Podding Behavior of Adult King Crab and Its Effect on Abundance-Estimate Precision

Dew, C. Braxton

doi:10.4027/bmecpcc.2010.24

Cited by 3 publications

(4 citation statements)

References 26 publications

(34 reference statements)

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“…Aggregations of small crabs, presumably small individuals of grooved tanner crab, were observed in several occasions on small elevations of the seabed or on a short hydrate mound (Supplementary Figure 3; Supplementary Video 11). Further studies are needed to understand this behavior, with small decapods previously observed climbing on seabed structures to escape the anoxic first few cm of the BBL (Doya et al, 2016), and generally aggregating as a defense mechanism (Dew, 2010). Doya et al (2017) reported an agonistic interaction between a grooved tanner crab and a scarlet king crab over a piece of food.…”

Section: Crabsmentioning

confidence: 99%

Transects in the deep: Opportunities with tele-operated resident seafloor robots

et al. 2022

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Scientific, industrial and societal needs call urgently for the development and establishment of intelligent, cost-effective and ecologically sustainable monitoring protocols and robotic platforms for the continuous exploration of marine ecosystems. Internet Operated Vehicles (IOVs) such as crawlers, provide a versatile alternative to conventional observing and sampling tools, being tele-operated, (semi-) permanent mobile platforms capable of operating on the deep and coastal seafloor. Here we present outstanding observations made by the crawler “Wally” in the last decade at the Barkley Canyon (BC, Canada, NE Pacific) methane hydrates site, as a part of the NEPTUNE cabled observatory. The crawler followed the evolution of microhabitats formed on and around biotic and/or abiotic structural features of the site (e.g., a field of egg towers of buccinid snails, and a colonized boulder). Furthermore, episodic events of fresh biomass input were observed (i.e., the mass transport of large gelatinous particles, the scavenging of a dead jellyfish and the arrival of macroalgae from shallower depths). Moreover, we report numerous faunal behaviors (i.e., sablefish rheo- and phototaxis, the behavioral reactions and swimming or resting patterns of further fish species, encounters with octopuses and various crab intra- and interspecific interactions). We report on the observed animal reactions to both natural and artificial stimuli (i.e., crawler’s movement and crawler light systems). These diverse observations showcase different capabilities of the crawler as a modern robotic monitoring platform for marine science and offshore industry. Its long deployments and mobility enable its efficiency in combining the repeatability of long-term studies with the versatility to opportunistically observe rarely seen incidents when they occur, as highlighted here. Finally, we critically assess the empirically recorded ecological footprint and the potential impacts of crawler operations on the benthic ecosystem of the Barkley Canyon hydrates site, together with potential solutions to mitigate them into the future.

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Section: Crabsmentioning

confidence: 99%

Transects in the deep: Opportunities with tele-operated resident seafloor robots

et al. 2022

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“…Podding refers to structurally dense and socially organized groups of organisms in aggregations. In these pods, all individuals are similar in size and are in physical contact with one another (Stone et al, 1993;Dew, 2010). Our observations are the first report of podding in the Chilean false king crab in sub-Antarctic kelp forests.…”

Section: Resultsmentioning

confidence: 52%

“…Podding behavior is probably a generalized characteristic of lithodids such as in Paralithodes J.F. Brandt, 1848 (Loher and Armstrong, 2000;Dew, 2010) and L. santolla (see Cárdenas et al, 2007). This behavior has been well documented for other crustaceans of the family Majidae, including Chionoecetes bairdi Rathbun, 1924 (Stevens et al 1994;Zhou and Shirley, 1997), Chionoecetes opilio O. Fabricius, 1788 (Comeau et al, 1998), Hyas lyratus Dana, 1851 (Stevens et al, 1992), and Maja squinado (Herbst, 1788) (Sampedro and González-Gurriarán, 2004).…”

