By James G. Dickson
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Extra resources for The Role of Insectivorous Birds in Forest Ecosystems
XT97D) . Bull. Ecol, Res. , No. £ , Lund. Auk 94, 38 0, Shields, L U . (1977) Üilson Bull. 86,125, Shields, ΙΑΙ. and Grubb, T XI974) Avian Census Techniques Snow, D. (1965). B i r d 5tudy 12, 287. Svensson, 5. (197D7^ B u l l . E c o l . R e s . Comm. , Mo. 9_. lAJeber, IÀJ. , and T h e b e r g e , J . XTÏÏ77) . Wilson B u l l . 8J3, 5 4 3 . lAJilliams, A. (1936). E c o l . JYIonogr. J5, 3 1 7 . l A J i l l i a m s o n , K. (1964). B i r d Study 1 1 , 1 . W i n k l e r , W. (1932). W e r h a n d l .
E c o l . R e s . Comm. , Mo. 9_. lAJeber, IÀJ. , and T h e b e r g e , J . XTÏÏ77) . Wilson B u l l . 8J3, 5 4 3 . lAJilliams, A. (1936). E c o l . JYIonogr. J5, 3 1 7 . l A J i l l i a m s o n , K. (1964). B i r d Study 1 1 , 1 . W i n k l e r , W. (1932). W e r h a n d l . Z D O I . B o b . Ges. Wein 81G, 5 3 . Y a p p , W. (1956). B i r d Study 3, 93. 51 The Role of Insectivorous Birds in Forest Ecosystems SAMPLING CONSIDERATIONS FOR EVALUATING THE EFFECTS OF MORTALITY AGENTS ON BARK BEETLES Robert Coulson Department of Entomology Texas AÇM University College Station, Texas Paul Pulley Data Processing Center Texas A£M University College Station, Texas Lewis Edson Department of Entomology Texas A£M University College Station, Texas Basic requirements for estimating effects of mortality agents on bark beetle populations are examined.
Method A's assumptions are untenable, usually incorrectable, and perhaps the method should be abandoned. Method B will overestimate density for conspicuous species, but all transect density techniques seriously underestimate absolute abundance (see Cue Frequency, below). ÍAJhile this tendency may decrease its internal consistency, it may actually improve its accuracy. For within species comparisons, no harm is done. Emlen's method (c) is the only internally consistent method, but only at the cost in decreased efficiency necessitated by determining each contact's position.
The Role of Insectivorous Birds in Forest Ecosystems by James G. Dickson