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Behavioral Ecology and Sociobiology

, Volume 31, Issue 4, pp 225–235 | Cite as

Communal nursing in the evening bat, Nycticeius humeralis

  • G. S. Wilkinson
Article

Summary

Nursing observations over two summers involving 76 lactating female evening bats, Nycticeius humeralis, and 128 pups in an attic in northern Missouri indicate that communal nursing occurs rarely until 2 weeks before weaning during which time over 18% of nursing bouts involve nondescendant offspring. The average relatedness among female pairs nursing non-descendant offspring, based on identity-by-descent estimates using allozyme data, was 0.04 (SE=0.12). Mitochondrial DNA d-loop sequence comparisons confirm that at most only 2 of 20 female pairs nursing non-descendant offspring came from the same matriline. Thus, females do not nurse matrilineal kin preferentially despite female natal philopatry. In addition, the average degree of relatedness within a colony (r=0.01, SE =0.03) is too low to provide any indirect benefits from communal nursing. Female error alone is insufficient to explain these observations because females tended to allow female nondescendant young to nurse but excluded nondescendant males, particularly when they had all-male litters. Furthermore, communal nursing bouts did not differ in duration from parental nursing bouts and involved 31 % of all banded females and 24% of all banded pups observed nursing. Communal nursing occurred most frequently when pups began hunting on their own and when lactating females attained their lowest average pre-fed body weight. Mortality during this period was higher for male than female pups, and relative weights implicate starvation as the cause. Time-lapse video records of four families of bats in captivity showed that the number of nursing bouts was proportional to daily weight change. I propose that these results are consistent with both immediate and delayed benefits accruing to females which experience variable hunting success. If a female with extra milk reduced her weight by dumping milk prior to her next foraging trip, she could obtain an immediate energetic benefit and maintain maximum milk production. By restricting such milk donations to nondescendant females she may also increase colony size and thereby enhance her future acquisition of information about foraging and roosting sites.

