ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
    facet.materialart.
    Unknown
    Ivory-billed woodpecker (Campephilus principalis) persists in continental North America (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-04-30
    Description: The ivory-billed woodpecker (Campephilus principalis), long suspected to be extinct, has been rediscovered in the Big Woods region of eastern Arkansas. Visual encounters during 2004 and 2005, and analysis of a video clip from April 2004, confirm the existence of at least one male. Acoustic signatures consistent with Campephilus display drums also have been heard from the region. Extensive efforts to find birds away from the primary encounter site remain unsuccessful, but potential habitat for a thinly distributed source population is vast (over 220,000 hectares).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fitzpatrick, John W -- Lammertink, Martjan -- Luneau, M David Jr -- Gallagher, Tim W -- Harrison, Bobby R -- Sparling, Gene M -- Rosenberg, Kenneth V -- Rohrbaugh, Ronald W -- Swarthout, Elliott C H -- Wrege, Peter H -- Swarthout, Sara Barker -- Dantzker, Marc S -- Charif, Russell A -- Barksdale, Timothy R -- Remsen, J V Jr -- Simon, Scott D -- Zollner, Douglas -- New York, N.Y. -- Science. 2005 Jun 3;308(5727):1460-2. Epub 2005 Apr 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cornell Laboratory of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA. jwf7@cornell.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15860589" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arkansas ; Biological Evolution ; *Birds ; Conservation of Natural Resources ; Ecology ; Male ; Video Recording
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    A test of alternate hypotheses for helping behavior in white-fronted bee-eaters of Kenya (1989)
    Springer
    Behavioral ecology and sociobiology 25 (1989), S. 303-319 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Considerable controversy exists over the question of the importance of kin selection in the maintenance of helping behaviors among birds. We examined nine different hypotheses of how helpers might benefit from engaging in alloparental care activities. We break these into four categories: Through its activities the helper may A) improve its probability of surviving to the following breeding season, B) enhance its probability of becoming a breeder in the future, C) increase its reproductive success when it does become a breeder, and D) increase the production of non-descendent kin. The first three categories provide direct fitness gains to the helper; in the fourth, the benefit is indirect. The hypotheses are not mutually exclusive; rather their fitness effects are additive. Each hypothesis, however, makes specific and often separable predictions about both 1) the type of fitness benefits expected, and 2) the characteristics of the birds that serve as helpers. We tested these predictions using five year's data from a color marked and geneologically known population of white-fronted bee-eaters (Merops bullockoides) in Kenya. A) Survival was not related to status (breeder, helper, non-participant); nor did individuals living in large clans have better survival than those living in small ones. B) Newly formed pairs were equally likely to become future breeders irrespective of whether or not one or both individuals had helped previously. C) The mean number of young fledged by a first time breeder was unaffected by its prior helping experience. Neither were first time breeding pairs more likely to gain the services of others as their helpers than were pairs without prior helping experience. Taken together these results demonstrate that beeeaters gain very little direct benefit from alloparenting. D) Helpers did not enhance the survival of the breeders that they helped. But they did have a major effect in increasing nestling survival. Because bee-eater helpers are closely related to the nestlings they help to rear (average r=0.33), they obtain a large indirect benefit by increasing the production of non-descendent kin. We quantified the relative importance of indirect and direct benefits of helping (to the helper) using Vehrencamp's “kin index”, I k (1979). I k compares the fitness consequences of helping against an alternative strategy and calculates the proportion of the inclusive fitness gain or loss that is due to kin (indirect) benefits. Comparing the strategy sets of helping versus not helping for bee-eaters, I k=0.89 (indicating that 89% of the benefit derived from helping is indirect). When helping was compared against the alternative of breeding, I k=2.17. Values of I k greater than 1.0 indicate that direct fitness gains from the alternate strategy (breeding) are greater than those from helping. The value of 2.17 indicates that the helping strategy would not be maintained except for the indirect fitness gained through the increased production of close kin. Alloparenting in white-fronted bee-eaters can thus be considered as altruistic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302988
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The role of kinship in helping decisions among white-fronted bee-eaters (1988)
    Springer
