Pierrick Bocher

Pierrick Bocher
Université de La Rochelle, La Rochelle, France · UMR LIENSs Littoral Environnement et Sociétés

Dr.

About

85
Publications
13,984
Reads
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1,561
Citations
Additional affiliations
September 2004 - present
La Rochelle Université
Position
  • Maître de conférences
September 2003 - August 2004
NIOZ Royal Netherlands Institute for Sea Research
Position
  • PostDoc Position
September 2001 - August 2003
La Rochelle Université
Position
  • Attaché Temporaire d'Education et de Recherche

Publications

Publications (85)
Article
Full-text available
Installation of offshore wind farms (OWFs) is becoming increasingly important to ensure a reduction in greenhouse gas emissions; however, OWFs also pose a threat to migrating birds and other wildlife. Informed marine spatial planning is therefore crucial, but individual‐based high‐resolution data on bird migration across the sea are currently lacki...
Article
Full-text available
Migration patterns in birds vary in space and time. Spatial patterns include chain, leapfrog and telescopic migration. Temporal patterns such as migration duration, number, and duration of stopovers may vary according to breeding latitude, sex, and season. This study aimed to verify these patterns in a long‐distance migrant, the Eurasian curlew Num...
Article
Full-text available
Little is known on the food and feeding ecology of the soft-plumaged petrel Pterodroma mollis, which is the single gadfly petrel Pterodroma spp. with a circumpolar breeding distribution within the Southern Ocean. Our primary goal was to describe its diet at Kerguelen Islands, which is the southernmost breeding locality of the species. Soft-plumaged...
Article
Full-text available
Understanding environmental factors underlying animal foraging distribution is of major importance in defining priority conservation actions. During their wintering stage, most shorebirds depend on intertidal areas, as foraging grounds, and on supratidal areas, as high tide roosts. The accessibility of foraging areas and food resources is thus limi...
Article
A Bar-tailed Godwit that wintered in France migrates to the Taimyr Peninsula. For the first time, one of the Bar-tailed Godwits wintering on Ré island, western France, has been tracked to the Taimyr peninsula where it (probably) bred. Researchers of University of La Rochelle and of the LPO collaborated from 2015 with the program Limitrack, using GP...
Article
Full-text available
On 9 August 2020, one of 10 tagged Eurasian curlews we tracked with GPS died on Ile Madame, France, and we managed to collect the corpse for further analyses. Our investigation proved that the bird was shot, as x-ray imagery revealed a single lead ball under the bill skin, while the bill had been recently broken. The study of the GPS tracks during...
Article
Full-text available
The Eurasian Curlew is an endangered long-lived shorebird breeding in grassland and moorland, with declining numbers across its range due to habitat loss and former hunting. In this context, any additional adult mortality can have a noticeable impact on population dynamics, hence on extinction risk. We report a case of a GPS-tagged individual which...
Article
Full-text available
The Freshwater Animal Diversity Assessment (FADA) project estimated that freshwater animal species represent 9.5% of the 1.2 million species described. Knowing that freshwater represents only 0.01% of the earth's surface, these wetlands are suitable habitats for a great part of the world's total biodiversity. However, it has been shown that there i...
Article
Full-text available
Precise timing of migration is crucial for animals targeting seasonal resources at locations encountered across their annual cycle. Upon departure, long-distance migrants need to anticipate unknown environmental conditions at their arrival site, and they do so with their internal annual clock. Here, we tested the hypothesis that long-distance migra...
Article
Capsule Migration associations by Eurasian Curlews Numenius arquata are temporary and last for single flight bouts between stopover sites. Aims Migrant shorebirds are known to initiate migration communally, with groups of birds departing simultaneously from wintering or post-breeding fuelling sites, though the duration of such migratory associatio...
Article
Full-text available
Background: Departure decisions in long-distance migratory bird species may depend on favourable weather conditions and beneficial resources at the destination location, overarched by genetic triggers. However, few studies have tried to validate the significance of these three concepts simultaneously, and long-term, high-resolution tagging dataset...
Article
Full-text available
Habitat selection is an important process in birds that influences individual survival and fitness, and ultimately shapes population dynamics. As a consequence, strong selective pressures apply to favor strategies allowing individuals to choose high-quality habitat for foraging while reducing predation risk and competition. In long-distance migrato...
Article
Full-text available
Most shorebirds depend on coastal habitats for much of their life cycle. The quality and diversity of feeding areas during the wintering period directly condition their winter survival, subsequent migration, and breeding success. During their wintering in France, shorebirds use intertidal areas for feeding, both in daylight and at night, depending...
Preprint
Full-text available
Background: Departure decisions in long-distance migratory bird species may depend on favourable weather conditions and beneficial resources at the destination location, overarched by genetic triggers. However, few studies have tried to validate the significance of these three concepts simultaneously, and long-term, high-resolution tagging datasets...
Article
