Zooplankton responses to sandbar opening in a tropical eutrophic coastal lagoon

Santangelo, Jayme M.; Rocha, Adriana de Melo; Bozelli, Reinaldo Luiz; Carneiro, Luciana S.; Esteves, Francisco de Assis

doi:10.1016/j.ecss.2006.09.021

Cited by 60 publications

(51 citation statements)

References 27 publications

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“…On the other hand, variations in the salinity are strongly related to freshwater inputs from their catchment area in the orthogonally-oriented lagoons. Temporal coherence in the salinity among coastal lagoons has important ecological consequences regarding our ability to predict how future scenarios of rising sea levels that have originated from climate change might affect broad-scale salinisation patterns of coastal inland aquatic systems, a phenomenon that purportedly has pronounced effects on the community structure and functioning of resident biota of the coastal lagoons (Caliman et al, 2007;Santangelo et al, 2007;Bozelli et al, 2009;Laque et al, 2010). Despite the considerations mentioned above, the salinity coherence was somewhat low, with more than half of the total number of correlations showing non-significant results.…”

Section: Discussionmentioning

confidence: 99%

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

et al. 2010

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Temporal coherence (i.e., the degree of synchronicity of a given variable among ecological units within a predefined space) has been shown for several limnological features among temperate lakes, allowing predictions about the structure and function of ecosystems. However, there is little evidence of temporal coherence among tropical aquatic systems, where the climatic variability among seasons is less pronounced. Here, we used data from long-term monitoring of physical, chemical and biological variables to test the degree of temporal coherence among 18 tropical coastal lagoons. The water temperature and chlorophyll-a concentration had the highest and lowest temporal coherence among the lagoons, respectively, whereas the salinity and water colour had intermediate temporal coherence. The regional climactic factors were the main factors responsible for the coherence patterns in the water temperature and water colour, whereas the landscape position and morphometric characteristics explained much of the variation of the salinity and water colour among the lagoons. These results indicate that both local (lagoon morphometry) and regional (precipitation, air temperature) factors regulate the physical and chemical conditions of coastal lagoons by adjusting the terrestrial and marine subsidies at a landscape-scale. On the other hand, the chlorophyll-a concentration appears to be primarily regulated by specific local conditions resulting in a weak temporal coherence among the ecosystems. We concluded that temporal coherence in tropical ecosystems is possible, at least for some environmental features, and should be evaluated for other tropical ecosystems. Our results also reinforce that aquatic ecosystems should be studied more broadly to accomplish a full understanding of their structure and function.Keywords: synchrony, temporal coherence, local factors, regional factors, shallow lakes, coastal lagoons. Coerência temporal entre lagoas costeiras tropicais: uma busca por padrões e mecanismos ResumoA coerência temporal (i.e., o nível de sincronismo de uma dada variável ecológica entre unidades ecológicas) tem sido demonstrada para uma vasta gama de variáveis limnológicas em lagos de clima temperado, permitindo que predições sobre a estrutura e o funcionamento destes ecossistemas sejam realizadas. Entretanto, há pouca evidência da coerência temporal de variáveis limnológicas entre ecossistemas aquáticos tropicais, onde a variação climática é menos pronunciada entre as estações do ano. Neste estudo, utilizamos dados de longa duração do monitoramento de variáveis físicas, químicas e biológicas para testar a ocorrência de coerência temporal entre 18 lagoas costeiras tropicais. A temperatura da água e a concentração de clorofila-a apresentaram, respectivamente, a maior e a menor coerência temporal entre as lagoas, enquanto que a salinidade e a coloração da água apresentaram padrões intermediários. Fatores climáticos regionais foram os principais fatores responsáveis pelos padrões de coerência da temperatura e coloração d...

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Section: Discussionmentioning

confidence: 99%

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

et al. 2010

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“…Additionally, the fish community of the Patos lagoon estuary (south Brazil) was largely influenced by ENSO episodes, favoring euryhaline or freshwater species at different times (Garcia et al, 2001). Finally, the high resilience time of the freshwater zooplankton community of the Imboassica lagoon (southeast Brazil) after disturbance by salinity increase was partially attributed to low precipitation in the region during an El-Niño event (Santangelo et al, 2007).…”

