The circatidal clock of an estuarine semi-terrestrial crab, Sesarma erythrodactylum

Saigusa, Masahiro

doi:10.5179/benthos1996.52.1_21

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…Influence of the tide Well-demarcated tidal rhythms are often found in intertidal and estuarine organisms (Enright 1972;Saigusa 1982Saigusa , 1992Saigusa , 1997bSaigusa & Akiyama 1995;Saigusa & Kawagoye 1997). However, the present study demonstrated that very few groups showed a clear tidal rhythm (level T 3 ) in the subtidal zones.…”

Section: Variation Of Synchrony With Day/night and Tidal Cyclescontrasting

confidence: 72%

Daily rhythms of emergence of small invertebrates inhabiting shallow subtidal zones: A comparative investigation at four locations in Japan

Saigusa

2001

Ecological Research

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Many small invertebrates inhabit the shallow subtidal zone and some of them emerge at times into the water column. The daily timing of their emergence is affected by the day/night and tidal cycles, and shows various patterns of synchrony with these cyclical factors, depending on the species. To detect possible regional differences in their emergence patterns, sampling was carried out at four locations in Japan: a boreal sea (Akkeshi), a temperate sea (Sugashima), an inland sea (Ushimado) and a subtropical sea (Iriomote‐jima). The emergence patterns of major taxa were examined by visual inspection and by two statistical methods (periodogram and autocorrelogram). The composition of the taxa collected by the pump system, mostly crustaceans, was similar in each location. The number of ‘taxa’ that emerged revealed a day/night rhythm in every location. This characteristic was clearest at Iriomote‐jima and least clear at Sugashima. The daily fluctuation in the number of individuals in each taxon varied widely, from very clearly nocturnal to weakly diurnal patterns. In Iriomote‐jima, the major taxa all showed well‐demarcated nocturnal patterns, so these patterns were classified as either level N2 or N3 with regard to the degree of synchrony with the day/night cycle. With regard to the synchrony with the tide, the majority of patterns in all locations showed a ‘double‐tidal interval’. Many patterns were slightly modified by the tidal cycle. These patterns were classified as level T1 or T2 with regard to the degree of synchrony with the tidal cycle. The synchrony with the tide was comparatively strong at Ushimado. The synchrony with day/night and tidal cycles varied even within the same species or closely related species. In benthic invertebrates, hiding or resting in the bottom substrates and swimming in the water column would occur alternatively. In planktonic animals, aggregation near the bottom and dispersal in the water column would occur alternatively. The daily timing of such activities may be synchronized with the day/night and tidal cycles to various degrees among species or populations, resulting in a wide variety of emergence patterns in subtidal small invertebrates. This type of behavior is not ‘daily (diel) vertical migration’; it should rather be called ‘daily emergence/dispersal’. Strong winds, rough waves and unknown seasonal factors would also affect emergence patterns. Furthermore, the transparency of the seawater may also strongly affect these patterns. Nocturnal patterns may be an adaptation to avoid vulnerability to sighted predators. Variation of synchrony with the tide indicates that by definition, the tidal rhythm can only be distinguished from the day/night rhythm. Hence, the daily patterns that are weakly modified by the tides (levels T1 and T2) should be called the tidal rhythms. As the period of such rhythms cannot be determined exactly by using statistical methods, lengthy field investigations and visual inspection of each pattern is essential to assess the influence of tides.

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Section: Variation Of Synchrony With Day/night and Tidal Cyclescontrasting

confidence: 72%

Daily rhythms of emergence of small invertebrates inhabiting shallow subtidal zones: A comparative investigation at four locations in Japan

Saigusa

2001

Ecological Research

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“…In Japan, Saigusa (1981) and his coworkers have studied patterns of larval release by species in relation to ecological distribution. In the terrestrial crab Sesarma erythrodactylum, release of larvae is synchronized with either of the two tides but more commonly with the nocturnal high tide demonstrating a rhythm of 24.8 h (Saigusa, 1997a). On the other hand, release of larvae by the semiterrestrial crab S. pictum (Saigusa, 1992) and the intertidal crab Hemigrapsus sanguineus (Saigusa & Kawagoye, 1997) is coincident with both tides showing a periodicity of 12.4 h. Another species, S. hematocheir is found over a wide range of habitats around Japan (Saigusa, 1985).…”

Section: Larval Release Rhythmsmentioning

confidence: 98%

Unravelling the Ecological Significance of Endogenous Rhythms in Intertidal Crabs

Thurman

2004

Biological Rhythm Research

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“…The larval release activity of some crabs (Sesarma haematocheir and S. erythrodactylum) is synchronized with the nocturnal high tide, so the period of the rhythm is a doubletidal interval (e.g., see Saigusa, 1982). The 24-hr light/dark (LD) cycles caused a phase-shift of the tidal rhythm (Saigusa, 1988(Saigusa, , 1997a. A notable feature was that the magnitude of the phase-shift clearly 'corresponded' to that of the phaseshift in the LD cycle.…”

Section: The Tidal Rhythm As a Variation Of The Day/night Rhythmmentioning

confidence: 99%

“…Accordingly, a hypothesis proposed was that the activity is organized by two kinds of different timing, i.e., circadian and circatidal rhythms (e.g., Naylor, 1958Naylor, , 1996Palmer and Round, 1967;Reid and Naylor, 1989;Palmer, 1995). An opposing notion is that the day/night cycle is one of the zeitgebers of the tidal rhythm (Saigusa, 1988(Saigusa, , 1992(Saigusa, , 1997aSaigusa and Kawagoye, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…The tidal cycle recurs at intervals of 12.4 hr in the mean, so the period of some tidal rhythms is about 12.4 hr: a single-tidal interval. On the other hand, the period is often about 24.8 hr (a double-tidal interval), when the activity occurs either in the daytime or at night (e.g., Saigusa, 1982Saigusa, ,1997aNeumann, 1987), or when it is correlated with the fluctuations of the height of semidiurnal tides (e.g., Enright, 1972;Saigusa and Kawagoye, 1997). Since there is clear evidence that synchrony with the tidal cycle is changeable between the single-tidal interval (12.4 hr) and the double-tidal interval (24.8 hr) (see Saigusa and Akiyama, 1995), it is not reasonable to define a new term such as 'circalunidian' for the double-tidal interval (e.g., Palmer, 1995;Naylor, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Emergence Rhythms of Subtidal Small Invertebrates in the Subtropical Sea: Nocturnal Patterns and Variety in the Synchrony with Tidal and Lunar Cycles

Saigusa

Oishi

2000

Zoological Science

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The circatidal clock of an estuarine semi-terrestrial crab, Sesarma erythrodactylum

Cited by 9 publications

References 32 publications

Daily rhythms of emergence of small invertebrates inhabiting shallow subtidal zones: A comparative investigation at four locations in Japan

Daily rhythms of emergence of small invertebrates inhabiting shallow subtidal zones: A comparative investigation at four locations in Japan

Unravelling the Ecological Significance of Endogenous Rhythms in Intertidal Crabs

Emergence Rhythms of Subtidal Small Invertebrates in the Subtropical Sea: Nocturnal Patterns and Variety in the Synchrony with Tidal and Lunar Cycles

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