Differences in low pH tolerance among closely related sunfish of the genus Enneacanthus

Gonzalez, Richard J.; Dunson, William A.

doi:10.1007/bf00002467

Cited by 21 publications

(19 citation statements)

References 18 publications

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“…Abiotic factors, such as pH, and biotic factors, such as competition, may also interact to yield patterns not predicted from responses to either set of factors alone (Tansley 1917, Park 1954, Jaeger 1971, Gonzalez and Dunson 1989, Warner et al 1991, 1993. listed as an endangered species in New Jersey (Gosner and Black 1957, Freda and Dunson 1986, Conant and Collins 1992.…”

Section: Introductionmentioning

confidence: 99%

Competition, pH, and the Ecology of Larval Hyla Andersonii

Pehek¹

1995

Ecology

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I investigated the effects of an abiotic factor, pH, and a biotic factor, interspecific competition, on breeding success in a low—pH tolerant anuran, Hyla andersonii. I tested whether low pH would indirectly facilitate H. andersonii by lessening the impact of competition from two less acid—tolerant species. I also tested whether the competitive effect of an allotopic, closely related species (Hyla versicolor) would be greater than that of a syntopic, more distantly related species (Rana sphenocephala). I exposed H. andersonii tadpoles to two levels of pH (3.9, ambient) and three levels of competition (H. versicolor, R. sphenocephala, and none). Reduced pH had no direct effect on any of the species and did not influence the outcome of interspecific competition. from R. sphenocephala decreased survival and mass of H. andersonii, whereas competition from H. versicolor only decreased mass, without affecting survival of H. andersonii. These results suggest that some other correlate of low pH in natural ponds limits H. andersonii to acidic ponds. Further, the assumptions that co—occurrence or level of relatedness can be used as a gauge of competitive strength are shown to be unreliable.

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Section: Introductionmentioning

confidence: 99%

Competition, pH, and the Ecology of Larval Hyla Andersonii

Pehek¹

1995

Ecology

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“…Bluespotted sunfish occurred in 27 sites, 77.8% of which were oxbow side-ponds that had reduced pH, higher SAV and EAV coverage, and were less conductive and turbid than the data would indicate when all oxbow side-ponds were combined (Table 3). Lee and Gilbert (1980), Graham and Hastings (1984) and Gonzalez and Dunson (1989) noted that bluespotted sunfish typically inhabit backwater sloughs/bogs which are reduced velocity, highly vegetated and acidic. Bluespotted sunfish in Florida occupied shallow water habitats containing dense vegetation (Fox 1969).…”

Section: General Distributionmentioning

confidence: 99%

“…gloriosus was high and vice versa. Members of the genus Enneacanthus are adapted to acidic habitats, with bluespotted sunfish populations spanning pH 4.1 to 7.0 (Graham and Hastings 1984) but exhibit reduced growth in pH 4.0 and 4.25 compared to pH 4.5, 5.0 and 5.8 (Gonzalez and Dunson 1989).…”

Section: General Distributionmentioning

confidence: 99%

“…For example, Graham and Hastings (1 984) and Gonzalez and Dunson (1989) reported that bluespotted sunfish prefer water where pH ranged belween 4.1 and 7.0. Bluespotted sunfish are found over muddy or sandy bottoms, reach sizes approaching 78 mm standard length (SL) (Lee and Gilbert 1980), spawn between April and October in the south (McLane 1955, Hellier 1967, Fox 1969, and produce sticky eggs which are attached to vegetation (Breder andRedmond 1929, Fletcher 1962).…”

Section: Introductionmentioning

confidence: 99%

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Distribution, Habitat Characterization, and Aspects of Reproduction of a Peripheral Population of Bluespotted SunfishEnneacanthus gloriosus(Holbrook)

Peterson

VanderKooy

1997

Journal of Freshwater Ecology

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The bluespotted sunfish is native to coastal plain drainages from southeastern New York to Old Ft. Bayou, Mississippi. Little is known about its ecology throughout much of its natural range and particularly at its distribution periphery. We quantified 1 1 parameters from bluespotted sunfish habitat in 97 sites across coastal Mississippi during July 1993 and 1994 and August 1995, and then characterized it using principal components analysis. Bluespotted sunfish prcferred oxbow side-ponds where 91.2% of the 523 individuals were collected. Oxbow side-ponds were characterized by fine substratum, abundant % submersed and emergent vegetation, and slightly acidic waters with high conductivity and low turbidity and velocity. Bluespotted sunfish in coastal Mississippi were smaller (maximum size 44.5 mm SL) and matured at a smaller size (15-18 mm SL) than bluespotted sunfish reported from east-coast populations, which is not atypical of species that have large geographic rangcs. Males matured earlier than females, and 50% maturity occurred between 18-1 Y mm SL.

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“…Sodium regulation was unaffected until pH dropped below 4.5, and fish could survive for up to 12 weeks at pH 4.0 (Gonzalez and Dunson 1989c). However, 3 pieces of evidence (summarized in Table 2) indicate that E. gloriosus is not as acid-tolerant as the specialist, E. obesus.…”

Section: Physiologymentioning

confidence: 99%

Does water pH control habitat segregation of sibling species of sunfish (Enneacanthus)?

Gonzalez

Dunson

1991

Wetlands

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Enneacanthus obesus and E. gloriosus, sibling centrarchids, are genetically distinct, but morphologically alike. They both inhabit dense vegetation where they glean invertebrates. Their geographic distributions overlap as well, yet there are marked differences in their local distributions. A review of the physiological and distributional evidence strongly suggests that water pH plays a key role in the observed habitat segregation.Physiological data indicate that E. obesus possesses a number of specializations that allow it to regulate sodium even at extremely low pH. While E. gloriosus demonstrated striking acid tolerance, it was clearly not as tolerant as E. obesus. Sodium efflux, body sodium levels, and rate of growth ofE. gtoriosus were negatively affected below pH 4.5, but E. obesus was unaffected until below pH 4.0. Distributional data show that E. obesus is a specialist for acidic waters, whereas E. gloriosus is a habitat generalist. In New Jersey, for example, the distribution of E. obesus is restricted to the acidic waters of the Pine Barrens, while E. gIoriosus is considered peripheral to the Pine Barrens and has a widespread distribution throughout the rest of New Jersey. The data further suggest that water pH acts asymmetrically on the competitive abilities of these 2 species. Enneacanthus gloriosus seems to avoid waters where it would be sublethally stressed by low pH (pH<4.5). We suggest that it may be indirectly excluded from these habitats by E. obesus, which is unaffected at these pHs,

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Differences in low pH tolerance among closely related sunfish of the genus Enneacanthus

Cited by 21 publications

References 18 publications

Competition, pH, and the Ecology of Larval Hyla Andersonii

Competition, pH, and the Ecology of Larval Hyla Andersonii

Distribution, Habitat Characterization, and Aspects of Reproduction of a Peripheral Population of Bluespotted SunfishEnneacanthus gloriosus(Holbrook)

Does water pH control habitat segregation of sibling species of sunfish (Enneacanthus)?

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