7787

• UCREFRP Catalog Number: 7787
• Author: Desert Fishes Council.
• Title: Proceedings of the Desert Fishes Council Volume XXV, 1993 Annual Symposium.
• USFW Year: 1993.
• USFW - Doc Type: D. A. Hendrickson, ed. November, 10 -14.
• Copyright Material: NO

ABSTRACTS OF PRESENTATIONS
ZAMUDIO-VALDES% ANDRES; RODRIGUEZ-ALMARAZ, G. Urtwmidad Awn- de Nuevo Leon, Facultad do Ciencias Biokogica,
Laborawio do Arlr6padoa, Apdo. Postal 105-F, Cd. Urniversitaria, San NimW de 1os Garza, N.L., Mdxico
The copepods of Cuatro Cienegas, Coahuila (Crustacea: Copepoda) with notes on
their distributions among distinct habitats and microhabitats
Los copepodos de Cuatro Cienegas, Coahuila (Crustacea: Copepoda) con notas sobre
su distribution en Jos distintos habitats y microhabitats
KEYWORDS: Copepoda; species diversity; Cuatro Cienegas; Coahuila
CLAVES: Cuatro Cidnegas; diversidad de especies; Coahuila; Copepoda
ABSTRACT
A qualitative study was carried out with free-living copepods from Cuatro Cienegas basin, Coahuila, where
different aquatic habitats and microhabitats were surveyed at 23 localities. The collections were made every six
weeks throughout a year. Nine species of cyclopoids, six harpactacoids and one calanoid were found; five species
are new records for Mexico. Jaccard's similarity index revealed the existence of a group of fine eurytopic species.
The linuoocrenes, rivers, streams, marshes and shallow lakes had the greatest diversity of species. Rheocrenes and
ephemeral ponds had low species richness. It is believed that these last habitats have little microhabitat complexity
due to their ephemeral nature or small areas occupied. In the case of the distribution of copepods among
microhabitats it was determined that the greatest numbers of species came from epibenthic areas, aquatic plants and
stromatolites. The scarcity of copepods in open waters of the valley was notable. [Editor's note: English abstract
supplied by authors has been slightly edited by the editor].
RESUMEN
Se realize tin estudio cualitativo de ]as especies de copepodos de vida libre del Valle de Cuatro Cienegas,
Coahuila; donde se revisaron diferentes habitats y microhabitats acuatieos de 23 localidades de esta zona. La colectas
fueron realizadas cada seis semanas durante el transcurso de un afio. se encontraron nueve especies de copepodos
ciclopoides, seis harpacticoides y una de calanoide. Cinco especies son nuevos registros para Mexico. El indite de
similitud de Jaecard revelo la existencia de un grupo de cinco especies, que se consideran euritepicas. Los
limnocrenos, rfos, arroyos, cienegas y lagos someros presentaron la mayor diversidad de especies. Por otra parte,
los reocrenos y charcas efimeras tuvieron poca riqueza de especies. Se considera que estos microhabitats tienen poca
complejidad en relation a la estructura de los microhabitats disponibles, debido a la corta permanencia de sus aquas
o a la pequeiia area que ocupan. En el caso de la distribution de las especies por microhabitat, se determine que
habitan tanto en el epibentos, vegetation acuatica y estromatolitos, ya que sustentan el.mayor ndmero de especies.
Ademas, fue notoria la escasa representation de especies en las aguas abiertas del Valle. [Nota del editor: resumen
en espafiol es de los autooes sin revision por el comite de traducc]en]
SOUS-RO,IAS , CARLOS; RODRIGUEZ-ALIVIARAZ, G. Facullad de Ciencias Biologicas, Laboralorio de Arlr6podos y Ent-logla, Universidad
Au0-- de Nuevo 1c&, Monterrey, N.L., Mcxim
The Arachnids (Chelicerata: Arachnida) of the Valley of Cuatro Cienegas, Coahuila, Mexico
Los Aracnidos (Chelicerata: Arachnida) del Valle de Cuatro Cienegas, Coahuila, Nlexico
KEYWORDS: Arachnids; Cuatro Cidnegas
CLAVES: Aracnidos; Cuatro Cidnegas
ABSTRACT
The arachnids are a very complex group with respect to adaptation to different habitats and microhabitats. The
arachnological fauna of Cuatro Cienegas is poorly known. To add data regarding arachnid distributions collections
were made during 1989 to 1991. Samples included visits to a variety of habitat types based on vegetation. The
orders Scorpionida, Pseudoscorpionida, Solpugida and Aranaea were represented by 19 families. True spiders were
the most diverse group with 24 genera in 14 families. We believe that arachnids play an important role as predators
in maintaining community equilibrium in the valley. [Editor's note: English abstract supplied by authors has been
slightly edited by the editor].
RESUMEN
Los aracnidos es tin grupo muy complejo a sus adaptaciones a los diferentes ambientes disponibles en tin
ecosistema. La fauna aracnologica es poca conocida en Cuatro Cienegas, Coahuila. Para aportar datos de
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