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62 results for “Diadema”
Virgin Islands National Park: Coral Reef: Population Dynamics: Diadema antillarum
A potential consequence of individuals compensating for density-dependent processes is that rare or infrequent events can produce profound and long-term shifts in species abundance. In 1983–1984 a mass mortality event reduced the numbers of the abundant sea urchin Diadema antillarum by 95–99% throughout the caribbean and western atlantic. Following this event, the abundance of macroalgae increased and the few surviving D. antillarum responded by increasing in body size and fecundity. these initial observations suggested that populations of D. antillarum could recover rapidly following release from food limitation. In contrast, published studies of field manipulations indicate that this species had traits making it resistant to density-dependent effects on offspring production and adult mortality; this evidence raises the possibility that density-independent processes might keep populations at a diminished level. Decadal scale (1983–2011) monitoring of recruitment, mortality, population density and size structure of D. antillarum from st John, us Virgin Islands, indicates that population density has remained relatively stable and more than an order of magnitude lower than that before the mortality event of 1983–1984. We detected no evidence of density-dependent mortality or recruitment since this mortality event. In this location, model estimates of equilibrium population density, assuming density-independent processes and based on parameters generated over the first decade following the mortality event, accurately predict the low population density 20 years later (2011). We find no evidence to support the notion that this historically dominant species will rebound from this temporally brief, but spatially widespread, perturbation.
MCR LTER: Coral Reef: Diadema predation and recruitment in Moorea, French Polynesia
These are field data from Moorea, French Polynesia regarding the population dynamics of Diadema savignyi. Data were collected during the austral winters in 2009 and 2010. Four datasets are provided: (1) recruitment data of Diadema savignyi over the course of ~9 weeks during the austral winter of 2010, (2) predation data of adult Diadema using a tethering experiment, (3) urchin abundance surveys for 2009 and 2010, and (4) a 9 week weekly survey of newly recruited Diadema (test diameter). These data are part of a PhD dissertation, "Herbivore Community Dynamics and Functional Compositions in Moorea, French Polynesia", 2014, published by ProQuest.
Figure 11. a. Diadema savignyi, b. Echinothrix calamaris, c. Tripneustes gratilla, d in Echinodermata of Lakshadweep, Arabian Sea with the description of a new genus and a species
Figure 11. a. Diadema savignyi, b. Echinothrix calamaris, c. Tripneustes gratilla, d. Echinometra mathaei, with olive-green spines, e. Echinometra mathaei, with black spines, f. Stomopneustes variolaris.
Figure 9. A. Eryx jayakari. B. Lytorhynchus diadema. C. Platyceps ventromaculatus. D. Malpolon moilensis. E. Psammophis schokari. F in Reptiles and Amphibians along the Coastal Area of the Eastern Province, Saudi Arabia
Figure 9. A. Eryx jayakari. B. Lytorhynchus diadema. C. Platyceps ventromaculatus. D. Malpolon moilensis. E. Psammophis schokari. F. Cerastes gasperetti.
Fig. 4 in Taxonomic Re-Evaluation Of Sarika Diadema (Dall, 1897) And S. Asamurai (Panha, 1997), Two Endemic Land Snails From Thailand (Pulmonata: Ariophantidae: Macrochlamydinae)
Fig. 4. Radula morphology. Sarika diadema from Botanic Garden, Trang: A, central tooth with first to third lateral teeth; B, lateral teeth with bicuspid marginal teeth transition; C, outermost marginal teeth. Sarika asamurai from Klong Phanom National Park, Suratthani: D, central tooth with first and second lateral teeth; E, lateral teeth with bicuspid marginal teeth transition; F, outermost marginal teeth. Numbers indicated order of lateral and marginal teeth. Central tooth indicated by 'C'.
Fig. 1 in Taxonomic Re-Evaluation Of Sarika Diadema (Dall, 1897) And S. Asamurai (Panha, 1997), Two Endemic Land Snails From Thailand (Pulmonata: Ariophantidae: Macrochlamydinae)
Fig. 1. The collecting sites of S. diadema (■) and S. asamurai (●) within southern Thailand. Shading represents mountainous areas with an altitude higher than 50 m (light grey) and 500 m (dark grey).
Fig. 2 in Taxonomic Re-Evaluation Of Sarika Diadema (Dall, 1897) And S. Asamurai (Panha, 1997), Two Endemic Land Snails From Thailand (Pulmonata: Ariophantidae: Macrochlamydinae)
Fig. 2. Sarika diadema from Khao Poo-Khao Ya National Park, Pattalung: A, shell morphology; B, body colour in live specimen. Sarika asamurai from Ban Takun, Suratthani: C, shell morphology; D, body colour in live specimen.
Fig. 3 in Taxonomic Re-Evaluation Of Sarika Diadema (Dall, 1897) And S. Asamurai (Panha, 1997), Two Endemic Land Snails From Thailand (Pulmonata: Ariophantidae: Macrochlamydinae)
Fig. 3. Genitalia and jaw of S. diadema and S. asamurai. Sarika diadema from Botanic Garden, Trang: A, whole genital system; B, interior structure of penis; C, single spermatophore with detail of spines between sperm sac and tail filament; D, arrangement of three spermatophores in gametolytic sac; E, jaw. Sarika asamurai from Klong Phanom National Park, Suratthani: F, whole genital system; G, internal structure of penis; H, spermatophore with detail of spines between sperm sac and tail filament and cross section of tail filament; I, jaw. Abbreviations used in the figures are listed under 'anatomical abbreviations' in the materials and methods
FIG. 4 in Taxonomic significance of test morphology in the echinoid genera Diadema Gray, 1825 and Echinothrix Peters, 1853 (Echinodermata)
FIG. 4. — Cluster analysis based on 28 test characters (zero Euclidean distance = greatest similarity). Abbreviations: b, brown colour morph; w, white colour morph.
