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Article ; Online: Albatrosses can memorize locations of predictable fishing boats but favour natural foraging.

Collet, Julien / Weimerskirch, Henri

2020 Volume 287, Issue 1932, Page(s) 20200958

Abstract: Human activities generate food attracting many animals worldwide, causing major conservation issues. The spatio-temporal predictability of anthropogenic resources could reduce search costs for animals and mediate their attractiveness. We investigated ... ...

Abstract	Human activities generate food attracting many animals worldwide, causing major conservation issues. The spatio-temporal predictability of anthropogenic resources could reduce search costs for animals and mediate their attractiveness. We investigated this through GPS tracking in breeding black-browed albatrosses attracted to fishing boats. We tested for answers to the following questions. (i) Can future boat locations be anticipated from cues available to birds? (ii) Are birds able to appropriately use these cues to increase encounters? (iii) How frequently do birds use these cues? Boats were spatially persistent: birds searching in the direction where they previously attended boats would encounter twice as many boats compared with following a random direction strategy. A large proportion of birds did not use this cue: across pairs of consecutive trips (
MeSH term(s)	Animals ; Birds/physiology ; Feeding Behavior/physiology ; Fisheries ; Human Activities ; Ships
Language	English
Publishing date	2020-08-05
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	209242-6
ISSN	1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193
ISSN (online)	1471-2954
ISSN	0080-4649 ; 0962-8452 ; 0950-1193
DOI	10.1098/rspb.2020.0958
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Article ; Online: Albatrosses develop attraction to fishing vessels during immaturity but avoid them at old age.

Weimerskirch, Henri / Corbeau, Alexandre / Pajot, Adrien / Patrick, Samantha C / Collet, Julien

Proceedings. Biological sciences

2023 Volume 290, Issue 1990, Page(s) 20222252

Abstract: Animals have to develop novel behaviours to adapt to anthropogenic activities or environmental changes. Fishing vessels constitute a recent feature that attracts albatrosses in large numbers. While they provide a valuable food source through offal and ... ...

Abstract	Animals have to develop novel behaviours to adapt to anthropogenic activities or environmental changes. Fishing vessels constitute a recent feature that attracts albatrosses in large numbers. While they provide a valuable food source through offal and bait, they cause mortalities through bycatch, such that selection on vessel attraction will depend on the cost-benefit balance. We examine whether attraction to fishing and other vessels changes through the lifetime of great albatrosses, and show that attraction differed between age classes, sexes and personality. Juveniles encountered fewer vessels than adults, but also showed a lower attraction to vessels when encountered. Attraction rates, especially for fishing vessels, increased through immaturity to peak during adulthood, decreasing with old age. Shy females had lower attraction to vessels and shy males remained at vessels longer, suggesting that bolder individuals may outcompete shyer ones, with positive consequences for mass gain. These results suggest that attraction to vessels is a learned process, leading to an increase with age, and is not the result of preferential attraction to new objects by juveniles. Overall, our findings have important conservation implications as a result of potential strong differential selection on the risk of bycatch for age classes, personality types, populations and species.
MeSH term(s)	Animals ; Hunting ; Fisheries ; Birds
Language	English
Publishing date	2023-01-04
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	209242-6
ISSN	1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193
ISSN (online)	1471-2954
ISSN	0080-4649 ; 0962-8452 ; 0950-1193
DOI	10.1098/rspb.2022.2252
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Article ; Online: Mechanisms of collective learning: how can animal groups improve collective performance when repeating a task?

Collet, Julien / Morford, Joe / Lewin, Patrick / Bonnet-Lebrun, Anne-Sophie / Sasaki, Takao / Biro, Dora

Philosophical transactions of the Royal Society of London. Series B, Biological sciences

2023 Volume 378, Issue 1874, Page(s) 20220060

Abstract: Learning is ubiquitous in animals: individuals can use their experience to fine-tune behaviour and thus to better adapt to the environment during their lifetime. Observations have accumulated that, at the collective level, groups can also use their ... ...

