Journal article
IANULA: AN ACCOUNT OF THE HISTORY AND DEVELOPMENT OF THE LAGO DI MONTEROSI, LATIUM, ITALY: VIII. THE FOSSIL FLORA AND FAUNA (OTHER THAN SILICEOUS FOSSILS, POLLEN, AND CHIRONOMID HEAD CAPSULES)
TRANS AMER PHIL SOC. 60(PART 4): 102-111. 1970. ILLUS
01 Jan 1970
Abstract
THE EARLY BIOTIC HISTORY OF LAGO DI MONTEROSI WAS CHARACTERIZED BY AN INITIAL DEVELOPMENT OF AN UNPRODUCTIVE LITTORAL COMMUNITY FOLLOWED BY A VERY LONG INTERVAL, APPROXIMATELY 22,000 YR, OF EXTREMELY LOW PRODUCTIVITY WHEN MOST PLANT AND ANIMAL MICROFOSSILS WERE RARE OR ABSENT IN THE SEDIMENT. THIS PERIOD ENDED ABRUPTLY AS A RESULT OF CULTURAL DISTURBANCES (SOME 2300 TO 2500 YR AGO) THAT INITIATED THE DEVELOPMENT OF LARGE POPULATIONS OF BLUE-GREEN ALGAE, CHYDORID CLADOCERA, AND MIDGES. THIS HIGHLY EUTROPHIC ENVIRONMENT WAS RELATIVELY SHORT-TERMED AND WAS REPLACED BY A LESS EUTROPHIC PHASE, DOMINATED BY PEDIASTRUM AND THE CLADOCERAN; BOSMINA LONGIROSTRIS. POPULATIONS REPRESENTING THE LATTER BIOTA GRADUALLY DECLINED AND THERE AGAIN ENSUED A RATHER LONG INTERVAL IN THE SEDIMENT OF RELATIVELY LOW MICROFOSSIL POPULATIONS. A 2ND MAJOR CULTURAL DISTURBANCE BEGAN SOMETIME IN THE 10TH OR 11TH CENTURY, CAUSING A RENEWED EXPANSION OF THE BIOTA WITH P. SIMPLEX, B. LONGIROSTRIS, AND THE 2 LIMNICOLE CHYDORIDS, LEYDIGIA LEYDIGI AND L. ACANTHOCERCOIDES, AS THE DOMINANT FORMS. ALTHOUGH THE INTENSITY OF CULTURAL DISTURBANCES LATER DECREASED, AS SEEN IN THE SMALLER MICROFOSSIL POPULATIONS ABOVE 23 CM, THE SAME ORGANISMS CONTINUED TO DOMINATE THE BIOTA. HOWEVER, IN RECENT YEARS THE LAKE HAS ACQUIRED A VERY DIFFERENT FAUNA, NOT SEEN IN THE SEDIMENT, THAT MAY HAVE DEVELOPED AS A RESULT OF A SHARP FALL IN WATER LEVEL FROM 8 TO 5 M. (SEE ALSO W72-05208 AND W72-05209)--COPYRIGHT 1971, BIOLOGICAL ABSTRACTS, INC.
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- Title
- IANULA: AN ACCOUNT OF THE HISTORY AND DEVELOPMENT OF THE LAGO DI MONTEROSI, LATIUM, ITALY: VIII. THE FOSSIL FLORA AND FAUNA (OTHER THAN SILICEOUS FOSSILS, POLLEN, AND CHIRONOMID HEAD CAPSULES)
- Creators
- Clyde Goulden
- Publication Details
- TRANS AMER PHIL SOC. 60(PART 4): 102-111. 1970. ILLUS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Academy of Natural Sciences of Drexel University
- Identifiers
- 991019350660904721