| reproduction and food habits of the lined seahorse, hippocampus erectus (teleostei: syngnathidae) of chesapeake bay, virginia. | the reproductive and feeding biology of the lined seahorse, hippocampus erectus, was studied in chesapeake bay. seahorses are monogamous, and males incubate the eggs received from females in a closed brood pouch (= marsupium). females do not play any parental care after mating. total sex ratio and the operational sex ratio was strongly skewed toward females. males and females had similar number of eggs/embryos and hydrated oocytes, respectively. the number of eggs/embryos found in the male brood ... | 2001 | 11340465 |
| geographic variation in feeding preference of a generalist herbivore: the importance of seaweed chemical defenses. | the ecological impacts of generalist herbivores depend on feeding preferences, which can vary across and within herbivore species. among mesoherbivores, geographic variation in host use can occur because host plants have a more restricted geographic distribution than does the herbivore, or there is local evolution in host preference, or both. we tested the role of local evolution using the marine amphipod ampithoe longimana by rearing multiple amphipod populations from three regions (subtropical ... | 2013 | 23263529 |
| no evidence for the induction of brown algal chemical defense by the phytohormones jasmonic acid and methyl jasmonate. | induced chemical defense reactions are widespread in marine brown algae. despite the evidence that the biosynthesis of defense metabolites can be up-regulated upon herbivory, we do not know how this regulation of biosynthetic pathways to secondary metabolites is achieved in brown algae. in higher plants, the phytohormone jasmonic acid (ja) is crucial for the mediation of induced chemical defenses, and several findings of this metabolite from marine sources have been reported. we tested the hypot ... | 2008 | 19020937 |
| seawater temperature alters feeding discrimination by cold-temperate but not subtropical individuals of an ectothermic herbivore. | seawater temperature varies across multiple spatial and temporal scales, yet the roles that such variation play in altering biotic interactions are poorly known. we assessed temperature-mediated feeding behavior exhibited by the herbivorous amphipod ampithoe longimana collected from cold-temperate and subtropical estuaries (27 degrees n and 41 degrees n, respectively). individuals were offered a pairwise feeding choice between lyophilized seaweeds that provide higher fitness (ulva intestinalis) ... | 2009 | 19218494 |