Abstract	Learning is ubiquitous in animals: individuals can use their experience to fine-tune behaviour and thus to better adapt to the environment during their lifetime. Observations have accumulated that, at the collective level, groups can also use their experience to improve collective performance. Yet, despite apparent simplicity, the links between individual learning capacities and a collective's performance can be extremely complex. Here we propose a centralized and broadly applicable framework to begin classifying this complexity. Focusing principally on groups with stable composition, we first identify three distinct ways through which groups can improve their collective performance when repeating a task: each member learning to better solve the task on its own, members learning about each other to better respond to one another and members learning to improve their complementarity. We show through selected empirical examples, simulations and theoretical treatments that these three categories identify distinct mechanisms with distinct consequences and predictions. These mechanisms extend well beyond current social learning and collective decision-making theories in explaining collective learning. Finally, our approach, definitions and categories help generate new empirical and theoretical research avenues, including charting the expected distribution of collective learning capacities across taxa and its links to social stability and evolution. This article is part of a discussion meeting issue 'Collective behaviour through time'.
MeSH term(s)	Animals ; Social Behavior ; Behavior, Animal ; Decision Making ; Learning ; Social Group
Language	English
Publishing date	2023-02-20
Publishing country	England
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ZDB-ID	208382-6
ISSN	1471-2970 ; 0080-4622 ; 0264-3839 ; 0962-8436
ISSN (online)	1471-2970
ISSN	0080-4622 ; 0264-3839 ; 0962-8436
DOI	10.1098/rstb.2022.0060
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Article ; Online: Pigeons retain partial memories of homing paths years after learning them individually, collectively or culturally.

Collet, Julien / Sasaki, Takao / Biro, Dora

Proceedings. Biological sciences

2021 Volume 288, Issue 1963, Page(s) 20212110

Abstract: Memory of past experience is central to many animal decisions, but how long specific memories can influence behaviour is poorly understood. Few studies have reported memories retrieved after several years in non-human animals, especially for spatial ... ...

Abstract	Memory of past experience is central to many animal decisions, but how long specific memories can influence behaviour is poorly understood. Few studies have reported memories retrieved after several years in non-human animals, especially for spatial tasks, and whether the social context during learning could affect long-term memory retention. We investigated homing pigeons' spatial memory by GPS-recording their homing paths from a site 9 km from their loft. We compared solo flights of naive pigeons with those of pigeons that had last homed from this site 3-4 years earlier, having learnt a homing route either alone (individual learning), together with a naive partner (collective learning) or within cultural transmission chains (cultural learning). We used as a control a second release site unfamiliar to all pigeons. Pigeons from all learning treatments outperformed naive birds at the familiar (but not the unfamiliar) site, but the idiosyncratic routes they formerly used several years before were now partially forgotten. Our results show that non-human animals can use their memory to solve a spatial task years after they last performed it, irrespective of the social context during learning. They also suggest that without reinforcement, landmarks and culturally acquired 'route traditions' are gradually forgotten.
MeSH term(s)	Animals ; Columbidae ; Flight, Animal ; Homing Behavior ; Orientation ; Reinforcement, Psychology ; Spatial Memory
Language	English
Publishing date	2021-11-17
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	209242-6
ISSN	1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193
ISSN (online)	1471-2954
ISSN	0080-4649 ; 0962-8452 ; 0950-1193
DOI	10.1098/rspb.2021.2110
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Article ; Online: STIM2 is involved in the regulation of apoptosis and the cell cycle in normal and malignant monocytic cells.

Djordjevic, Stefan / Itzykson, Raphaël / Hague, Frédéric / Lebon, Delphine / Legrand, Julien / Ouled-Haddou, Hakim / Jedraszak, Guillaume / Harbonnier, Juliette / Collet, Louison / Paubelle, Etienne / Marolleau, Jean-Pierre / Garçon, Loïc / Boyer, Thomas

Molecular oncology

2024

Abstract: Calcium is a ubiquitous messenger that regulates a wide range of cellular functions, but its involvement in the pathophysiology of acute myeloid leukemia (AML) is not widely investigated. Here, we identified, from an analysis of The Cancer Genome Atlas ... ...