Full-text available
Evaluations of the functioning of benthic marine food webs could be improved by quantifying organic matter fluxes from the meiofauna to higher trophic levels. In this study, we measured the simultaneous ingestion of meiofauna and macrofauna by common dwellers of a tropical intertidal mudflat on the coast of Amazonia. The meiofauna and macrofauna (t...
Article
Full-text available
Microphytobenthos (MPB) from intertidal mud- flats are key primary producers at the land–ocean interface. MPB can be more productive than phytoplankton and sus- tain both benthic and pelagic higher trophic levels. The ob- jective of this study is to assess the contribution of light, mud temperature, and gastropod Peringia ulvae grazing pres- sure i...
Preprint
Full-text available
Microphytobenthos (MPB) from intertidal mudflats are key primary producers at the land-ocean interface. MPB can be more productive than phytoplankton and sustain both benthic and pelagic higher trophic levels. The objective of this study is to assess the contribution of light, mud temperature, and gastropod Peringia ulvae grazing pressure in shapin...
Article
Western France is at the crossroads of the migratory routes of two subspecies of black-tailed godwit, Limosa limosa. After leaving Iceland, the godwit L.l. islandica Icelandic black-tailed godwit (IBTG) winters on the coast of western Europe, while the continental black-tailed godwit (CBTG) L.l. limosa can stop in France when migrating between Iber...
Article
Full-text available
Given the lack of background data on essential and non-essential trace elements in invertebrates and fish known to be the predominant prey of marine mammals and seabirds breeding at the Kerguelen Islands, this study intends to provide these results of great influence for predators in higher trophic levels. To this end, plankton organisms (9 species...
Article
Full-text available
article: le programme de recherche et de conservation Limitrack vise à Mieux comprendre l utilisation spatiale et temporelle des aires fonctionnelles de cinq des principales espèces de limicoles des Pertuis charentais afin de mettre en place une gestion adaptée de habitats dont elles dépendent. Les trois espèces suivies actuellement sont le courlis...
Article
Full-text available
The Numeniini is a tribe of 13 wader species (Scolopacidae, Charadriiformes) of which seven are Near Threatened or globally threatened, including two Critically Endangered. To help inform conservation management and policy responses, we present the results of an expert assessment of the threats that members of this taxonomic group face across migra...
Article
The extreme dynamics of the Amazonian coast and associated mudbanks raises questions about their unknown resistant infauna. In order to fill the gap, we investigated the seasonal variations of species composition, abundance and population structure of Tanaidacea in two dynamic mudbanks near the coast of French Guiana. Despite the low species richne...
Article
Full-text available
Background Long-term benthic monitoring is rewarding in terms of science, but labour-intensive, whether in the field, the laboratory, or behind the computer. Building and managing databases require multiple skills, including consistency over time as well as organisation via a systematic approach. Here, we introduce and share our spatially explicit...
Data
R code for correcting ouliers and NA values in the dataframe
Data
R code for creating results presented in the data paper
Article
In tropical South America, the mudflats of the Amazonian coast are unique because of their large size and unrivaled migration dynamics. On Guiana’s coast, macrofaunal communities are believed to be well-adapted to these dynamic conditions. In this study, the benthic macrofauna was sampled in April 2012 in the Awala-Yalimapo region of western French...
Article
Migratory connectivity can be defined as the flux of individuals or populations among areas between stages of an animal's life cycle. Many shorebird species perform long-distance migrations and while moving between breeding and wintering grounds, they depend on a network of intermediate wetlands (stopover sites) where populations of different origi...
Article
The North Atlantic coast of South America is influenced by the Amazon River. This coast is considered the muddiest in the world due to the enormous suspended sediment input from the Amazon River. The mobility of the sediment imposes a geomorphological dynamic with a rapid change of shoreline and fast alternation of facies types of the sediment. Thi...
Article
Full-text available
A new species, Monokalliapseudes guianae, is described from French Guianese estuaries. It is distinguishable from its only congener most notably by lacking an exopodite on pereopod 1 and by the nature of the basal article of the uropod. The inner distal corner of the basal article is only slightly produced and lacks a rounded lobe. The bases of per...
Article
The coasts of France are known as wintering and staging areas for Dunlin, but the function and importance of the sites at which they are found remains unclear, especially during migration. This study updates information on the numbers and the distribution of Dunlin in France using International Waterbird Census data (counts in January 1977–2013, or...
Article
Full-text available
In this study, we describe food availability and diet selection of the Red Knot Calidris canutus islandica wintering in three estuarine bays on the French Channel coast. We examined whether the distribution of birds is related to the density and availability of high quality prey. Results indicate strong seasonal and inter-annual variation in the ab...
Technical Report
Full-text available
