Niche-breadth of freshwater macrophytes occurring in tropical southern African rivers predicts species global latitudinal range

Kennedy, Michael P.; Lang, Pauline; Grimaldo, Julissa Tapia; Martins, Sara Varandas; Bruce, A. M.; Moore, Isabel; Taubert, Rebecca; Macleod-Nolan, Chantal; McWaters, Stephanie; Briggs, John; Lowe, Steven; Saili, K; Sichingabula, Henry M.; Dallas, Helen F.; Morrison, Sean; Franceschini, Celeste; Willems, Frank; Bottino, Flávia; Murphy, K. J.

doi:10.1016/j.aquabot.2016.09.003

Cited by 11 publications

(13 citation statements)

References 55 publications

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“…In contrast, nine of 31 species that were allocated by Kennedy et al. () to intermediate/broad niche‐breadth status (e.g. Ceratophyllum demersum L., Cyperus difformis L.) were found at our survey sites in both continents.…”

Section: Discussioncontrasting

confidence: 69%

“…Recent evidence for this in freshwater organisms, including macrophytes, is provided by Slatyer, Hirst, and Sexton () and Kennedy et al. (). Such species may, for example, utilise specialised reproductive and dispersal strategies (e.g.…”

Section: Discussionmentioning

confidence: 98%

“…Differences in species niche breadth may provide a second clue. Niche‐breadth values have been calculated (from data collected in Zambia) for 44 of the species found in our survey (Kennedy et al., ). Excluding the endemics, it is notable that none of the eight species present in our data set which were considered by these authors to have narrow‐niche breadth (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, there has been a major effort to improve understanding of the drivers of biogeographical distributions and diversity of freshwater macrophyte species, some (but by no means all) of which have broad planetary distributions (e.g. Alahuhta et al., ; Bornette, Amoros, & Lamouroux, ; Carvalho, Bini, Diniz‐Filho, & Murphy, ; Chappuis, Ballesteros, & Gacia, ; Chappuis, Gacia, & Ballesteros, ; Heikkinen, Leikola, Fronzek, Lampinen, & Toivonen, ; Kennedy et al., , ; Lang & Murphy, ; Makkay, Pick, & Gillespie, ; Morandeira & Kandus, ; Murphy et al., ; Ranieri, Gantes, & Momo, ; Redekop, Hofstra, & Hussner, ; Santamaría, ; Tapia Grimaldo et al., ). Most of these studies have examined macrophyte diversity and distributions in cool‐temperate river and lake systems, with least attention being paid to warm‐water river macrophyte communities.…”

Section: Introductionmentioning

confidence: 99%

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Environmental drivers of freshwater macrophyte diversity and community composition in calcareous warm‐water rivers of America and Africa

et al. 2017

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This study assessed the hypothesis that spatial and environmental drivers of river macrophyte diversity and community composition differ in relative importance in calcareous river systems located in warm regions of America versus Africa. We collected aquatic vegetation and spatio‐environmental data, during 2006–11, from >200 hardwater rivers, and associated floodplain waterbodies, located up to 30° north or south of the Equator, in México, Trinidad, Brazil, Argentina, U.S.A. (Florida), South Africa, Botswana and Zambia. Species rarefaction procedures were used to assess the impacts of differing sampling effort in the two continents upon estimation of γ‐diversity (“species pool”). We then used a cluster analysis approach (two‐way indicator species analysis: TWINSPAN) to classify samples into groups based upon species composition. Variation in species richness, community composition and six spatial and environmental variables, among samples making up these groups, were compared using ANOVA and Kruskal–Wallis procedures. Regression trees and redundancy analysis were used to infer the relative importance of spatial and environmental drivers in explaining variation in local species richness and species community composition between the two continents. Sorensen's index (Cs) was calculated to estimate species turnover (β‐diversity) between African and American samples. In total, 378 macrophyte taxa were recorded, with no significant difference in mean macrophyte α‐diversity between African and American sites, but with evidence for high species turnover between the two continents (Cs = 0.17). Rarefaction analysis confirmed the existence of a larger macrophyte species pool in the hardwater rivers sampled in Africa compared to America. TWINSPAN classification identified seven sample end‐groups, only one of which contained a mix of sites from both continents. PERMANOVA and non‐metric multidimensional scaling ordination analysis confirmed significant differences in community composition present in these sample‐groups. There were substantial differences between the sample‐groups for α‐diversity, and for spatial and environmental variables. The high species turnover between Africa and America may be accounted for by geographical segregation, along with differences in aquatic habitat characteristics, and varying long‐distance dispersal capacities of individual species. The relative importance of spatial and physicochemical drivers (latitude, pH, altitude, alkalinity and electrical conductivity but not flow) differed between the continents in influencing variation in both macrophyte diversity and community composition. Latitude was a significant, although nonlinear and rather complex, spatial driver of macrophyte α‐diversity in both American and African hardwater rivers. Water chemistry variables varied in relative importance as drivers of macrophyte α‐diversity for African and American sites individually, and for all sites combined, but pH and/or electrical conductivity were more important than alkalinity in each cas...

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Section: Discussioncontrasting

confidence: 69%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Environmental drivers of freshwater macrophyte diversity and community composition in calcareous warm‐water rivers of America and Africa

et al. 2017

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“…In this context, for both macrophytes and other freshwater biota, latitude should be considered a biogeographical summary of both the historical and present influence of a range of interacting individual spatio‐bio‐environmental variables that collectively shape community composition, range‐size, abundance, distribution, and diversity of freshwater organisms in inland waterbodies across the Earth (e.g. Crow, 1993; Duarte & Kalff, 1987; Grimaldo et al., 2016, 2017; Kennedy et al., 2017; Murphy et al., 2019; Rørslett, 1991; Viana et al., 2015). Several patterns in the characteristics of biota relating to latitude occur at large spatial scales (e.g.…”

Section: Introductionmentioning

confidence: 99%