Seed Bank Dynamics and Coexistence of Annual Macrophytes in a Temporary and Variable Habitat

Bonis, Anne; Lepart, Jacques; Grillas, Patrick

doi:10.2307/3545677

Cited by 144 publications

(108 citation statements)

References 37 publications

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“…Variability in hatching response of anostracan resting eggs was noted even in the earliest studies and it is currently interpreted as an expression of the buffering capacity of egg banks against environmental variability, in the same way as has been documented for seed banks (KALISZ and MC PEEK, 1993;BONIS et al, 1995). The spreading of risk of demographic catastrophe by delayed hatching of a part of the anostracan egg bank (especially important in highly unpredictable environments) was recently demonstrated by a number of field studies on fairy shrimps from arid or tropical climates (HILDREW, 1985;GALLAGHER, 1996;SIMO-VICH and HATHAWAY, 1997;.…”

Section: Hatching Phenologymentioning

confidence: 84%

Structure and Functioning of the “Egg Bank” of a Fairy Shrimp in a Temporary Pool: Chirocephalus ruffoi from Pollino National Park (Southern Italy) as a Case Study

Mura

2004

International Review of Hydrobiology

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To investigate their distribution and total numbers, resting eggs of the anostracan Chirocephalus ruffoi were collected from the bed of a temporary pool in southern Italy. Samples were taken at 0.5 m intervals along six transects oriented at 30°from each other, by means of a cylindrical core sampler. The horizontal distribution of intact resting eggs was extremely patchy, with cyst number per core ranging from 191 to 1,400 (CV = 32.7%), corresponding to a mean of between 0.8 and 4.3 cysts cm -3 . Differences observed were related to core position and transect orientation, total cyst numbers being markedly higher in the leeward area of the pool compared to the windward area. Marked variation was also evident in vertical distribution, a significant, though weak correlation was recorded between egg density and sediment depth. Cyst-bank size (± 95% confidence limits) of the pool bed, estimated from the mean cyst number cm -3 obtained for the 6 transects, ranged between 1.0 × 10 8 and 1.3 × 10 8 cysts.Hatching in the laboratory was very erratic. Despite significant differences in hatching, the observed variation was unrelated to most of the variables considered (position within sections, cores and transects, pre-incubation treatment) and was explained only by initial sediment conditions (moist/dry). In none of the experimental conditions tested was synchronous hatching obtained.Possible causal factors (mixing of the bottom sediments by cattle, egg age, storage conditions, differential exposure to environmental cues as well as variability in hatching response even at clutch level) are discussed. IntroductionMany residents of temporary pools produce long-lived resting eggs enabling survival during unfavourable conditions. The changing nature of these habitats requires adaptation to very different environmental regimes. Moreover, the predictability and the frequency of the wet/dry phases vary greatly among habitats, depending on factors like climate, latitude, altitude, nature of the sediment etc. Therefore population persistence requires local adaptations in life history traits and, particularly in the hatching behaviour of the resting stages (BELK and COLE, 1975;WIGGINS et al., 1980). The more unpredictable the local habitat, the higher the risk of extinction favouring the evolution of adaptations that "spread the risk" (see review in SIMOVICH and HATHAWAY, 1997;BRENDONCK et al., 1998). Not all of the eggs deposited at one time will hatch during the same subsequent inundation and thus an egg bank (sensu DE STASIO, 1989) forms in the sediment, acting as a reserve for the future. In addition to information about quantitative reproductive characteristics, understanding the behaviour and functioning of an egg bank is of fundamental importance in identifying any local adaptations to habitat uncertainty.Internat. Rev. Hydrobiol.

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Section: Hatching Phenologymentioning

confidence: 84%

Structure and Functioning of the “Egg Bank” of a Fairy Shrimp in a Temporary Pool: Chirocephalus ruffoi from Pollino National Park (Southern Italy) as a Case Study

Mura

2004

International Review of Hydrobiology

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“…After submersion of the sediment, Chara spp. may germinate rapidly from seed banks and become dominant in lakes (Bonis et al, 1995). For Nuphar lutea, in contrast, several years without drawdown are needed to allow establishment in lakes, due to the high vulnerability of both seeds and juvenile plants to desiccation (Smits et al, 1989).…”

