Environmental Conditions, Growth and Production of Anadara Senilis (Linnaeus, 1758) in a Senegal Lagoon

Debenay, Jean-Pierre; Tack, D. Leung; Ba, M. Abdoull; Sy, I.

doi:10.1093/mollus/60.2.113

Cited by 15 publications

(14 citation statements)

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“…Median growth rate is significantly lower in A. devincta from Community 3 regardless of the age marker or growth rate metric used (Mann-Whitney, p<0.05; Figure 3 ; Table S4 ). Internal and external growth breaks often correspond with δ 18 O maxima (winter low temperatures) suggesting growth breaks are annual, consistent with the extant A. senilis in which growth breaks occur annually during the winter [74] . One exceptional fossil specimen of A. devincta had an “extra” break between the third and fourth δ 18 O maxima and other specimens had more δ 18 O maxima than growth breaks.…”

Section: Resultssupporting

confidence: 76%

Individual to Community-Level Faunal Responses to Environmental Change from a Marine Fossil Record of Early Miocene Global Warming

Belanger

2012

PLoS ONE

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Modern climate change has a strong potential to shift earth systems and biological communities into novel states that have no present-day analog, leaving ecologists with no observational basis to predict the likely biotic effects. Fossil records contain long time-series of past environmental changes outside the range of modern observation, which are vital for predicting future ecological responses, and are capable of (a) providing detailed information on rates of ecological change, (b) illuminating the environmental drivers of those changes, and (c) recording the effects of environmental change on individual physiological rates. Outcrops of Early Miocene Newport Member of the Astoria Formation (Oregon) provide one such time series. This record of benthic foraminiferal and molluscan community change from continental shelf depths spans a past interval environmental change (∼20.3-16.7 mya) during which the region warmed 2.1–4.5°C, surface productivity and benthic organic carbon flux increased, and benthic oxygenation decreased, perhaps driven by intensified upwelling as on the modern Oregon coast. The Newport Member record shows that (a) ecological responses to natural environmental change can be abrupt, (b) productivity can be the primary driver of faunal change during global warming, (c) molluscs had a threshold response to productivity change while foraminifera changed gradually, and (d) changes in bivalve body size and growth rates parallel changes in taxonomic composition at the community level, indicating that, either directly or indirectly through some other biological parameter, the physiological tolerances of species do influence community change. Ecological studies in modern and fossil records that consider multiple ecological levels, environmental parameters, and taxonomic groups can provide critical information for predicting future ecological change and evaluating species vulnerability.

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Section: Resultssupporting

confidence: 76%

Individual to Community-Level Faunal Responses to Environmental Change from a Marine Fossil Record of Early Miocene Global Warming

Belanger

2012

PLoS ONE

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“…Although some information is available on the food resources of the studied mollusk species and their interaction with the environment (Patel et al 1978; Debenay et al 1994; Azzoug et al 2012), little is known about their growth histories. Azzoug et al (2012) studied growth patterns and stable isotopes of Anadara sp.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Local Reservoir Age and Stable Isotopes of Shells from Southeast Arabia

et al. 2016

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We recently started a systematic approach to determine the reservoir age in southeast Arabia and its dependence on mollusk species and their environment. This part of the study concentrates on local reservoir age and stable isotopes of the lagoonal species Terebralia palustris and Anadara uropigimelana at Khor Kalba, Oman Sea. Environmental and nutritive influences on mollusks are reflected in the radiocarbon and stable isotope signal. We found a local reservoir age of A. uropigimelana of about 940 yr and that of T. palustris as 800 yr. Sclerochronological analyses yielded information about seasonality of growth and death in A. uropigimelana. The modern shell of Periglypta reticulata shares food resources and habitat with Anadara sp., of which we did not find a modern specimen. It provided information on response to changes in temperature in the lagoonal system needed for suitability as reflecting climatic conditions. We were interested in carbon pathways of the mangrove in Kalba and a mangrove planted anew on a former mangrove sediment in Ajman. Being an obvious source of charcoal and food of T. palustris makes this information necessary. Further analyses will be performed to interpret changes in reservoir age in complex lagoonal systems as reaction to environmental variability.

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“…We discuss here the causes of shell growth variations, their potential effect on bulk isotopic values, and eventually evaluate the accuracy of bulk isotopic analyses in this study. S. senilis is a euryhaline species that has been observed live in salinities ranging from 0 to 60 psu, on intertidal mudflats in coastal lagoons from Mauritania to Angola (Elouard and Rosso 1977;Debenay et al 1994;Azzoug 2012;Lavaud et al 2013) . S. senilis can thus support and record large salinity changes.…”

Section: Accuracy Of Bulk Isotopic Analyses In Senilia Senilis Shellsmentioning

confidence: 99%

“…The study of growth increment thickness and periodic growth lines (sclerochronology) related to lunar tidal cycles observed in S. senilis shells (Fig. 4) allows for a detailed control of growth rate changes or stops through the shell's life (Azzoug et al 2012a;Debenay et al 1994;Lavaud et al 2013). In Mauritania, shell growth rate is lower in the cool season (November-February) (Lavaud et al 2013), while in the Saloum Delta, it is lower during the rainy season (July-September) (Azzoug et al 2012a).…”

Section: Accuracy Of Bulk Isotopic Analyses In Senilia Senilis Shellsmentioning

confidence: 99%

Modern drought conditions in western Sahel unprecedented in the past 1600 years

et al. 2018

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As climate model uncertainties remain very large for future rainfall in the Sahel, a multicentennial perspective is required to assess the situation of current Sahel climate in the context of global warming. We present here the first record of hydroclimatic variability over the past 1600 years in Senegal, obtained from stable oxygen isotope analyses (δ 18 O) in archaeological shell middens from the Saloum Delta. During the preindustrial period, the region was relatively humid, with maximum humidity reached during the period from AD 1500 to AD 1800, referred to as the Little Ice Age. A significant negative link is observed at the centennial scale between global temperature and humidity in the Sahel that is at odds with the expected effects of latitudinal shifts of the intertropical convergence zone during the last millennium. In the context of the past 1600 years, the Western Sahel appears to be experiencing today unprecedented drought conditions. The rapid aridification that started ca. AD 1800 and the recent emergence of Sahel drought from the natural variability point to an anthropogenic forcing of Sahel drying trend. This new long-term perspective suggests that the recovery of Sahel rainfall in the last decade may only result from short-term internal variability, and supports climate models that predict an increase of Sahel drought under future greenhouse climate.

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Environmental Conditions, Growth and Production of Anadara Senilis (Linnaeus, 1758) in a Senegal Lagoon

Cited by 15 publications

References 0 publications

Individual to Community-Level Faunal Responses to Environmental Change from a Marine Fossil Record of Early Miocene Global Warming

Individual to Community-Level Faunal Responses to Environmental Change from a Marine Fossil Record of Early Miocene Global Warming

Investigating the Local Reservoir Age and Stable Isotopes of Shells from Southeast Arabia

Modern drought conditions in western Sahel unprecedented in the past 1600 years

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