Sperm removal by dusky frillgoby

Analysis code; Paternity data; Concentration data; Compensation data; Faning duration data; Occurrence of fanning dat

Early filial cannibalism revisited from an endocrinological perspective

Offspring desertion by parents generally occurs at an early stage of parental care, which is considered to minimize the time and energy costs of parental care prior to desertion and ensure an opportunity and time for future reproduction. In addition to these conventional reasons, we investigated the effects of endocrinological constraint on early total filial cannibalism in fish in which care-giving males eat all eggs and restart reproduction when tending a small number of eggs. The occurrence of total filial cannibalism in male Rhabdoblennius nitidus, a paternal brooding blennid fish with androgen-dependent brood cycling, was strongly associated with decreased plasma 11-ketotestosterone levels, suggesting that males in which it was difficult to exhibit courtship behavior began to cannibalize eggs. Moreover, the additional mating probability at the beginning of parental care may delay the timing of total filial cannibalism; at the same time, the costs of parental care may shift the timing earlier than expected based on androgen decline. These results suggest the potential importance of considering endocrinological constraints with respect to the adaptivity of behavioral traits.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Sperm removal by dusky frillgoby

Raw data of paternity analysis; Raw data of compensatory behaviour analysi

Timing of sneaking behavior in the dusky frillgoby Bathygobius fuscus sneaker males

Sneaking is a parasitic reproductive behavioral tactic for stealing fertilization opportunities from other males that monopolize females; therefore, sneaker males always face sperm competition. The timing of sneaking is an important trait that contributes to their fertilization success. In the dusky frillgoby Bathygobius fuscus, an intertidal gobiid fish, spawning between a nest-holding male and a paired female continues over several hours. We investigated the behavior of sneaker males of this species in the wild by examining the number of sneaker males around the nest, aggressive interactions between sneaker males, sneaking attempts, and sneak intrusions as indices of their sneaking motivation. Pair spawning lasted for 23.7–192.8 min, during which a maximum of 0–23 sneaker males were observed around the nests. All indices of sneaking motivation, except the number of sneak intrusions, significantly decreased with time elapsed since the pair spawning began. This suggests that sneaking motivation was high at the early stage of pair spawning. Early sneaking may contribute to high fertilization success of sneaker males, likely owing to the long-surviving effect of their long-lived spermTHIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Filial cannibalism by male fish as an infanticide to restart courtship by self-regulating androgen levels

Raw data of egg-manipulation experiments; Raw data of the relationship between male body condition and types of filial cannibalis