福山魚怪的生活史與性轉變
Date Issued
2000
Date
2000
Author(s)
DOI
892611B002001
Abstract
A flesh burrowing parasitic isopod,
Ichthyoxenus fushanensis, was found
infecting the body cavity of a freshwater
fish, Varicorhinus bacbatulus, in pairs.
The pattern of sequential
hermaphroditism of I. fushanensis is
protandrous. Here we investigate the
question why selection favors
protandrous sex change for I.
fushanensis, through analyzing the
interactions among clutch size, female
size, male size and the host size.
The number of young per brood was
positively correlated with the body size
of female. When the effect of host size
is removed, there is a significant
negative correlation between the sizes of
paired males and females. This suggests
that the resources available from host
fish are limited, and that both larger
female body size and smaller male body
size are important determinants of
Ichthyoxenus fushanensis offspring
number. Due to the constraint of very
low success rate in hunting for a host of
mancas, the selection pressure favor
larger female which produce more
mancas. The pattern of interactions
among host, male, female in size and the
number of mancas, may be considered
as a selection pressure for I. fushanensis,
where the resource or available space is
constrained by the size of host.
Subjects
Ichthyoxenus fushanensis
parasitism
sex change
selection
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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