    Behavioral ecology and sociobiology 23 (1988), S. 305-315 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary White-fronted bee-eaters (Merops bullockoides) are cooperative breeders in which half of all nesting attempts are assisted by non-breeding adults in addition to the breeding pair. These “helpers” assist in all aspects of nesting and their aid significantly increases fledging success. The social unit in these bee-eaters is an extended family clan in which multiple pairs may breed simultaneously (plural breeding). As a result, helpers often have to choose how to allocate their aid among several potential recipients to whom they are unequally related. Using five years of data from a color-marked and genealogically known population of white-fronted bee-eaters in Kenya, we examined the role of kinship in three helping “decisions”: 1) whether or not to become a helper, 2) whom to help, and 3) how much help to provide. 1) Kinship between potential donor and recipient was a significant predictor of the likelihood of helping. Fully 44% of the individuals that could have become helpers did not do so. Many of these non-helpers were unrelated mates (“in-laws”) that had paired into their partner's clan and had no genetic link to the available recipients. Others were natal clan members with only distant genealogical ties to the breeders. The conditional probability of helping (see text for definition) decreased significantly with decreasing r h(coefficient of relatedness) between the potential helper and nestling recipients. The presumed cost of helping was a second significant predictor of whether or not a bird became a helper. We considered the expending of effort in providing aid and the delaying of personal reproduction to be costs of helping. Potential helpers that had engaged in high effort activities in the few weeks prior to the helping opportunity showed a decreased likelihood of becoming helpers. Similarly, paired birds (which by virtue of having a mating partner had a greater potential of breeding) were less likely to become helpers than were single individuals. 2) Bee-eater helpers preferentially chose to aid their closest genetic relatives. The average relatedness between helpers and the nestlings receiving their aid was 0.33. This degree of kinship was significantly greater than that expected if helpers had selected recipient nests randomly from among those available within their clans. Further evidence of kin discrimination came from analysis of 115 instances in which a helper had two or more nests of differing relatedness simultaneously available as potential recipients. In 108 cases (94%), the helper aided the most closely related one. 3) The magnitude of the helping contribution (as measured by provisioning rate) showed no pattern with relatedness between donor and recipient. These data allow testing of various theoretical models for the allocation of aid among kin. Since bee-eaters helped at only one nest at a time, and selected the nest with the most closely related young available, their behavior conforms to an allor-none case of a diminishing returns model and is inconsistent with alternative models based upon the distribution of aid in proportion to relatedness. We conclude that kinship is a major determinant in the decisions both of whether to become a helper, and of whom to help, in white-fronted bee-eaters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300577
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Family structure influences mate choice in white-fronted bee-eaters (1994)
    Springer
    Behavioral ecology and sociobiology 35 (1994), S. 185-191 
    Details
    ISSN: 1432-0762
    Keywords: Key words Female choice ; Reproductive decisions ; Family dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract White-fronted bee-eaters live in patrilocal, extended family groups in which several pairs may breed simultaneously and in which helping behavior by non-breeders is common. The composition of a male's family, and his social position within it, are major predictors of his expected reproductive success. For females, the dispersing sex, a decision to pair necessitates forfeiting any potential fitness benefits available through helping in her family, in favor of the potential benefits of breeding in the male's family. Using a set of equations that incorporate the social and non-social predictors of nesting success, we develop a payoff matrix for the expected fitness (current and future) of pairing with different categories of males. Predictions generated from this payoff matrix were supported by data: (1) Females that could help close kin (and thus garner large indirect benefits) tended to remain unpaired. (2) Males with social characteristics associated with low expected reproductive success were more often rejected as potential mates by females. (3) “High-quality” males, those with potential helpers of their own, were nearly always paired. Simulation analyses were used to investigate female pairing decisions in more detail, and to test various hypotheses about possible decision rules. We demonstrate that pairing females incorporate an assessment of the family structure of potential partners into their mate choice decisions. Such social characters represent an aspect of female choice that has been underappreciated. We suggest that social characters will prove to be important components of mate choice decisions in many species where kinship and dominance considerations influence the likelihood, or success, of breeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167958
    Location Call Number Expected 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...