Jul 14, 2016 - adaptation across populations illustrates the limita- tions of applying .... American lobster swimming behaviour in response to environment and ...
This contribution discusses the potentials and pitfalls of using settlement ... larval collectors assume that settlement rate is only influenced by the rate of arrival of.
May 11, 2011 - S. M. C. Robinson ... anchovy (09ConnelB 1976, 1980), and jack mackerel (Thei- ... cs of Hmal Pacific herring (S. M. C. Robinson, in.
Sep 16, 2017 - for the first time the planktonic part of their life history, their selection of host corals and settlement, and plasticity within the ensuing color ...
Sep 16, 2017 - Abstract. Pygmy seahorses are among the most charismatic inhabitants of coral reefs. ... The pair mated in their aquarium and gave birth to three broods of offspring. We raised a ..... feedings to thrive in aquaria. Muricella ...
Apr 15, 2008 - development of two species of host sea anemone, Heterac- tis crispa and ... viding important insights into the early life stages of these species and ... Each aquarium contained a set- ..... Oxford University Press, Melbourne,.
Jun 22, 2015 - 2002), Uca pugnax (see O'Connor and Van 2006),. U. vocator (see Simith et al. 2010) and Ucides cordatus (see. Diele and Simith 2007; Simith ...
Settlement of mussels is commonly associated with macroalgae. The effects of 19 macroalgal species on the settlement and metamorphosis of pediveliger ...
Larval and Postlarval White Shrimp Penaeus setiferus. (Crustacea, Decapoda, Penaeidae) ... decapod crustaceans: all larval stages are free swimming,.
We quantified the effects of temperature on the color of the salamander sister species. Ambystoma barbouri and Ambystoma texanum over larval ontogeny.
larval settlement on small spatial scales is mediated by biotic and abiotic ... many marine polychaetes require specific cues to settle and metamorphose.
(1), larval development in captivity, (2) settlement on artificial structures in captivity(3), and transfer to grow-out .... Permanent settlement only on the adults, while ...
Feb 4, 2018 - inherent to the psyche as it develops in determination from, and towards engagement with, mental representations (Winfield 2015). Given this ...
than once; components of the first and second copulation do not differ. On average, the ... Seventeen copulations were observed and analysed. La- tency (the ...
February 1993 in five pools of the upper Rio Paraná floodplain and in one site in the ... Five pools were sampled in this investigation (Fig. .... to this mode of life.
Huntsman Marine Science Centre, in St. Andrews, New .... Klein-Breteler WCM, Gonzalez SR (1982) Influence of cultiva- ... Editorial responsibility: Jon Hare,.
than the larval swimming speed had no effect on the settlement success of these 4 ... Larvae of all 4 species preferred shaded sites at settlement in flumes.
Oct 14, 2015 - Marine ecologists have often proposed that wind- driven currents in coastal upwelling regions strongly affect nearshore larval settlement, ...
grained sediments along the mainland shelf from northern California to Baja. California ... Center, University of Southern California, P. O. Box 398,. A valon.
Although reef fish larvae are known to display behavioral adaptations that influence settlement site selection, little is known about the development of behavioral ...
of the substratum (e.g. Crisp & Ryland 1960, Pernet et al. 2003, Dobretsov & Wahl 2008). Consequently, vari- ability of settlement behaviour may be as indicative ...
ABSTRACT: This study examined the inhibition of Hydroides elegans larval settlement by brown algal phlorotannins as well as 2 related compounds, tannic acid ...
Jan 10, 2017 - quantified variation in larval survivorship and settlement rates for CoTS ... CoTS larvae were recorded to settle 17â43 days post-fertilization,.
(1883) (see review in GAUNT & GAUNT, 1978). Even the research on the ontogenetic development of adult rudist bivalves is mainly based on serial-sec- tions.
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Larval Settlement and Ontogenetic Development of Hippuritella vasseuri (DOUVILLÉ) (Hippuritoidea, Bivalvia) Stefan GÖTZ
Key words: Cretaceous, Palaeobiology, Rudists, Larvae, Ontogeny. Abstract An entire bouquet of some 250 specimens of Hippuritella vasseuri (DOUVILLE) was mapped three dimensionally, based on ascending serial sections spaced at 1 mm, in order to evaluate the earliest ontogenetic development in hippuritid rudists. This method supplied more than 5000 cross-cuts through rudist specimens of different ontogenetic stages beginning from 0.05 mm, and in vertical view, objects >0.9 mm were evaluated. Our data-set reveals the presence of 145 rudist settlers throughout the bouquet. A majority of them died at very juvenile ages and provide numerous nearcommissure sections of the early ontogenetic growth
stages. The rudist packing density reaches 85–88% of the total area and is thus very high. Dark brown homogenous wackestone fills interstitial areas and some rudist cavities throughout the sample. Hence, a strong colour contrast is present between interstitial sediment and the pale white rudist shells which makes identification easy, even of tiny rudist individuals and larvae. Dissolution seams and nests of neomorphic spar affected less than 3% of the sample volume. Most rudist cavities are filled by dog-tooth spar cement and a second generation of blocky calcite spar, or they keep their primary porosities that are lined with dog-tooth spar. Early marine calcitic cement may also be present covering the outer rims of rudist shells. The aragonitic (inner) hippuritid shell layer is diagenetically altered to blocky calcite spar, but the low magnesium calcite (LMC) outer shell layer still retains the original fibrous prismatic ultrastructure.
Fig. 2 Ascending series (drawing) of cross sections showing two specimens of Hippuritella vasseuri (DOUVILLÉ) that died very early. For original scans see Plate 1, Figs. 12 and 13. Grey: original aragonitic shell; black: low magnesium calcite (LMC) shell. Upper part: a: larval stage; b: baby-teeth stage; c, d: first calcite stage; e–g: first pillar stage. Sectioning is slightly oblique. Lower part: a: larval stage; b–d: baby teeth stage; e: first calcite stage. Scale-bar is 1 mm.
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Fig. 3 Summary of the ontogenetic stages of Hippuritella vasseuri (DOUVILLÉ) described here. Left column: growth stages, dimensions and scale-bars. Centre column: drawings of selected examples. Right column: short description of the salient features of each growth stage. See text for further explanations.
3. ONTOGENETIC DEVELOPMENT Based on our set of 60 high resolution scan images, we received more than 5000 cross-section pictures of rudist individuals. Naturally, most of them are 1 mm ascending serial-cuts through adult rudist specimens, from apex to free valve. But we also received numerous serial-cuts through individuals that died early, and near-commissure cross cuts were obtained of individuals beginning from
