Field notes and sketches [Texas - Apr - June 1940]


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Field notes and sketches [Texas - Apr - June 1940]

Material Information

Title:
Field notes and sketches [Texas - Apr - June 1940]
Creator:
Allen, Robert Porter
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Audubon societies -- Diaries ( lcsh )
Ecology -- Florida ( lcsh )
History -- Gulf Coast (Fla.) -- 20th century ( lcsh )
Spoonbills ( lcsh )

Notes

Abstract:
The daily journals of Audubon wardens and statewide reports on certain sites and projects cover activities from 1900 to 1970, with most of the materials concentrated between the 1930s and 1950s.

Record Information

Source Institution:
University of South Florida
Holding Location:
University of South Florida
Rights Management:
The University of South Florida Libraries believes that the Item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. The Item may not be in the Public Domain under the laws of other countries.
Resource Identifier:
032958557 ( ALEPH )
890709008 ( OCLC )
A47-00172 ( USFLDC DOI )
a47.172 ( USFLDC Handle )

Postcard Information

Format:
Mixed Material

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National Association of Audubon Societies For the Protection of Wild Birds and Animals 1006 Fifth Avenue, New York, N. Y. _} L, -"t: ol ;;J " /) ::1 -.Jo.l 0 (; '.::lo?:L Z.Avw-sdW.:?L

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PAGE 164

. . . ... •.. -.. ... OF ThE FLOCK Before we can assemble enough data on the subject of Flock Composition to enable us to re ch definite and useful conclusions , we must undert e sp cial studies • And before such studies can be made , must h a ve a rea sonably thorough knowledge of al t e plumages of the Spoonbill and their relation to the age of the i n ividual . Plumage studies o f an intensive character have only rece:1tly been unc.ertaKen and although considers.ble progress h a s been made , there is still a great deal of shecking and rechecking to be one in the fiel • As anyone who h s attempted it ill under t . , it is n o matter to make a detailed reco d of the plumages and age status of a flock o Roseate poonbills. This is especially true in Florida w 'ere t he mangrove and arl -flat habitat ill often renaer extremely dificult and sametim s impossible. Tentative List o Plumase Groups. Her and there in the pages of this report udder other headings there i s mention o f the plumage or ap arent age st tus of t e birds of a S oonbill flock. H wever, t h e fact is that on hand at t e present time is very general and is not the res lt of intensive observations except in very few, relatively minor in tances. Elsewhere, un er the roper heaain we di cuss t h e plum. age of tbe species. Here, using this material as our : ... ey , we can l ist tbe different ge groups geueral y ob s erved and describe where nd len briefly, unaer what c on d i tions they have been seen. his listing !..1.Ild the discussion acco:npanylng it must be con sidered a s relim:nary a nd i s subject to correction and amplification fter fur ther s tudies. 1. Flock made u redominantl of adults in breedin pluma3e : 33 on ths • Invari a le in the imme d i ate vicinity of occupied nests. Immature birds do not seem to e toler ted in such areas during the progress of the nesting season although thre some mingling of i atures e arly ln the cycle , uring pairing nd wren the nests are firs t beng c onstructed. 2 • •

