The presence of low‐frequency narrowband phonations in the wild bottlenose dolphins’ acoustic repertoire.

2008 ◽  
Vol 124 (4) ◽  
pp. 2484-2484
Author(s):  
Natalija Lace ◽  
Stan Kuczaj
2020 ◽  
Vol 31 ◽  
pp. GCFI31-GCFI41
Author(s):  
Carlos M. Zayas Santiago ◽  
Richard S. Appeldoorn ◽  
Michelle T. Schärerer-Umpierre ◽  
Juan J. Cruz-Motta

Passive acoustic monitoring provides a method for studying grouper courtship associated sounds (CAS). For Red Hind (Epinephelus guttatus), this approach has documented spatio—temporal patterns in their spawning aggregations. This study described vocalizations produced by E. guttatus and their respective behavioral contexts in field and laboratory studies. Five sound types were identified, which included 4 calls recorded in captivity and one sound recorded in the wild, labeled as Chorus. Additionally, the Grunt call type recorded was presumed to be produced by a female. Call types consisted of variations and combinations of low frequency (50—450 Hz) pulses, grunts and tonal sounds in different combinations. Common call types exhibited diel and lunar oscillations during the spawning season, with both field and captive recordings peaking daily at 1800 AST and at 8 days after the full moon.


2018 ◽  
Vol 285 (1883) ◽  
pp. 20181123 ◽  
Author(s):  
Caitlin Karniski ◽  
Ewa Krzyszczyk ◽  
Janet Mann

Reproductive senescence is evident across many mammalian species. An emerging perspective considers components of reproductive senescence as evolutionarily distinct phenomena: fertility senescence and maternal-effect senescence. While fertility senescence is regarded as the ageing of reproductive physiology, maternal-effect senescence pertains to the declining capacity to provision and rear surviving offspring due to age. Both contribute to reproductive failure in utero making it difficult to differentiate between the two prenatally in the wild. We investigated both components in a long-lived mammal with prolonged maternal care through three parameters: calf survival, interbirth interval (IBI) and lactation period. We provide clear evidence for reproductive senescence in a wild population of bottlenose dolphins ( Tursiops aduncus ) using 34+ years of longitudinal data on 229 adult females and 562 calves. Calf survival decreased with maternal age, and calves with older mothers had lower survival than predicted by birth order, suggesting maternal-effect senescence. Both lactation period and IBIs increased with maternal age, and IBIs increased regardless of calf mortality, indicating interactions between fertility and maternal-effect senescence. Of calves that survived to weaning, last-born calves weaned later than earlier-born calves, evidence of terminal investment, a mitigating strategy given reduced reproductive value caused by either components of reproductive senescence.


Author(s):  
Kimberly C. Bagley ◽  
Kelley Winship ◽  
Teri Bolton ◽  
Preston Foerder

Social species can depend on each other for survival, helping in rearing of young, predator defense, and foraging. Personality dynamics between individuals may influence cooperative behaviors. Bottlenose dolphins (Tursiops truncatus) live in social communities and cooperate with other conspecifics to achieve goals both in the wild and in human care. We investigated the role that personality plays in the willingness of dolphins to work together. We tested five bottlenose dolphin pairs at the Roatan Institute for Marine Sciences, Honduras, with an apparatus previously used to experimentally test dolphin cooperation. Personality profiles of each dolphin were created using surveys completed by the caretakers, in particular noting two different categories of interactions: dolphin to dolphin and dolphin to world. We hypothesized that dyadic success in the cooperative task would differ based on specific personality traits of individuals. We also hypothesized that the most successful dyads would show similar types of conspecific sociality and different means of interacting with objects. Although none of the dolphin pairs cooperated to open the apparatus, individual personalities were analyzed in relation to the dolphins’ individual and mutual interactions with the apparatus as well as the pairs’ social behaviors. Playfulness, curiosity, and affiliation as well as agreeableness, and extraversion were positively related to affiliation with the apparatus and each other. These findings suggest that certain aspects of personality are indicative of affiliation or interaction by an individual dolphin. These results could guide future animal research on the relationship between personality, social interactions, and problem-solving.


1947 ◽  
Vol 25d (6) ◽  
pp. 190-215 ◽  
Author(s):  
L. Butler

The red fox (Vulpes fulva) exists in the wild in three coat colour phases; red, cross, and silver or black. These three phases result from the action of one pair of alleles, the homozygotes being silver and red and the heterozygote being cross. At least two different mutations have occurred giving rise to the Canadian gene in eastern Canada and the Alaskan gene in western Canada. The mixing of these two mutant genes complicates the gene frequency analysis.The proportions of the three colour phases are shown to vary with (1) locality, (2) state of population cycle, (3) population trend, (4) migration pressure. Of these factors the variations with locality and population trend are fairly satisfactorily explained by selection but the fluctuation of colour phase proportions with the population cycle is not. On the other hand all the facts can be explained by a migration theory, with or without selection. By migration, a mixture of native and migrant populations with different gene frequencies is obtained. Such migrations tend to be rhythmic since they are connected with the population cycle. In the year that migration took place the pelt returns reveal aberrant gene frequencies or colour phase ratios. In the following years the gene frequencies quickly approach equilibrium that may be at the premigration level or at a new one depending upon the success of the migrants in establishing themselves in the breeding population.The marked diminution in the percentage silver and cross is due to the rapid population increase in an area of low frequency of the silver producing gene and the migration of this type into areas of higher frequency.


