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Tucson Basin Validation Site Report, J. L. Thames

Memorandum

No abstract provided.

Rock Valley Validation Site Report, F. B. Turner

Memorandum

No abstract provided.

Curlew Valley Validation Site Report, J. A. Macmahon

Memorandum

No abstract provided.

Factors Contributing To Production And Distribution Of Chihuahuan Desert Annuals, P. D. Whitson

Memorandum

No abstract provided.

Phenology And Function Of Sonoran Desert Annuals In Relation To Environmental Changes, D. T. Patten, W. L. Mckenzie

Memorandum

No abstract provided.

Primary Production And Carbon Allocation In Creosotebush: The Effect Of Carbohydrate Levels On Dark Co2 Release, G. L. Cunningham, J. P. Syvertsen

Memorandum

No abstract provided.

The Impact Of Seed Consumers In A Desert Ecosystem, M. Bryant, D. J. Depree, S. Dick-Peddie, P. Hamilton, W. G. Whitford

Memorandum

No abstract provided.

Plant Food Preferences Of Two Sympatric Rodents And Their Potential Impact On A Great Basin Shrub Community, E. L. Becker Ii, D. F. Balph

Memorandum

No abstract provided.

Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman

Memorandum

No abstract provided.

Rodent Seed-Foraging Strategies And Competition With Ants In The Sonoran Desert, J. H. Brown, D. W. Davidson

Memorandum

No abstract provided.

Distribution Of Microorganisms In Desert Soil, A. T. Vollmer, S. A. Bamberg

Memorandum

No abstract provided.

Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, P. L. Comanor

Memorandum

No abstract provided.

Measurements Of Carbon And Nitrogen Changes In A Desert Soil, E. E. Staffeldt, K. B. Vogt

Memorandum

No abstract provided.

Nitrogen Transformations In Rock Valley And Adjacent Areas Of The Mohave Desert, R. B. Hunter, A. Wallace, E. M. Romney

Memorandum

No abstract provided.

Nitrogen Retention In Cool Desert Soils, J. J. Skujins

Memorandum

No abstract provided.

Plant Growth And Water Transfer Interactive Processes Under Desert Conditions, D. D. Evans, T. W. Sammis, J. Ben Asher

Memorandum

No abstract provided.

Evaluation Of Critical Soil Properties Needed To Predict Soil Water Flow Under Desert Conditions, W. A. Jury, L. H. Stolzy, J. Letey Jr., L. V. Weeks

Memorandum

No abstract provided.

Endoparasitic Nematodes Of Ips Bark Beetles In Eastern Texas, Jack E. Coster, William Hoffard

Faculty Publications

East Texas Ips species contained 4 specific internal nematodes; I. avulsus (Eichhoff) were infected with Parasitylenchus avulsi Massey, I. grandicollis (Eichhoff) with Contortylenchus grandicolli (Massey) Rlihm, and I. calligraphus (Germar) with Contortylenchus elongatus (Massey) Nickle and Parasitaphelenchus sp. In all 3 bark beetles, infection peaked in July and August when 50-58% of adults from naturally attacked pine trees contained nematodes. Infection levels declined to 20-30% during January and February. Infected I. grandicollis and I. avulsus adults appeared lighter in color than noninfected adults. Nematode infection apparently delayed emergence of both sexes of I. grandicollis and females of I. avulsus. In …

Iowa Academy Of Science Leadership Directory, 1976-77, Iowa Academy Of Science

Iowa Academy of Science Documents

Contents:

Officers and Directors ... 2
Section Chairpersons ... 3
Standing Committees ... 6
Special Committee ... 14

Investigations Of The Ichthyofauna Of Nicaraguan Lakes: Frontmatter

Investigations of the Ichthyofauna of Nicaraguan Lakes

Dedication
Commentary on this Compendium
Preface
Acknowledgments
Contributors
Contents

Chemical Analyses Of Some Crater Lakes In Relation To Adjacent Lake Nicaragua, George W. Barlow, Jeffrey R. Baylis, Dale Roberts

Investigations of the Ichthyofauna of Nicaraguan Lakes

In spite of the wide interest by naturalists in the Great Lakes of Nicaragua their limnology has received little study. Cole (1976) has reviewed the literature and contributed new data and interpretations. Our paper adds to his larger work by presenting chemical analyses of Lake Nicaragua and some of the small crater lakes near it. These smaller lakes have been neglected. The only information published about them is a fragmentary table in Riedel (1964), giving some comparative data on surface area, circumference, and depth.

Species Diversity And Distribution Of Fish In Lake Nicaragua, Kurt W. Koenig, Richard J. Beatty, Sergio Martinez C.

Investigations of the Ichthyofauna of Nicaraguan Lakes

The results of a preliminary study of the abundance, diversity and distribution of some of the fish species in Lake Nicaragua are presented here. These parameters have received little attention from investigators working on the lake.
A frequently used measure of species diversity is the Shannon-Weiner diversity index. It measures the degree of uncertainty of predicting the species identity of a randomly selected individual (Pielou, 1966). Lloyd and Ghelardi (1964) indicated that species diversity indices are influenced by both the species number, or "richness", and the species "evenness", or relative number of individuals of a species in a given habitat. …

Pigments Of A Color Polymorphism In A Cichlid Fish, Robert Webber, George W. Barlow, Alan H. Brush

Investigations of the Ichthyofauna of Nicaraguan Lakes

1. Cichlasoma citrinellum occurs as gray or gold morphs in lakes in Nicaragua. The gold morph is variable and individuals range from yellow to dark orange.
2. The pigments responsible for the carotenoid coloration are E-carotene and canthaxanthin. The gray morph contains a carotenoid component and also heavy melanin deposits.
3. The carotenoids are dietary in origin, but their distribution and intensity is presumably under genetic control.
4. The relation of color morphs to the ecological and selective forces which might produce them is discussed.

Parental Behavior And Some Histological Features Of Scales In Cichlasoma Citrinellum (Pisces, Cichlidae), David L. G. Noakes

Investigations of the Ichthyofauna of Nicaraguan Lakes

We have described elsewhere the ontogeny of behavior of young Cichlasoma citrinelium, and some aspects of the behavior of the parents during the corresponding period (Noakes and Barlow 1968, 1973a, 1973b). Adults are polymorphic in body color, the "normal" color being grey; the "gold" morphs are more or less xanthic and lack the species typical dark markings (Barlow 1973; and in preparation). The young have a characteristic behavior directed toward the parents in both the laboratory and the field. About 4 days after the young become free-swimming, they begin to feed from the body surfaces …

Limnology Of The Great Lakes Of Nicaragua, Gerald A. Cole

Investigations of the Ichthyofauna of Nicaraguan Lakes

For more than a century, the two largest bodies of water in Nicaragua, Lake Nicaragua and its smaller companion, Managua, have engaged naturalists from several disciplines. Perhaps their appeal has been as curiosities because of the occurrence of fish with marine affinities in the larger lake, especially a dangerous shark. The charm has been in Nicaragua or Cocibolca, rather than Managua, properly called Xolotlán. Even though the latter is saltier, it has no elasmobranchs or tarpons.
The lakes, and specifically the larger, cover the greatest expanse of any body of water between Lake Titicaca, Bolivia-Peru, and the Laurentian …

The Status Of The Lake Nicaragua Shark: An Updated Appraisal, Thomas B. Thorson

Investigations of the Ichthyofauna of Nicaraguan Lakes

Since 1966, an extensive tagging program has demonstrated beyond any further doubt (Thorson, 1971) that the sharks move from the Caribbean Sea to Lake Nicaragua and vice versa. At the time of this writing, of 1450 post-juvenile sharks tagged at the various river mouths on the Caribbean Coast, ten have been recovered in Lake Nicaragua; and of 146 tagged at San Carlos, where the river leaves the lake, 28 have been recovered along the Caribbean Coast, most of them at the various outlets of the Rio San Juan. Except for these basic facts, the results of the tagging program have …

The Midas Cichlid In Nicaragua, George W. Barlow

Investigations of the Ichthyofauna of Nicaraguan Lakes

Cichlasoma citrinellum (Gunther), the Midas cichlid, is the most important food fish in the Great Lakes Basin of Nicaragua. It occurs in the majority of the lakes, where it is the most ubiquitous cichlid fish, but it is uncommon in the rivers. The fry are carnivorous while the juveniles and adults are omnivorous, eating mostly Aufwuchs, snails, and fish. The Midas cichlids suffer from a number of diseases in nature and in the laboratory, including lymphocystis and nocardiosis. Potential predators vary from sharks and sawfish in Lake Nicaragua, to just one cichlid relative in one crater lake; in Lake …

Presence Of The Cichlid Fish Cichlasoma Managuense Gunther In Lake Xiloá, Nicaragua, Jime Villa

Investigations of the Ichthyofauna of Nicaraguan Lakes

Villa (1968) included C. managuense in the fauna of Lake Xiloá as a "recently introduced" species since the Ministerio de Agricultura y Ganaderia (Nicaragua) had introduced several hundred young individuals of this species from Lake Managua, hatched at the Estacion Experimental "La Calera." Apparently officials of the Ministerio did not determine whether or not C. managuense occurred in Lake Xiloá prior to its introduction.

Body Fluid Solutes Of Juveniles And Adults Of The Euryhaline Bull Shark Carcharhinus Leucas From Freshwater And Saline Environments, Thomas B. Thorson, C. Michael Cowan, Donald E. Watson

Investigations of the Ichthyofauna of Nicaraguan Lakes

Since the discovery of the phenomenally high urea content of the body fluids of cartilaginous fishes by Staedeler and Frerichs (1858), the unique osmoregulatory system of this vertebrate class has been studied by many investigators. In broad outline, the mechanisms are essentially similar in all three of the major subtaxa: the selachians, the batoids, and the holocephalans. A single exception is the genus Potamotrygon (fresh-water stingrays of South America and Africa), which has apparently lost the ability to concentrate urea even when transferred to salt water.

Observations On The Reproduction Of The Sawfish, Pristis Perotteti, In Lake Nicaragua, With Recommendations For Its Conservation, Thomas B. Thorson

Investigations of the Ichthyofauna of Nicaraguan Lakes

The presently known pristiform fauna of the western Atlantic consists of only two species, one each of Fowler's (1941) subgenera, Pristis and Pristiopsis. The former, characterized by the absence of a subcaudal lobe on the caudal fin, is represented by Pristis pectinatus; the latter, in which the subcaudal lobe is present, by Pristis perotteti. Although several features readily separate the two species, they can most easily be distinguished by the more slender rostrum of P. pectinatus and its larger number of rostral teeth, 24 to 32 on each side, as compared with 14 to 20 in …