PAGE 165

f I !' • • • 3 . hun observaton i s needed to determine whe t her such birds form the bulk of non-breeding flocks of so-called "adults " tha t inhabit the vicinity o f colony. Birds in this plumage were not ob erved o n the actual nesting grounds at the Second hain in 1 94 but may ave comprised the b u l k of t h e non -breeding flock in the vicinity (on Oyster reefs , etc.) ge : Apparently many ind i vidua s in po st-mupti 1 flock are in ttis plumage . For example, most of the Spa nbills observed in Bluehill Bay on the Florida west coast by John H . Baker in 1940. were reporte by hi to be i n tnis plume.ge . ertainly a gret:.t number of' Spo...,!lbills in similar flocks on the Texas co a 8 t i n and J 1.-ne are in this pl ge (Lyd i a Ann , Arroyo Colorado) • On the other and, birds in the f irst pre-nupt i a l plum age, while present, are not numerous in the immediate vic i nity of nesting colonies. Post-nuptia l flocKs may be pred omin antly of this gl'Oup . , 4 . Flock p edominently in the firs t winter plumag e (ap proximately b to 14 onths of age): Agre t many bir s in thes post-nupti l flocks are in t i s p lumage, possibly most o f the • Ear y in the nesting cycle at the Second Chain-of-Islands t 194 ) there were a few o f these birds o n the nesting isl nd . ; but they tended to g ther elsewhere arter nesti g got under , and neve r outnumbered other plumage groups. Further study may indicate th t this group d minat:.es postnuptial 1 c k s . 5 . unvenal e (approx. l to ve not observed flocks made up in this eurl y plumage. At Bot l94v, young in plume g e tra veled close co p any vith parent birds in a dult plumage . 1hether d i s persal i s ur l dertru:en .separately by t h i s age group i s not nown. A single biru in t his plumage a ccompanied by two bira s i n the first winter plumage s observed for eve ral consecutive days ing on Cyprinodon v rieg tus an o sibly also on a s all shrimp in sh llo pond s on t he shore of San Antonio Bay just north of' the c . c . c. comp in early J ne, 194 • It was late July A ugust before young birds w re on the wing in T x c s colonies thu t same 6 . ixed floe : Lxce t on the actual nesting grounds, where all the birds are in auult breeding plumage, Spoonbills flocks are almost alv. ys acle up of' Vtirious ge group • That is to sa , so f r u s a g e i s co ncerned they are mixed fl cks. In ge er 1, it may be true that

PAGE 166

• • • • • definitely established post-nuptial flocks will be made up chiefly of birds in the first winter and first prenuptial p l umages only a s e attering of individu a l s containing the juvenal plumage . The perc eu tage of second pre-nuptial birds, which have been commonly mistaken for adults capable o f breeding , is not Known for suc h f locks. Our impression , a t the present time, is the:t second pre -nuptial birds have a tendency to migrate t o the breeding grounds with the birds in ult b reeding p lumage and attach t hemselves the vicinity of breeding colonies , thus leading to the notion tha t the Spoon bill as a species is saddled with a large percen tage of "non-breeJing V ery little i nformtition i s a vail able o n sex ratios. Of 1 5 skins examined a t t he American Museum o f Ltural History, 6 ere males, 5 \\ere fe ales and 4 . lwd not been e sexed, or at least information we"' not on t lle labels. Unmated males were a d i tinct fe6ture of the pairing stage a t the Second Chain in , 1 940 , but these app eared t o find .females •

PAGE 167

J • • SUMMARY OF COMPOSITION OF FLOCK l.. Before typical or the com.position of Spoonbill flocks in relation to inaivi dual age can be discussed, we must have a reasonably thorough k w l edge of Spoo nbill plum.ages and their relation to the age of the individual. Such kno ledge is now being aquired. 2 . A tentative list of six types of floeKs ure described. In four of these, one p articula r plum1::1ge predominates. 111 anot .1.c r type t :.e r c are various age groups, and in still 01 othe r , birds in juvenal plumage are associbted ith adults in breeding plumage. 3 . o information is available on sex ratios in a typical Spoonbill flock. U H ted males a t one Texas colony to find females • • •

PAGE 168

, ' . . . .. ' _ ,, • • t . . . \ . . , J . I . cYCLE J3EJ./.4 VIOi<.. o/ . AJAIA AJA-JA [SAN ANTONIO '!aAY I TExA.s' APP.IL k MAY lGf4-0 l I -:-NATIONAL. A.SStJCfATJON o/ AupuSoN SoctETlt:S i-----


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Phasellus ornare in augue eu imperdiet. Donec malesuada sapien ante, at vehicula orci tempor molestie. Proin vitae urna elit. Pellentesque vitae nisi et diam euismod malesuada aliquet non erat.

WIKIPEDIA

Nunc fringilla dolor ut dictum placerat. Proin ac neque rutrum, consectetur ligula id, laoreet ligula. Nulla lorem massa, consectetur vitae consequat in, lobortis at dolor. Nunc sed leo odio.