Ecology of Pelmatohydra oligactis in Kirkpatricks Lake, Tennessee

Bryden, Robert R.

doi:10.2307/1948528

Cited by 27 publications

(16 citation statements)

References 23 publications

(82 reference statements)

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“…On the other hand, Hyman (1928) and Bryden (1952) viewed the retention of multiple buds in Hydra oligactis as the result of slowed rates of bud detachment when the rate of budding decreased.…”

Section: Discussionmentioning

confidence: 99%

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Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Cuker

Mozley

1981

Limnology & Oceanography

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Section: Discussionmentioning

confidence: 99%

“…But ecological studies of field populations are few and have been conducted in temperate lakes (Batha 1974;Bryden 1952;Griffing 1965;Miller 1936;Welch and Loomis 1924). When we found Hydra in substantial densities in Toolik Lake, Alaska, we undertook a detailed population study.…”

mentioning

confidence: 99%

Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Cuker

Mozley

1981

Limnology & Oceanography

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“…Several factors influence the distribution and abundance of Hydra (e.g. food, depth, and temperature), but support structures are considered to be one of the most important (Bryden 1952). The dense populations of this cnidarian in the lake are strongly related to the high abundance of the introduced macrophyte, the Eurasian watermilfoil, A4.…”

Section: Discussionmentioning

confidence: 99%

Predation by Hydra on larval fish: Field and laboratory experiments with bluegill (Lepomis macrochirus)

Elliott

Leggitt

1997

Limnology & Oceanography

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We found high population densities of Hydra canadensis (up to 30,000 m ') on macrophytes in Lake Opinicon (Ontario, Canada) and tested whether they influenced the survival of larval bluegill, Lepomis macrochirus. Hydra were observed to capture and ingest bluegill larvae in laboratory trials, IndiAduals that ingested fish larvae turned black; those fed a variety of crustacean species remained brown. The ingestion rate of Hydra on larvae in 8-liter laboratory microcosms was higher during the night (0.197 larvae predator-l h-l) than during the day (0.111 larvae predator-l h-l), Many larvae also died after escaping from the stinging tentacles of Hydra (on average 26% of larval mortality). Population densities of Hydra were highest on the macrophyte Myriophyllum spicatum. Bluegill colonies were surrounded by dense beds of M. spicatum in some areas, and larvae in the colonies had to swim through the plants (with the attached Hydra) in order to reach open water. We sampled Hydra in the vicinity of bluegill colonies on the morning after larval swim-up. The number of black Hydra decreased with increasing distance from a colony; 72% black within colonies, 45% at 0.5 m outside colonies, and 31% at 2 m outside of colonies. We estimate that up to 20% of the larvae produced by a colony csn be killed by Hydra within this 2-m zone. Many more larvae likely die as a result of encounters with Hydra that are abundant throughout the lake.

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“…Abundances of all of the common chironomid genera differed between the small grids (Wilcoxon Rank Sum Test, p<0.05) (Figure 3). Many previous studies in natural aquatic systems have shown strong associations between plant and invertebrate communities (Krecker 1939, Edmondson 1944, Bryden 1952, Rosine 1955, Smyly 1957, Macan 1965, McLachlan 1969, Calow 1973, Grifliths 1973, Pip and Stewart 1976, Pip 1978, Murkin and Kadlec 1986, Henson 1988, Wrubleski and Rosenberg 1990. However, most of these studies relied on collection of invertebrates directly from plants.…”

Section: Study Site and Methodsmentioning

confidence: 99%

“…In natural aquatic ecosystems, invertebrate community spatial patterns are generally related to the distribution of plant communities. Distributions of rotifers (Edmondson 1944), hydrozoans (Bryden 1952), entomostracan crustaceans (Smyly 1957), gastropod molluscs (Calow 1973, Pip and Stewart 1976, Pip 1978, and various insects (Krecker 1939, Rosine 1955, Macan 1965, McLachlan 1969, Griffiths 1973, Henson 1988, Murkin and Kadlec 1986, Wrubleski and Rosenberg 1990 have been correlated with plant distributions in lake littoral zones, ponds, streams, and marshes. This study examines associations between chironomid (Diptera) genera and vegetation communities in a created freshwater herbaceous wetland in central Florida.…”

Section: Introductionmentioning

confidence: 99%

Chironomidae (Diptera) and vegetation in a created wetland and implications for sampling

et al. 1995

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Although invertebrate communities are used in the evaluation of created freshwater wetlands, spatial patterns of invertebrate community structure are frequently ignored. Invertebrate distributions are generally associated with plant community distribution in natural aquatic ecosystems. In this study, 180 core samples were collected to examine associations between chironomid (Diptera) genera and emergent vegetation communities in a single created freshwater herbaceous wetland in central Florida. Three of the five common genera were significantAy more abundant (p <0.05, Wilcoxon Rank Sum Test) in areas with greater than 50% cover by emergent vegetation than in open water, but no differences were found between areas dominated by Pontederia cordata and areas dominated by mixed emergent vegetation. Samples from an area of open water and an area with over 80% cover by P. cordata showed significant differences in abundances of all common chironomid genera (P<0.05, Wilcoxon Rank Sum Test). Results suggest that sampling designs for studies comparing benthic invertebrate communities from natural and created wetlands should consider the possible associations between vegetation and invertebrate communities.

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Ecology of Pelmatohydra oligactis in Kirkpatricks Lake, Tennessee

Cited by 27 publications

References 23 publications

Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Predation by Hydra on larval fish: Field and laboratory experiments with bluegill (Lepomis macrochirus)

Chironomidae (Diptera) and vegetation in a created wetland and implications for sampling

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