Middle Devonian trilobites from the Mont d’Haurs section in Givet, France, with two new species of <i>Dechenella</i>

Bignon, Arnaud; Crônier, Catherine

doi:10.1017/s175569101100925x

Cited by 2 publications

(4 citation statements)

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“…Ecophenotypic plasticity may be also a plausible explanation. For example the trilobite species Dechenella ziegleri Struve, of the Terres d'Haurs formation (Hubert ; Bignon & Crônier ) is encountered both in the biostromal lagoon (Table ; environment 6), and the median (Table ; environment 7) and internal ramps (Table ; environment 9) or the ostracod Polonellia tertia Krömmelbein, mostly found in open marine environments may occur in the algal euphotic zone (Casier et al . ,b).…”

Section: Discussionmentioning

confidence: 97%

“…A great number of nutrition modes are possible within trilobites (Fortey & Owens 1999). The genus Dechenella corresponds to more than 90% of the specimens found in the Mont d'Haurs section and they have been reported as detritivores (Bignon & Crônier 2011). Many feeding habits exist within gastropods too, predators, filter feeders, parasites, herbivores (Lecointre & Le Guyader 2006).…”

Section: Palaeotrophic Levelsmentioning

confidence: 99%

“…For example the trilobite species Dechenella ziegleri Struve, 1992 of the Terres d'Haurs formation (Hubert 2008a;Bignon & Crônier 2011) is encountered both in the biostromal lagoon (Table 1; (Casier et al 2011a, b). Likewise, the genetic component may explain these results.…”

Section: Alternation Between the Mixed Ramp And The Carbonate Shelfmentioning

confidence: 99%

“…The present work focuses on the Mont d'Haurs section at Givet, in the French Ardennes (Bignon & Crônier ). This historic section of the Givetian is located on the southwestern border of the Dinant Synclinorium (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

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Siliciclastic-carbonate ramp, a hostile world for carbonate shelf fauna? The example of the Givetian Ardenne Platform

Bignon

Crônier

Hubert

2017

LET

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The Givetian platform of the Ardennes Massif records several alternations between a siliciclastic‐carbonate ramp and a carbonate shelf. Usually these depositional contexts are considered as a major disruption implying a perturbation of many ecological parameters. We established the impact of these variations on the biodiversity structure through the study of the trophic organisation. Thanks to a previous microfacies analysis, 550 levels of the Mont d'Haurs section in Givet and ten associated environments were precisely defined. Seven palaeotrophic levels are recognized from micropalaeontological data, including benthic, planktonic, heterotroph and autotroph organisms. The spatial and temporal distributions of these levels have been analysed through means of multivariate analyses. The statistic results show that the distribution of the palaeotrophic levels during periods characterized by a mixed ramp is not significantly different than during carbonate shelf influences. These environmental modifications do not affect the community‐type. These results support recent studies performed on different benthic communities occurring in the Givetian of the Ardennes Massif. Indeed, trilobite and ostracod faunas of this period appear more affected by global environmental changes as the Kačák (uppermost Eifelian) and Taghanic (late middle Givetian) events. Moreover, along the proximal‐distal transect on the platform, the reef constitutes the most singular environment. However, contrary with the Frasnian reefs of the Ardennes Massif, which consist of carbonate mud mounds laying on a deep mixed ramp, there is no trilobite community that appears restricted to Givetian reefs. Thus global bioevents during the Middle Devonian have a more important control on the biodiversity than the platform morphology. These results support the view that at wide scales (spatial and temporal), the biodiversity responds more positively to ecological disturbances.

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Section: Discussionmentioning

confidence: 97%

Section: Palaeotrophic Levelsmentioning

confidence: 99%

Section: Alternation Between the Mixed Ramp And The Carbonate Shelfmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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