Section: Resultsmentioning

confidence: 99%

Podding of Paralomis granulosa (Lithodidae) juveniles inhabiting kelp forests of the Cape Horn Archipelago (Chile)

et al. 2021

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Subtidal observations along the Cape Horn Archipelago, Chile (CHA) in February 2017 revealed an unusually large aggregation (or pod) of juvenile false king crabs, Paralomis granulosa (Hombron and Jacquinot, 1846), in association with kelp forests (Macrocystis pyrifera and Lessonia spp.). This is the first study to report a dense aggregation of juveniles of this crab, which was observed at Wollaston Island (WI) (~ 10 m). Paralomis granulosa was present on half the transects at WI (N=10), with a density of 3.1 ± 9.9 ind. m -2. Photographs from the podding event showed densities of P. granulosa ranging from 63 to 367 ind. plant -1 (190 ± 133 ind. plant -1 ). Juveniles (32.8 ± 7.3 mm carapace length) were recorded on kelp fronds, holdfasts, kelp stipes, and adjacent rocky bottom of this protected coast. This podding behavior resembles that of other juvenile king crabs in terms of homogeneity in size structure and may be a predator avoidance mechanism. These observations highlight three aspects of this kelp-animal relationship: (i) identification of a previously unknown ecosystem service provided by sub-Antarctic kelp forests to the associated benthic fauna; (ii) the ecological value of kelp as a bioengineering species; and (iii) pods being an important attribute for

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“…The 2.5-month lag correlation between cohort 1-3 (<1.9 cm) and cohort 4 (2-2.8 cm) could reflect the time lag between two molts, as observed between November 2012 and February 2013. The major aggregations observed in February are likely a result of gathering behavior for molting (e.g., Dew, 2010). Based on our correlation results, an additional 13.5 months were required to grow from cohort 4 to cohort 7 (from 3 cm to >5 cm).…”

Section: Discussionmentioning

confidence: 85%

Interannual Variation in the Population Dynamics of Juveniles of the Deep-Sea Crab Chionoecetes tanneri

2019

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Understanding the population dynamics of commercially fished deep-sea species, on seasonal to inter-annual scales, is of great importance in areas where fishing pressure is high. The remoteness of the deep-sea environment constitutes a challenge for monitoring these populations. The few studies that have investigated population structure of deep-sea species, have used trawls, a destructive approach for benthic ecosystems. The development of deep-sea observatories offers a continuous long-term presence on the seafloor. Using imagery from the Ocean Network Canada deep-sea observatory, video footage was acquired on a daily basis and analyzed to describe the population dynamics of the deep-sea crab Chionoecetes tanneri located in depths of 900-1000 m in Barkley Canyon, off Vancouver Island (BC, Canada). The objectives here were to describe the dynamics of the local population in relation to changes in environment and/or life-cycle related behaviors. Sampling sites were located along the canyon axis and on the canyon wall. Only juveniles (1-10 cm) were found at the axis site (1000 m depth) with densities varying from 0 to 144 individuals/m 2 . On the canyon wall (900 m depth), adults (>10 cm) were sporadically observed and densities were lower (max. 13 individuals/m 2 ). Variation in density between the two sites reflected the observed arrival of small individuals (<2.4 cm) at the axis site in summer and autumn. Apart from a distinct migration event in January 2015, intra-annual variability in density was higher than inter-annual variability as illustrated by significant annual and sub-annual cycles of 7.5 and 3.5 months. Our results confirmed the hypothesis of ontogenic migration and provide further insight into inter-molt periodicity; we demonstrated a duration of 16 months for one crab to grow from 1.8 cm to more than 5 cm. Our findings also show a correlation between population dynamics, chlorophyll concentration, surface wave height and wind speed, suggesting that surface blooms have a potential influence on the migration patterns of C. tanneri. Although our study was spatially limited (maximum surface 9 m), this innovative long-term study of a deep-sea crab demonstrates the potential of deep-sea observatories to enable research into the population dynamics of some deep-sea species.

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Podding Behavior of Adult King Crab and Its Effect on Abundance-Estimate Precision

Cited by 3 publications

References 26 publications

Transects in the deep: Opportunities with tele-operated resident seafloor robots

Transects in the deep: Opportunities with tele-operated resident seafloor robots

Podding of Paralomis granulosa (Lithodidae) juveniles inhabiting kelp forests of the Cape Horn Archipelago (Chile)

Interannual Variation in the Population Dynamics of Juveniles of the Deep-Sea Crab Chionoecetes tanneri

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