FIG. 2. — A-I in Taxonomic significance of test morphology in the echinoid genera Diadema Gray, 1825 and Echinothrix Peters, 1853 (Echinodermata)
FIG. 2. — A-I, photographs of the median areas of the interambulacra, showing the variation in characters that occur: A, Diadema antillarum; B, D. mexicanum; C, D, D. savignyi; E, D. setosum; F, Echinothrix calamaris (brown colour morph); G, E. calamaris (white colour morph); H, E. diadema; I, D. palmeri; J, D. palmeri (whole specimen). Scale bars: A-I, 5 mm; J, 50 mm.
FIG. 1 in Taxonomic significance of test morphology in the echinoid genera Diadema Gray, 1825 and Echinothrix Peters, 1853 (Echinodermata)
FIG. 1. — Drawings of the apical systems, showing species specific characters of the periproct and genital plates: A, Diadema antillarum; B, D. ascensionis; C, D. mexicanum; D, D. palmeri; E, D. paucispinum; F, D. savignyi; G, D. setosum; H, Echinothrix calamaris (brown colour morph); I, E. calamaris (white colour morph); J, E. diadema. Scale bars: 5 mm.
Figure 8 Shells. A–C. Taphrenalla diadema. A. specimen CUMZ 7175. B. specimen CUMZ 7177. C. specimen CUMZ 7171 showing channel-shaped suture with wide bottom. D, E. T in Integrative systematics reveals the new land-snail genus Taphrenalla (Eupulmonata: Ariophantidae) with a description of nine new species from Thailand
Figure 8 Shells. A–C. Taphrenalla diadema. A. specimen CUMZ 7175. B. specimen CUMZ 7177. C. specimen CUMZ 7171 showing channel-shaped suture with wide bottom. D, E. T. dalli sp. nov. D. holotype CUMZ 7183. E. specimen CUMZ 7189 showing channel-shaped suture with very wide bottom. Inset SEM image showing shell sculpture of each species.
FIG. 3 in Taxonomic significance of test morphology in the echinoid genera Diadema Gray, 1825 and Echinothrix Peters, 1853 (Echinodermata)
FIG. 3. — MDS plots of taxonomic similarity based on 28 test characters.
Impacts of hurricanes and disease on Diadema antillarum in shallow water reef and mangrove locations in St John, USVI
<p>Number of Diadema antillarum per 10x2 m2 transect at 9 reef sites and 3 mangrove sites in St John USVI from 2017-2023</p>
Diadema mortality data for Ecol&Evol paper Mar 2020
<p>These data have been used for the analysis and figure 2 of the Ecology and Evolution 2020 paper</p>
FIGURE 4 in The Ophryotrocha diadema group (Annelida: Dorvilleidae), with the description of two new species
FIGURE 4. SEM images of Ophryotrocha alborana, sp. nov.. A, complete adult, dorsal view; B, same, ventral view; C, anterior end, dorsal view; D, same, ventral view; E, posterior end, dorsal view; F, enlargement of last five chaetigers to show mammillate rosette glands, dorsal view; G, mandibles of 14-chaetiger worm, dorsal view; H, same of 13-chaetiger worm, ventral view; I, P2-maxillae of 14-chaetiger animal, ventral view; J, same, dorsal view. G–J by M.O. Macnaughton.
FIGURE 2 in The Ophryotrocha diadema group (Annelida: Dorvilleidae), with the description of two new species
FIGURE 2. SEM images of Ophryotrocha diadema. A, anterior end, dorsal view; B, same, ventral view; C, posterior end, dorsal view; D, enlargement of last two chaetigers to show mammillate rosette glands, dorsal view; E, median parapodium; F, chaetae of same; G, enlarged rosette gland to show perforated top.
FIGURE 6 in The Ophryotrocha diadema group (Annelida: Dorvilleidae), with the description of two new species
FIGURE 6. Maxillary apparatuses of Ophryotrocha birgittae, sp. nov.. A, Larval maxillae (L) of 4-chaetiger worm, dorsal view; B, Juvenile maxillae (P1) of 11-chaetiger worm, dorsal view; C, Adult maxillae (P2) of 13-chaetiger worm, dorsolateral view. Abbreviations: F, forceps; numerals refer to anterior denticles.
FIGURE 3 in The Ophryotrocha diadema group (Annelida: Dorvilleidae), with the description of two new species
FIGURE 3. Mandibles and maxillary forceps, dorsal views. Ophryotrocha diadema (A–C). A, Mandibles of 4-chaetiger worm; B, same of 19-chaetiger worm; C, maxillary forceps of 19-chaetiger worm. Ophryotrocha alborana, sp. nov. (D–F). D, Mandibles of 5-chaetiger worm; E, same of 20-chaetiger worm; F, maxillary forceps of 20-chaetiger worm. Ophryotrocha birgittae, sp. nov. (G–I). G, Mandibles of 4-chaetiger worm; H, mandibles of 19-chaetiger worm; I, maxillary forceps of 19-chaetiger worm.
FIGURE 1 in The Ophryotrocha diadema group (Annelida: Dorvilleidae), with the description of two new species
FIGURE 1. Photographs of live animals, dorsal view. A, Ophryotrocha diadema; B, Ophryotrocha alborana, sp. nov.; C, Ophryotrocha birgittae, sp. nov.
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Allen Brain Atlas
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