Abstract	Calcium is a ubiquitous messenger that regulates a wide range of cellular functions, but its involvement in the pathophysiology of acute myeloid leukemia (AML) is not widely investigated. Here, we identified, from an analysis of The Cancer Genome Atlas and genotype-tissue expression databases, stromal interaction molecule 2 (STIM2) as being highly expressed in AML with monocytic differentiation and negatively correlated with overall survival. This was confirmed on a validation cohort of 407 AML patients. We then investigated the role of STIM2 in cell proliferation, differentiation, and survival in two leukemic cell lines with monocytic potential and in normal hematopoietic stem cells. STIM2 expression increased at the RNA and protein levels upon monocyte differentiation. Phenotypically, STIM2 knockdown drastically inhibited cell proliferation and induced genomic stress with DNA double-strand breaks, as shown by increased levels of phosphorylate histone H2AXγ (p-H2AXγ), followed by activation of the cellular tumor antigen p53 pathway, decreased expression of cell cycle regulators such as cyclin-dependent kinase 1 (CDK1)-cyclin B1 and M-phase inducer phosphatase 3 (CDC25c), and a decreased apoptosis threshold with a low antiapoptotic/proapoptotic protein ratio. Our study reports STIM2 as a new actor regulating genomic stability and p53 response in terms of cell cycle and apoptosis of human normal and malignant monocytic cells.
Language	English
Publishing date	2024-01-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	2415106-3
ISSN	1878-0261 ; 1574-7891
ISSN (online)	1878-0261
ISSN	1574-7891
DOI	10.1002/1878-0261.13584
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Article ; Online: How do seabirds modify their search behaviour when encountering fishing boats?

Corbeau, Alexandre / Collet, Julien / Fontenille, Melissa / Weimerskirch, Henri

PloS one

2019 Volume 14, Issue 9, Page(s) e0222615

Abstract: Seabirds are well known to be attracted by fishing boats to forage on offal and baits. We used recently developed loggers that record accurate GPS position and detect the presence of boats through their radar emissions to examine how albatrosses use Area ...

Abstract	Seabirds are well known to be attracted by fishing boats to forage on offal and baits. We used recently developed loggers that record accurate GPS position and detect the presence of boats through their radar emissions to examine how albatrosses use Area Restricted Search (ARS) and if so, have specific ARS behaviours, when attending boats. As much as 78.5% of locations with a radar detection (contact with boat) during a trip occurred within ARS: 36.8% of all large-scale ARS (n = 212) and 14.7% of all small-scale ARS (n = 1476) were associated with the presence of a boat. During small-scale ARS, birds spent more time and had greater sinuosity during boat-associated ARS compared with other ARS that we considered natural. For, small-scale ARS associated with boats, those performed over shelves were longer in duration, had greater sinuosity, and birds spent more time sitting on water compared with oceanic ARS associated with boats. We also found that the proportion of small-scale ARS tend to be more frequently nested in larger-scale ARS was higher for birds associated with boats and that ARS behaviour differed between oceanic (tuna fisheries) and shelf-edge (mainly Patagonian toothfish fisheries) habitats. We suggest that, in seabird species attracted by boats, a significant amount of ARS behaviours are associated with boats, and that it is important to be able to separate ARS behaviours associated to boats from natural searching behaviours. Our study suggest that studying ARS characteristics should help attribute specific behaviours associated to the presence of boats and understand associated risks between fisheries.
MeSH term(s)	Animals ; Appetitive Behavior ; Birds/physiology ; Female ; Fisheries ; Male ; Oceans and Seas ; Ships
Language	English
Publishing date	2019-09-24
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1932-6203
ISSN (online)	1932-6203
DOI	10.1371/journal.pone.0222615
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Neural networks reveal emergent properties of collective learning in democratic but not despotic groups

Morford, Joe / Lewin, Patrick / Biro, Dora / Guilford, Tim / Padget, Oliver / Collet, Julien

Animal behaviour. 2022 Aug. 15,

2022

Abstract: Collective learning, the improvement of behaviours through experience of collective actions, is an area of animal learning that has received little attention. We investigated how individual learning during collective actions could produce improvements in ...

