Urbanization impacts the taxonomic and functional structure of aquatic macroinvertebrate communities in a small Neotropical city
Due to habitat fragmentation, resource disruption and pollution, urbanization is one of the most destructive forms of anthropization affecting ecosystems worldwide. Generally, human-mediated perturbations dramatically alter species diversity in urban sites compared to the surroundings, thus influencing the functioning of the entire ecosystem. We investigated the taxonomic and functional diversity patterns of the aquatic macroinvertebrate communities in tank bromeliads by comparing those found in a small Neotropical city with those from an adjacent rural site. Changes in the quality of detrital inputs in relation to lower tree diversity and the presence of synanthropic species are likely important driving forces behind the observed structural changes in the urban site. Leaf-litter processors (i.e., shredders, scrapers) were positively affected in the urban site, while filter-feeders that process smaller particles produced by the activity of the shredders were negatively affected. Because we cannot ascertain whether the decline in filter-feeders is related to food web-mediated effects or to competitive exclusion (Aedes aegypti mosquitoes were present in urban bromeliads only), further studies are necessary to account for the effects of intra-guild competition or inter-guild facilitation.
KeywordsAedes aegypti Bioindicator Diversity Functional traits Tank bromeliads Urban ecology
We are grateful to Andrea Yockey-Dejean for proofreading the manuscript, the Laboratoire Environnement de Petit Saut for furnishing logistical assistance, and the municipality of Sinnamary (through the Department of the Environment) for permitting us to work inside the city limits. This study has benefited from an Investissement d’Avenir grant managed by the Agence Nationale de la Recherche (CEBA, ref. ANR-10-LABX-0025). ST and OD were funded by a PhD scholarship (Université Antilles-Guyane for ST; French Centre National de la Recherche Scientifique and the Fond Social Européen for OD).
- Belkin JN, Heinemann SJ (1976) Collection records of the project "mosquitoes of middle America". 4. Leeward Islands: Anguilla (ANG), Antigua (ANT), Barbuda (BAB), Montserrat (MNT), Nevis (NVS), St. Kitts (KIT). Mosq Syst 8:123–162Google Scholar
- Chadee DD, Ward RA, Novak RJ (1998) Natural habitats of Aedes aegypti in the Caribbean–a review. J Am Mosquito Cont 14:5–11Google Scholar
- Christophers S (1960) Aedes aegypti (L.) the yellow fever mosquito: its life history, bionomics and structure. Cambridge University Press, London, UKGoogle Scholar
- INSEE (2012) Institut national de la statistique et des études économiques. Open data http://www.insee.fr/
- Lane J (1953) Neotropical Culicidae, vol I and II. Universidade de São Paulo, São Paulo, BrazilGoogle Scholar
- McKinney ML (2002) Urbanization, biodiversity, and conservation. The impacts of urbanization on native species are poorly studied, but educating a highly urbanized human population about these impacts can greatly improve species conservation in all ecosystems. Bioscience 52:883–890CrossRefGoogle Scholar
- Merritt RW, Cummins KW (2008) An introduction to the aquatic insects of North America. Kendall Hunt Publishing Company, Dubuque, USAGoogle Scholar
- Talaga S (2016) Ecologie, diversité et évolution des moustiques (Diptera: Culicidae) de Guyane française : implications dans l’invasion biologique du moustique Aedes aegypti. PhD thesis, Université de Guyane, Faculté des Sciences Exactes et NaturellesGoogle Scholar