NDLI: Beak measurements of octopus (Octopus variabilis) in Jiaozhou Bay and their use in size and biomass estimation

Content Provider	Springer Nature Link
Author	Xue, Ying Ren, Yiping Meng, Wenrong Li, Long Mao, Xia Han, Dongyan Ma, Qiuyun
Copyright Year	2013
Abstract	Cephalopods play key roles in global marine ecosystems as both predators and preys. Regressive estimation of original size and weight of cephalopod from beak measurements is a powerful tool of interrogating the feeding ecology of predators at higher trophic levels. In this study, regressive relationships among beak measurements and body length and weight were determined for an octopus species (Octopus variabilis), an important endemic cephalopod species in the northwest Pacific Ocean. A total of 193 individuals (63 males and 130 females) were collected at a monthly interval from Jiaozhou Bay, China. Regressive relationships among 6 beak measurements (upper hood length, UHL; upper crest length, UCL; lower hood length, LHL; lower crest length, LCL; and upper and lower beak weights) and mantle length (ML), total length (TL) and body weight (W) were determined. Results showed that the relationships between beak size and TL and beak size and ML were linearly regressive, while those between beak size and W fitted a power function model. LHL and UCL were the most useful measurements for estimating the size and biomass of O. variabilis. The relationships among beak measurements and body length (either ML or TL) were not significantly different between two sexes; while those among several beak measurements (UHL, LHL and LBW) and body weight (W) were sexually different. Since male individuals of this species have a slightly greater body weight distribution than female individuals, the body weight was not an appropriate measurement for estimating size and biomass, especially when the sex of individuals in the stomachs of predators was unknown. These relationships provided essential information for future use in size and biomass estimation of O. variabilis, as well as the estimation of predator/prey size ratios in the diet of top predators.
Starting Page	469
Ending Page	476
Page Count	8
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	12
Issue Number	3
e-ISSN	19935021
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-07-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Octopus variabilis Jiaozhou Bay beak measurement body size hood length crest length Oceanography Meteorology
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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