A. Weinmann, O. Koukousioura, M. Triantaphyllou, M. Langer
{"title":"入侵的浅水有孔虫对当地生物多样性的影响主要在密度超过20%时:以科孚岛为例","authors":"A. Weinmann, O. Koukousioura, M. Triantaphyllou, M. Langer","doi":"10.5194/we-23-71-2023","DOIUrl":null,"url":null,"abstract":"Abstract. Corfu Island (Greece) is located in the northern Ionian Sea and\nexhibits unique and diverse marine coastal habitats suitable for high-diversity assemblages such as shallow-water foraminifera. The island also\nlies near the current range expansion front of the invasive species\nAmphistegina lobifera. We analyzed the foraminiferal assemblages of 51 samples from 25 sites around the island, calculated diversity indices, and analyzed the community structures of foraminiferal assemblages in comparison to local environmental variables. In addition to that, using the spatial structure or relative abundances, we evaluated the effect of A. lobifera on the species richness of all\nbenthic foraminifera and habitat-specific groups. With 200 benthic foraminiferal species found, the high species richness and\nother diversity indices indicate Corfu as an area of high diversity. The\nmain ecological drivers for the assemblage compositions were water depth,\nsediment texture, and habitat (especially vegetation), resulting in three main\nassemblage clusters around the island: (1) sandy or rocky, shallow-water\nareas from the south and west; (2) deeper areas from the west; and (3) rocky, vegetated areas of variable depths from the northwest and northeastern parts of the island. Our analyses suggest that the invasive species A. lobifera affects local diversity of the foraminiferal assemblage and that these effects become apparent when the invasive species accounts for more than 10 %–20 % of the total abundance. We\nalso observed significant negative correlations with sessile epiphytes and\nsmaller miliolids. Both groups share similar microhabitats with A. lobifera and might\nbe outcompeted, which is probably further facilitated by ongoing ocean\nwarming. However, other warm-affiliated taxa (e.g., other symbiont-bearing\nspecies) initially show a positive correlation with the increasing presence\nof A. lobifera until the latter exceeds 20 %. We expect that A. lobifera and other warm-adapted\nspecies will play an increasing role in shaping future biodiversity and\nassemblage composition in this area, a feature that supports the prognosed\ntropicalization of the Mediterranean Sea.\n","PeriodicalId":54320,"journal":{"name":"Web Ecology","volume":"7 1","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Invasive shallow-water foraminifera impacts local biodiversity mostly at densities above 20 %: the case of Corfu Island\",\"authors\":\"A. Weinmann, O. Koukousioura, M. Triantaphyllou, M. Langer\",\"doi\":\"10.5194/we-23-71-2023\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract. Corfu Island (Greece) is located in the northern Ionian Sea and\\nexhibits unique and diverse marine coastal habitats suitable for high-diversity assemblages such as shallow-water foraminifera. The island also\\nlies near the current range expansion front of the invasive species\\nAmphistegina lobifera. We analyzed the foraminiferal assemblages of 51 samples from 25 sites around the island, calculated diversity indices, and analyzed the community structures of foraminiferal assemblages in comparison to local environmental variables. In addition to that, using the spatial structure or relative abundances, we evaluated the effect of A. lobifera on the species richness of all\\nbenthic foraminifera and habitat-specific groups. With 200 benthic foraminiferal species found, the high species richness and\\nother diversity indices indicate Corfu as an area of high diversity. The\\nmain ecological drivers for the assemblage compositions were water depth,\\nsediment texture, and habitat (especially vegetation), resulting in three main\\nassemblage clusters around the island: (1) sandy or rocky, shallow-water\\nareas from the south and west; (2) deeper areas from the west; and (3) rocky, vegetated areas of variable depths from the northwest and northeastern parts of the island. Our analyses suggest that the invasive species A. lobifera affects local diversity of the foraminiferal assemblage and that these effects become apparent when the invasive species accounts for more than 10 %–20 % of the total abundance. We\\nalso observed significant negative correlations with sessile epiphytes and\\nsmaller miliolids. 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Invasive shallow-water foraminifera impacts local biodiversity mostly at densities above 20 %: the case of Corfu Island
Abstract. Corfu Island (Greece) is located in the northern Ionian Sea and
exhibits unique and diverse marine coastal habitats suitable for high-diversity assemblages such as shallow-water foraminifera. The island also
lies near the current range expansion front of the invasive species
Amphistegina lobifera. We analyzed the foraminiferal assemblages of 51 samples from 25 sites around the island, calculated diversity indices, and analyzed the community structures of foraminiferal assemblages in comparison to local environmental variables. In addition to that, using the spatial structure or relative abundances, we evaluated the effect of A. lobifera on the species richness of all
benthic foraminifera and habitat-specific groups. With 200 benthic foraminiferal species found, the high species richness and
other diversity indices indicate Corfu as an area of high diversity. The
main ecological drivers for the assemblage compositions were water depth,
sediment texture, and habitat (especially vegetation), resulting in three main
assemblage clusters around the island: (1) sandy or rocky, shallow-water
areas from the south and west; (2) deeper areas from the west; and (3) rocky, vegetated areas of variable depths from the northwest and northeastern parts of the island. Our analyses suggest that the invasive species A. lobifera affects local diversity of the foraminiferal assemblage and that these effects become apparent when the invasive species accounts for more than 10 %–20 % of the total abundance. We
also observed significant negative correlations with sessile epiphytes and
smaller miliolids. Both groups share similar microhabitats with A. lobifera and might
be outcompeted, which is probably further facilitated by ongoing ocean
warming. However, other warm-affiliated taxa (e.g., other symbiont-bearing
species) initially show a positive correlation with the increasing presence
of A. lobifera until the latter exceeds 20 %. We expect that A. lobifera and other warm-adapted
species will play an increasing role in shaping future biodiversity and
assemblage composition in this area, a feature that supports the prognosed
tropicalization of the Mediterranean Sea.
Web EcologyAgricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
4.60
自引率
0.00%
发文量
6
审稿时长
17 weeks
期刊介绍:
Web Ecology (WE) is an open-access journal issued by the European Ecological Federation (EEF) representing the ecological societies within Europe and associated members. Its special value is to serve as a publication forum for national ecological societies that do not maintain their own society journal. Web Ecology publishes papers from all fields of ecology without any geographic restriction. It is a forum to communicate results of experimental, theoretical, and descriptive studies of general interest to an international audience. Original contributions, short communications, and reviews on ecological research on all kinds of organisms and ecosystems are welcome as well as papers that express emerging ideas and concepts with a sound scientific background.