Clusters of deep-sea egg-brooding octopods associated with warm fluid discharge: An ill-fated fragment of a larger, discrete population?

Hartwell, Anne M; Voight, Janet R.; Wheat, C. G.

doi:10.1016/j.dsr.2018.03.011

Cited by 18 publications

(12 citation statements)

References 37 publications

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“…Temperature measurements with probes attached to either Jason II or Alvin were made within cracks, under pillows, in places with staining on basalt, and near the sediment‐basement contact (Figure ). The most vigorous hydrothermal fluid discharge was located in the Marker K area and at Markers A and M. The area around Marker K also had many female octopuses that were brooding their eggs (Hartwell et al, ). We used the presence of octopuses as indicators of sites of fluid discharge.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, Dorado Outcrop has the following three geomorphological features: small skylights up to tens of centimeters in diameter (Figure 2d, for example, holes described in Hartwell et al (2018), linear breaks, and carbonates. Skylights are ubiquitous around the outcrop on sheet flows and form when a section of a lava tube collapses (Peterson et al, 1994).…”

Section: 1029/2018gc007933mentioning

confidence: 99%

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Geology and Fluid Discharge at Dorado Outcrop, a Low Temperature Ridge‐Flank Hydrothermal System

Wheat

Hartwell

McManus

et al. 2019

Geochem Geophys Geosyst

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Two expeditions to Dorado Outcrop on the eastern flank of the East Pacific Rise and west of the Middle America Trench collected images, video, rocks, and sediment samples and measured temperature and fluid discharge rates to document the physical and biogeochemical characteristics of a regional, low‐temperature (~15 °C) hydrothermal system. Analysis of video and images identified lava morphologies: pillow, lobate, and sheet flows. Glasses from collected lavas were consistent with an off‐axis formation. Hydrothermal discharge generally occurs through pillow lavas but is patchy, sporadic, and sometimes ceases at particular sites of discharge. Yearlong temperature measurements at five of these discharge sites show daily ranges that oscillate with tidal frequencies by 6 °C or more. Instantaneous fluid discharge rates (0.16 to 0.19 L/s) were determined resulting in a calculated discharge of ~200 L/s when integrated over the area defined by the most robust fluid discharge. Such discharge has a power output of 10–12 MW. Hydrothermal seepage through thin sediment adjacent to the outcrop accounts for <3% of this discharge, but seepage may support an oxic sediment column. High extractable Mn concentrations and depleted δ13C in the low but variable organic solid phase suggest that hydrothermal fluids provide a source for manganese accumulation and likely enhance the oxidation of organic carbon. Comparisons of the physical and geochemical characteristics at Dorado and Baby Bare Outcrops, the latter being the only other site of ridge‐flank hydrothermal discharge that has been sampled directly, suggest commonalities and differences that have implications for future discoveries.

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Section: Resultsmentioning

confidence: 99%

Section: 1029/2018gc007933mentioning

confidence: 99%

Geology and Fluid Discharge at Dorado Outcrop, a Low Temperature Ridge‐Flank Hydrothermal System

Wheat

Hartwell

McManus

et al. 2019

Geochem Geophys Geosyst

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“…sponge and rock bottoms). Aggregations of brooding females were observed for Muusoctopus and Graneledone species in the North Pacific [72] and on a rocky outcrop off Costa Rica in the Central Pacific Ocean [73].…”

Section: Discussionmentioning

confidence: 99%

Life histories of Antarctic incirrate octopods (Cephalopoda: Octopoda)

et al. 2019

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As a general trend in the life history of marine organisms, species inhabiting cold waters have reduced growth rates and increased lifespans. Studies based on egg sizes and brooding times of deep-sea and polar octopods support this hypothesis, but empirical data on growth are still scarce. To test the hypothesis that octopods inhabiting cold waters (< 3°C) live longer than temperate and warm water species, this study investigated size-at-age, maturation and growth rates in incirrate Antarctic octopods. Octopod age was estimated via the interpretation and quantification of beak growth increments, which in shallow water octopods have been validated to be formed on a daily basis. Specimens from the families Megaleledonidae ( Adelieledone spp., Pareledone spp. and Megaleledone setebos ) and Enteroctopodidae ( Muusoctopus rigbyae ) were collected on the shelf and slope regions off the Antarctic Peninsula during a cruise in 2012. Examined specimens included early juveniles to animals in advanced maturity. The total number of growth increments ranged from 192–599 in Pareledone aequipapillae (body mass [BM] 2–109 g), 182–431 in Pareledone charcoti (BM 5–124 g), 98–906 in M . setebos (BM 10–6000 g) and 207–425 in M . rigbyae (BM 24–256 g). After the cruise, eleven specimens of P . charcoti were kept alive in captivity for more than 12 months and these animals had 219–364 growth increments, suggesting that increment formation in this species takes longer than one day. The complex population structure (size, age and maturity range) of the specimens that were captured during a relatively short time, the number of beak increments quantified, and the preliminary validation observations indicate that Antarctic octopods do not deposit increments daily, and may have lifespans exceeding 3 years. These findings corroborate the general trend that cold water molluscs have a longer lifespan than their warm water relatives.

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“…Vast microbial and faunal community structure, abundance, biodiversity, level of endemism and adaptation towards extreme condition in hadal species [504]; [505]. [227]; [238]; [284]; [336]; [694]; [736]. The existence of the organisms at such depths strongly depends on the turbulence of the streams and motion of the submarine currents.…”

Section: Izu-bonin Trenchmentioning

confidence: 99%

Deep-Sea Trenches of the Pacific Ocean: A Comparative Analysis of the Submarine Geomorphology Using Data Modeling by Gmt, Python and R

Lemenkova

2021

SSRN Journal

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Clusters of deep-sea egg-brooding octopods associated with warm fluid discharge: An ill-fated fragment of a larger, discrete population?

Cited by 18 publications

References 37 publications

Geology and Fluid Discharge at Dorado Outcrop, a Low Temperature Ridge‐Flank Hydrothermal System

Geology and Fluid Discharge at Dorado Outcrop, a Low Temperature Ridge‐Flank Hydrothermal System

Life histories of Antarctic incirrate octopods (Cephalopoda: Octopoda)

Deep-Sea Trenches of the Pacific Ocean: A Comparative Analysis of the Submarine Geomorphology Using Data Modeling by Gmt, Python and R

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