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The cleaner's mimic Aspidontus taeniatus utilizes the effect of aggressive mimicry only when it is small, Misaki Fujisawa [et al.]

The cleaner's mimic Aspidontus taeniatus utilizes the effect of aggressive mimicry only when it is small, Misaki Fujisawa [et al.]

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The pair bonding in swimming goby,

Ptereleotris hanae and the association

between P. hanae and coinhabitant two

species, nest-digging shrimp and its sentinel

goby

Izumi Akagawa ∗ 1 , Mizuki Kimura 2 , Shoko Suzuki 3 , Soichiro

Matsumoto 4 , Kazuhiro Ogawa 5

1



Izumi AKAGAWA – 106, Miyatake 2-19-1, Suruga-ku, Shioka city, Shizuoka 422-8035, Japan

2

Mizuki KIMURA – Chiba, Japan

3

Shoko SUZUKI – Aichi, Japan

4

Soichiro MATSUMOTO – Tokyo, Japan

5

Kazuhiro OGAWA – Chiba, Japan



The examples of an evolutionary process of behavioral and mutualistic symbiotic associations

between gobies and shrimps in various stages have been studied. But the associations among

coinhabiting three species have not known well. Ptereleotris hanae is a goby with elongated tail

fin rays inhabiting reef edge in Indo-Pacific Ocean. Pairs of this species are often observed to

coinhabit with nest-digging shrimp, Alpheus bellulus and another goby Amblyeleotris japonica.

We observed 30 pairs in the reproductive season in 2012, 30 pairs in 2013, and 20 pairs in

2014 in Tachibanaura, Kochi pref. Japan where almost all adults were observed to inhabit the

burrows in pairs that the shrimp digs and one or a pair of A. japonica always inhabit. Individual

recognition of P. hanae was conducted by the length and position of the tail fin rays. Pairs of

P. hanae were consisted with a female and a male which was significantly larger, spawning 2-3

times in a reproductive season. The paired individuals often nuzzled each other to maintain pair

bond. Most pairs continued over one reproductive season and 30 percent pairs over two years.

We investigated the frequency of carrying sand for maintenance of the nest by shrimp in case

with and without P. hanae. We also recorded the order of three coinhabiting species coming

out of the burrow after all hiding by threatening experimentally. The first one appeared from

the nest might be a sentinel of the others. Then we investigated the negative effect of P. hanae

on A. japonica. The underwater observations proved the interferences by A. japonica against

P. hanae which tried to enter the nest. We discuss P. hanae works as a sentinel or a parasite

for the other coinhabitant species.







Speaker



216



C3/ Fish trophic chains in the

Indo-Pacific



217



A new method for inferring diet of coral reef

fish by determining mineralized elements in

situ within digestive contents using X-Ray

microtomography

Jeremie Viviani 1,2 , Amaăel Dupaix 1 , Jean Bienvenu 1 , Aurel Jennan 1 ,

David Lecchini 2 , Ren´e Galzin 2 , Laurent Viriot† 1

1



Institut de G´enomique fonctionnelle de lyon (IGFL) – CNRS : UMR5242, Institut national de la

´

recherche agronomique (INRA) : UA1288, Universit´e Claude Bernard - Lyon I (UCBL), Ecole

Normale

Sup´erieure (ENS) - Lyon – ENS de Lyon - CNRS UMR 5242 - INRA USC 1370 46, all´ee d’Italie 69364

Lyon cedex 07, France

2

Centre de recherches insulaires et observatoire de l’environnement (CRIOBE) – Universit´e de

Perpignan Via Domitia, Ecole Pratique des Hautes Etudes, Centre National de la Recherche

Scientifique : USR3278 – BP 1013 Papetoiai 98729 PAPETOAI, France



Deciphering trophic relationships between organisms has a pivotal role for further implementation of management programs based on ecology. Direct observation of digestive content and

isotopic composition of muscle samples are two classical yet complementary approaches since

digestive content provides data on the few last meals while isotope analyses cover longer periods

of time. Here we propose a new method to investigate digestive content.

We collected fish in the Society Archipelago. Digestive contents of collected specimens were dehydrated in a desiccator, and then scanned using X-Ray conventional microtomography. Some

specimens were scanned in ethanol. Dedicated software allowed reconstructing images of jaws

and dentitions in 3D with the possibility to generate surface, volume or virtual sliced renderings.

We investigated species with various feeding behaviors to see advantages or limitations of our

method in different types of diet. Even if this method is not ideally designed for strictly herbivorous species, investigating digestive content using X-ray microtomography revealed to be a

perfectly adapted method to study diet of planktonivores and zoophageous fish. This method

can be coupled with other methods of diet investigations such as metagenomics analysis.









Speaker

Corresponding author: laurent.viriot@ens-lyon.fr



218



A reconstruction of coral reef food webs in

Moorea: fish gut content metabarcoding as

a tool to disentangle trophic interactions

Jordan Casey



∗ 1



, Christopher Meyer 1 , Serge Planes 2 , Fabien Morat 3 ,

Rene Galzin 4 , Valeriano Parravicini 2



1



4



National Museum of Natural History, Smithsonian Institution (NMNH) – Washington DC, United

States

2

Centre de Recherches Insulaires et Observatoire de l’Environnement (CRIOBE) – Universit´e de

Perpignan – Perpignan, France

3

Centre de Recherches Insulaires et Observatoire de l’Environnement (CRIOBE) – Universit´e de

Perpignan – Perpignan, France

Centre de Recherches Insulaires et Observatoire de l’Environnement (CRIOBE) – Ecole Pratique des

Hautes Etudes – Paris, France



Coral reefs harbor the highest levels of diversity in the ocean, but anthropogenic stressors

such as climate change are leading to unprecedented biodiversity losses. In order to understand

the effects of such losses, it is essential to disentangle species’ functional roles on coral reefs.

Yet, we have a paucity of information on trophic relationships among species on coral reefs,

and in particular, Indo-Pacific food webs have been over-simplified and poorly studied. One

way to examine trophic interactions among species is to conduct dietary analyses. However, the

most commonly employed techniques to examine diet, gut content analysis and stable isotope

analysis, do not provide adequately high taxonomic resolution to assign species-specific trophic

pathways in complex food webs such as coral reefs. Recent advances in molecular techniques

have made metabarcoding, the mass amplification of DNA barcodes from samples containing a

multitude of eukaryotes, an accessible and invaluable tool. Further, Moorea provides a unique

opportunity for fish diet analysis due to the existence of an extensive DNA-barcode library

(Moorea BIOCODE barcode library), which contains barcodes of the vast majority of marine

organisms around Moorea. In the present project, we employed fish gut content metabarcoding

with next-generation sequencing on fishes collected around Moorea, French Polynesia across a

wide array of trophic guilds, including species from the families Pomacentridae, Chaetodontidae, Labridae, Balistidae, Gobiidae, Holocentridae, Apogonidae, and Pempheridae. With this

technique, we have pinpointed detailed, species-level trophic assignments that considerably supersede traditional, broad-scale trophic assignments (e.g. herbivores, corallivores, invertivores,

etc) and demonstrate the efficacy of utilizing metabarcoding for food web reconstruction. Our

data further reveals fine-scale trophic partitioning among species that are commonly considered

to occupy synonymous trophic groups, which underlines the importance of qualifying fish trophic

level beyond broad trophic categories.







Speaker



219



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