Latitudinal difference in biodiversity caused by higher tropical rate of increase.

Abstract:

:Tropical diversity has generally exceeded temperate diversity in the present and at points in the past, but whether measured differences have remained relatively constant through time has been unknown. Here we examine tropical vs. temperate diversities from the Neogene to Recent using the within-habitat diversity measure Fisher's alpha of Cenozoic benthic foraminifera from the temperate Central Atlantic Coastal Plain and the tropical Central American Isthmus. During the Neogene, the mean value of alpha at temperate latitudes increased 1.4 times or 40%, whereas in the tropics it increased 2.1 times or 106%. Thus, while both areas exhibit an increase of diversity with time, past differences in the rate of increase have generated a more pronounced gradient today (164%) than existed in the Miocene (80%). These data disagree with the suggestion that the world reached an equilibrium number of species during the Paleozoic and demonstrate the need to consider both temperate and tropical components in global diversity assessments.

authors

Buzas MA,Collins LS,Culver SJ

doi

10.1073/pnas.122241499

keywords:

subject

Has Abstract

pub_date

2002-06-11 00:00:00

pages

7841-3

issue

12

eissn

0027-8424

issn

1091-6490

pii

99/12/7841

journal_volume

99

pub_type

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