Onset of plural cooperative breeding in common marmoset families following replacement of the breeding male

Social suppression of cortisol in female marmosets: Role of luteinizing hormone/chorionic gonadotropin

“…Urine samples were collected using the methods described by Saltzman et al (2004a). BrieXy, marmosets were captured from their nestboxes at approximately 06:25 h, several minutes prior to lights-on, and immediately placed in a urine-collection chamber within their home cage until they urinated or until 1 h had elapsed, whichever occurred Wrst.…”

“…All assays were fully validated for use with marmoset plasma (progesterone, cortisol, CG; Saltzman et al, 1994Saltzman et al, , 1998 or urine (E 2 S; Saltzman et al, 2004a). Plasma progesterone concentrations were measured in duplicate aliquots using a heterologous enzyme immunoassay (Saltzman et al, 1994).…”

“…Urinary E 2 S concentrations were measured in duplicate aliquots by RIA as previously described (Saltzman et al, 2004a). Assay sensitivity at 90% binding was 12.01 pg (0.60 g/ml), and intra-and inter-assay CV's of a quality-control pool assayed in quadruplicate in each assay (48% binding) were 3.0 and 6.8%, respectively.…”

Different ovarian responses to potential mates underlie species-specific breeding strategies in common marmoset and Goeldi's monkey

“…In intact natal families of common marmosets, ovarian cyclicity can occur in daughters, and is associated with reduced affiliation with and increased withdrawals from the father but not with heightened agonism (Saltzman et al, 1994a). Moreover, if the father is replaced by an unrelated male, ovulatory and anovulatory daughters do not differ in the frequency with which they receive aggression from the mother (Saltzman et al, 2004). A similar situation arises in the cotton top tamarin, where eldest daughters with detectable sex steroid levels show reduced affiliation with the mother, but do not receive more aggression from her (Snowdon et al, 1993).…”

“…In three of the six common marmoset sister-sister pairs a clear difference in social status emerged between the two females relatively soon after the start of condition Trio: in each of these pairs an event of severe aggression led to one of the females becoming behaviourally dominant whilst the other one became behaviourally subordinate. As according to Saltzman et al (2004), a female was defined as subordinate to her sister if she performed submissive behaviour to, but did not receive submissive behaviour from, her sister.…”