15 research outputs found
Sisältöä vai sosiaalista vuorovaikutusta? – Digitaalinen kirjasto määritelmissä ja käytännössä
Rinnakkaistallennuksen edistämisen keinoja yliopistokirjastoissa
Julkaisujen rinnakkaistallennus on yksi tärkeä keino tieteellisen tiedon tuomisessa kaikkien kiinnostuneiden ulottuville. Rinnakkaistallennukseen on Suomessa viime vuosina panostettu yhä enemmän. Tässä artikkelissa kuvataan erilaisia keinoja, joilla rinnakkaistallenteiden määrää on lisätty kirjoittajien edustamissa yliopistokirjastoissa
Female reproduction and conspecific utilisation in an egg-carrying bug:-Who carries, who cares?
Abstract
Female ability to exploit conspecifics in reproduction may have unusual expressions. I studied the reproductive behaviour of the golden egg bug (Phyllomorpha laciniata; Heteroptera, Coreidae) experimentally in the field and in the laboratory. Female golden egg bugs lay their eggs mainly on the backs of conspecific males and other females. Non-parental eggs are often carried. Occasionally, the eggs are laid on the food plant (Paronychia spp; Polycarpea, Caryophyllaceae) of the species but typically, those eggs survive poorly due to egg parasitism and predation. I explored the dependence of female reproduction on conspecific presence and encounter rate. I also studied female current reproductive state (which depends on if she has recently oviposited) in relation to her activity as well as male choice of a female.
Female bugs preferred to oviposit on conspecifics when presented with a choice between a bug and a food plant. When alone females often did not lay eggs. Increased encounter rate with others increased female egg laying rate. Survival of carried eggs among bugs did not vary significantly although males received more eggs than females. Females with high current fecundity (mature eggs accumulated to reproductive tract) were more active than females with lower current fecundity (recently oviposited). Females with high current fecundity seemed to search for conspecifics to lay eggs on. Males also preferred to court females with high current fecundity. These females were more likely to oviposit immediately after mating, lowering the risk of female remating before oviposition.
To conclude, conspecifics are important egg-laying substrates for female golden egg bugs. Conspecific availability affects female egg laying and the rate of egg production in short term. In particular, males are necessary for egg-laying females and they typically receive unrelated eggs when they court females. Sexual interactions resulting from female polyandry are crucial factors that maintain female egg laying on the backs of males and other females in the unique reproductive system of the golden egg bug
Avoin julkaiseminen mahdollistaa harrastajalle pääsyn tiedonlähteille
Artikkeli käsittelee tieteellisen julkaisutoiminnan nykykäytäntöjä ja esittelee keinoja, mistä ja miten kuka hyvänsä tiedejulkaisuista kiinnostunut voi etsiä tiedeartikkeleita, ja saada niitä luettavaksi. Reitti tiedon valtatielle on nyt lyhyempi kuin koskaan aikaisemmin