constitutes a text book example of a mixed tide and fluvial dominated delta. Understanding the factors that control the division of water and sediment discharge over channels in the delta is relevant in the contexts of geology, ecology and river engineering. In the Mahakam river and its delta, the tide interacts with the river outflow. River-tide interaction exerts an influence on the discharge regimes and on the division of water and sediment at the bifurcations in the delta. Bifurcations control the dispersal of sediments that eventually govern the shape and evolution of the delta. In this thesis, spatial and temporal aspects of delta evolution are shown to be reflected in scaling relations between the geometric properties of delta channels and the discharge conveyed by the channels, which is known as downstream hydraulic geometry (HG). Downstream HG relations as established in this research, feature a transition from the landward part to the seaward part of the delta characterized by a clear break in scaling behavior. The variation of river discharge throughout the network is largely impacted by river-tide interaction, which is captured by downstream HG relations.
Heritability of shape in common sole, Solea solea, estimated from image analysis data
Blonk, R.J.W. ; Komen, J. ; Tenghe, A. ; Kamstra, A. ; Arendonk, J.A.M. van - \ 2010
Aquaculture 307 (2010)1-2. - ISSN 0044-8486 - p. 6 - 11.
quantitative genetic-parameters - oreochromis-niloticus l. - large rainbow-trout - salmon salmo-salar - body measurements - fillet traits - color - morphometrics - quality - growth
The spider crab Maja squinado is an endangered Mediterranean species; therefore, culturing it successfully is essential for developing restocking programs. The survival, growth and development of post-larval stages (juvenile crabs, C1–C8) were studied using larvae obtained from adult individuals collected in the Catalan Sea. The juvenile crab stages were cultured individually from a megalopal stage using a semi-open recirculation system to obtain the precise growth data of each juvenile crab stage until C8. Development up to C8 at 20 °C lasted 154 ± 10 days. Survival from C1 to C8 was 5.8%. Moult increment values in cephothoracic length were similar in all the crab stages (21–35%). Intermoult duration (9 ± 1 in C1–C2 to 51 ± 8 days in C7–C8) increased sharply from juvenile stage 5. Males and females can be distinguished from C4 based on sexual dimorphism in the pleopods and the presence of gonopores. The allometric growth of the pleon is sex-dependent from C4, with females showing positive allometry and males isometric growth. The juvenile growth rate was lower compared with that of the previously studied Atlantic species Maja brachydactyla.
Use of genomic information in mass-spawning fish
Massault, C. - \ 2010
Wageningen University. Promotor(en): Johan van Arendonk, co-promotor(en): Henk Bovenhuis; D.J. de Koning. - [S.l. : S.n. - ISBN 9789085856887 - 172
loci voor kwantitatief kenmerk - aquacultuur - dicentrarchus labrax - pagrus aurata - kuitschieten - morfometrie - stressreactie - pasteurellose - selectief fokken - genexpressieanalyse - diergenetica - quantitative trait loci - aquaculture - spawning - morphometrics - stress response - pasteurellosis - selective breeding - genomics - animal genetics
This thesis uses the current genetic and genomic resources to permit genetic improvement of stress response in European sea bass and disease resistance in gilthead sea bream, two traits of economical importance. One way to integrate such genetic knowledge into breeding programmes, is to detect for quantitative trait loci (QTLs), which are regions of the genome influencing a specific trait. The first step was to design successful experiments to detect QTLs in aquaculture species. The next part of the thesis focuses on QTL mapping in natural mating mass-spawning species, which have complex population structure (variable family sizes). Finally, the possibilities of using genomic selection for mass-spawning species, where natural mating is used, were investigated.
Norwegian Sea Herring Stock Discrimination phase I (NORDISI)
Overzee, H.M.J. van; Dickey-Collas, M. ; Pennock, I. ; Tribuhl, S.V. ; Bierman, S.M. ; Damme, C.J.G. van; Warmerdam, M.J.M. - \ 2009
IJmuiden : IMARES (Report / MARES Wageningen UR no. C142/09) - 28
visserij - haringen - morfometrie - soortverschillen - monitoring - zeevisserij - biologische monitoring - fisheries - herrings - morphometrics - species differences - marine fisheries - biomonitoring
There is growing concern among fishermen about the migration of North Sea herring into the Norwegian Sea. The Pelagic Freezer-trawler Association therefore commissioned IMARES to develop a technique to monitor possible catches of North Sea herring in the Norwegian Sea. This technique will use morphometric (shape) differences in herring to distinguish between Norwegian Sea spawning herring and North Sea herring. The results show that the model is able to distinguish Norwegian spring spawning herring from North Sea autumn or winter spawning herring. Overall we can conclude that even though we still have to overcome some methodological problems we are confident that this research constitutes a first step towards developing a technique to monitor catches of herring from the Norwegian Sea for Norwegian Spring spawning or other herring.
Description of Pratylenchus dunensis sp. n. (Nematoda: Pratylenchidae), a root-lesion nematode associated with the dune grass Ammophila arenaria (L.) Link
Peña, E. de la; Moens, M. ; Aelst, A.C. van; Karssen, G. - \ 2006
Nematology 8 (2006)1. - ISSN 1388-5545 - p. 79 - 88.
dutch coastal foredunes - molecular characterization - knot nematode - competition - descriptions - morphology - morphometrics - new species - plant pests - ribosomal DNA - wild relatives - Ammophila arenaria - Elymus farctus - Pratylenchus - Ammophila - Poaceae - Cyperales - monocotyledons - angiosperms - Spermatophyta - plants - eukaryotes - Elymus - invertebrates - animals - Pratylenchidae - nucleotide sequences - plant parasitic nematodes - nematoda - restriction fragment length polymorphism - intergenic DNA - taxonomy - beschrijvingen - morfologie - morfometrie - nieuwe soorten - plantenplagen - ribosomaal DNA - wilde verwanten - eenzaadlobbigen - bedektzadigen - planten - eukaryoten - ongewervelde dieren - dieren - nucleotidenvolgordes - plantenparasitaire nematoden - Nematoda - restrictiefragmentlengtepolymorfisme - intergeen DNA - taxonomie
A root-lesion nematode, Pratylenchus dunensis sp. n., is described and illustrated from Ammophila arenaria (L.) Link, a grass occurring abundantly in coastal dunes of Atlantic Europe. The new species is characterised by medium sized (454-579 ¿ m) slender, vermiform, females and males having two lip annuli (sometimes three to four; incomplete incisures only visible with scanning electron microscopy), medium to robust stylet (ca 16 ¿ m) with robust stylet knobs slightly set off, long pharyngeal glands (ca 42 ¿ m), lateral field with four parallel, non-equidistant, lines, the middle ridge being narrower than the outer ones, lateral field with partial areolation and lines converging posterior to the phasmid which is located between the two inner lines of the lateral field in the posterior half of the tail, round spermatheca filled with round sperm, vulva at 78% of total body length and with protruding vulval lips, posterior uterine sac relatively short (ca 19 ¿ m), cylindrical tail (ca 33 ¿ m) narrowing in the posterior third with smooth tail tip and with conspicuous hyaline part (ca 2 ¿ m). Males occur abundantly and present similar characteristics except for smaller dimensions for all morphological characters, but the head region is more truncated in outline than the female, spicule length is ca 15 ¿ m and testis length is ca 195 ¿ m. Nucleotide sequences of the rDNA expansion region D2D3 differed from the morphologically similar species P. penetrans and P. brzeskii that also occur in coastal dunes. These differences are supported by PCR-RFLP of the ITS-rDNA. Pratylenchus dunensis sp. n. was also found parasitising roots of Elymus farctus Viv.