Sökning: "pipefish"

Visar resultat 1 - 5 av 10 avhandlingar innehållade ordet pipefish.

1. 1. Morphological and Behavioural Differentiation in a Pipefish

   Författare :Sarah Robinson-Wolrath; Anders Berglund; Mats Björklund; Felicity Huntingford; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; population differentiation; phenotypic plasticity; mate choice; pipefish; video playback; Biologi; Biology; Biologi;

   Sammanfattning : A central goal of evolutionary biology is to understand the processes responsible for morphological, genetic and behavioural differentiation between sexes and among geographically distinct populations. Perhaps the most significant processes are genetic drift, natural selection, phenotypic plasticity and sexual selection. LÄS MER

3. 2. Thinking in water : Brain size evolution in Cichlidae and Syngnathidae

   Författare :Masahito Tsuboi; Niclas Kolm; Andrew Iwaniuk; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; brain evolution; phylogenetic comparative method; the expensive tissue hypothesis; cichlid; pipefish; seahorse; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

   Sammanfattning : Brain size varies greatly among vertebrates. It has been proposed that the diversity of brain size is produced and maintained through a balance of adaptations to different types and levels of cognitive ability and constraints for adaptive evolution. LÄS MER

4. 3. Sex in Murky Waters : Anthropogenic Disturbance of Sexual Selection in Pipefish

   Författare :Josefin Sundin; Anders Berglund; Gunilla Rosenqvist; Bob Wong; Uppsala universitet; []
   Nyckelord :Mating system; Mate choice; Courtship; Eutrophication; Turbidity; Hypoxia; Ocean acidification; Syngnathidae; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

   Sammanfattning : Animals experience variation in their environment because of natural changes. However, due to anthropogenic disturbance, the speed and severity of these changes have recently increased. This thesis investigates how reproductive behaviours may be affected by human induced environmental change. LÄS MER

5. 4. Reproductive investment in Syngnathus typhle, the broad-nosed pipefish

   Författare :Ines Goncalves; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Syngnathidae; sex-role reversal; paternal care; male quality; female choice; maternal effects; reproductive compensation; embryo development; brood reduction.;

   Sammanfattning : Manuscripts: 1 - Reproductive compensation by broad-nosed pipefish females. 2 - Male size is a predictor of quality of parental care in the broad-nosed pipefish... LÄS MER

7. 5. Paternal care and brood reduction in a pipefish

   Författare :Gry Sagebakken; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Parental care; brood reduction; embryo survival; parental condition; filial cannibalism; post-mating sexual selection; HSI; sexual conflicts; Syngnathus typhle; male brooding;

   Sammanfattning : From an evolutionary and adaptive perspective, the occurrence and extent of parental care in animals (investment in offspring beyond the genetic contribution) is expected to depend on an optimal (fitness-maximizing) balance of its costs and benefits. Males of the sex-role reversed broad-nosed pipefish, Syngnathus typhle, which care for eggs and embryos and may perform brood reduction, are particularly interesting in this respect. LÄS MER