title: Climate-driven range extension of Amphistegina (protista, foraminiferida): models of current and predicted future ranges.
abstract: Species-range expansions are a predicted and realized consequence of global climate change. Climate warming and the poleward widening of the tropical belt have induced range shifts in a variety of marine and terrestrial species. Range expansions may have broad implications on native biota and ecosystem functioning as shifting species may perturb recipient communities. Larger symbiont-bearing foraminifera constitute ubiquitous and prominent components of shallow water ecosystems, and range shifts of these important protists are likely to trigger changes in ecosystem functioning. We have used historical and newly acquired occurrence records to compute current range shifts of Amphistegina spp., a larger symbiont-bearing foraminifera, along the eastern coastline of Africa and compare them to analogous range shifts currently observed in the Mediterranean Sea. The study provides new evidence that amphisteginid foraminifera are rapidly progressing southwestward, closely approaching Port Edward (South Africa) at 31°S. To project future species distributions, we applied a species distribution model (SDM) based on ecological niche constraints of current distribution ranges. Our model indicates that further warming is likely to cause a continued range extension, and predicts dispersal along nearly the entire southeastern coast of Africa. The average rates of amphisteginid range shift were computed between 8 and 2.7 km year(-1), and are projected to lead to a total southward range expansion of 267 km, or 2.4° latitude, in the year 2100. Our results corroborate findings from the fossil record that some larger symbiont-bearing foraminifera cope well with rising water temperatures and are beneficiaries of global climate change.
authors: Steinmann Institut für Geologie, Mineralogie und Paläontologie, Rheinische Friedrich-Wilhelms Universität, Bonn, Germany. martin.langer@uni-bonn.de
authors: Martin R
authors: MR
authors: Langer
authors: Anna E
authors: AE
authors: Weinmann
authors: Stefan
authors: S
authors: Lötters
authors: Joan M
authors: JM
authors: Bernhard
authors: Dennis
authors: D
authors: Rödder
mesh_terms: D000349:Africa; D057231:Climate Change; D017753:Ecosystem; D056908:Foraminifera / Q000254:growth & development*; D005580:Fossils; D008522:Mediterranean Sea; D008954:Models, Biological
references: Ecol Appl. 2009 Jan;19(1):181-97
references: 19323182
references: Science. 2008 Oct 10;322(5899):182-3
references: 18845723
references: Proc Natl Acad Sci U S A. 2008 Aug 12;105(32):11081-6
references: 18685101
references: Science. 2006 May 26;312(5777):1179
references: 16728633
references: Nature. 2010 Aug 26;466(7310):1098-101
references: 20668450
references: Science. 2005 Jun 24;308(5730):1912-5
references: 15890845
references: Science. 2001 Apr 13;292(5515):270-4
references: 11303099
references: Proc Natl Acad Sci U S A. 2012 Aug 28;109(35):14046-51
references: 22904189
references: J Eukaryot Microbiol. 2008 May-Jun;55(3):163-9
references: 18460153
references: Science. 1988 Jun 3;240(4857):1285-93
references: 3287615
references: Science. 2011 Jul 22;333(6041):418-22
references: 21778392
references: Science. 2001 Apr 27;292(5517):686-93
references: 11326091
references: Proc Natl Acad Sci U S A. 2006 Sep 26;103(39):14288-93
references: 17001018
references: Nature. 2003 Jan 2;421(6918):57-60
references: 12511952
references: Science. 2010 Nov 5;330(6005):763-4
references: 21051620
references: Science. 2010 Jun 18;328(5985):1523-8
references: 20558709
references: Nature. 2003 Jan 2;421(6918):37-42
references: 12511946