Die Embryonalentwicklung der Paradiesschnecke ... - TOBIAS-lib

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Kapitel 3 Fig. 5 10 : Images of platinum-plus-heat-exposed embryos. Left lateral views, circles highlight the portion of calcium carbonate that was secreted before the re-start of the differential growth of the shell gland-mantle edge-complex; A: 7-day-old embryo; B: 10-day-old embryo; CN: ctenidium; F: foot; H: head; MTE: mantle edge; SH: shell; VS: visceral sac. be completely surrounded by the mantle gap and the lobe. The mantle gap also contains calcium carbonate, forming the part of the external shell that remains covered by the lobe. The “partly-shelled” snails do not only experience a new growth impuls, they also show some shell coiling (Figures 4D, E, Figure 6B, Figures 6B, C, F). However, the coils of these shells are not as tight as in control snails. Comparison of embryogenesis in normal, “sluggish” and “partly-shelled” M. cornuarietis In Figure 7 sketches of selected developmental stages of the differently treated snails are depicted. The top row shows the normal development (Marschner et al., 2012). At the age of three days, the mantle anlage and the shell gland are positioned on the left side of the visceral sac. During further development, differential growth of the distal parts of the mantle anlage and the shell gland leads to an overgrowing of the visceral sac and an enfolding of the epi<strong>der</strong>mal tissue of the right side of the visceral sac into the mantle cavity. Thus, the shell gland moves its orientation from being located parallel to the longitudinal body axis to being located perpendicular to the axis. After this rotation, mantle, shell gland, and mantle edge keep growing; the dorsal parts of the respective tissues grow to a greater extent than the ventral parts 88
Kapitel 3 Fig. 6: Histological sections of M. cornuarietis embryos. Asterisks indicate corresponding structures; A: Sagittal section of a cephalopodium of a control snail, 12 days after oviposition, left lateral view; B: Sagittal section of a platinum-plus-heat-exposed snail, 12 days after oviposition, right lateral view; C: Sagittal section of a platinum-plus-heat-exposed snail, 17 days after oviposition, right lateral view; D: Horizontal section of a platinumplus-heat-exposed snail, 17 days after oviposition; E: same individuum as in D, section more dorsal; F: Sagittal section of a platinum-plus-heat-exposed snail, 12 days after oviposition; CML: columellar muscle; CN: ctenidium; DG: digestive gland; E: eye; F: foot; H: head; MTC: mantle cavity; MTE: mantle edge; MTG: mantle gap; O: odontophor; SHG: shell gland. and thus the animal coils. In “sluggish” snails, shown in the bottom row of the sketches in Figure 7, the differential growth is limited to the mantle anlage. Mantle edge and shell gland arrest growth and, therefore, do not overgrow the visceral sac. Simultaneously, however, the mantle anlage keeps growing and invaginates into the body. The arrested mantle edge and shell 89
Page 1 and 2:
Die Embryonalentwicklung der Paradi
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Inhaltsverzeichnis Zusammenfassung
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Zusammenfassung Hintergrund und Zie
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Hintergrund und Zielsetzung der Arb
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Hintergrund und Zielsetzung der Arb
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Material und Methoden Marisa cornua
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Material und Methoden Hälterung Di
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Material und Methoden lindividuen a
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Ergebnisse lung von Marisa cornuari
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Ergebnisse Kapitel 3: Marschner, L.
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Ergebnisse Wachstum des Columellamu
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Diskussion Naticidae) entwickelt si
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Diskussion engrailed und dpp-BMP2/4
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Diskussion Abb. 4: Vergleich der mi
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Schlussfolgerung perimentell zu unt
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Literatur Engelhardt, W. (2008). Wa
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Literatur Ponder, W. F. und Lindber
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Kapitel 1:Turning snails into slugs
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Kapitel 1 dae). Their ontogeny also
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Kapitel 1 Exposure experiments Test
Page 41 and 42: Kapitel 1 et al. (2001, 2003) or wi
Page 43 and 44: Kapitel 1 for 4 × 5 min with PTw (
Page 45 and 46: Kapitel 1 treatment 29.9 ± 32.78%
Page 47 and 48: Kapitel 1 Fig. 2 3 : Images of M. c
Page 49 and 50: Kapitel 1 Fig. 4 4 : Location of th
Page 51 and 52: Kapitel 1 internal solid circular s
Page 53 and 54: Kapitel 1 ietis as it was shown for
Page 55 and 56: Kapitel 1 Burnett, L.E., Woodson, P
Page 57 and 58: Kapitel 1 Page, L.R., 2002. Ontogen
Page 59 and 60: Kapitel 2: Arresting mantle formati
Page 61 and 62: Kapitel 2 tropods (Crofts, 1937, su
Page 63 and 64: Kapitel 2 Scanning electron microsc
Page 65 and 66: Kapitel 2 called “mantle anlage
Page 67 and 68: Kapitel 2 Fig. 2: M. cornuarietis,
Page 69 and 70: Kapitel 2 and the visceral sac rema
Page 71 and 72: Kapitel 2 Seven-day-old embryos At
Page 73 and 74: Kapitel 2 Fig. 7: M. cornuarietis,
Page 75 and 76: Kapitel 2 gation of internal shells
Page 77 and 78: Kapitel 2 first tended to invaginat
Page 79 and 80: Kapitel 2 side of the visceral sac
Page 81 and 82: Kapitel 2 cornuarietis (Mesogastrop
Page 83 and 84: Kapitel 3: External and internal sh
Page 85 and 86: Kapitel 3 during embryonic developm
Page 87 and 88: Kapitel 3 Differential growth of ma
Page 89 and 90: Kapitel 3 sac, facing away from the
Page 91: Kapitel 3 Fig. 4 9 : SEM-images of
Page 95 and 96: Kapitel 3 side of the visceral sac
Page 97 and 98: Kapitel 3 different mechanism that
Page 99 and 100: Kapitel 3 whether the inhibition of
Page 101 and 102: Kapitel 3 tinuum of gradual morphol
Page 103 and 104: Kapitel 3 served one. However, ther
Page 105 and 106: Kapitel 3 hand and modified in Inks
Page 107 and 108: Kapitel 3 ticipated in designing th
Page 109 and 110: Kapitel 3 Demian, E. S. and Yousif,
Page 111 and 112: Kapitel 3 Page, L. R. (2003). Gastr
Page 113 and 114: Kapitel 4 Herewith, we were able to
Page 115 and 116: Kapitel 4 Histology and 3D reconstr
Page 117 and 118: Kapitel 4 72 or 96 hours at 6 ◦ C
Page 119 and 120: Kapitel 4 tioned on the ventral sid
Page 121 and 122: Kapitel 4 P2 does not curve backwar
Page 123 and 124: Kapitel 4 which this nerve is attac
Page 125 and 126: Kapitel 4 Fig. 5 13 : 3D reconstruc
Page 127 and 128: Kapitel 4 system in which the right
Page 129 and 130: Kapitel 4 ready present during tors
Page 131 and 132: Kapitel 4 Haydon, P. G., McCobb, D.
Page 133 and 134: Kapitel 5: Quantifikation der Hsp70
Page 135 and 136: Kapitel 5 Die Gesamtproteinmenge wu
Page 137 and 138: Kapitel 5 steigt mit steigendem pro
Page 139 and 140: Kapitel 5 Piano, A., Valbonesi, P.,
Page 141 and 142: Publikationsliste • Marschner, L.
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