Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Seasonal pattern of filial cannibalism by Apogon doederleini mouthbrooding males (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 61 (2002), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In temperate waters of southern Japan, mouthbrooding males of the cardinal fish Apogon doederleini sometimes ate their entire brood within a day of spawning. In spite of annual variation in age structure and length of the breeding season, however, the annual cannibalism rate (broods cannibalized to total broods spawned) was nearly constant, 12–16%. Fish 1 year old frequently cannibalized early broods of the season, especially the first brood, whereas the cannibalism rate by 2 year-old fish did not vary within the season. In contrast, the cannibalism by older males increased late in the season. This tendency was attributed to their different allocation patterns to growth and reproduction. For 1 year-old fish, which can enhance future reproductive success by growth and cannibalizing on early broods instead of mouthbrooding (at relatively low temperatures), this may be a tactic for investing energy in growth. For fish 〈inlineGraphic alt="geqslant R: gt-or-equal, slanted" extraInfo="nonStandardEntity" href="urn:x-wiley:00221112:JFB633:ges" location="ges.gif"/〉 3 years, which have more breeding cycles and grow little, cannibalizing late broods may be energetic compensation for their poor somatic condition. No seasonal variation of cannibalism by 2 year-old fish can be explained by their intermediate nature of growth and reproduction. Multiple mate availability is one factor facilitating the cannibalism by 2 and 3 + year-old fish whose operational sex ratio is female-biased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2002.tb00901.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The costs of reproduction to males and females of a paternal mouthbrooding cardinalfish Apogon notatus (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 58 (2001), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In the cardinalfish Apogon notatus, starving males mouthbrood the eggs, and females are more active than males in courtship and in attacks against conspecific intruders upon their breeding territory, but sexual ornaments are developed in males. Condition factor, hepatosomatic index and fat body-somatic index declined in both sexes during the breeding season. The deterioration of somatic condition was more severe in females, suggesting that the overall energetic costs were larger for females which produced more than twice as many clutches as males brooded in a season. Selective mortality of females could be due primarily to the depletion of their energy reserves. The increased mortality in females is a possible mechanism for the male-biased operational sex ratio which may provide the potential for sexual selection on males.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb00530.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Interspecific differences in male cannibalistic behavior between two sympatric cardinalfishes (Pisces: Apogonidae) (2000)
    Springer
    Journal of ethology 18 (2000), S. 5-10 
    Details
    ISSN: 1439-5444
    Keywords: Key words Filial cannibalism ; Heterocannibalism ; Mate availability ; Operational sex ratio ; Paternal mouthbrooder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cannibalistic behavior of a paternal mouthbrooding cardinalfish, Apogon notatus, was examined and compared with that of a sympatric congener, Apogon doederleini. In both species, males sometimes cannibalized their own entire broods, but their postcannibalistic behavior was markedly different. Males of A. doederleini respawned within a few days of cannibalism, usually changing mates, whereas males of A. notatus took several weeks to respawn, less frequently changing mates. This difference was attributed to mate availability for males. The operational sex ratio was female biased in A. doederleini but male biased in A. notatus, suggesting that the former males have higher mate availability and thus opportunities for remating soon after cannibalism. For male apogonids that accept only one clutch at a time, an effective way to compensate for reproductive loss entailed by filial cannibalism is to remate as soon as possible after cannibalism. The higher rate of filial cannibalism by A. doederleini than by A. notatus suggests that this cannibalism is facilitated by high mate availability. In contrast to filial cannibalism, heterocannibalism was more frequent in A. notatus. High population density and gregariousness may be important factors contributing to the frequent occurrence of heterocannibalism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101640070017
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...