Abstract	Collective learning, the improvement of behaviours through experience of collective actions, is an area of animal learning that has received little attention. We investigated how individual learning during collective actions could produce improvements in collective performance, and how collective decision-making processes, including leadership dynamics, could impact upon learning. We trained artificial neural networks, either solo or paired, at an orientation task, based upon collective navigation in animals. In pairs, we implemented two rules of collective decision making: ‘democratic’ (weighted average of individual propositions) or ‘despotic’ (one individual’s proposition, determined randomly with weighted probabilities in each trial). Decision-making weightings were varied between pairs, but fixed for a given pair, with asymmetric weightings generating ‘leaders’ and ‘followers’. We found nearly all pairs improved their orientation, but more slowly than solo learners. Within pairs, leaders learnt more quickly than followers (‘the passenger–driver effect’). In democratic pairs, collective performance improved through individuals learning to compensate for partner error. This emergent process was not observed in pairs with despotic decision making, in which individuals learnt similarly to solo learners. Our model helps to clarify the links between individual learning, collective decision making and collective performance, in the context of collective navigation, and collective behaviour, more generally.
Keywords	animal behavior ; animals ; decision making ; group behavior ; leadership
Language	English
Dates of publication	2022-0815
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ZDB-ID	281-1
ISSN	0003-3472
ISSN	0003-3472
DOI	10.1016/j.anbehav.2022.09.020
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Honeybee CaV4 has distinct permeation, inactivation, and pharmacology from homologous NaV channels.

Bertaud, Anaïs / Cens, Thierry / Chavanieu, Alain / Estaran, Sébastien / Rousset, Matthieu / Soussi, Lisa / Ménard, Claudine / Kadala, Akelsso / Collet, Claude / Dutertre, Sébastien / Bois, Patrick / Gosselin-Badaroudine, Pascal / Thibaud, Jean-Baptiste / Roussel, Julien / Vignes, Michel / Chahine, Mohamed / Charnet, Pierre

The Journal of general physiology

2024 Volume 156, Issue 5

Abstract: DSC1, a Drosophila channel with sequence similarity to the voltage-gated sodium channel (NaV), was identified over 20 years ago. This channel was suspected to function as a non-specific cation channel with the ability to facilitate the permeation of ... ...

Abstract	DSC1, a Drosophila channel with sequence similarity to the voltage-gated sodium channel (NaV), was identified over 20 years ago. This channel was suspected to function as a non-specific cation channel with the ability to facilitate the permeation of calcium ions (Ca2+). A honeybee channel homologous to DSC1 was recently cloned and shown to exhibit strict selectivity for Ca2+, while excluding sodium ions (Na+), thus defining a new family of Ca2+ channels, known as CaV4. In this study, we characterize CaV4, showing that it exhibits an unprecedented type of inactivation, which depends on both an IFM motif and on the permeating divalent cation, like NaV and CaV1 channels, respectively. CaV4 displays a specific pharmacology with an unusual response to the alkaloid veratrine. It also possesses an inactivation mechanism that uses the same structural domains as NaV but permeates Ca2+ ions instead. This distinctive feature may provide valuable insights into how voltage- and calcium-dependent modulation of voltage-gated Ca2+ and Na+ channels occur under conditions involving local changes in intracellular calcium concentrations. Our study underscores the unique profile of CaV4 and defines this channel as a novel class of voltage-gated Ca2+ channels.
MeSH term(s)	Bees ; Animals ; Calcium ; Voltage-Gated Sodium Channels/chemistry ; Ions
Chemical Substances	Calcium (SY7Q814VUP) ; Voltage-Gated Sodium Channels ; Ions
Language	English
Publishing date	2024-04-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	3118-5
ISSN	1540-7748 ; 0022-1295
ISSN (online)	1540-7748
ISSN	0022-1295
DOI	10.1085/jgp.202313509
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Article ; Online: How do seabirds modify their search behaviour when encountering fishing boats?

