Components of reproductive effort and delay of larval metamorphosis in tropical marine shrimp (crustacea: decapoda: caridea and stenopodidea) /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1990.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Components of reproductive effort were examined in eight species of caridean shrimps and four species of stenopodidean shrimps collected from tropical marine habitats. Parameters of reproductive output were compared using regression analysis of egg number, brood weight, and brood volume versus body length, carapace length and weight of the shrimps. In the stenopodideans examined, female weight explained 71%, 61%, and 62% of the variance in egg number, brood weight, and breed volume, respectively. In the carideans examined, female weight was the principal determinant of brood weight and volume, accounting for 59% and 55% of the variance, respectively. A greater portion of the variance (63%) in egg number was explained by carapace length. Egg size had a slight increase with increasing body size. There was a trade-off between egg size and the number of eggs in an egg mass. At the interspecific level, four caridean families and two stenopodidean families were compared. At the intraspecific level, specimens of Stenopus hispidus from the Atlantic were contrasted with specimens from the Pacific. Those from the Atlantic showed a stronger correlation of body size to egg number and brood weight, while those from the Pacific had a higher correlation of body size to brood volume. The length of larval growth in relation to survival ability of shrimp larvae for long periods until metamorphically competent was determined for three species of Lysmata. Larvae metamorphosed into the decapodid stage in 34-69 days after XIII-XXV larval instars when provided with adequate food. Larval duration and total instar number were closely related to the geographical range of each species. Three commensal species of Periclimenes were tested to determine if their larvae would metamorphose in the presence of host actinarians or host exudates. Host specificity was demonstrated with host exudates; showing an overall shorter larval duration within fewer larval instars when exposed to exudates of the preferred anemone. Examination of reproductive effort and delay of larval metamorphosis allowed inferences to be formulated regarding the capacity of long-distance dispersal and the subsequent ecological, zoogeographical and evolutionary implications for these tropical shrimp. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Zoology." |
| Physical Description: | xvi, 177 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |