Biogeography and biodiversity of western Atlantic mollusks


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Smithsonian Libraries. Share Icon. Contents Ch. The molluscan provincial concept in the tropical western Atlantic -- ch. Provinces of the tropical western Atlantic -- ch. Molluscan biodiversity in the Georgian subprovince -- ch. Detailing three marine molluscan faunal provinces Carolinian, Caribbean, and Brazilian , this volume examines the distribution and evolutionary patterns of the marine mollusks of the tropical and subtropical regions of the western Atlantic Ocean.

Shallow water marine molluscan faunas are distributed in a pattern of distinct, geographically definable areas.

INTRODUCTION

This makes mollusks ideal for studying the distribution of organisms in the marine environment and the processes and patterns that control their evolution. Biogeography and Biodiversity of Western Atlantic Mollusks is the first book to use quantitative methodologies to define marine molluscan biogeographical patterns. It traces the historical development of these patterns for the subtropical and tropical western Atlantic. The book discusses the multistage process of evolving new taxa caused by eustatic fluctuations, ecological stress, and evolutionary selection. The faunal provinces-Carolinian, Caribbean, and Brazilian-are discussed in detail.

The text defines the physical aspects of the provinces using quantitative data, with water temperature as the primary parameter. It discusses the details of the 15 subprovinces-geographically definable faunal subdivisions-as well as provinciatones, transition zones of provincial overlap.


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The author's algorithms demonstrate that the bulk of the molluscan biodiversity is concentrated in 40 separate centers of speciation, ranging from Cape Hatteras, North Carolina, south to Argentina. Many of these evolutionary hotspots reside on remote archipelagos and offshore banks as well as within areas of provincial overlap. The text describes some of the more exotic and poorly known areas and presents maps and color photographs of characteristic habitats, index species, and live animals, including over species of rare and seldom seen shells. The faunal provinces Carolinian, Caribbean, and Brazilian are discussed in detail.

Kundrecensioner

It discusses the details of the 15 subprovinces geographically definable faunal subdivisions as well as provinciatones, transition zones of provincial overlap. The author s algorithms demonstrate that the bulk of the molluscan biodiversity is concentrated in 40 separate centers of speciation, ranging from Cape Hatteras, North Carolina, south to Argentina.

The book's color plates make it a highly desirable resource for marine biologists and malacologists. Foreword p. All Rights Reserved.

Marine Biodiversity in the Atlantic and Pacific Coasts of South America: Knowledge and Gaps

This information is provided by a service that aggregates data from review sources and other sources that are often consulted by libraries, and readers. The University does not edit this information and merely includes it as a convenience for users. It does not warrant that reviews are accurate. The micro-speciation phenomenon is particularly evident in groups with non-planktotrophic development Ornelas-Gatdula et al.

These authors pointed out the existence of genetically distinct clades in this subprovince for some groups of molluscs, despite the general faunal homogeneity of the Caribbean. In addition, it seems common in certain families of heterobranchs to observe a distribution pattern comprising an endemic species from the Bahamas that is sister to a widespread western Atlantic species living in the same kind of habitat, suggesting an allopatric speciation process Carmona et al.

In the latest morphological and molecular phylogeny of the genus provided by Carmona et al. The abnormal speciation pattern of both species led Carmona et al. The only specimen of S. Order Nudibranchia Cuvier, Family Aeolidiidae Gray, Genus Spurilla Bergh Spurilla dupontae Carmona et al. Body elongate, tapering abruptly to the posterior end, translucent white to yellowish-brown, with an ochre to brownish-green reticulate pattern and white spots all over the dorsum and cerata Fig. Rhinophores, oral tentacles and foot corners bearing the same reticulate pattern as the rest of the body.

Biodiversity and nature endangered on the planet

Anterior foot corners tentaculiform. Rhinophores perfoliate, with a white apex, bearing 9—12 lamellae.

A review of Biogeography and biodiversity of western Atlantic ...

Oral tentacles long and slender. Cerata cylindrical, curved inwards, shorter than the rhinophores, arranged in five arches from behind the rhinophores to the posterior end. Each arch contains between three and seven cerata, decreasing in size towards the foot. Anus within the second right arch.

Gonopore among the cerata of the group on the right. Carmona et al. These authors also established the distribution of the western Atlantic species: S. In this context, it seemed logical to assume that S.

Biogeographic and species richness patterns of Gastropoda on the southwestern Atlantic

But the specimen of S. Since its original description, there has not been any records to S. This specimen from the southern end of the Caribbean, was collected on Caulerpa spp. On the other hand, the Guadeloupe Archipelago is very close to Martinique, and nearer to the Bahamas. However, S. It has been stated that the Bahamas and the Turks and Caicos Islands are a special region in the western Atlantic, largely isolated from the Caribbean, except for minor exchange from the north coast of Cuba and Haiti Cowen et al.

Marine biogeographic realms and species endemicity

The presence of S. In synthesis, further collections of S. Bergh R. Anatomiske bidrag til kundskab om Aeolidierne. Caballer M, Ortea J.

Biogeography and biodiversity of western Atlantic mollusks Biogeography and biodiversity of western Atlantic mollusks
Biogeography and biodiversity of western Atlantic mollusks Biogeography and biodiversity of western Atlantic mollusks
Biogeography and biodiversity of western Atlantic mollusks Biogeography and biodiversity of western Atlantic mollusks
Biogeography and biodiversity of western Atlantic mollusks Biogeography and biodiversity of western Atlantic mollusks
Biogeography and biodiversity of western Atlantic mollusks Biogeography and biodiversity of western Atlantic mollusks

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