scholarly journals OXYGEN-HEMOCYANIN RELATIONSHIPS IN THE LAND CRAB, CARDISOMA GUANHUMI

1962 ◽  
Vol 122 (2) ◽  
pp. 252-262 ◽  
Author(s):  
JAMES R. REDMOND
Keyword(s):  
Land Crab ◽  
Cardisoma Guanhumi

Heart Rate and Hemolymph Pressure Responses to Hemolymph Volume Changes in the Land Crab Cardisoma guanhumi: Evidence for "Baroreflex" Regulation

1990 ◽  
Vol 63 (1) ◽  
pp. 167-181 ◽  
Author(s):  
Warren Burggren ◽  
Alan Pinder ◽  
Brian McMahon ◽  
Michael Doyle ◽  
Michele Wheatly
Keyword(s):  
Heart Rate ◽  
Volume Changes ◽  
Land Crab ◽  
Cardisoma Guanhumi ◽  
Hemolymph Volume

MORPHOMETRY OF BLUE LAND CRAB (CARDISOMA GUANHUMI) BURROWS: ICHNOLOGICAL CONTEXT AND PALEOENVIRONMENTAL IMPLICATIONS

Palaios ◽  
2020 ◽  
Vol 35 (11) ◽  
pp. 461-469
Author(s):  
CHRISTOPHER A. SPARACIO ◽  
ILYA V. BUYNEVICH ◽  
H. ALLEN CURRAN ◽  
KAREN KOPCZNSKI
Keyword(s):  
Similarity Index ◽  
Keystone Species ◽  
Morphometric Parameter ◽  
Paleoenvironmental Reconstruction ◽  
Level Indicator ◽  
Land Crab ◽  
San Salvador ◽  
Cardisoma Guanhumi ◽  
San Salvador Island ◽  
Blue Land Crab

ABSTRACT A large brachyuran, the blue land crab (Cardisoma guanhumiLatreille, 1825) is a keystone species and a prolific burrower in a variety of low-latitude supratidal habitats; however, few studies have addressed its ichnological aspects. Here we present a detailed morphological assessment of C. guanhumi burrows and make comparisons to Macanopsis plataniformis, a trace fossil thought to be constructed by a similar brachyuran. Using nine burrow casts from a mangrove wetland on San Salvador Island, Bahamas, 29 dimensionless morphometric parameters were compared. Results of Bray-Curtis tests show high overall similarity index (0.85) between casts, with complexity, tortuosity, and opening inclination angle having moderate to high similarity (> 0.8). End chamber angle of the blue land crab has highest similarity both within the modern morphometric parameter dataset (> 0.9) and to that of M. plataniformis (0.88). The large terminal chamber is particularly important because of its high preservation potential, as a repository for organic remains, and as a reliable water table (∼ sea-level) indicator. Cluster analysis suggests size-independent Macanopsis-resembling burrow morphology among different extant taxa can be discriminated via quantitative neoichnological methods. Our findings demonstrate how a quantitative assessment of modern burrows and their likely counterparts from the sedimentary record can help constrain tracemaker identity and aid paleoenvironmental reconstruction of low-energy microtidal settings.

Effects of land-use/land-cover changes on land crab,Cardisoma guanhumi, abundance in Puerto Rico

2008 ◽  
Vol 24 (4) ◽  
pp. 417-423 ◽  
Author(s):  
Yogani Govender ◽  
Alberto M. Sabat ◽  
Elvira Cuevas
Keyword(s):  
Land Use ◽  
Puerto Rico ◽  
Land Cover ◽  
Soil Temperature ◽  
Surface Soil ◽  
Negative Relationship ◽  
Land Use Land Cover ◽  
Land Crab ◽  
Cardisoma Guanhumi ◽  
Crab Abundance

AbstractThe land crabCardisoma guanhumipopulations have been on the decline in Puerto Rico for the last three decades. While some studies suggest overexploitation and pesticides as causing the observed population declines, the effect of land-use/land-cover (LULC) changes have not been investigated. In this study we compared the abundance and size ofCardisoma guanhumiin five different LULC types (mangroves, grasslands, forest, urban and industrial), and investigated the relationship between differences in physical microhabitat conditions among the LULC types with crab abundance and size. Although no significant differences in size were found among the different LULC types, crabs were significantly less abundant in grassland sites. Surface soil temperature, depth to groundwater and air temperature were found to vary significantly among the LULC types. Of these, only surface soil temperatures had a significant negative relationship with crab abundance. It appears that high variation in soil temperature and a high groundwater table observed in the grasslands is most detrimental to crabs. Interestingly, during the time when land crab populations declined there was corresponding change of LULC from agriculture to grasslands.Cardisoma guanhumiis resilient to changes in LULC, however, changes that alter their access to groundwater and escape from high soil temperature reduce their habitat.

Reproductive biology of the land crab Cardisoma guanhumi (Decapoda: Gecarcinidae) in north-eastern Brazil

2012 ◽  
Vol 93 (3) ◽  
pp. 761-768 ◽  
Author(s):  
Renata Akemi Shinozaki-Mendes ◽  
José Roberto Feitosa Silva ◽  
Jones Santander-Neto ◽  
Fábio Hissa Vieira Hazin
Keyword(s):  
Sexual Maturity ◽  
Histological Analysis ◽  
Carapace Width ◽  
Gonadal Maturation ◽  
Land Crab ◽  
Eastern Brazil ◽  
North Eastern ◽  
Cardisoma Guanhumi ◽  
Maturation Stages ◽  
First Maturity

The reproductive cycle of Cardisoma guanhumi was described from the analysis of seasonal variation of the gonadal maturation stages. The first maturity for both sexes was determined based on three different tests: inflexion point on the curve; relevant character (morphometry); and histological analysis (physiology). In addition, some aspects of sexual dimorphism for the population were studied. A total of 353 individuals caught in north-eastern Brazil between December 2006 and November 2007 were analysed. The sex-ratio was statistically equal (P ≥ 0.05) and the carapace width (CW) of the females ranged from 4.34 to 8.56 cm and of the males from 2.84 to 9.22 cm. Mature females with fully developed gonads begin to appear in the dry season (August) and ovigerous females occurred from November to February, suggesting that spawning occurs mainly during the rainy season. The CW of first sexual maturity for females ranged from 5.87 cm to 6.70 cm and males from 6.22 cm to 7.20 cm. The highest percentage of individuals caught were juveniles, indicating the need for a targeted effort to preserve the species.

Nitrogen Limitation in the Herbivorous Land Crab Cardisoma guanhumi

1987 ◽  
Vol 60 (2) ◽  
pp. 262-268 ◽  
Author(s):  
D. L. Wolcott ◽  
T. G. Wolcott
Keyword(s):  
Nitrogen Limitation ◽  
Land Crab ◽  
Cardisoma Guanhumi
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