12 documents found, page 1 of 2
Environmental DNA reveals temporal variation in mesophotic reefs of the Humbold...
Saenz‐Agudelo, Pablo; Ramirez, Paula; Beldade, Ricardo; Campoy, Ana N.; Garmendia, Vladimir; Search, Francesca V.; Fernández, Miriam; Wieters, Evie A.Temperate mesophotic reef ecosystems (TMREs) are among the least known marine habitats. Information on their diversity and ecology is geographically and temporally scarce, especially in highly productive large upwelling ecosystems. Lack of information remains an obstacle to understanding the importance of TMREs as habitats, biodiversity reservoirs and their connections with better-studied shallow reefs. Here, w...
The chaotic history of using vinegar injections to control Acanthaster spp. pop...
Dumas, Pascal; Mills, Suzanne C.; Moutardier, Grégoire; Gereva, Sompert; Beldade, Ricardo; Ham, Jayven; Kaku, Rocky; Adjeroud, MehdiThere seems to be some confusion surrounding the recent renewed interest in the use of vinegar (and other natural acids) to fight outbreaks of the corallivorous crown-of-thorns (COTS) starfish. In a recent paper by Boström-Einarsson et al. (2018), statements were made suggesting that previous studies using vinegar did not succeed in proposing effective, operational control methods. While the notion of effective...
Anemone bleaching increases the metabolic demands of symbiont anemonefish
Norin, Tommy; Mills, Suzanne C.; Crespel, Amélie; Cortese, Daphne; Killen, Shaun S.; Beldade, RicardoIncreased ocean temperatures are causing mass bleaching of anemones and corals in the tropics worldwide. While such heat-induced loss of algal symbionts (zooxanthellae) directly affects anemones and corals physiologically, this damage may also cascade on to other animal symbionts. Metabolic rate is an integrative physiological trait shown to relate to various aspects of organismal performance, behaviour and loc...
Natural endocrine profiles of the group-living skunk anemonefish Amphiprion aka...
Mills, S. C.; O'Donnell, J. L.; Bernardi, G.; Beldade, RicardoGroup-living animals commonly display differences in behaviour, physiology and endocrine profiles between conspecifics within the group, which are tightly linked to reproduction. Teleosts exhibit a variety of social systems, where social status, as well as sex, has been linked to different androgen and oestrogen profiles. Levels of gonadal androgen and oestrogen were investigated as a function of sex and positi...
Ephemeral and Localized Outbreaks of the Coral Predator Acanthaster cf. solaris...
Adjeroud, Mehdi; Kayal, Mohsen; Peignon, Christophe; Juncker, Matthieu; Mills, Suzanne C.; Beldade, Ricardo; Dumas, PascalOutbreaks of the coral predator Acanthaster spp., the crown-of-thorns seastar (COTS), cause major coral declines across the Indo-Pacific. However, the processes surrounding the initiation and propagation of COTS outbreaks are still unclear. We observed COTS outbreak abundances on several mid-shelf and inner-barrier reefs in the southern section of the New Caledonian lagoon, a multi-location initiation event tha...
An interference visual census technique applied to cryptobenthic fish assemblages
Beldade, Ricardo; Gonçalves, Emanuel JoãoWe compare the accuracy of an interference visual census technique (IVC), in which dismantling of the habitat is performed, to traditional underwater visual census (VC) and anaesthetic census. We compare the performance of these techniques applied to a temperate cryptobenthic fish assemblage using two strategies: sampling over the whole depth extent of the rocky bottom, and stratified sampling over the main mic...
Vertical structure of very nearshore larval fish assemblages in a temperate roc...
Borges, Rita Alexandra; Beldade, Ricardo; Gonçalves, Emanuel JoãoSmall-scale vertical patterns of larval distribution were studied at a very nearshore larval Wsh assemblage, during the spring–summer period of several years, at two depth strata (surface and bottom) using sub-surface and bottom trawls. A total of 4,589 larvae (2,016 from surface samples and 2,573 from bottom samples) belonging to 62 taxa included in 22 families were collected. Most larvae belonged to coastal s...
Pelagic larval duration of 10 temperate cryptobenthic fishes
Beldade, Ricardo; Pedro, T.; Gonçalves, Emanuel JoãoThe pelagic larval duration (DPL) for 10 temperate cryptobenthic species belonging to three families: Gobiidae, Gobiesocidae and Blenniidae was investigated. Overall, the Gobiesocidae presented short DPLs varying between 11 and 18 days, the Gobiidae’s DPL ranged between 14 and 39 days, and Parablennius pilicornis (Blenniidae) had an average of 33 days (range 31–37 days). Two subtypes of settlement marks were fo...
Composition and temporal dynamics of a temperate rocky cryptobenthic fish assem...
Beldade, Ricardo; Erzini, Karim; Gonçalves, Emanuel JoãoTemporal variation in a temperate cryptobenthic ¢sh assemblage at the Arra¤bida Marine Park (Portugal) was assessed by visual surveys during 2002 and 2003. A total of 9596 ¢sh from 11 families and 30 species was recorded. There were no changes in structure or density at the assemblage level between years, whereas diversity changed signi¢cantly due to a higher number of abundant species in the second year. A sim...
Depth distribution of nearshore temperate fish larval assemblages near rocky su...
Beldade, Ricardo; Borges, Rita Alexandra; Gonçalves, Emanuel JoãoIn this study, we compare the composition, abundance and structure of a temperate fish larval assemblage at different depth intervals (0–4, 4–8 and 8–12 m) in the extreme nearshore environment. We used a plankton net attached to an underwater scooter to sample in close proximity to the rocky substrate (<50 cm). A total of 868 larvae from 27 taxa in 13 families were caught. The majority of larvae belonged to ben...