Rhythms of feeding activity and food consumption of two Mediterranean burrowing fishes: <i>Gnathophis mystax</i> (Delaroche) and <i>Chlopsis bicolor</i> Rafinesque

Carpentieri, Paolo; Colloca, Francesco; Ardizzone, Giandomenico

doi:10.1111/j.1439-0485.2007.00189.x

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…Although no recognized major predator of Nephrops has yet been identified from stomach content analysis in several fish species in the Mediterranean (reviewed by Aguzzi & Sardà 2008), other decapods are preyed upon by some benthic fish. However, the fish abundance variations are still poorly characterized in deep‐water continental margin areas (Carpentieri et al. 2007)…”

Section: Discussionmentioning

confidence: 99%

The influence of light availability and predatory behavior of the decapod crustacean Nephrops norvegicus on the activity rhythms of continental margin prey decapods

2009

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Temporal variations in assemblages of decapod crustaceans in seabed areas of continental margins depend on a complex and poorly understood interplay of physical and biological factors. In deep-water areas, decapods still show complex regulation of their swimming and walking activity rhythms in response to the day-night cycle and seasonal variations in the length of the photoperiod (reviewed by Naylor 2005; Aguzzi et al. 2008b, c). This occurs for the response of species' biological clocks to light intensity cycles (Naylor 2005). Accordingly, thousands of individuals move synchronously through different depth strata at different times (reviewed in Lagardère either burrowers that dig tunnels or, alternatively, buriers that simply cover themselves with sediment (Bellwood 2002). AbstractThe day-night cycle is one of the strongest geophysical cycles modulating species' behavioral rhythms. However, in deep-water continental margins, where light intensity decreases over depth, interspecific competition may alter behavioral responses to day-night cycles. The burrowing decapod crustacean Nephrops norvegicus is a large-size predator in benthic communities, exerting despotic territorial behavior. In this study, we analysed how the effect of light intensity cycles on decapod behavioral rhythms is reduced as one moves from shelves to slopes. In the Western Mediterranean, the predatory behavior and interspecific competition for substrate use of Nephrops increases moving from the shelf (100-110 m) to the slope (400-430 m). Vector fitting and generalized additive models were used to assess the effect of light intensity and behavioral rhythms of N. norvegicus on the temporal variation of prey decapods co-occurring in trawl tow catches carried out on the shelf and the slope during October 1999 and June 2000. The combination of diel variations in light intensity and N. norvegicus abundance influences the activity rhythms of prey decapods in a depth-and seasonal-dependent manner. Light modulation is stronger on the shelf and weaker on the slope, where Nephrops population size is greater. Although present regression analysis does not necessarily imply a direct causeeffect relationship between rhythms of predators and prey, we suggest that Nephrops alters the temporal patterning in the behavior of its prey on the slope, where light intensity is reduced. This alteration is stronger in endobenthic species than in benthopelagic species; the former rely on bottom substrate for the expression of behavioral rhythms, experiencing stronger interspecific competitions with Nephrops at time of activity.

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Section: Discussionmentioning

confidence: 99%

The influence of light availability and predatory behavior of the decapod crustacean Nephrops norvegicus on the activity rhythms of continental margin prey decapods

2009

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“…Gnathophis mystax (Delaroche, 1809) is restricted to the eastern Atlantic Ocean, where it is distributed from southern Portugal, the Canary Islands (Bauchot, 1987) and the Azores (Menezes et al ., 2006) to Morocco (Bauchot, 1987). This species also occurs in the Mediterranean Sea (Carpentieri et al ., 2007), including the Gulf of Cadiz (Torres et al ., 2012), Ionian Sea (Granata et al ., 2012), the Hellenic Seas (Papaconstantinou, 1988) and Tyrrhenian Sea (Busalacchi et al ., 2010). It inhabits a depth range of 75–800 m.…”

Section: Introductionmentioning

confidence: 99%

A new look on the morphometric characteristics of Congridae leptocephali from the southern Adriatic Sea

et al. 2021

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Anguillid leptocephali of three Congridae species (Conger conger, Ariosoma balearicum and Gnathophis mistax) were caught as bycatch of pelagic trawls during acoustic surveys targeting small pelagic fish species in the southern Adriatic Sea, carried out under the framework of the Italian MEDIAS project (western side) and its extension in the ambit of the FAO AdriaMed project (eastern side). Results refer to the findings of Congridae leptocephali during surveys conducted in 2011, 2014, 2015 and 2016. A total of 25 specimens were caught and analysed (morphological features and pigmentation patterns). Leptocephali of Conger conger were found in the range of 8.4–13.1 cm total length (TL) (between 50 and 132 m depth), Ariosoma balearicum from 9.7–12.2 cm TL (between 50 and 128 m depth) and for Gnathophis mystax in the range from 6.4–11.7 cm TL (between 40 and 79 m depth). The results indicate that the southern Adriatic Pit could be the spawning area of these species in the Adriatic Sea. Present data represent a contribution to existing knowledge about the ecology of leptocephali from the Congridae family in the southern Adriatic Sea, and also indicate the existence of differences in morphometric parameters between different areas, that is, the possibility of the existence of new geographic lines within the genus Ariosoma in the Adriatic Sea.

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Will the High Biodiversity of Eels in the Coral Triangle be Affected by Climate Change?

Miller

Wouthuyzen

Aoyama

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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The Indonesian Seas are at the center of the Coral Triangle, which has the highest marine biodiversity in the world, and the region is under threat from climate change. Freshwater habitats in the region have a high number of anguillid eels compared to other regions of the world, but it is more difficult to capture marine eels to assess their biodiversity. Catches of leptocephali from 5 internationally collaborative surveys for eel larvae (leptocephali) in the Coral Triangle have collected about 126-169 species of larvae, which indicates that the Coral Triangle region likely has the highest marine eel biodiversity in the world based on comparisons to similar larval surveys in the Indian, Pacific, and Atlantic oceans (29-107 species). These marine eel species inhabit a wide range of benthic and pelagic habitats, but how they might be affected by climate changes such as ocean warming has not been considered. Anguillid eels in the Coral Triangle region could be affected mainly by changes in rainfall patterns that could affect their freshwater growth stage or their reproductive maturation patterns and migration. Effects on marine eels would depend on the types of habitats where they live, with the least impacts occurring for deep benthic or pelagic species. Marine eels that live in shallow habitats would be most affected if warming seas and coral bleaching reduce the types of prey species they depend on. Based on their possible association with coral reef habitats, eels of the families Muraenidae and Chlopsidae appear to the most likely types of eels to be impacted by changes in community structure resulting from coral bleaching. All leptocephali species live in the ocean surface layer where they feed on marine snow, so warmer ocean temperatures might reduce the amount or quality of marine snow that is available, resulting in lower larval survival rates. Further studies on eel biodiversity and habitat use will provide more insight into the possible loss of endemic species in the Coral Triangle due to climate change, but presently it is unclear how many species of eels may be directly affected by climate change.

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Rhythms of feeding activity and food consumption of two Mediterranean burrowing fishes: Gnathophis mystax (Delaroche) and Chlopsis bicolor Rafinesque

Cited by 4 publications

References 38 publications

The influence of light availability and predatory behavior of the decapod crustacean Nephrops norvegicus on the activity rhythms of continental margin prey decapods

The influence of light availability and predatory behavior of the decapod crustacean Nephrops norvegicus on the activity rhythms of continental margin prey decapods

A new look on the morphometric characteristics of Congridae leptocephali from the southern Adriatic Sea

Will the High Biodiversity of Eels in the Coral Triangle be Affected by Climate Change?

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