Reproductive and morphometric traits of hololimnetic Macrobrachium amazonicum from the Pantanal, Brazil


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Klaus.Anger [ at ] awi.de

Abstract

When reproductive and morphometric traits are compared with literature data from allopatric estuarine and inland populations living in the Amazon and Orinoco plains, shrimps from the Pantanal show conspicuous peculiarities: (1) maximum body size reaches only about one third to one half (males and females, respectively) of the maxima observed in other populations, suggesting shorter longevity; (2) females grow consistently to larger size than males, while the opposite pattern is typical of other populations; (3) different male morphotypes, associated with mate-guarding behaviour, are common in other populations, but absent in Pantanal shrimps; all males belong to the “translucent claw” type, showing pure-search mating behaviour; (4) minimum sexable size (appearance of smallest males with appendix masculina) and (5) minimum size of ovigerous females are smaller than in other populations; this indicates a heterochronic shift (predisplacement) of sexual maturation, which may compensate for a shorter life span, suggesting r-selection. In summary, our data show biologically relevant differences in life-history traits of shrimps from the Pantanal compared to M. amazonicum in other regions. All these differential traits persist also in long-term cultures maintained under identical constant conditions (common-garden experiments).



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Conference (Poster)
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Not peer-reviewed
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Published
Event Details
10th Colloquium Crustacea Decapoda Mediterranea and The Crustacean Society Summer Meeting, 03 Jun 2012 - 07 Jun 2012, Athens, Greece.
Eprint ID
30711
Cite as
Hayd, L. and Anger, K. (2012): Reproductive and morphometric traits of hololimnetic Macrobrachium amazonicum from the Pantanal, Brazil , 10th Colloquium Crustacea Decapoda Mediterranea and The Crustacean Society Summer Meeting, Athens, Greece, 3 June 2012 - 7 June 2012 .


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