The pace of life in deep-dwelling squids.

Hoving, Henk-Jan T. and Robison, B. H. (2017) The pace of life in deep-dwelling squids. Deep Sea Research Part I: Oceanographic Research Papers, 126 . pp. 40-49. DOI 10.1016/j.dsr.2017.05.005.

[img] Text
1-s2.0-S0967063716303880-main.pdf - Published Version
Restricted to Registered users only

Download (712Kb) | Contact
[img] Text
mmc1.pdf - Supplemental Material
Restricted to Registered users only

Download (18Kb) | Contact

Supplementary data:

Abstract

Highlights:
• We investigated growth and longevity of three deep-sea squids from the Monterey Bay.
• We found daily growth increments in the statoliths of two deep-sea squids.
• The estimated longevities are higher than those of shallow water relatives.
• The estimated growth rates suggest a reduced pace of life in deep-sea squids.

Abstract

Coastal and epipelagic cephalopods are among the fastest growing invertebrates, with life cycles of typically 1 year or less. Evidence is accumulating that deep-sea taxa often live longer and grow slower than their shallow water relatives. We test the hypothesis that deep-sea squid show increased longevity and reduced growth rates compared to coastal and epipelagic species, by validation experiments and quantification of statolith increments of three deep-sea squids from the Monterey Submarine Canyon. The periodicity of statolith increment formation in coastal species is daily, but is unknown for deep-sea squid. Between 2010 and 2013, specimens of Chiroteuthis calyx, Galiteuthis phyllura and Octopoteuthis deletron were captured by remotely operated vehicles and trawl nets off California. ROV-captured living squid were immersed in tetracycline and kept alive in the lab for between 3 and 14 days. Correlating the number of elapsed days with the number of newly deposited statolith increments, and statolith growth after the fluorescent tetracycline mark, provided evidence of regular and daily increment deposition, in C. calyx and O. deletron. This relationship was less strong in G. phyllura and the one-increment-per-day hypothesis was not accepted for this species. Reconstructing growth rates based on statolith counts and wet weights from animals of a wide size range suggest that O. deletron is a slower growing squid (0.59% BW/day) than C. calyx (1.3% BW/day) and G. phyllura (1.2% BW/day). Octopoteuthis deletron matures at around two years, the oldest C. calyx was a mature male of 1.5 years and the eldest G. phyllura was 10 months and still immature. Maximum reported sizes for G. phyllura and C. calyx exceed those of our examined specimens, and therefore their longevity likely exceeds 2 years, in particular if the females brood their eggs. Our study supports the hypothesis that deeper living squid exhibit reduced growth rates and an increased longevity compared to shallow living species. We discuss these traits in the context of a life in the deep pelagic ocean.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.dsr.2017.05.005
ISSN: 0967-0637
Projects: Future Ocean
Date Deposited: 26 Jun 2017 12:11
Last Modified: 01 Feb 2019 15:15
URI: http://oceanrep.geomar.de/id/eprint/38545

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...