Biotic adaptations in temporary lentic waters, with special reference to those in semi-arid and arid regions

Williams, W. D.

doi:10.1007/978-94-009-5522-6_7

Cited by 61 publications

(92 citation statements)

References 107 publications

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“…The desert ephemeral pools examined in this study have diurnal cycles that are similar to those reported for other temporary freshwater systems (see Williams, 1985 ;Dejours, 1975 for reviews) . However, the hyperoxic and hypocapnic conditions measured during the day and the hypoxic and hypercapnic states during the night were not as severe as those reported for intertidal rockpools by Truchot and Duhamel-Jouve (1980) .…”

Section: Discussionsupporting

confidence: 62%

“…Overall, changes in osmotic pressure for the four pools averaged less than 10 mOsmol . This corresponds to previous suggestions that evaporation would not significantly increase total salt content of freshwater ephemeral pools due to low initial salt concentrations (Horne, 1967 ;Williams, 1985) . Therefore, large fluctuations in salinity do not appear to be an important component in these systems .…”

Section: Seasonal Fluctuationsmentioning

confidence: 88%

“…While many authors have suggested different adaptations to temporary water habitats (see Williams, 1985 for a review), the physiological effects have been largely ignored . Truchot (1986) found that fluctuations in oxygen and carbon dioxide in intertidal rock pools had opposing affects on the acid-base status of the shore crab Carcinus maenas .…”

Section: Discussionmentioning

confidence: 99%

“…Truchot and DuhamelJouve (1980) measured increases in oxygen to over 400 torr during the day and up to 3 torr increases in carbon dioxide during the night for intertidal rock pools . In addition, small bodies of water may undergo large and rapid fluctuations in temperature and increases in osmotic variables dependent on pool size and climactic conditions (see Williams 1985 for a review) . Williams (1985) pointed out that in spite of the relative ubiquity of temporary waters, little is known about the functional dynamics of these systems .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, small bodies of water may undergo large and rapid fluctuations in temperature and increases in osmotic variables dependent on pool size and climactic conditions (see Williams 1985 for a review) . Williams (1985) pointed out that in spite of the relative ubiquity of temporary waters, little is known about the functional dynamics of these systems . This seems especially true for desert ephemeral pools where rapid changes, both diurnally and seasonally (from initial pool filling to final evaporation), may be important .…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variation and diurnal fluctuations in ephemeral desert pools

Scholnick

1994

Hydrobiologia

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The physical variables which directly affect organisms inhabiting desert ephemeral pools were examined in four pools in southeastern Utah . During the day, pools were hyperoxic (240 torr) and hypocapnic (0 .07 ton) while pH and temperature increased (7 .5-9 .0 & 17-35 °C respectively) . Conversely, predawn pool measurements were hypoxic (40 torr) and hypercapnic (3 torr) . While TA increased throughout the season (from 0 .4 to 1 .43 meq 1-1 ), due largely to increased bicarbonate concentration (from 0 .5 to 1 .4 mmol 1 -1 ), water osmolarity remained relatively constant . These desert ephemeral systems represent unique environmental habitats where organisms experience both diurnal and seasonal changes in numerous physical variables over short time frames .

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Section: Discussionsupporting

confidence: 62%

Section: Seasonal Fluctuationsmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seasonal variation and diurnal fluctuations in ephemeral desert pools

Scholnick

1994

Hydrobiologia

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Plankton Succession in the Temporary Lake Koronia after Intermittent Dry‐Out

Michaloudi

Moustaka‐Gouni

Pantelidakis

et al. 2012

International Review of Hydrobiology

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This study examines the plankton succession in a polluted temporary lake after intermittent dry‐out. The initial stage after flooding was heterotrophic (zooplankton/phytoplankton carbon biomass ratio > 1). Phytoplankton species richness increased exponentially within a few months after inundation. The chlorophyte Koliella cf. longiseta was the pioneer colonist which was replaced by Oocystis sp. reaching 300 340 ind mL–1. The initial conditions favored rotifer and cladoceran colonists, not previously recorded, to successfully establish populations. The species that finally became dominant hatched from the lake's sedimentary egg bank with Daphnia magna being prominent. Nevertheless, the zooplankton community was unable to control the high biomass of chlorophytes (zooplankton/phytoplankton carbon biomass ratio < 0.4). Plankton succession in this temporary lake was mostly determined by the past phytoplankton – zooplankton species pool rather than by the established new colonists. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Macrophyte diversity and physico-chemical characteristics of Tyrrhenian coast ponds in central Italy: implications for conservation

Bella¹,

Bazzanti²,

Dowgiallo³

et al. 2007

Pond Conservation in Europe

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Awareness of pond conservation value is growing all over Europe. Ponds are recognized as important ecosystems supporting large numbers of species and several rare and threatened aquatic plants, macroinvertebrates and amphibians. Notwithstanding ponds, particularly temporary ones, are still neglected in Italy. There are some gaps in our understanding of the macrophyte ecology and the conservation value of Mediterranean small still waters. Therefore, this study investigated the macrophyte communities and physico-chemical characteristics of 8 permanent and 13 temporary ponds along the Tyrrhenian coast near Rome, with the aim to relate the distribution of aquatic plants to environmental variables, and to define the botanical conservation value of ponds.Throughout the study period (Spring 2002), Principal Component Analysis performed on abiotic variables clearly discriminated temporary ponds, smaller and more eutrophic, from permanent ponds, larger and with higher pH and oxygen concentration. A total of 73 macrophyte taxa were collected in the study ponds. Temporary waters hosted a smaller number of plant species than permanent ones. Besides hydroperiod length, the environmental factors related to plant richness were maximum depth, surface area, dissolved oxygen and nitrogen concentration in the water. Moreover, the Non-metric Multidimensional Scaling showed a high dissimilarity in the taxonomic composition of aquatic plants between temporary and permanent ponds. The former contained more annual fast-growing species (Callitriche sp. pl. and Ranunculus sp. pl.), while in the latter species with long life-cycles (i.e. Potamogeton sp. pl.) were more abundant. Our results highlighted that temporary and permanent ponds in central Italy have different macrophyte assemblages, with aquatic species (including some of conservation interest at regional scale) exclusively found in each pond type. This suggested that both type of ponds could give an irreplaceable contribution to the conservation of aquatic plant diversity of these freshwater ecosystems.

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Biotic adaptations in temporary lentic waters, with special reference to those in semi-arid and arid regions

Cited by 61 publications

References 107 publications

Seasonal variation and diurnal fluctuations in ephemeral desert pools

Seasonal variation and diurnal fluctuations in ephemeral desert pools

Plankton Succession in the Temporary Lake Koronia after Intermittent Dry‐Out

Macrophyte diversity and physico-chemical characteristics of Tyrrhenian coast ponds in central Italy: implications for conservation

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