Keywords

Communal Nursing Female Pair Hunting Success Milk Donation Natal Philopatry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Axelrod R, Hamilton WD (1981) The evolution of cooperation. Science 211:1390–1396PubMedGoogle Scholar
  2. Bailey GL, Bailey RD, Jensen CL (1953) The effect of incomplete milking on the secretion of milk. Proc 13th Int Dairy Congr 2:76–83Google Scholar
  3. Bain JR, Humphrey SR (1986) Social organization and biased primary sex ratio of the evening bat, Nycticeius humeralis. Florida Sci 49:22–31Google Scholar
  4. Baker WW, Marshall SG, Baker VB (1968) Autumn fat deposition in the evening bat (Nycticeius humeralis). J Mammal 49:314–317Google Scholar
  5. Bertram BCR (1976) Kin selection in lions and evolution. In: Bateson PPG, Hinde RA (eds) Growing points in ethology. Cambridge University Press, Cambridge, pp 281–301Google Scholar
  6. Birgersson B, Ekvall K, Temrin H (1991) Allosuckling in fallow deer, Dama dama. Anim Behav 42:326–327Google Scholar
  7. Boness DJ (1990) Fostering behavior in Hawaiian monk seals: is there a reproductive cost? Behav Ecol Sociobiol 27:113–122Google Scholar
  8. Bryant MJ, Rowlinson P (1984) Nursing and suckling behaviour of sows and their litters before and after grouping in multiaccomodation pens. Anim Prod 38:277–282Google Scholar
  9. Clutton-Brock TH, Albon SD, Guinness FE (1989) Fitness costs of gestation and lactation in wild mammals. Nature 337:260–262CrossRefPubMedGoogle Scholar
  10. Connor RC (1986) Pseudo-reciprocity: investing in mutualism. Anim Behav 34:1562–1566Google Scholar
  11. Davis RB, Herreid CFI, Short HL (1962) Mexican free-tailed bats in Texas. Ecol Monogr 32:311–346Google Scholar
  12. Eales L, Bullock PJ, Slater PJB (1988) Shared nursing in captive pipistrelles (Pipistrellus pipistrellus)? J Zool 216: 584–587Google Scholar
  13. Esser K-H, Schmidt U (1989) Mother-infant communication in the lesser spear-nosed bat Phyllostomus discolor (Chiroptera, Phyllostomidae): evidence for acoustic learning. Ethology 82:156–168Google Scholar
  14. Fogden SCL (1971) Mother-young behaviour at grey seal breeding beaches. J Zool Lond 164:61–92Google Scholar
  15. Gates WH (1941) A few notes on the evening bat, Nycticeius humeralis (Rafinesque). J Mammal 22:53–56Google Scholar
  16. Gittleman JL, Thompson SD (1988) Energy allocation in mammalian reproduction. Am Zool 28:863–875Google Scholar
  17. Hamilton WD (1964) The genetical evolution of social behavior. J Theor Biol 7:1–51PubMedGoogle Scholar
  18. Harris H, Hopkinson DA (1976) Handbook of enzyme electrophoresis in human genetics. American Elsevier, New YorkGoogle Scholar
  19. Hoogland JL, Tamarin RH, Levy CK (1989) Communal nursing in prairie dogs. Behav Ecol Sociobiol 24:91–95PubMedGoogle Scholar
  20. Humphrey SR, Cope JB (1970) Population samples of the evening bat, Nycticeius humeralis. J Mammal 51:399–401Google Scholar
  21. Jones C (1967) Growth, development, and wing loading in the evening bat, Nycticeius humeralis (Rafinesque). J Mammal 48:1–19Google Scholar
  22. Loudon ASI, Kay RNB (1984) Lactational constraints on a seasonally breeding mammal: the red deer. Symp Zool Soc Lond 51:233–252Google Scholar
  23. Loudon ASI, McNeilly AS, Milne JA (1983) Nutrition and lactational control of fertility in red deer. Nature 302:145–147Google Scholar
  24. MacDonald DW (1981) Dwindling resources and the social behaviour of capybaras, (Hydrochoerus hydrochoerus) (Mammalia). J Zool Lond 194:371–391Google Scholar
  25. Mattingly DK, McClure PA (1985) Energy allocation during lactation in cotton rats (Sigmodon hispidus) on a restricted diet. Ecology 66:928–937Google Scholar
  26. McCracken GF (1984) Communal nursing in mexican free-tailed bat maternity colonies. Science 233:1090–1091Google Scholar
  27. McCracken GF, Wilkinson GS (1988) Allozyme techniques and kinship assessment in bats. In: Kunz TH (ed) Ecological and behavioral methods for the study of bats. Smithsonian Institution Press, Washington DC, pp 141–156Google Scholar
  28. Mepham B (1976) The secretion of milk. Edward Arnold Limited, SouthamptonGoogle Scholar
  29. Millar JS (1977) Adaptive features of mammalian reproduction. Evolution 31:370–386Google Scholar
  30. Muhlbock O (1959) Factors influencing the life-span of inbred mice. Gerontologia 3:177–183Google Scholar
  31. Packer C, Lewis S, Pusey A (1992) A comparative analysis of non-offspring nursing. Anim Behav 43:265–282Google Scholar
  32. Queller DC, Goodnight KF (1989) Estimating relatedness using genetic markers. Evolution 43:258–275Google Scholar
  33. Riedman ML (1982) The evolution of alloparental care and adoption in mammals and birds. Q Rev Biol 57:405–435Google Scholar
  34. Rood JP (1972) Ecological and behavioural comparisons of three genera of Argentine cavies. Anim Behav Monogr 5:1–83Google Scholar
  35. Schalm OW, Mead SW (1943) The effect of incomplete milking on chronic mastitis caused by Streptococcus agalactiae. J Dairy Sci 26:823–831Google Scholar
  36. Scherrer JA, Wilkinson GS (1992) Isolation calls of evening bats provide evidence for heritable signatures. Anim Behav in pressGoogle Scholar
  37. Steele SRE (1991) The energetics of reproduction in the evening bat, Nycticieus humeralis. University of Maryland, College Park, MS thesisGoogle Scholar
  38. Trivers RL (1971) The evolution of reciprocal altruism. Q Rev Biol 46:35–57Google Scholar
  39. Tulloch DG (1979) The water buffalo, Bubalus bubalis, in Australia: reproductive and parent-offspring behaviour. Austr Wild Res 6:265–287Google Scholar
  40. Wade MJ (1980) Kin selection: its components. Science 210:665–667Google Scholar
  41. Watkins LC (1970) Observations on the distribution and natural history of the evening bat (Nycticeius humeralis) in northwestern Missouri and adjacent Iowa. Trans Kans Acad Sci 72:330–336Google Scholar
  42. Watkins LC, Shump KAJ (1981) Behavior of the evening bat Nycticeius humeralis at a nursery roost. Am Midl Nat 105:258–268Google Scholar
  43. Wilkinson GS (1985) On estimating relatedness using genetic markers. Evol 39:1169–1174Google Scholar
  44. Wilkinson GS (1992) Information transfer at evening bat colonies. Anim Behav 44:501–518Google Scholar
  45. Wilkinson GS, Baker AEM (1988) Communal nesting among genetically similar house mice. Ethology 77:103–114Google Scholar
  46. Wilkinson GS, Chapman AS (1991) Length and sequence variation in evening bat d-loop mtDNA. Genetics 128:607–617Google Scholar
  47. Wilkinson L (1989) SYSTAT: The system for statistics. SYSTAT, Inc., EvanstonGoogle Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • G. S. Wilkinson
    • 1
  1. 1.Department of ZoologyUniversity of MarylandCollege ParkUSA

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