Alexandre Corbeau / Julien Collet / Melissa Fontenille / Henri Weimerskirch

PLoS ONE, Vol 14, Iss 9, p e

2019 Volume 0222615

Abstract	Seabirds are well known to be attracted by fishing boats to forage on offal and baits. We used recently developed loggers that record accurate GPS position and detect the presence of boats through their radar emissions to examine how albatrosses use Area Restricted Search (ARS) and if so, have specific ARS behaviours, when attending boats. As much as 78.5% of locations with a radar detection (contact with boat) during a trip occurred within ARS: 36.8% of all large-scale ARS (n = 212) and 14.7% of all small-scale ARS (n = 1476) were associated with the presence of a boat. During small-scale ARS, birds spent more time and had greater sinuosity during boat-associated ARS compared with other ARS that we considered natural. For, small-scale ARS associated with boats, those performed over shelves were longer in duration, had greater sinuosity, and birds spent more time sitting on water compared with oceanic ARS associated with boats. We also found that the proportion of small-scale ARS tend to be more frequently nested in larger-scale ARS was higher for birds associated with boats and that ARS behaviour differed between oceanic (tuna fisheries) and shelf-edge (mainly Patagonian toothfish fisheries) habitats. We suggest that, in seabird species attracted by boats, a significant amount of ARS behaviours are associated with boats, and that it is important to be able to separate ARS behaviours associated to boats from natural searching behaviours. Our study suggest that studying ARS characteristics should help attribute specific behaviours associated to the presence of boats and understand associated risks between fisheries.
Keywords	Medicine ; R ; Science ; Q
Subject code	930
Language	English
Publishing date	2019-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: PARP Inhibitors: A Major Therapeutic Option in Endocrine-Receptor Positive Breast Cancers.

Collet, Laetitia / Péron, Julien / Penault-Llorca, Frédérique / Pujol, Pascal / Lopez, Jonathan / Freyer, Gilles / You, Benoît

Cancers

2022 Volume 14, Issue 3

Abstract: Recently, OlympiAD and EMBRACA trials demonstrated the favorable efficacy/toxicity ratio of PARPi, compared to chemotherapy, in patients with HER2-negative metastatic breast cancers (mBC) carrying a germline BRCA mutation. PARPi have been largely adopted ...

Abstract	Recently, OlympiAD and EMBRACA trials demonstrated the favorable efficacy/toxicity ratio of PARPi, compared to chemotherapy, in patients with HER2-negative metastatic breast cancers (mBC) carrying a germline BRCA mutation. PARPi have been largely adopted in triple-negative metastatic breast cancer, but their place has been less clearly defined in endocrine-receptor positive, HER2 negative (ER+/ HER2-) mBC. The present narrative review aims at addressing this question by identifying the patients that are more likely benefit from PARPi. Frequencies of BRCA pathogenic variant (PV) carriers among ER+/HER2- breast cancer patients have been underestimated, and many experts assume than 50% of all BRCA1/2 mutated breast cancers are of ER+/HER2- subtype. Patients with ER+/HER2- BRCA-mutated mBC seemed to have a higher risk of early disease progression while on CDK4/6 inhibitors and PARPi are effective especially when prescribed before exposure to chemotherapy. The OLYMPIA trial also highlighted the utility of PARPi in patients with early breast cancers at high risk of relapse and carrying PV of BRCA. PARPi might also be effective in patients with HRD diseases, representing up to 20% of ER+/HER2- breast cancers. Consequently, the future implementation of early genotyping strategies for identifying the patients with high-risk ER+/HER2- HRD breast cancers likely to benefit from PARPi is of high importance.
Language	English
Publishing date	2022-01-25
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2527080-1
ISSN	2072-6694
ISSN	2072-6694
DOI	10.3390/cancers14030599
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