NDLI: Spatial variation in population dynamics of the sand-burrowing amphipod Haustorioides japonicus

Content Provider	Springer Nature Link
Author	Suzuki, Yuya Yamahira, Kazuri Kajihara, Naoto Takada, Yoshitake
Copyright Year	2012
Abstract	Densities of sandy beach organisms along coastlines often vary considerably even within small local scales. In order to understand the demographic basis of density variations in shore animals, we examined the population dynamics of the amphipod Haustorioides japonicus Kamihira, which is an ideal subject because it lacks a planktonic dispersal stage in its life history. Quantitative sampling at three adjacent sandy beaches along the Sea of Japan coast revealed that the spring density, i.e., the density of overwintered individuals, was similar among the three beaches. However, the amount of recruitment of newly hatched juveniles from late spring to summer greatly differed among the beaches, resulting in large spatial variations in the summer density. Cohort analyses revealed that at all beaches, young-of-the-year (YOY) individuals reproduced and then died, and that individuals which recruited in late summer overwintered. Moreover, growth, fecundity, and survival schedules of overwintered and YOY individuals were very similar among beaches. These observations suggest that the difference in recruitment success, i.e., the survival of newly hatched juveniles, is the primary cause of the inter-population variation in the summer density. It is likely that variations in salinity and sandy sediment affect the recruitment success of newly hatched individuals. This study indicates that biological productivity may differ substantially even among adjacent sandy beaches, with important implications for beach management.
Starting Page	107
Ending Page	119
Page Count	13
File Format	PDF
ISSN	14383896
Journal	Population Ecology
Volume Number	55
Issue Number	1
e-ISSN	1438390X
Language	English
Publisher	Springer Japan
Publisher Date	2012-12-07
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amphipod Body size Demography Reproduction Sandy shore Seasonal density fluctuation Ecology Zoology Plant Sciences Evolutionary Biology Behavioural Sciences Forestry
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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