Sökning: "pipefish"
Visar resultat 6 - 10 av 10 avhandlingar innehållade ordet pipefish.
6. Sex-role reversal in two pipefish (Syngnathidae) species : paternal care and male limitation of female reproductive success
Sammanfattning : .... LÄS MER
7. Mutual Mate Choice in the Deep Snouted Pipefish Syngnathus typhle
Sammanfattning : This thesis integrates the fields of sexual selection, parental investment and sex role theory by investigating mutual mate choice and mate competition in the sex role reversed deep snouted pipefish Syngnathus typhle (Pisces: Syngnathidae) through a series of laboratory experiments. In S. LÄS MER
8. Mate choice and sexual selection in two species of sex-role reversed pipefish (Syngnathidae)
Sammanfattning : .... LÄS MER
9. Sperm motility in Gasterosteiform fishes : The role of salinity and ovarian fluid
Sammanfattning : In externally fertilising fishes, various factors in the surrounding environment may influence the viability of the sperm and eggs, thus determining the success of reproduction. In this thesis, the influence of salinity and ovarian fluid on sperm motility has been investigated in three Gasterosteiform fishes. LÄS MER
10. Egg size evolution and paternal care in pipefishes
Sammanfattning : In this thesis I explore how sexual selection, sexual conflicts, coevolution with parental care and an environmental selective agent (hypoxia) affect the evolution of different egg characteristics and embryo survival and size in pipefishes (Syngnathidae). In the broad-nosed pipefish, Syngnathus typhle Linnaeus, both sexes prefer to mate with large partners; large females produce more and larger eggs and large males can care for more young, and, as shown in this thesis, invest more per embryo and provide better oxygenation during brooding. LÄS MER