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BROOD LOSS DURING INCUBATION IN PHILOCHERAS TRISPINOSUS (DECAPODA) IN PORT ERIN BAY, ISLE OF MAN

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ABSTRACT Brood loss during incubation was studied in the crangonid shrimp Philocheras trispinosus. Concurrent changes in length, volume, and water content of eggs were followed. During embryonic development, egg length increased by some 40%, egg volume by about 130%, and water content increased from 69-85%. Egg number was an isometric function of body size in all 5 incubation stages. Brood loss did not vary with female size, and averaged 30% in egg number and 33% in brood dry weight. Brood loss occurred mainly during early and late incubation stages, predominantly the latter. Potential causes of early incubation loss are incomplete fertilization and inadequate attachment of eggs to the pleopods. Possible reasons for the large late-incubation loss include abrasion with substrate during burrowing, exacerbated by the increased egg volume.

10.2307/1549255
/content/journals/10.2307/1549255
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/content/journals/10.2307/1549255
2017-08-22

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