Effect of simulated tidal currents on the burrow emergence rhythms of the Norway lobster (Nephrops norvegicus)

Sbragaglia, Valerio; García, José A.; Chiesa, Juan José; Aguzzi, Jacopo

doi:10.1007/s00227-015-2726-5

Cited by 18 publications

(22 citation statements)

References 46 publications

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“…In particular, key research can be to date focused on issues of relevance for canyon ecology at the largest cabled observatory network on the planet, as operated by Ocean Network Canada (ONC; http://www.oceannetworks.ca/). The North East Pacific Time-Series Experiment, (NEPTUNE) network deployed in Barkley Canyon allows to studyin situ rhythmic behavior and species tolerance in response to tidal and inertial fluxes (which has important implications on adult dispersal rates; Sbragaglia et al, 2015;Chatzievangelou et al, 2016), and to multiple climate change variables including methane, pH, pCO2, pO2, salinity, temperature, turbidity, chlorophyll-a (for primary production) . Such monitoring capability can be to date increased by endowing fixed networks of cabled monitoring platforms with semi-mobile rovers, tethered to the nodes, extending the spatial coverage from few m2 to few tens of m2 (Thomsen et al, 2012;Aguzzi et al, 2015).…”

Section: Knowledge Gaps and Future Directions For Understanding Canyomentioning

confidence: 99%

Ecological Role of Submarine Canyons and Need for Canyon Conservation: A Review

et al. 2017

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Submarine canyons are major geomorphic features of continental margins around the world. Several recent multidisciplinary projects focused on the study of canyons have considerably increased our understanding of their ecological role, the goods, and services they provide to human populations, and the impacts that human activities have on their overall ecological condition. Pressures from human activities include fishing, dumping of land-based mine tailings, and oil and gas extraction. Moreover, hydrodynamic processes of canyons enhance the down-canyon transport of litter. The effects of climate change may modify the intensity of currents. This potential hydrographic change is predicted to impact the structure and functioning of canyon communities as well as affect nutrient supply to the deep-ocean ecosystem. This review not only identifies the ecological status of canyons, and current and future issues for canyon conservation, but also highlights the need for a better understanding of anthropogenic impacts on canyon ecosystems and proposes other research required to inform management measures to protect canyon ecosystems.

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Section: Knowledge Gaps and Future Directions For Understanding Canyomentioning

confidence: 99%

Ecological Role of Submarine Canyons and Need for Canyon Conservation: A Review

et al. 2017

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“…Locomotor activity creates strong visual and mechanosensory stimuli that are perceivable by predatory fish. Moreover, in the presence of water currents, Nephrops activity out of the burrow is inhibited and in their quick excursions lobsters are preferentially oriented downstream, a strategy that could increase detection of predatory fish that preferentially move upstream in water flow (Sbragaglia et al, 2015). Finally, decreased activity confers an additional advantage by saving metabolic energy (Kramer and Mclaughlin, 2001).…”

Section: Discussionmentioning

confidence: 99%

Fighting over burrows: the emergence of dominance hierarchies in the Norway lobster (Nephrops norvegicus)

Sbragaglia

Leiva

Arias

et al. 2017

Journal of Experimental Biology

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Animals fight over resources such as mating partners, territory, food or shelter and repeated contests lead to stable social hierarchies in different phyla. The group dynamics of hierarchy formation are not characterized in the Norway lobster (). Lobsters spend most of the day in burrows and forage outside of them according to a diel (i.e. 24 h-based) activity rhythm. Here, we use a linear and generalized mixed model approach to analyse, in seven groups of four male lobsters, the formation of dominance hierarchies and rank-related changes in burrowing behaviour. We show that hierarchies emerge within 1-3 days and increase in steepness over a period of 5 days, while rank changes and number of fights gradually decrease over a 5-day period. The rank position determined by open area fights predicts the outcome of fights over burrows, the time spent in burrows, and the locomotor activity levels. Dominant lobsters are more likely to evict subordinate lobsters from their burrows and are more successful in defending their own burrows. They spend more time in burrows and display lower levels of locomotor activity outside the burrow. Lobsters do not change their diel activity rhythms as a result of a change in rank, and all tested individuals showed higher activity at night and dusk compared with dawn and daytime. We discuss how behavioural changes in burrowing behaviour could lead to rank-related benefits such as reduced exposure to predators and energy savings.

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“…Deep sea lobsters use burrows as their primary defence to avoid predators, and emergence patterns of Norway lobster on the continental shelf are during periods low light to avoid visual predators [56]. However, at the depths scampi live, there is limited light and tidal cycles may be the only zeitgeber present [55].…”

Section: Discussionmentioning

confidence: 99%

Orientation and food search behaviour of a deep sea lobster in turbulent versus laminar odour plumes

Major

Jeffs

2017

Helgol Mar Res

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New Zealand scampi (Metanephrops challengeri) is a commercially important deep-water lobster species that is caught by bottom trawling on areas of muddy seafloor on the continental shelf below 300 m. Efforts are being made to develop lower impact potting methods to harvest scampi, however, they can only be caught when out of their burrows and searching for food. This emergent food searching behaviour appears to be associated with periods of higher tidal flow. Such water flow will increase turbulence along the sea floor, which has been observed to improve the efficiency of chemosensory food searching in some lobster species. Consequently, this study examined the food search behaviour of scampi in response to odours from two types of bait (mackerel and mussel) in both turbulent and laminar flows. Scampi were more efficient at foraging in the turbulent flow than in the laminar flow, using shorter search paths in response to both types of bait. Scampi in the turbulent flow reached the mussel bait 44% faster and with lower mean heading angles than in laminar flow. However, there was no difference between the flow regimes for the mackerel bait. The pattern of orientation behaviour was similar under both flow regimes, suggesting that the scampi were using the same orientation strategy, but it was more accurate in turbulent flows. The results show that the foraging efficiency of scampi improves in turbulent conditions and that this may explain their increased emergent behaviour during periods of higher tidal flows.

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Effect of simulated tidal currents on the burrow emergence rhythms of the Norway lobster (Nephrops norvegicus)

Cited by 18 publications

References 46 publications

Ecological Role of Submarine Canyons and Need for Canyon Conservation: A Review

Ecological Role of Submarine Canyons and Need for Canyon Conservation: A Review

Fighting over burrows: the emergence of dominance hierarchies in the Norway lobster (Nephrops norvegicus)

Orientation and food search behaviour of a deep sea lobster in turbulent versus laminar odour plumes

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