NDLI: Lake connectivity and fish species richness in southern Brazilian coastal lakes

Content Provider	Springer Nature Link
Author	Guimarães, Taís de Fátima Ramos Hartz, Sandra Maria Becker, Fernando Gertum
Copyright Year	2014
Abstract	Connectivity is a key factor in metacommunity ecology, because it influences dispersal and colonization rates. However, it has received less attention in aquatic than in terrestrial ecology research. We investigated whether connectivity is a good predictor of species richness in functional fish communities (freshwater, FS; estuarine, ES and estuarine-freshwater, EFS) from 31 coastal lakes in southern Brazil. We used a model selection approach, including lake area and distance from the ocean as additional predictors of species richness and two connectivity metrics: primary connectivity (C P) and estuarine connectivity (C E), which measure connectivity to neighboring lakes and system-wide connectivity, respectively. Both metrics estimate functional connectivity and were calculated on habitat-based cost distances. Connectivity was more important for predicting richness of functional communities than for total richness, particularly C E, which was distinctively related to each functional fish community richness (directly related to ES and EFS, and inversely related to FS; C P was related only to ES). Remarkably, connectivity was more important than area for predicting ES and EFS richness. These results add support to dispersal limitation as an important mechanism influencing fish communities. We suggest that incorporating environmental filters (habitat type) to quantify connectivity is useful for accessing the patterns of species richness.
Starting Page	207
Ending Page	217
Page Count	11
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	740
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-07-20
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Connectivity metrics Cost distance Fish assemblages Isolation Freshwater Freshwater & Marine Ecology Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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