Porifera. Thomas M. Frost Trout Lake Station Center for Limnology University of Wisconsin Madison, Wisconsin '"'. , ' I.
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1 , ' Porifera Thomas M. Frost Trout Lake Station Center for Limnology University of Wisconsin Madison, Wisconsin '"'. Chapter Outline I. INTRODUCTION II. ANATOMY AND PHYSIOLOGY A. External Morphology B. Internal Anatomy and Physiology 1. Water Processing 2. Digestion 3. Skeleton 4. Reproduction III. ECOLOGY AND EVOLUTION A. Diversity and Distribution 1. Diversity 2. Distribution B. Reproduction and Life History 1. Dormancy 2. Growth, Sexual Reproduction, and Dispersal within Habitats 3. Dispersal among Habitats C. Ecologic Interactions 1. Availability of Substrata 2. Nutritional Ecology 3. Biotic Interactions 4. Functional Role in Ecosystems 5. Paleolimnology D. Evolutionary Relationships IV. COLLECTION, CULTURE, AND PREPARATION FOR IDENTIFICATION V. CLASSIFICATION A. Taxonomic Key to Species of Freshwater Porifera B. Descriptions of Freshwater Sponge Species in Canada and the United States Literature Cited James H. Thorp and Alan P. Covich (Editors), 911 PP Ecology and Classification of North American Freshwater Invertebrates Copyright 1991 by Academic Press, Inc. All rights of reproduction in any form reserved. I. INTRODUCTION The presence of sponges in freshwater comes as a surprise to many who think that the members of the phylum Porifera dwell only in the ocean. Yet sponges are common and sometimes abundant inhabitants of a broad diversity of freshwater communities. In some habitats they comprise a major component of the benthic fauna and may play important roles in ecosystem processes. Sponges are the simplest of the multicellular phyla. Lacking organs, their highest degree of organization is at the tissue level, and specialized cells accomplish many basic biological functions. Despite their simplicity, however, sponges display a variety of elegant adaptations to freshwater habitats including complex life cycles, a capacity to feed selectively on a broad range of particulate resources, and, in most species, an intimate association with algal symbionts. This chapter will introduce the structure, function, and diversity of freshwater sponges with an emphasis on their basic ecology. For those whose interests are whetted by this introduction, Berquist (1978) and Simpson (1984) provide detailed summaries on the biology of the phylum in general. Within the zoological community, there has been substantial debate whether sponges should be treated as colonies or individuals (Hartman and Reiswig 1973, Simpson 1973). This conflict hinges on whether a particular, continuous growth of sponge tissue should be considered to either function as a single unit or as a set of units that function independently. To an ecologist, the critical element of this debate involves the capability of sponges to continue growth after they have been separated into pieces from an originally intact body. In some large marine species that exhibit body forms suggesting a single, integrated unit, only intact sponges can survive. In many other species, however, sponges can be broken down into components that can function 95
2 96 T. Frost independently when they are separated. This is the case for freshwater sponges, which can be separated into large numbers of independently growing units (Frost et al. 1982). As such, freshwater sponges, as well as most marine sponges (Jackson 1977) can be considered functionally as colonial organisms. Simply stated, sponges are much more like corals or bryozoans in terms of the ecological function of their growth form than they are like arthropods or vertebrates. From an ecological perspective, the "colony versus individual" debate for sponges can be traced to attempts to apply concepts derived from metazoans to sponges, where, because of their level of organization, such concepts are not appropriate. II. ANATOMY AND PHYSIOLOGY There is a striking contrast between the simplicity of the external features of a sponge and the complexity of its internal structure and function. Viewed macroscopically, freshwater sponges exhibit a limited range of body forms, but a microscopic examination reveals a variety of internal features. This contrast derives from the basic organization of sponges, in which tissues rather than organs represent the highest level of morphological complexity. In fact, specialized cells, operating independently or in association with related cells, accomplish such primary functions as food gathering, digestion, and reproduction. An appreciation of sponge structure, therefore, is possible only from microscopic examinations. Likewise, it is difficult to discuss the physiological functions of sponges independent of their microscopic structure and these topics are presented jointly, in a general overview. A. External Morphology Freshwater sponges display a variety of morphologies which range from encrusting (Fig. 4.1) to rounded (Fig. 4.2) to fingerlike (Fig. 4.3) growth forms. Because these forms can vary substantially within a species (Penney and Racek 1968), general morphology is of little use in sponge taxonomy. Variation in growth form is influenced by environ- " Figure 4.1 Gemmulated colonies of Spong ilia lacustris and Eunapius mackayi exhibiting an encrusted growth form. The distinct zone between the two species illustrates the typical nonmerging front that occurs when two different freshwater species grow into contact with each other on a substratum.
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