Results 11 to 20 of about 1,468 (192)
Experimental evidence that sperm maturation drives protandry in an ectotherm [PDF]
Oecologia, 2016 Protandry, i.e., the earlier arrival to breeding areas of males than females, has attracted a lot of scientific attention. However, evidence for the evolutionary hypotheses of protandry is surprisingly scarce. Here, we experimentally manipulate the time of emergence from hibernation of males, relative to females, in the common lizard, Zootoca vivipara.
Breedveld Merel C, Fitze Patrick S
core +5 more sources
Individual differences in protandry, sexual selection, and fitness [PDF]
Behavioral Ecology, 2008 Protandry is the difference in arrival date between males and females, with competition among males for access to preferred territories (the rank advantage hypothesis) or mating success (the mate opportunity hypothesis) supposedly driving the evolution of protandry. The fitness costs and benefits of protandry accruing to individuals differing in degree
Anders P. Møller +4 more
openaire +3 more sources
Protandry and sexual dimorphism in trans-Saharan migratory birds [PDF]
Behavioral Ecology, 2004 Earlier arrival to reproductive sites of males relative to females (protandry) is widespread among migratory organisms. Diverse mechanisms have been proposed that may select for protandry, including competition for limiting resources (e.g., territories) or mates.
D. Rubolini, F. Spina, N. Saino
openaire +3 more sources
Effects of climate change on the degree of protandry in migratory songbirds [PDF]
Climate Research, 2007 Current climate change is affecting the timing of life-history events of birds, such as the timing of spring arrival at the breeding grounds. Interspecific differences in the advancement of spring migration have hitherto been attributed to differences in exposure to climatic variables in win- ter or on migration, without a more detailed consideration ...
Rainio, K. +3 more
openaire +3 more sources
Exploring protandry and pupal size selection for Aedes albopictus sex separation [PDF]
Parasites & Vectors, 2018 Background We explored the possibility to improve male/female separation (sexing) in Aedes albopictus by selection of two strains, one toward increasing sex dimorphism and another toward increasing protandry.
Romeo Bellini +4 more
doaj +2 more sources
Weighing costs and benefits of mating in bushcrickets (Insecta: Orthoptera: Tettigoniidae), with an emphasis on nuptial gifts, protandry and mate density [PDF]
Frontiers in Zoology, 2012 Sexual selection is a major force driving evolution and is intertwined with ecological factors. Differential allocation of limited resources has a central role in the cost of reproduction.
Lehmann Gerlind U C
doaj +2 more sources
A SEX DIFFERENCE IN THE PROPENSITY TO ENTER DIRECT/DIAPAUSE DEVELOPMENT: A RESULT OF SELECTION FOR PROTANDRY [PDF]
Evolution; International Journal of Organic Evolution, 1992 In monandrous mating systems with discrete nonoverlapping generations males should maximize the expected number of matings by starting to emerge before females. This is known as protandry. Moreover, Evolutionarily Stable Strategies (ESS) models show that the male emergence curve should be abruptly truncated before female emergence has ceased.
Sören Nylin, Christer Wiklund
exaly +3 more sources
EcologiesLoeselia mexicana (Polemoniaceae) is a Mexican shrub with significant medicinal value since pre-Hispanic times. Despite its ethnobotanical importance and apparent role in supporting pollinator communities, detailed information about its reproductive ...
Liliana Mora-Hernández +4 more
doaj +2 more sources
Protandric Transcriptomes to Uncover Parts of the Crustacean Sex-Differentiation Puzzle
Frontiers in Marine Science, 2021 Hermaphrodite systems offer unique opportunities to study sexual differentiation, due to their high degree of sexual plasticity and to the fact that, unlike gonochoristic systems, the process is not confined to an early developmental stage. In protandric
Tom Levy +12 more
doaj +1 more source
Innate sex differences in the timing of spring migration in a songbird. [PDF]
PLoS ONE, 2012 In migrating animals protandry is the phenomenon whereby males of a species arrive at the breeding grounds earlier than females. In the present study we investigated the proximate causes of protandry in a migratory songbird, the northern wheatear ...
Ivan Maggini, Franz Bairlein
doaj +1 more source