2001 ◽  
Vol 24 (2) ◽  
pp. 360-373 ◽  
Author(s):  
Luke Rendell ◽  
Hal Whitehead

Although the majority of commentators implicitly or explicitly accept that field data allow us to ascribe culture to whales, dolphins, and other nonhumans, there is no consensus. While we define culture as information or behaviour shared by a population or subpopulation which is acquired from conspecifics through some form of social learning, some commentators suggest restricting this by requiring imitation/teaching, human analogy, adaptiveness, stability across generations, progressive evolution (ratchetting), or specific functions. Such restrictions fall down because they either preclude the attribution of culture to nonhumans using currently available methods, or exclude parts of human culture. The evidence for cetacean culture is strong in some cases, but weak in others. The commentaries provide important information on the social learning abilities of bottlenose dolphins and some interesting speculation about the evolution of cetacean cultures and differences between the cultures of different taxa. We maintain that some attributes of cetacean culture are currently unknown outside humans. While experimental studies, both in the laboratory and in the wild, have an important role in the study of culture in whales and dolphins (for instance in determining whether dolphins have a Theory-of-Mind), the real treasures will be uncovered by long-term observational studies at sea using new approaches and technologies.


Priroda ◽  
2018 ◽  
pp. 20-28
Author(s):  
Alexander Agafonov ◽  
◽  
Irina Logominova ◽  

1974 ◽  
Vol 14 (2) ◽  
pp. 235-251
Author(s):  
SEUNG-IL SHIN

Two stable mouse cell mutants A9 and RAG, which are resistant to 8-azaguanine and deficient in hypoxanthine-guanine phosphoribosyl transferase (HGPRT), have been studied in order to establish the nature of molecular changes conferring the mutant phenotypes. A specific precipitating rabbit antiserum was prepared against the normal HGPRT purified from mouse tissues, and used to test for cross-reacting material (CRM) in the mutant lysates. Neither mutants contained detectable cross-reacting material, as demonstrated by precipitation in-hibition tests. However, the L cell-derived mutant A9 was shown to have a low but significant level of HGPRT activity which was clearly different from that of the normal enzyme in the wild-type parental cell line. Compared to the wild-type enzyme, the HGPRT in A9 is extremely heat labile, and has an elevated substrate-binding constant in addition to distinct antigenic differences. Both A9 and RAG have been shown previously to revert to the normal phenotype with low frequency, thus ruling out gene deletions as a possible cause of the 8-azaguanine resistance. It is suggested that RAG could involve a recessive regulatory mutation, while A9 may contain a structurally altered HGPRT as a result of a missense mutation within the structural gene for this enzyme.


2004 ◽  
Vol 91 (1) ◽  
pp. 163-171 ◽  
Author(s):  
Andrei N. Lukashkin ◽  
Victoria A. Lukashkina ◽  
P. Kevin Legan ◽  
Guy P. Richardson ◽  
Ian J. Russell

Distortion product otoacoustic emissions (DPOAE) were recorded from wild-type mice and mutant TectaΔ ENT/Δ ENT mice with detached tectorial membranes (TM) under combined ketamine/xylaxine anesthesia. In TectaΔ ENT/Δ ENT mice, DPOAEs could be detected above the noise floor only when the levels of the primary tones exceeded 65 dB SPL. DPOAE amplitude decreased with increasing frequency of the primaries in TectaΔ ENT/Δ ENT mice. This was attributed to hair cell excitation via viscous coupling to the surrounding fluid and not by interaction with the TM as in the wild-type mice. Local minima and corresponding phase transitions in the DPOAE growth functions occurred at higher DPOAE levels in wild-type than in TectaΔ ENT/Δ ENT mice. In less-sensitive TectaΔ ENT/Δ ENT mice, the position of the local minima varied nonsystematically with frequency or no minima were observed. A bell-like dependence of the DPOAE amplitude on the ratio of the primaries was recorded in both wild-type and TectaΔ ENT/Δ ENT mice. However, the pattern of this dependence was different in the wild-type and TectaΔ ENT/Δ ENT mice, an indication that the bell-like shape of the DPOAE was produced by a combination of different mechanisms. A nonlinear low-frequency resonance, revealed by nonmonotonicity of the phase behavior, was seen in the wild-type but not in TectaΔ ENT/Δ ENT mice.


2008 ◽  
Vol 74 (24) ◽  
pp. 7684-7693 ◽  
Author(s):  
Tadashi Takahashi ◽  
Feng Jie Jin ◽  
Misao Sunagawa ◽  
Masayuki Machida ◽  
Yasuji Koyama

ABSTRACT We established a technique for efficiently generating large chromosomal deletions in the koji molds Aspergillus oryzae and A. sojae by using a ku70-deficient strain and a bidirectional marker. The approach allowed deletion of 200-kb and 100-kb sections of A. oryzae and A. sojae, respectively. The deleted regions contained putative aflatoxin biosynthetic gene clusters. The large genomic deletions generated by a loop-out deletion method (resolution-type recombination) enabled us to construct multiple deletions in the koji molds by marker recycling. No additional sequence remained in the resultant deletion strains, a feature of considerable value for breeding of food-grade microorganisms. Frequencies of chromosomal deletions tended to decrease in proportion to the length of the deletion range. Deletion efficiency was also affected by the location of the deleted region. Further, comparative genome hybridization analysis showed that no unintended deletion or chromosomal rearrangement occurred in the deletion strain. Strains with large deletions that were previously extremely laborious to construct in the wild-type ku70 + strain due to the low frequency of homologous recombination were efficiently obtained from Δku70 strains in this study. The technique described here may be broadly applicable for the genomic engineering and molecular breeding of filamentous fungi.


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