Reproductive phenology of the subtropical seagrasses Thalassia testudinum (turtle grass) and Halodule wrightii (shoal grass) in the northwest Gulf of Mexico

2016 ◽  
Vol 59 (6) ◽  
Author(s):  
Kelly M. Darnell ◽  
Kenneth H. Dunton
Keyword(s):  
Gulf Of Mexico ◽  
Life Histories ◽  
Thalassia Testudinum ◽  
Individual Species ◽  
Reproductive Phenology ◽  
Halodule Wrightii ◽  
Complete Understanding ◽  
Successful Management ◽  
Turtle Grass ◽  
Seagrass Cover

Abstract Seagrass cover is declining worldwide, and successful management, conservation and restoration require a complete understanding of individual species’ life histories. The historically undervalued importance of sexual reproduction in seagrass population dynamics has prompted investigations of reproductive phenology and output. Here, we present the results of a multi-year study examining the reproductive phenology and output of two dominant seagrass species in the northwest Gulf of Mexico,

Isotopic characterization of lifetime movement by two demersal fishes from the northeastern Gulf of Mexico

2021 ◽  
Vol 657 ◽  
pp. 161-172
Author(s):  
JL Vecchio ◽  
JL Ostroff ◽  
EB Peebles
Keyword(s):  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Life Histories ◽  
Linear Mixed Model ◽  
Trophic Position ◽  
Eye Lens ◽  
Outer Continental Shelf ◽  
Red Grouper ◽  
Lens Diameter ◽  
Isotopic Characterization

An understanding of lifetime trophic changes and ontogenetic habitat shifts is essential to the preservation of marine fish species. We used carbon and nitrogen stable isotope values (δ13C and δ15N) recorded within the laminar structure of fish eye lenses, reflecting both diet and location over time, to compare the lifetime trends of 2 demersal mesopredators. Tilefish Lopholatilus chamaeleonticeps inhabit burrows on the outer continental shelf, which results in exceptional site fidelity. Red grouper Epinephelus morio are spawned on the middle to outer continental shelf, move to the inner shelf for the juvenile period, and return offshore upon sexual maturity. Both species inhabit the eastern Gulf of Mexico, a region with a distinctive offshore-inshore gradient in background δ13C values. Within individual tilefish (n = 36), sequences of δ13C values and δ15N values had strong, positive correlations with eye-lens diameter, and strong correlations between the 2 isotopes (mean Spearman r = 0.86), reflecting an increase in trophic position with growth and little lifetime movement. In red grouper (n = 30), δ15N values positively correlated with eye-lens diameter, but correlations between δ15N and δ13C were weak (mean Spearman r = 0.29), suggesting cross-shelf ontogenetic movements. Linear mixed model results indicated strong relationships between δ15N and δ13C values in tilefish eye lenses but no convergence in the red grouper model. Collectively, these results are consistent with previously established differences in the life histories of the 2 species, demonstrating the potential utility of eye-lens isotope records, particularly for investigating the life histories of lesser-known species.

Characterizing the Potential Habitat of Ichthyoplankton in the Gulf of Mexico for Species with Contrasting Life Histories

2020 ◽  
Author(s):  
Gonzalo Daudén Bengoa ◽  
Laura Echeverri García ◽  
Sylvia Jiménez-Rosenberg ◽  
Sharon Herzka
Keyword(s):  
Gulf Of Mexico ◽  
Life Histories ◽  
Potential Habitat

Clonal diversity and connectedness of turtle grass (Thalassia testudinum) populations in a UNESCO Biosphere Reserve

2015 ◽  
Vol 123 ◽  
pp. 76-82 ◽  
Author(s):  
James J. Campanella ◽  
Paul A.X. Bologna ◽  
Maria Carvalho ◽  
John V. Smalley ◽  
Mohamedhakim Elakhrass ◽  
...  
Keyword(s):  
Biosphere Reserve ◽  
Clonal Diversity ◽  
Thalassia Testudinum ◽  
Turtle Grass

Decomposition and nitrogen dynamics of turtle grass (Thalassia testudinum) in a subtropical estuarine system

2017 ◽  
Vol 25 (6) ◽  
pp. 667-681 ◽  
Author(s):  
Monica Delgado ◽  
Carlos E. Cintra-Buenrostro ◽  
Alejandro Fierro-Cabo
Keyword(s):  
Thalassia Testudinum ◽  
Nitrogen Dynamics ◽  
Estuarine System ◽  
Turtle Grass

scholarly journals Reproductive phenology of the American Bullfrog in subtropical Brazil: photoperiod as a main determinant of seasonal activity

2016 ◽  
Vol 88 (3 suppl) ◽  
pp. 1909-1921 ◽  
Author(s):  
CAMILA I. MEDEIROS ◽  
CAMILA BOTH ◽  
IGOR L. KAEFER ◽  
SONIA Z. CECHIN
Keyword(s):  
Life Histories ◽  
Management Strategies ◽  
Reproductive Activity ◽  
Ex Situ ◽  
Reproductive Phenology ◽  
High Fertility ◽  
Seasonal Activity ◽  
Population Declines ◽  
American Bullfrog ◽  
The North

ABSTRACT The North American bullfrog Lithobates catesbeianus continues to invade ecosystems worldwide, potentially causing population declines and even extinctions. Within its native distribution, bullfrogs show prolonged reproductive seasons and high fertility. However, data on breeding biology of bullfrogs ex-situ in invaded localities mainly comes from anecdotal reports. Understanding how invasive species are adjusting their life histories to new colonized environments is important for conservation purposes. Here we describe temporal and spatial abundance, calling activity, spawning and tadpole distribution of bullfrogs in southern Brazil. Eighteen samplings occurred during one year. The abundance of individuals was positively related to longer photoperiods and higher temperatures. Reproductive activity was also positively associated with longer photoperiods. Calling sites, spawning and tadpoles were associated with microhabitats presenting hydrophytes, which may provide shelter and thermal stability to bullfrogs. The reproductive seasonal activity of bullfrogs can be highly variable across its growing geographical range, but in subtropical Brazil it is associated with photoperiod, a highly predictable abiotic determinant. In our study area, bullfrogs presented a breeding season twice as long as that observed in some native localities. We suggest that management strategies directed to bullfrog populations must consider the habitat structures and seasonal regimes determined by each invaded environment.

Sign in / Sign up

Export Citation Format

Share Document