Section: Discussionmentioning

confidence: 99%

Water-level fluctuations affect macrophyte richness in floodplain lakes

et al. 2005

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The characteristic ecology of floodplain lakes is in part due to their relatively strong water-level fluctuations. We analyzed the factors determining water-level fluctuations in 100 floodplain lakes (during nonflooded conditions) in the active floodplains of the Lower Rhine in the Netherlands. Furthermore, we explored the relationship between water-level fluctuations and macrophyte species richness, and analyzed the suitability of artificially created lakes for macrophyte vegetation. During non-flooded conditions along the Rhine, lake water-level fluctuations are largely driven by groundwater connection to the river. Hence, water-level fluctuations are largest in lakes close to the main channel in strongly fluctuating sectors of the river and smallest in isolated lakes. Additionally, water-level fluctuations are usually small in old lakes, mainly due to reduced groundwater hydraulic conductivity resulting from accumulated clay and silt on the bottom. Species richness of floating-leaved and emergent macrophytes was reduced at both small and large water-level fluctuations, whereas species richness of submerged macrophytes was reduced at small waterlevel fluctuations only. In addition, species richness of submerged macrophytes was higher in lakes that experienced drawdown, whereas no similar pattern was detected for floating-leaved and emergent macrophytes. The decline in amplitude of lake water-level with lake age implies that the number of hydrologically dynamic lakes will decrease over time. Therefore, we suggest that excavation of new lakes is essential to conserve the successional sequence of floodplain water bodies including conditions of high biodiversity. Shallow, moderately isolated, lakes with occasional bottom exposure have the highest potential for creating macrophyte-rich floodplain lakes along large lowland rivers. The water-level regime of such lakes can in part be designed, through choice of the location along the river, the distance away from the river and the depth profile of the lake.

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“…The recruitment and the density of annual species are determined by the variation of the hydrologic conditions, which allow the plants in the environment to be established and regenerated. (Bonis et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Hydrologic cycle and dynamics of aquatic macrophytes in two intermittent rivers of the semi-arid region of Brazil

2006

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The dynamics of aquatic macrophytes in intermittent rivers is generally related to the characteristics of the resistance and resilience of plants to hydrologic disturbances of flood and drought. In the semi-arid region of Brazil, intermittent rivers and streams are affected by disturbances with variable intensity, frequency, and duration throughout their hydrologic cycles. The aim of the present study is to determine the occurrence and variation of biomass of aquatic macrophyte species in two intermittent rivers of distinct hydrologic regimes. Their dynamics were determined with respect to resistance and resilience responses of macrophytes to flood and drought events by estimating the variation of biomass and productivity throughout two hydrologic cycles. Twenty-one visits were undertaken in the rewetting, drying, and drought phases in a permanent puddle in the Avelós stream and two temporary puddles in the Taperoá river, state of Paraíba, Northeast Brazil. The sampling was carried out by using the square method. Floods of different magnitudes occurred during the present study in the river and in the stream. The results showed that floods and droughts are determining factors in the occurrence of macrophytes and in the structure of their aquatic communities. The species richness of the aquatic macrophyte communities was lower in the puddles of the river and stream subject to flood events, when compared to areas where the runoff water is retained. At the beginning of the recolonization process, the intensity of the floods was decisive in the productivity and biomass of the aquatic macrophytes in the Taperoá river and the Avelós stream. In intermediate levels of disturbance, the largest values of productivity and biomass and the shortest time for starting the recolonization process occurred.Keywords: stream, disturbance, flood, drought, aquatic macrophyte. RESUMO Ciclo hidrológico e dinâmica de macrófitas aquáticas em dois rios intermitentes da região semi-árida do BrasilA dinâmica de macrófitas aquáticas em rios intermitentes está relacionada com as características de resistência e resiliência das plantas as perturbações hidrológicas da cheia e da seca. A região semi-árida do Brasil apresenta rios e riachos intermitentes, com ocorrência de eventos de perturbação em diferentes graus de intensidade, freqüência e duração ao longo de um ciclo hidrológico. O objetivo deste estudo foi determinar a ocorrência e variação de biomassa de espécies de macrófitas aquáticas em dois rios intermitentes de regime hidrológico distintos. A dinâmica foi determinada pelas respostas de resistência e resiliência das plantas aos eventos de cheia e de seca, através da variação da biomassa e produtividade ao longo de dois ciclos hidrológicos. Foram realizadas 21 visitas de campo durante as fases de reinundação, 576 PEDRO, F., MALTCHIk, L. and BIANCHINI JR., I.

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Seed Bank Dynamics and Coexistence of Annual Macrophytes in a Temporary and Variable Habitat

Cited by 144 publications

References 37 publications

Structure and Functioning of the “Egg Bank” of a Fairy Shrimp in a Temporary Pool: Chirocephalus ruffoi from Pollino National Park (Southern Italy) as a Case Study

Structure and Functioning of the “Egg Bank” of a Fairy Shrimp in a Temporary Pool: Chirocephalus ruffoi from Pollino National Park (Southern Italy) as a Case Study

Water-level fluctuations affect macrophyte richness in floodplain lakes

Hydrologic cycle and dynamics of aquatic macrophytes in two intermittent rivers of the semi-arid region of Brazil

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