Section: Ncl Conservation and Managementmentioning

confidence: 99%

“…A growing body of evidence has demonstrated a negative correlation between salinity and species richness in coastal lagoon biodiversity, either when the salinity effects are demonstrated across lagoons (Schallenberg et al, 2003;Sosa-López et al, 2007) or when it is demonstrated spatially and temporally in a same lagoon (Attayde and Bozelli, 1998;Santangelo et al, 2007). However, other studies have shown some positive effects of salinity on NCL biodiversity (Koslowsky- Suzuki and Bozelli, 2004), indicating that effects of salinity can be context dependent.…”

Section: Causes Of Ncl Biodiversitymentioning

confidence: 99%

“…We propose that the strength and direction of salinity effects on both local and regional NCL biodiversity will depend on whether the intensity of its spatial and temporal effect will be weak enough to avoid species extinction and strong enough to promote species coexistence. Locally, salinity increases may reduce coastal lagoon biodiversity if its effect is strong enough to directly extinguish physiological-sensitive species (Santangelo et al, 2007) or indirectly extinguish species that are important in stabilizing species interactions. (e.g.…”

Section: Causes Of Ncl Biodiversitymentioning

confidence: 99%

“…In these cases, the impacts of such disturbances are promptly reflected in the aquatic communities, especially due to water level reduction and increased salinities. A decrease in species richness and diversity is commonly observed for a variety of aquatic communities, in addition to changes in the biological composition, which may then show marine and estuarine characteristics (Saad et al, 2002;Santangelo et al, 2007). Salinity is a key factor acting on the osmorregulation of individuals (Remane and Schlieper, 1971).…”

Section: Identification and Description Of The Main Threats Affectingmentioning

confidence: 99%

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Neotropical coastal lagoons: an appraisal of their biodiversity, functioning, threats and conservation management

et al. 2008

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Neotropical coastal lagoons (NCL) are human-dominated ecosystems. Their distribution along densely populated coastal areas of developing countries makes these systems among the most threatened in the world. Here, we summarize some aspects of the causes and consequences of NCL biodiversity, their functioning, their importance to the surrounding populations, their fragility, and their responses to local and global anthropogenic impacts and the challenges that Neotropical countries face in conserving these systems. Although still scarce and geographically concentrated, a growing body of studies has shown that NCLs are physiographically diversified systems, which harbor a considerable and particular proportion of the Neotropical inland aquatic biodiversity. Despite the fact that coastal lagoons are ecotones that are intricately connected to surrounding environments, they develop mechanisms for structural and functional regulation, which confer to these systems higher productivity and carrying capacities than surrounding ecosystems. Such traits attract residential developments and subsidize local traditional populations with important economic and aesthetic ecosystem revenues such as fisheries and scenic beauty. However, the disorganized human occupation around NCLs are causing profound impacts such as eutrophication, salinization, exotic species introduction, as well as other effects, which are ultimately imposing major habitat degradations and biodiversity extirpations in NCLs. We argue that interdisciplinary conservation strategies, which integrate scientific expertise, government officials, private companies and the general public, are the most likely to overcome the geographic and economic obstacles to NCL conservation.Keywords: coastal ecosystems, ecosystem management, shallow lakes, human impacts, tropical limnology.Lagoas costeiras neotropicais: Uma apreciação sobre sua biodiversidade, funcionamento, principais ameaças e estratégias de conservação ResumoAs lagoas costeiras neotropicais (LCN) estão inseridas em um ambiente antropogênico. Sua localização em regiões costeiras densamente povoadas de países em desenvolvimento coloca estes ecossistemas entre os mais impactados do mundo. Neste trabalho, resumimos vários aspectos relacionados às causas e conseqüências da sua biodiversidade, seu funcionamento e os bens proporcionados à população do seu entorno. Sua fragilidade e as respostas a impactos humanos locais e globais, assim como os desafios para a sua conservação por países neotropicais, também são abordados. Apesar de escassos e geograficamente concentrados, um número crescente de estudos tem mostrado que as LCN são sistemas fisiograficamente diversificados, abrigando uma proporção considerável da biodiversidade dos ambientes aquáticos continentais neotropicais. Apesar de as lagoas costeiras representarem ecótonos bastante conectados ao ambiente adjacente, elas desenvolveram mecanismos próprios de regulação funcional e estrutural, conferindo uma maior produtividade e capacidade de suporte em relação...

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Ecosystems

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Tropical Marine Ecology

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Zooplankton responses to sandbar opening in a tropical eutrophic coastal lagoon

Cited by 60 publications

References 27 publications

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

Neotropical coastal lagoons: an appraisal of their biodiversity, functioning, threats and conservation management

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