The continuity of living matter and the discontinuities of its constituents: do plankton and benthos really exist?

Boero, Ferdinando; Belmonte, Genuario; Fanelli, Giovanni; Piraino, Stefano; Rubino, Fernando

doi:10.1016/0169-5347(96)20007-2

Cited by 130 publications

(81 citation statements)

References 15 publications

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“…As far as egg-bank functioning is concerned (egg hatching in relation to vertical distribution and sediment conditions), there is a complete absence of studies on fairy shrimps, in contrast to the ample literature existing for other crustacean orders (UYE et al, 1979;MARCUS, 1984;MARCUS and SCHMIDT GEGENBACH, 1986;MORITZ, 1987;HAIRSTON and DE STASIO, 1988;CARVALHO and WOLF, 1989;DE STASIO, 1989WOLF and CARVALHO, 1989;MARCUS et al, 1994;HAIRSTON et al, 1995;LAMPERT, 1995;BOERO et al, 1996;CACERES, 1997CACERES, , 1998CACERES and HAIRSTON, 1998;COUSYN and DE MEESTER, 1998;ROSSI et al, 1998 and b).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…In planktonic organisms, hatching from resting eggs enables a multiple acceleration of population increase during the beginning of the development of a population with periodical re-establishment from this phase (Boero, 1994;Arbaciauskas and Gasiunaité, 1996), and is of great importance in explaining species fluctuations in space and time (Giangrande et al, 1994) and benthic-pelagic coupling (Boero et al, 1996;Marcus and Boero, 1998). Moreover, these resting eggs can remain viable for long time, which exceeds the individual life span of species by a noticeable amount.…”

Section: Resumen: Primeras Evidencias De Huevos De Resistencia De Acamentioning

confidence: 99%

First evidences of <i>Acartia bifilosa</i> resting eggs in sediments of the Urdaibai estuary (Bay of Biscay): abundance and hatching success

Uriarte¹,

Villate²

2006

Sci. Mar.

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“…Life cycles should be much more relevant in ecological papers, but these are mostly onestage oriented (in fact only a small percentage of ecological papers consider life cycles) in spite of ecology being labelled as the science of connections and interactions. Most hydroidomedusae have complex life cycles, and the existence of polyps is dictated by the success of the medusae and vice versa, this being relevant to ecological approaches (see Boero et al, 1996 for a discussion of the importance of life cycles in marine ecology).…”

Section: Discussionmentioning

confidence: 99%

Trends in hydroidomedusan research from 1911 to 1997

et al. 2000

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SUMMARY: The papers on hydroidomedusae published from 1911 to 1997 total 10,934. They have been assigned to the following categories: faunistics and systematics; sub-organismal biology; ecology; evolution; life cycles; paleontology. The general trend, comprising all papers, can be divided into four time intervals: the first with an average of sixty papers/year and with a slight decrease due to First World War; the second one (1940)(1941)(1942)(1943)(1944)(1945)(1946)(1947), with an average of 38 papers/year, marked by a dramatic decrease coinciding with Second World War; the period 1948-1991 shows a steady increase until the mid-Seventies, when a small decrease occurred, followed by an increasing trend reaching its apex in the late Eighties-early Ninenties with a record of 296 papers in 1991 and with an average of 175 papers/year; the period 1992-1997, with an average of 178 papers/year, is marked by a sharp decrease, reaching the values of the mid Sixties. The most important category in terms of number of papers is sub-organismal biology, followed by faunistics and systematics. Systematic studies dictated the trend in the first decades of the century, whereas sub-organismal ones are prevalent from the Sixties onwards. Faunistic and systematic-taxonomic papers have a steady trend of production, with just a slight decrease over these last years. The formerly leading countries in systematics (UK, USA, France) are now almost inactive in this discipline, whereas countries with little or no tradition in this field (such as Spain) are taking the leadership.

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The continuity of living matter and the discontinuities of its constituents: do plankton and benthos really exist?

Cited by 130 publications

References 15 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

First evidences of <i>Acartia bifilosa</i> resting eggs in sediments of the Urdaibai estuary (Bay of Biscay): abundance and hatching success

Trends in hydroidomedusan research from 1911 to 1997

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