RAPPORT FINAL DANS LE CADRE DE LA CONVENTION POUR L’ETUDE SUR L’IMPORTANCE DES PERTUIS CHARENTAIS ET DE LEURS ESPACES PROTEGES DANS L’ACCUEIL ET LA PRESERVATION DES OISEAUX LIMICOLES. Ce projet s’articule en trois volets qui permettront de répondre au mieux aux objectifs globaux fixés qui sont : 1- Description des habitats intertidaux de l’ensembl...
Article
Full-text available
The migratory shorebirds of the East Atlantic flyway land in huge numbers during a migratory stopover or wintering on the French Atlantic coast. The Brouage bare mudflat (Marennes-Oléron Bay, NE Atlantic) is one of the major stopover sites in France. The particular structure and function of a food web affects the efficiency of carbon transfer. The...
Article
Full-text available
The migratory shorebirds of the East Atlantic flyway land in huge numbers during a migratory stopover or wintering on the French Atlantic coast. The Brouage bare mudflat (Marennes-Oléron Bay, NE Atlantic) is one of the major stopover sites in France. The particular structure and function of a food web affects the efficiency of carbon transfer. The...
Article
Species with known long-term changes in abundance and distribution enable exploring the role of newly accessible sites in population regulation. In Western Europe, the Black-tailed Godwit Limosa limosa islandica is one of the few wintering shorebirds with increasing populations. The French coasts comprise a major wintering site within its global wi...
Article
Coastal shorebird species overlap at many wintering sites or migratory stopovers. However, each species is morphologically and physiologically specialised for reducing competition for space, time or habitat. A species can encompass several populations, sometimes designated as subspecies. Differences between populations, ages and sexes within the sa...
Article
Full-text available
In expanding populations, individuals may increasingly be forced to use sites of relatively low quality. This process, named the "buffer effect," was previously described for the Black-tailed Godwit (Limosa limosa islandica) in its use of nonbreeding sites in Great Britain and of breeding areas in Iceland. On the basis of diet analyses from droppin...
Article
This study investigated sub-lethal effects and detoxification processes activated in free-ranging Red Knots (RKs) (Calidris canutus) from the Pertuis Charentais on the Atlantic coast of France, and compared the results with previous data obtained on another shorebird species, the Black-tailed Godwit (Limosa limosa). The concentrations of 13 trace e...
Conference Paper
Intertidal mudflats in bays and estuaries are among the most productive ecosystems and present a very high biodiversity (Valiela 1995). The high productivity is tied to the development of microphytobenthic biofilms at mud surface (MacIntyre et al. 1996) as this organic material supplies food webs. Moreover, mudflats are areas of international impor...
Presentation
Hunting moratorium on Eurasian Curlew Numenius arquata in France (2008-2012) : possible effects at different spatial levels. Nature reseve of Moeze-Oléron
Conference Paper
Background/Question/Methods The migratory shorebirds of the East Atlantic flyway massively land for migratory stopover or wintering on the French Atlantic coast. The Brouage bare mudflat is one of the major stopover sites in France. The activity of Brouage mudflat at low tide is based on the development of a microalgal biofilm which feeds the ben...
Article
Trace element concentrations (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Zn) were investigated in the liver, kidneys, muscle and feathers of 31 black-tailed godwits (Limosa limosa) accidentally killed during catches by mist net in the Pertuis Charentais, Atlantic coast of France. Analyses of carbon and nitrogen stable isotope ratios were carri...
Article
This study investigated sub-lethal effects and detoxification processes activated in free-ranging Red Knots (RKs) (Calidris canutus) from the Pertuis Charentais on the Atlantic coast of France, and compared the results with previous data obtained on another shorebird species, the Black-tailed Godwit (Limosa limosa). The concentrations of 13 trace e...
Article
Wader Study Group Bulletin 119 (2012): 17-25 The two subspecies of the Red Knot Calidris canutus that occur in Europe during northward and southward migration, islandica and canutus, are only observed simultaneously at a few sites such as the Wadden Sea. Mostly islandica winters on estuarine bays in NW Europe, while canutus go to wintering grounds...
Article
In western Europe, the coasts of Vendée and Charente-Maritime on the central Atlantic shoreline of France constitute the most southern wintering site for the Red Knot Calidris canutus islandica, welcoming around 37,000 individuals each winter, and also represent a key stopover area for C. c. canutus (up to 60,000 individuals) between Africa and the...
Article
Full-text available
Local studies have shown that the distribution of red knots Calidris canutus across intertidal mudflats is consistent with the predictions of an ideal distribution, but not a free distribution. Here, we scale up the study of feeding distributions to their entire wintering area in western Europe. Densities of red knots were compared among seven wint...
Article
Full-text available
Common Shelduck Tadorna tadorna were studied in western France, at two wintering sites of international importance for this species. The numbers, densities, feeding activity, feeding methods and diet of Shelduck feeding in the soft sediments of Aiguillon Bay and Marennes-Oléron Bay, on the Charente-Maritime and South Vendée coast, were examined. Th...
Article
Full-text available
Numerous animals move vast distances through media with stochastic dynamic properties. Avian migrants must cope with variable wind speeds and directions en route, which potentially jeopardize fine-tuned migration routes and itineraries. We show how unpredictable winds affect flight times and the use of an intermediate staging site by red knots (Cal...