1990
DOI: 10.1139/z90-065
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Seasonal cycles of activity and inactivity in some hydroids from Virginia and South Carolina, U.S.A.

Abstract: Hydroids investigated in estuaries of Virginia and South Carolina, USA, were characteristically seasonal in occurrence. Of 20 species studied in Virginia, 14 were active only during warmer months and 6 only during colder months of the year. Seven of the 18 species examined in South Carolina were active all year, whereas 9 were active only in warmer months and 2 only during colder months. Reflecting the differing temperature regimes of the two study areas, warm-water species were active for a longer period of t… Show more

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Cited by 68 publications
(52 citation statements)
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“…This small number of species contrasts with that recorded on panels in the São Sebastião Channel, state of São Paulo, where MIGOTTO et al (2001) collected 22 species. This number corresponds to about 1 / 3 of the species recorded in the natural environment (VANNUCCI, 1956;SILVEIRA & MIGOTTO, 1984;MARQUES, 1993;MIGOTTO, 1996), as previously observed by other researchers in different parts of the world (MILLARD, 1959;CALDER, 1990).…”
Section: Resultssupporting
confidence: 81%
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“…This small number of species contrasts with that recorded on panels in the São Sebastião Channel, state of São Paulo, where MIGOTTO et al (2001) collected 22 species. This number corresponds to about 1 / 3 of the species recorded in the natural environment (VANNUCCI, 1956;SILVEIRA & MIGOTTO, 1984;MARQUES, 1993;MIGOTTO, 1996), as previously observed by other researchers in different parts of the world (MILLARD, 1959;CALDER, 1990).…”
Section: Resultssupporting
confidence: 81%
“…If this hypothesis is valid, the species may effectively inhibit competing organisms. But one must also consider the possibility of not finding some species during their seasonal ''resting periods '' (CALDER, 1990), considering that the collections were made only from August 2004 through January 2005.…”
Section: Resultsmentioning
confidence: 99%
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“…It is also common to see some hydroids that develop into relatively large and robust colonies, which can then resist settlement and overgrowth by other sessile invertebrates, such as sponges, tunicates, and bryozoans (Migotto et al, 2001). Seasonal variation in abundance of hydroids has been associated with activity-quiescence cycles (Bavestrello et al, 2006), recruitment (Migotto et al, 2001), and reproduction (Gili and Hughes, 1995), and fluctuations often follow sudden changes in sea surface temperature (Calder, 1990;Migotto et al, 2001). Most studies on cnidarian seasonality have focused on one or few common species (Bavestrello et al, 2006;Calder, 1990;Migotto et al, 2001), while temporal variation in assemblage structure, including richness and relative commonness and rarity in time and space has not been amply reported.…”
Section: Introductionmentioning
confidence: 99%
“…Seasonal changes in water temperature control reproductive timing in shallow-water coastal hydroids of the mid-SEUS (Calder, 1990), but temperature variability on the SEUS deep-water coral habitats is not well known. Alternatively, reproductive timing may track variation in other environmental factors, such as food supply.…”
mentioning
confidence: 99%